阅读说明：本技术 用于三相电机的转向控制系统 (Steering control system for three-phase motor ) 是由 洪银树 尹佐国 王俊琪 于 2018-07-19 设计创作，主要内容包括：本发明提供一种用于三相电机的转向控制系统。该转向控制系统包括：一组三相电机线圈、一组三相感应电路、一控制电路及一控制开关组。该三相感应电路用以感应一转子的位置。该控制电路用以提供三相线圈信号及接收三相感应信号,该三相线圈信号用以提供信号至该三相电机线圈,该三相感应信号来自该三相感应电路。该控制开关组用以同时切换控制该三相线圈信号至该三相电机线圈,及来自该三相感应电路的该三相感应信号,以控制该三相电机的转向。因此,利用该控制开关组同时切换控制该三相线圈信号及该三相感应信号,以正确地感应该转子的位置,该控制电路无需再进行任何电路的变更设计或程序的修改,可节省设计及元件成本,且降低元件维修的复杂度。(The invention provides a steering control system for a three-phase motor. The steering control system includes: a set of three-phase motor coils, a set of three-phase induction circuit, a control circuit and a control switch set. The three-phase induction circuit is used for inducing the position of a rotor. The control circuit is used for providing a three-phase coil signal and receiving a three-phase induction signal, the three-phase coil signal is used for providing a signal to the three-phase motor coil, and the three-phase induction signal comes from the three-phase induction circuit. The control switch set is used for simultaneously switching and controlling the three-phase coil signal to the three-phase motor coil and the three-phase induction signal from the three-phase induction circuit so as to control the steering of the three-phase motor. Therefore, the control switch group is used for simultaneously switching and controlling the three-phase coil signal and the three-phase induction signal so as to correctly induce the position of the rotor, the control circuit does not need to carry out any circuit change design or program modification, the design and element cost can be saved, and the element maintenance complexity is reduced.)

1. A steering control system for a three-phase motor, comprising:

a group of three-phase motor coils comprising a first coil, a second coil and a third coil;

a set of three-phase induction circuits, including a first induction circuit, a second induction circuit and a third induction circuit, the three-phase induction circuit is used for inducing the position of a rotor;

a control circuit for providing three-phase coil signals for providing signals to the three-phase motor coils and receiving three-phase induction signals from the three-phase induction circuit; and

and the control switch group is used for simultaneously switching and controlling the three-phase coil signal to the three-phase motor coil and the three-phase induction signal from the three-phase induction circuit so as to control the steering of the three-phase motor.

2. The steering control system for a three-phase motor according to claim 1, wherein the control switch group simultaneously switches and controls the phases of two of the three-phase coil signals to the three-phase motor coils and the phases of two of the three-phase induction signals from the three-phase induction circuit.

3. A steering control system for a three-phase motor according to claim 2, wherein the three-phase coil signal includes: a first phase coil signal, a second phase coil signal, a third phase coil signal, the three phase induced signal comprising: a first phase induction signal, a second phase induction signal, and a third phase induction signal.

4. A steering control system for a three-phase motor according to claim 3, wherein the first coil includes a first control terminal, the second coil includes a second control terminal, and the third coil includes a third control terminal; the first sensing circuit comprises a fourth control end, the second sensing circuit comprises a fifth control end, and the third sensing circuit comprises a sixth control end; the control switch group has a connection side and a signal side, the connection side includes a plurality of connection ends respectively electrically connected to two of the first control end, the second control end and the third control end, and two of the fourth control end, the fifth control end and the sixth control end corresponding to the phases, the signal side includes a plurality of signal ends respectively electrically connected to two of the first phase coil signal, the second phase coil signal and the third phase coil signal corresponding to the phases, and two of the first phase induction signal, the second phase induction signal and the third phase induction signal corresponding to the phases, and selectively switches and controls the electrical connection between two of the first phase coil signal, the second phase coil signal and the third phase coil signal corresponding to the phases and two of the first control end, the second control end and the third control end corresponding to the phases according to a steering signal, and simultaneously switching and controlling the electrical connection of two of the first phase induction signal, the second phase induction signal and the third phase induction signal of the corresponding phases with two of the fourth control end, the fifth control end and the sixth control end of the corresponding phases.

