阅读说明：本技术 冗余旋转变压器装置及电动助力转向装置 (Redundant rotary transformer device and electric power steering device ) 是由 池田纮子 森辰也 元吉研太 冈崎广大 池田宪司 杉野阳介 泽田诚晋 久保建太 松永俊 于 2019-05-24 设计创作，主要内容包括：在本发明的冗余旋转变压器装置中,不同系统的绕组组配置在定子铁芯的周向的不同位置。各个系统的绕组组由多个励磁绕组形成,并具有连接到对应的励磁电路的励磁绕组组、第一输出绕组组和第二输出绕组组。对应的励磁绕组卷绕在各个齿上。当将属于彼此不同的系统并且在定子铁芯的周向上彼此相邻配置的两个励磁绕组中的一个设为第一端部励磁绕组,而将另一个设为第二端部励磁绕组时,通过向第一端部励磁绕组和第二端部励磁绕组施加励磁信号,从而产生定子铁芯的径向的相同朝向的磁通。(In the redundant resolver device of the present invention, the winding groups of different systems are arranged at different positions in the circumferential direction of the stator core. The winding group of each system is formed of a plurality of excitation windings, and has an excitation winding group, a first output winding group, and a second output winding group connected to a corresponding excitation circuit. A corresponding field winding is wound around each tooth. When one of two excitation windings belonging to mutually different systems and arranged adjacent to each other in the circumferential direction of the stator core is set as a first end excitation winding and the other is set as a second end excitation winding, magnetic fluxes in the same orientation in the radial direction of the stator core are generated by applying excitation signals to the first end excitation winding and the second end excitation winding.)

1. A redundant resolver arrangement, comprising:

a resolver main body having a stator and a rotor rotatable with respect to the stator; and

a control unit having a plurality of excitation circuits,

the stator has a stator core and a plurality of systems of winding groups provided on the stator core,

the stator core has a core back and a plurality of teeth protruding from the core back,

the winding groups of different systems are arranged at different positions in the circumferential direction of the stator core,

the winding group of each system has:

an excitation winding group formed of a plurality of excitation windings and connected to the corresponding excitation circuit;

a first output winding group formed of a plurality of first output windings; and

a second output winding group formed of a plurality of second output windings,

winding a corresponding one of said field windings around each of said teeth,

when one of two of the excitation windings belonging to mutually different systems and arranged adjacent to each other in the circumferential direction of the stator core is set as a first end excitation winding and the other is set as a second end excitation winding, magnetic fluxes in the same orientation in the radial direction of the stator core are generated by applying excitation signals to the first end excitation winding and the second end excitation winding.

2. The redundant resolver arrangement of claim 1,

the first end portion excitation winding and the second end portion excitation winding are wound in the same direction as each other,

the connection direction in which the first end portion excitation winding is connected to the corresponding excitation circuit is the same as the connection direction in which the second end portion excitation winding is connected to the corresponding excitation circuit.

3. The redundant resolver arrangement of claim 1,

the first end portion excitation winding and the second end portion excitation winding are wound in opposite directions to each other,

the connection direction of the first end portion excitation winding to the corresponding excitation circuit is opposite to the connection direction of the second end portion excitation winding to the corresponding excitation circuit.

4. The redundant resolver arrangement according to any one of claims 1 to 3,

the stator core is formed by combining a plurality of arc-shaped divided cores.

5. The redundant resolver arrangement according to any one of claims 1 to 3,

the stator core is formed of core blocks having the same number of teeth as the teeth, and is deformable between a state in which the core blocks are arranged in an annular shape and a state in which the core blocks are linearly expanded.

6. An electric power steering apparatus, characterized in that,

a redundant resolver arrangement according to any one of claims 1 to 5.

Technical Field

The present invention relates to a redundant resolver device in which a plurality of winding sets of a system are provided in a stator core, and an electric power steering device including the redundant resolver device.

Background

In the conventional resolver, in order to suppress deterioration of the angle detection accuracy due to magnetic interference, two sensor portions are stacked in two stages in the axial direction. In addition, only the first output winding is wound around one sensor portion, and only the second output winding is wound around the other sensor portion (see, for example, patent documents 1 and 2).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-222435

Patent document 2: japanese patent laid-open publication No. 2009-222436

Disclosure of Invention

Technical problem to be solved by the invention

In the above-described conventional resolver, since two sensor components are stacked in two stages in the axial direction, the axial direction size is increased to two times as compared with the resolver of one system. In addition, magnetic interference occurs between adjacent teeth, reducing the angle detection accuracy.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a redundant resolver device capable of suppressing an increase in the axial dimension of a resolver main body and a decrease in angle detection accuracy due to redundancy, and an electric power steering device including the redundant resolver device.