5. The steering control system for a three-phase motor according to claim 4, wherein the remaining one of the first phase coil signal, the second phase coil signal, and the third phase coil signal is directly electrically connected to the remaining one of the first control terminal, the second control terminal, and the third control terminal of the corresponding phase; the other one of the first phase induction signal, the second phase induction signal and the third phase induction signal corresponding to the phase is directly and electrically connected with the other one of the fourth control end, the fifth control end and the sixth control end corresponding to the phase.

6. The steering control system for a three-phase motor according to claim 4, wherein the connection side is electrically connected to the first control terminal, the second control terminal, the fourth control terminal and the fifth control terminal, respectively, and the signal side is electrically connected to the first phase coil signal, the second phase coil signal, the first phase induction signal and the second phase induction signal, respectively.

7. The steering control system for a three-phase motor according to claim 6, wherein the steering signal includes a first steering signal and a second steering signal, and the first phase coil signal is switched to be electrically connected to the first control terminal and the second phase coil signal is switched to be electrically connected to the second control terminal according to the first steering signal, and the first phase induction signal is simultaneously switched to be electrically connected to the fourth control terminal and the second phase induction signal is simultaneously switched to be electrically connected to the fifth control terminal.

8. The steering control system for a three-phase motor according to claim 7, wherein the first phase coil signal is switched to be electrically connected to the second control terminal and the second phase coil signal is switched to be electrically connected to the first control terminal according to the second steering signal, and the first phase induction signal is simultaneously switched to be electrically connected to the fifth control terminal and the second phase induction signal is simultaneously switched to be electrically connected to the fourth control terminal.

9. A steering control system for a three-phase electric motor according to claim 8, wherein the steering signal is a signal issued by the control circuit.

10. The steering control system for a three-phase motor according to claim 8, wherein the steering signal is a signal of a manual changeover switch.

11. The steering control system for a three-phase motor according to claim 8, wherein the control switch set includes a first control switch, a second control switch, a third control switch and a fourth control switch, the first control switch includes a first connection end, a second connection end and a first signal end, the first connection end and the second connection end are electrically connected to the first control end and the second control end respectively, and the first signal end is electrically connected to the first phase coil signal; the second control switch comprises a third connecting end, a fourth connecting end and a second signal end, the third connecting end and the fourth connecting end are respectively electrically connected with the second control end and the first control end, and the second signal end is electrically connected with the second phase coil signal; the third control switch comprises a fifth connecting end, a sixth connecting end and a third signal end, the fifth connecting end and the sixth connecting end are respectively electrically connected with the fourth control end and the fifth control end, and the third signal end is electrically connected with the first phase induction signal; the fourth control switch comprises a seventh connecting end, an eighth connecting end and a fourth signal end, the seventh connecting end and the eighth connecting end are respectively electrically connected with the fifth control end and the fourth control end, and the fourth signal end is electrically connected with the second phase induction signal.

12. The steering control system for a three-phase motor according to claim 11, wherein the first connection terminal of the first control switch is electrically connected to the first signal terminal according to the first steering signal, so that the first-phase coil signal is electrically connected to the first control terminal; the third connecting end of the second control switch is electrically connected with the second signal end, so that the second phase coil signal is electrically connected with the second control end; the fifth connection end of the third control switch is electrically connected to the third signal end, so that the first phase sensing signal is electrically connected to the fourth control end, and the seventh connection end of the fourth control switch is electrically connected to the fourth signal end, so that the second phase sensing signal is electrically connected to the fifth control end.

13. The steering control system for a three-phase motor according to claim 11, wherein the second connection terminal of the first control switch is electrically connected to the first signal terminal according to the second steering signal, so that the first-phase coil signal is electrically connected to the second control terminal; the fourth connecting end of the second control switch is electrically connected with the second signal end, so that the second phase coil signal is electrically connected with the first control end; the sixth connection end of the third control switch is electrically connected to the third signal end, so that the first phase sensing signal is electrically connected to the fifth control end, and the eighth connection end of the fourth control switch is electrically connected to the fourth signal end, so that the second phase sensing signal is electrically connected to the fourth control end.

14. The steering control system for a three-phase motor according to claim 8, wherein the control switch set includes a first electronic switch, a second electronic switch, a third electronic switch, a fourth electronic switch, a fifth electronic switch, a sixth electronic switch, a seventh electronic switch, and an eighth electronic switch, the first electronic switch includes a first connection terminal and a first signal terminal, the first connection terminal is electrically connected to the fourth control terminal, and the first signal terminal is electrically connected to the first phase induction signal; the second electronic switch comprises a second connecting end and a second signal end, the second connecting end is electrically connected with the fifth control end, and the second signal end is electrically connected with the first phase induction signal; the third electronic switch comprises a third connecting end and a third signal end, the third connecting end is electrically connected with the fourth control end, and the third signal end is electrically connected with the second phase induction signal; the fourth electronic switch comprises a fourth connecting end and a fourth signal end, the fourth connecting end is electrically connected with the fifth control end, and the fourth signal end is electrically connected with the second phase induction signal; the fifth electronic switch comprises a fifth connecting end and a fifth signal end, the fifth connecting end is electrically connected with the first control end, and the fifth signal end is electrically connected with the first phase coil signal; the sixth electronic switch comprises a sixth connecting end and a sixth signal end, the sixth connecting end is electrically connected with the second control end, and the sixth signal end is electrically connected with the first phase coil signal; the seventh electronic switch comprises a seventh connecting end and a seventh signal end, the seventh connecting end is electrically connected with the first control end, and the seventh signal end is electrically connected with the second phase coil signal; the eighth electronic switch comprises an eighth connecting end and an eighth signal end, the eighth connecting end is electrically connected with the second control end, and the eighth signal end is electrically connected with the second phase coil signal.

15. The steering control system for a three-phase motor according to claim 14, wherein according to the first steering signal, the first electronic switch, the fourth electronic switch, the fifth electronic switch and the eighth electronic switch are turned on, the second electronic switch, the third electronic switch, the sixth electronic switch and the seventh electronic switch are turned off, the first connection terminal of the first electronic switch is electrically connected to the first signal terminal, so that the first phase sensing signal is electrically connected to the fourth control terminal; the fourth connection end of the fourth electronic switch is electrically connected with the fourth signal end, so that the second phase induction signal is electrically connected with the fifth control end; the fifth connecting end of the fifth electronic switch is electrically connected with the fifth signal end, so that the first phase coil signal is electrically connected with the first control end, and the eighth connecting end of the eighth electronic switch is electrically connected with the eighth signal end, so that the second phase coil signal is electrically connected with the second control end.

16. The steering control system for a three-phase motor according to claim 14, wherein the first electronic switch, the fourth electronic switch, the fifth electronic switch and the eighth electronic switch are not turned on, the second electronic switch, the third electronic switch, the sixth electronic switch and the seventh electronic switch are turned on, and the second connection terminal of the second electronic switch is electrically connected to the second signal terminal, so that the first phase sensing signal is electrically connected to the fifth control terminal; the third connection end of the third electronic switch is electrically connected with the third signal end, so that the second phase induction signal is electrically connected with the fourth control end; the sixth connection end of the sixth electronic switch is electrically connected to the sixth signal end, so that the first-phase coil signal is electrically connected to the second control end, and the seventh connection end of the seventh electronic switch is electrically connected to the seventh signal end, so that the second-phase coil signal is electrically connected to the first control end.

Technical Field

The invention relates to a steering control system for a three-phase motor.

Background

It is known that the steering control of a three-phase motor must switch and control the power source phase of the three-phase motor, and the related control circuit or program must be modified to correspondingly detect the steering direction of the motor and the position of the rotor, which results in a complicated control circuit or program and increases the design cost and component cost.