Means for solving the problems

The redundant resolver device of the present invention includes: a resolver main body having a stator and a rotor rotatable with respect to the stator; and a control unit having a plurality of excitation circuits, wherein the stator includes a stator core and a plurality of winding groups of systems provided on the stator core, the stator core includes a core back and a plurality of teeth protruding from the core back, the winding groups of different systems are arranged at different positions in a circumferential direction of the stator core, and each winding group of the systems includes: an excitation winding group formed of a plurality of excitation windings and connected to corresponding excitation circuits; a first output winding group formed of a plurality of first output windings; and a second output winding group formed of a plurality of second output windings, the corresponding excitation windings being wound on the respective teeth, and when one of two excitation windings belonging to mutually different systems and arranged adjacent to each other in a circumferential direction of the stator core is set as a first end excitation winding and the other is set as a second end excitation winding, by applying excitation signals to the first end excitation winding and the second end excitation winding, magnetic fluxes in the same orientation in a radial direction of the stator core are generated.

Effects of the invention

According to the present invention, an increase in the axial dimension of the resolver body and a decrease in the angle detection accuracy due to redundancy can be suppressed.

Drawings

Fig. 1 is a configuration diagram showing a state in which a redundant resolver device according to embodiment 1 of the present invention is mounted on a rotating electrical machine.

Fig. 2 is a sectional view of the resolver body of fig. 1.

Fig. 3 is a sectional view illustrating the stator of fig. 2.

Fig. 4 is a block diagram illustrating the winding unit and the control unit of fig. 1.

Fig. 5 is an explanatory diagram showing the distribution of the number of turns of the first excitation winding and the second excitation winding of fig. 3.

Fig. 6 is a sectional view showing a main portion of fig. 3 in an enlarged manner.

Fig. 7 is an explanatory diagram showing the distribution of the number of turns of the first field winding and the second field winding of the redundant resolver device according to embodiment 2 of the present invention.

Fig. 8 is an explanatory diagram showing the distribution of the number of turns of the first field winding and the second field winding of the redundant resolver device according to embodiment 3 of the present invention.

Fig. 9 is a block diagram showing a winding unit and a control unit of the redundant resolver device according to embodiment 3.

Fig. 10 is an explanatory diagram showing a modification of the number-of-turns distribution in fig. 8.

Fig. 11 is a sectional view showing a stator of a redundant resolver device according to embodiment 4 of the present invention.

Fig. 12 is a block diagram showing a winding unit and a control unit of the redundant resolver device according to embodiment 4.

Fig. 13 is an explanatory diagram showing the distribution of the number of turns of the first excitation winding, the second excitation winding, and the third excitation winding of the redundant resolver device according to embodiment 4.

Fig. 14 is a sectional view showing a stator of a redundant resolver device according to embodiment 5 of the present invention.

Fig. 15 is a plan view showing the division core of fig. 14.

Fig. 16 is a sectional view showing a stator of a redundant resolver device according to embodiment 6 of the present invention.

Fig. 17 is a plan view showing the division core of fig. 16.

Fig. 18 is an explanatory diagram illustrating a method of punching core sheets constituting the stator cores of embodiments 1 to 4 from a core sheet.

Fig. 19 is an explanatory diagram illustrating a method of punching out core pieces constituting the split cores of embodiment 6 from a core sheet.

Fig. 20 is a sectional view showing a stator core of a redundant resolver device according to embodiment 7 of the present invention.

Fig. 21 is a cross-sectional view showing a state in which the stator core of fig. 20 is linearly developed.

Fig. 22 is a side view showing an example of an electric power steering apparatus to which the redundant resolver apparatus of the present invention is applied.

Detailed Description

The following describes a mode for carrying out the present invention with reference to the drawings.

Embodiment 1.

Fig. 1 is a configuration diagram showing a state in which a redundant resolver device according to embodiment 1 of the present invention is mounted on a rotating electrical machine. In fig. 1, a rotating electrical machine 1 has a rotating electrical machine body 2 and a rotating shaft 3. The rotary shaft 3 is rotatable relative to the rotating electric machine body 2. An end of the rotating shaft 3 protrudes from the rotating electric machine body 2.

The redundant resolver device 4 includes a resolver main body 5 and a control unit 6. The resolver body 5 has a rotor 7 and a stator 8. The rotor 7 is mechanically connected to an end of the rotary shaft 3, and rotates integrally with the rotary shaft 3. Further, the rotor 7 penetrates the stator 8, and is rotatable with respect to the stator 8.