Disclosure of Invention

The invention relates to a steering control system for a three-phase motor. A steering control system for a three-phase motor includes: a set of three-phase motor coils, a set of three-phase induction circuit, a control circuit and a control switch set. The three-phase motor coil comprises a first coil, a second coil and a third coil. The three-phase induction circuit comprises a first induction circuit, a second induction circuit and a third induction circuit, and the three-phase induction circuit is used for inducing the position of a rotor. The control circuit is used for providing a three-phase coil signal and receiving a three-phase induction signal, the three-phase coil signal is used for providing a signal to the three-phase motor coil, and the three-phase induction signal comes from the three-phase induction circuit. The control switch set is used for simultaneously switching and controlling the three-phase coil signal to the three-phase motor coil and the three-phase induction signal from the three-phase induction circuit so as to control the steering of the three-phase motor.

Therefore, the control switch group is used for simultaneously switching and controlling the three-phase coil signal and the three-phase induction signal so as to correctly induce the position of the rotor, and the control circuit does not need to carry out any circuit change design or program modification, thereby greatly saving the design cost and the element cost and reducing the complexity of element maintenance.

Drawings

FIG. 1 shows a block schematic diagram of a steering control system for a three-phase motor of the present invention;

FIG. 2 is a block diagram of a steering control system for a three-phase motor according to an embodiment of the present invention;

FIG. 3 is a block diagram of a steering control system (first steering signal) for a three-phase motor according to another embodiment of the present invention;

FIG. 4 is a block diagram of a steering control system (second steering signal) for a three-phase motor according to another embodiment of the present invention; and

fig. 5 shows a block diagram of a steering control system for a three-phase motor according to yet another embodiment of the present invention.

Reference numerals:

10 steering control system

20 three-phase motor coil

21 first coil

22 second coil

23 third coil

30 three-phase induction circuit

31 first induction circuit

32 second sensing circuit

33 third sensing circuit

40 control circuit

41 first phase coil signal

42 second phase coil signal

43 third phase coil signal

44 first phase induction signal

45 second phase induction signal

46 third phase induction signal

47 turn signal

50 control switch group

51 connecting side

52 signal side

61 first control switch

62 second control switch

63 third control switch

64 fourth control switch

71 first electronic switch

72 second electronic switch

73 third electronic switch

74 fourth electronic switch

75 fifth electronic switch

76 sixth electronic switch

77 seventh electronic switch

78 eighth electronic switch

211 first control terminal

221 second control terminal

231 third control terminal

311 fourth control terminal

321 fifth control terminal

331 sixth control terminal

611 first connection end

612 second connection end

613 first signal terminal

621 third connecting end

622 fourth connection end

623 second signal terminal

631 fifth connection terminal

632 sixth connecting end

633 third signal terminal

641 seventh connecting end

642 eighth Link end

643 fourth signal terminal

711 first connecting end

712 first signal terminal

721 second connection end

722 second signal terminal

731 third connecting end

732 third signal terminal

741 fourth connection end

742 fourth signal terminal

751 fifth connection end

752 fifth signal terminal

761 sixth connection terminal

762 sixth signal terminal

771 seventh connection terminal

772 seventh signal terminal

781 eighth connecting terminal

782 eighth signal terminal

Detailed Description

Fig. 1 shows a block schematic diagram of a steering control system for a three-phase motor according to the present invention. In an embodiment, the steering control system of the present invention can be used for steering control of a three-phase motor, such as clockwise rotation or counterclockwise rotation, or controlling an object (e.g., an electric wheelchair, an electric vehicle, etc.) to which the motor is applied to move forward or backward, but not limited thereto.

The steering control system 10 of the invention includes: a set of three-phase motor coils 20, a set of three-phase induction circuits 30, a control circuit 40 and a control switch set 50. The three-phase motor coil 20 includes a first coil 21, a second coil 22 and a third coil 23. The three-phase sensing circuit 30 includes a first sensing circuit 31, a second sensing circuit 32 and a third sensing circuit 33, and the three-phase sensing circuit 30 is used for sensing the position of a rotor.

In one embodiment, the control circuit 40 is configured to provide three-phase coil signals 41, 42, 43 and receive three-phase induction signals 44, 45, 46, the three-phase coil signals 41, 42, 43 are configured to provide signals to the three-phase motor coil 20, and the three-phase induction signals 44, 45, 46 are from the three-phase induction circuit 30. The control switch set 50 is used for simultaneously switching and controlling the three-phase coil signals 41, 42, 43 to the three-phase motor coil 20 and the three-phase induction signals 44, 45, 46 from the three-phase induction circuit 30 to control the rotation direction of the three-phase motor.

The steering control system of the invention utilizes the control switch group to simultaneously switch and control the three-phase coil signal and the three-phase induction signal so as to correctly induce the position of the rotor after switching control, so that the control circuit does not need to carry out any circuit change design or program modification, thereby greatly saving the design cost and the element cost and reducing the element maintenance complexity.

Fig. 2 is a block diagram of a steering control system for a three-phase motor according to an embodiment of the present invention. Referring to fig. 1 and 2, in one embodiment, the control switch set 50 simultaneously switches and controls the phases of two of the three-phase coil signals 41, 42, 43 to the three-phase motor coil 20 and the phases of two of the three-phase induction signals 44, 45, 46 from the three-phase induction circuit 30, which correspond to the phases of two of the three-phase coil signals 41, 42, 43.

In one embodiment, the three-phase coil signal comprises: a first phase coil signal 41, a second phase coil signal 42, and a third phase coil signal 43. The three-phase induction signal comprises: a first phase induced signal 44, a second phase induced signal 45 and a third phase induced signal 46.

In one embodiment, the first coil 21 includes a first control terminal 211, the second coil 22 includes a second control terminal 221, and the third coil 23 includes a third control terminal 231. The first sensing circuit 31 includes a fourth control terminal 311, the second sensing circuit 32 includes a fifth control terminal 321, and the third sensing circuit 33 includes a sixth control terminal 331. The control switch set 50 has a connection side 51 and a signal side 52, wherein the connection side 51 includes a plurality of connection terminals electrically connected to two of the first control terminal 211, the second control terminal 221 and the third control terminal 231, and two of the fourth control terminal 311, the fifth control terminal 321 and the sixth control terminal 331 with corresponding phases. In the present embodiment, the connection side 51 is electrically connected to the first control terminal 211 and the second control terminal 221, and the fourth control terminal 311 and the fifth control terminal 321 of the corresponding phase.

In one embodiment, the signal side 52 includes a plurality of signal terminals respectively electrically connected to two of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43 of corresponding phases, and two of the first phase induced signal 44, the second phase induced signal 45, and the third phase induced signal 46 of corresponding phases. In the present embodiment, the signal side 52 is electrically connected to the first phase coil signal 41 and the second phase coil signal 42 of the corresponding phases, and the first phase induction signal 44 and the second phase induction signal 45 of the corresponding phases.

In one embodiment, the other of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43 is directly electrically connected to the other of the first control terminal 211, the second control terminal 221, and the third control terminal 231 of the corresponding phase; the other one of the first phase induced signal 44, the second phase induced signal 45 and the third phase induced signal 46 corresponding to the phase is directly and electrically connected to the other one of the fourth control terminal 311, the fifth control terminal 321 and the sixth control terminal 331 corresponding to the phase. In this embodiment, the third phase coil signal 43 is directly electrically connected to the third control terminal 231, and the third phase induction signal 46 is directly electrically connected to the sixth control terminal 331 of the corresponding phase.

In one embodiment, the control switch set 50 selectively switches and controls the electrical connection between two of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43 of the corresponding phase and two of the first control terminal 211, the second control terminal 221, and the third control terminal 231 of the corresponding phase according to a steering signal 47, and simultaneously switches and controls the electrical connection between two of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46 of the corresponding phase and two of the fourth control terminal 311, the fifth control terminal 321, and the sixth control terminal 331 of the corresponding phase. In this embodiment, the control switch set 50 selectively switches and controls the electrical connection between the first phase coil signal 41 and the second phase coil signal 42 of the corresponding phase and the first control terminal 211 and the second control terminal 221 of the corresponding phase, and simultaneously switches and controls the electrical connection between the first phase induction signal 44 and the second phase induction signal 45 of the corresponding phase and the fourth control terminal 311 and the fifth control terminal 321 of the corresponding phase.

In one embodiment, the steering signal 47 includes a first steering signal and a second steering signal, the first steering signal can be a clockwise rotation signal, and the second steering signal can be a counterclockwise rotation signal. According to the first steering signal, the first phase coil signal 41 is switched to be electrically connected to the first control terminal 211, the second phase coil signal 42 is switched to be electrically connected to the second control terminal 221, and the first phase induction signal 44 is simultaneously switched to be electrically connected to the fourth control terminal 311, and the second phase induction signal 45 is switched to be electrically connected to the fifth control terminal 321. At this time, the first phase coil signal 41 is supplied to the first coil 21, and the second phase coil signal 42 is supplied to the second coil 22, in which case the rotation direction of the three-phase motor is clockwise rotation.

In an embodiment, according to the second steering signal, the first phase coil signal 41 is switched to be electrically connected to the second control terminal 221, the second phase coil signal 42 is switched to be electrically connected to the first control terminal 211, and the first phase induction signal 44 is switched to be electrically connected to the fifth control terminal 321, and the second phase induction signal 45 is switched to be electrically connected to the fourth control terminal 311. Therefore, the first phase coil signal 41 is provided to the second coil 22, the second phase coil signal 42 is provided to the first coil 21, the phase signals of the first coil 21 and the second coil 22 are exchanged, and the first induction circuit 31 and the second induction circuit 32 are also correspondingly switched and exchanged at the same time, so that the rotation direction of the three-phase motor is counterclockwise rotation, and the position of the rotor after switching control can be correctly induced, and the control circuit 40 does not need to perform any circuit design change or program modification, so as to greatly save the design cost and the component cost, and reduce the complexity of component maintenance.

In one embodiment, the turning signal may be a signal sent by the control circuit, or a signal directly sent by a user using a manual switch (forward or reverse).

Fig. 3 is a block diagram of a steering control system (first steering signal) for a three-phase motor according to another embodiment of the present invention. Referring to fig. 3, in an embodiment, the control switch set 50 includes a first control switch 61, a second control switch 62, a third control switch 63 and a fourth control switch 64, the first control switch 61 includes a first connection end 611, a second connection end 612 and a first signal end 613, the first connection end 611 and the second connection end 612 are electrically connected to the first control end 211 and the second control end 221 respectively, and the first signal end 613 is electrically connected to the first phase coil signal 41; the second control switch 62 includes a third connection end 621, a fourth connection end 622 and a second signal end 623, the third connection end 621 and the fourth connection end 622 are electrically connected to the second control end 221 and the first control end 211, respectively, and the second signal end 623 is electrically connected to the second phase coil signal 42; the third control switch 63 includes a fifth connection terminal 631, a sixth connection terminal 632, and a third signal terminal 633, wherein the fifth connection terminal 631 and the sixth connection terminal 632 are electrically connected to the fourth control terminal 311 and the fifth control terminal 321, respectively, and the third signal terminal 633 is electrically connected to the first phase sensing signal 44; the fourth control switch 64 includes a seventh connection end 641, an eighth connection end 642 and a fourth signal end 643, wherein the seventh connection end 641 and the eighth connection end 642 are electrically connected to the fifth control end 321 and the fourth control end 311, respectively, and the fourth signal end 643 is electrically connected to the second phase sensing signal 45.

According to the first steering signal, the first connection end 611 of the first control switch 61 is electrically connected to the first signal end 613, so that the first phase coil signal 41 is electrically connected to the first control end 211; the third connection end 621 of the second control switch 62 is electrically connected to the second signal end 623, so that the second phase coil signal 42 is electrically connected to the second control end 221; the fifth connection end 631 of the third control switch 63 is electrically connected to the third signal end 633, such that the first phase sensing signal 44 is electrically connected to the fourth control end 311, and the seventh connection end 641 of the fourth control switch 64 is electrically connected to the fourth signal end 643, such that the second phase sensing signal 45 is electrically connected to the fifth control end 321. In this case, the rotation direction of the three-phase motor may be clockwise rotation.

Fig. 4 is a block diagram of a steering control system (second steering signal) for a three-phase motor according to another embodiment of the present invention. Referring to fig. 4, according to the second steering signal, the second connection end 612 of the first control switch 61 is electrically connected to the first signal end 613, so that the first phase coil signal 41 is electrically connected to the second control end 221; the fourth connection end 622 of the second control switch 62 is electrically connected to the second signal end 623, so that the second phase coil signal 42 is electrically connected to the first control end 211; the sixth connection terminal 632 of the third control switch 63 is electrically connected to the third signal terminal 633, such that the first phase sensing signal 44 is electrically connected to the fifth control terminal 321, and the eighth connection terminal 642 of the fourth control switch 64 is electrically connected to the fourth signal terminal 643, such that the second phase sensing signal 45 is electrically connected to the fourth control terminal 311. In this case, the rotation direction of the three-phase motor is counterclockwise rotation.

Therefore, in the present embodiment, the first control switch 61, the second control switch 62, the third control switch 63 and the fourth control switch 64 of the control switch set 50 are used to exchange the phase signals of the first coil 21 and the second coil 22, and the first induction circuit 31 and the second induction circuit 32 are also correspondingly exchanged at the same time, so as to achieve the steering control of the three-phase motor. Similarly, the control circuit 40 does not need to perform any circuit design change or program modification, which can greatly save the cost.

Fig. 5 shows a block diagram of a steering control system for a three-phase motor according to yet another embodiment of the present invention. Referring to fig. 5, in an embodiment, the control switch set 50 includes a first electronic switch 71, a second electronic switch 72, a third electronic switch 73, a fourth electronic switch 74, a fifth electronic switch 75, a sixth electronic switch 76, a seventh electronic switch 77, and an eighth electronic switch 78, the first electronic switch 71 includes a first connection end 711 and a first signal end 712, the first connection end 711 is electrically connected to the fourth control end 311, and the first signal end 712 is electrically connected to the first phase sensing signal 44; the second electronic switch 72 includes a second connection end 721 and a second signal end 722, the second connection end 721 is electrically connected to the fifth control end 321, the second signal end 722 is electrically connected to the first phase sensing signal 44; the third electronic switch 73 includes a third connection terminal 731 and a third signal terminal 732, the third connection terminal 731 is electrically connected to the fourth control terminal 311, and the third signal terminal 732 is electrically connected to the second phase sensing signal 45; the fourth electronic switch 74 includes a fourth connection end 741 and a fourth signal end 742, the fourth connection end 741 is electrically connected to the fifth control end 321, and the fourth signal end 742 is electrically connected to the second phase sensing signal 45; the fifth electronic switch 75 includes a fifth connection terminal 751 and a fifth signal terminal 752, the fifth connection terminal 751 is electrically connected to the first control terminal 211, and the fifth signal terminal 752 is electrically connected to the first phase coil signal 41; the sixth electronic switch 76 includes a sixth connection end 761 and a sixth signal end 762, wherein the sixth connection end 761 is electrically connected to the second control end 221, and the sixth signal end 762 is electrically connected to the first phase coil signal 41; the seventh electronic switch 77 includes a seventh connection terminal 771 and a seventh signal terminal 772, the seventh connection terminal 771 is electrically connected to the first control terminal 211, and the seventh signal terminal 772 is electrically connected to the second phase coil signal 42; the eighth electronic switch 78 includes an eighth connection terminal 781 and an eighth signal terminal 782, wherein the eighth connection terminal 781 is electrically connected to the second control terminal 221, and the eighth signal terminal 782 is electrically connected to the second phase coil signal 42.

According to the first steering signal, the first electronic switch 71, the fourth electronic switch 74, the fifth electronic switch 75 and the eighth electronic switch 78 are turned on, the second electronic switch 72, the third electronic switch 73, the sixth electronic switch 76 and the seventh electronic switch 77 are not turned on, the first connection end 711 of the first electronic switch 71 is electrically connected to the first signal end 712, so that the first phase sensing signal 44 is electrically connected to the fourth control end 311; the fourth connection end 741 of the fourth electronic switch 74 is electrically connected to the fourth signal end 742, so that the second phase sensing signal 45 is electrically connected to the fifth control end 321; the fifth connection terminal 751 of the fifth electronic switch 75 is electrically connected to the fifth signal terminal 752, such that the first phase coil signal 41 is electrically connected to the first control terminal 211, and the eighth connection terminal 781 of the eighth electronic switch 78 is electrically connected to the eighth signal terminal 782, such that the second phase coil signal 42 is electrically connected to the second control terminal 221. In this case, the rotation direction of the three-phase motor is clockwise rotation.

According to the second steering signal, the first electronic switch 71, the fourth electronic switch 74, the fifth electronic switch 75 and the eighth electronic switch 78 are not turned on, the second electronic switch 72, the third electronic switch 73, the sixth electronic switch 76 and the seventh electronic switch 77 are turned on, the second connection end 721 of the second electronic switch 72 is electrically connected to the second signal end 722, so that the first phase sensing signal 44 is electrically connected to the fifth control end 321; the third connection end 731 of the third electronic switch 73 is electrically connected to the third signal end 732, so that the second phase induced signal 45 is electrically connected to the fourth control end 311; the sixth connection terminal 761 of the sixth electronic switch 76 is electrically connected to the sixth signal terminal 762, so that the first phase coil signal 41 is electrically connected to the second control terminal 221, and the seventh connection terminal 771 of the seventh electronic switch 77 is electrically connected to the seventh signal terminal 772, so that the second phase coil signal 42 is electrically connected to the first control terminal 211. In this case, the three-phase motor is rotated in a counterclockwise direction

Therefore, in the present embodiment, the first electronic switch 71, the second electronic switch 72, the third electronic switch 73, the fourth electronic switch 74, the fifth electronic switch 75, the sixth electronic switch 76, the seventh electronic switch 77 and the eighth electronic switch 78 of the control switch set 50 are utilized to enable the phase signals of the first coil 21 and the second coil 22 to be exchanged, and the first induction circuit 31 and the second induction circuit 32 are correspondingly switched and exchanged at the same time, so as to achieve the steering control of the three-phase motor. Similarly, the control circuit 40 does not need to perform any circuit design change or program modification, which can greatly save the cost.

In the above embodiment, the control switch set 50 switches and controls two of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43, for example: the first phase coil signal 41 and the second phase coil signal 42, and two of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46 of the corresponding phases are switched and controlled simultaneously, for example: the first phase induced signal 44 and the second phase induced signal 45. In other embodiments, the control switch set 50 can switch and control two of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43, for example: the second phase coil signal 42 and the third phase coil signal 43, and simultaneously switch and control two of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46 of corresponding phases, for example: the second phase induced signal 45 and the third phase induced signal 46. Alternatively, the control switch set 50 can switch and control two of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43, for example: the first phase coil signal 41 and the third phase coil signal 43, and simultaneously switch and control two of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46 of corresponding phases, for example: the first phase induced signal 44 and the third phase induced signal 46.

The above embodiments are merely illustrative of the principles and effects of the present invention, and do not limit the present invention. Modifications and variations of the above-described embodiments may be made by those skilled in the art without departing from the spirit of the invention. The scope of the claims of the present invention should be determined by reference to the appended claims.