The stator 8 surrounds the rotor 7. Further, the stator 8 has a stator core 9 and a winding portion 10. The winding portion 10 is provided on the stator core 9.

The redundant resolver device 4 detects the rotation angle of the rotating shaft 3 using the change in the permeance in the gap between the rotor 7 and the stator 8. That is, the redundant resolver device 4 functions as a rotation angle detection device that detects the rotation angle of the rotating shaft 3.

Fig. 2 is a sectional view of the resolver body 5 in fig. 1, showing a section at right angles to the axial direction of the rotor 7. The axial direction is a direction parallel to the rotation center of the rotor 7. The radial direction is a direction orthogonal to the rotation center of the rotor 7. The circumferential direction is a direction in which the rotor 7 rotates about the rotation center thereof.

When Nx is a natural number, the rotor 7 has Nx salient poles 7 a. That is, the shaft multiple angle of the rotor 7 is Nx. The number Nx of salient poles 7a in embodiment 1 is 5.

The stator core 9 has an annular core back 9a and a plurality of teeth 9b protruding radially inward from the core back 9 a.

Fig. 3 is a sectional view showing the stator 8 of fig. 2. The number Ns of teeth 9b in embodiment 1 is 12. When 12 teeth 9b are sequentially T1 to T12 in the clockwise direction, teeth T1 to T6 are teeth of the first system, and teeth T7 to T12 are teeth of the second system.

The corresponding first excitation winding 11a, the corresponding first output winding 11b, and the corresponding second output winding 11c are wound around the teeth T1 to T6 of the first system.

The corresponding second excitation winding 11d, the corresponding third output winding 11e, and the corresponding fourth output winding 11f are wound around the respective teeth T7 to T12 of the second system. The third output winding 11e is the first output winding of the second system. The fourth output winding 11f is a second output winding of the second system.

Thereby, the one-phase excitation winding and the two-phase output winding are wound around each tooth 9 b. In embodiment 1, the one-phase field winding is wound around each tooth 9b, and the two-phase output winding is wound around the one-phase field winding.

Either one of the first output winding 11b and the second output winding 11c may be wound first. In addition, either one of the third output winding 11e and the fourth output winding 11f may be wound first. Note that, the tooth 9b of one of the two-phase output windings may not be wound.

Stator core 9 and windings 11a to 11f are insulated from each other by an insulator not shown. As the insulator, a resin holder, insulating paper, an insulating coating, or the like is used.

Fig. 4 is a block diagram illustrating the winding part 10 and the control part 6 in fig. 1. The winding portion 10 has a plurality of winding groups of systems. The winding unit 10 of embodiment 1 has two winding sets. That is, embodiment 1 shows a redundant resolver device 4 of a dual system.

The winding sets of the first system include a first excitation winding set 12a, a first output winding set 12b, and a second output winding set 12 c. The winding sets of the second system include a second excitation winding set 12d, a third output winding set 12e, and a fourth output winding set 12 f. The third output winding group 12e is the first output winding group of the second system. The fourth output winding group 12f is a second output winding group of the second system.

The first field winding group 12a is formed of six first field windings 11a wound around the teeth T1 to T6. The six first excitation windings 11a are connected in series.

The first output winding group 12b is formed of six first output windings 11b wound around the teeth T1 to T6. The six first output windings 11b are connected in series. The second output winding group 12c is formed of six second output windings 11c wound around the teeth T1 to T6. The six second output windings 11c are connected in series.

The second excitation winding group 12d is formed of six second excitation windings 11d wound around the teeth T7 to T12. The six second excitation windings 11d are connected in series.

The third output winding group 12e is formed of six third output windings 11e wound around the teeth T7 to T12. The six third output windings 11e are connected in series. The fourth output winding group 12f is constituted by six fourth output windings 11f wound around the teeth T7 to T12. The six fourth output windings 11f are connected in series.

The winding groups of different systems are arranged at different positions in the circumferential direction of the stator core 9. Further, in each system, the tooth from which the winding starts may be any tooth.

The control unit 6 includes a first exciting circuit 13, a first angle calculating unit 14, a second exciting circuit 15, and a second angle calculating unit 16. First excitation circuit 13 and second excitation circuit 15 are independent of each other.

The first excitation circuit 13 and the first angle calculation unit 14 belong to a first system. The second exciting circuit 15 and the second angle calculating unit 16 belong to a second system.

The first excitation winding group 12a is electrically connected to the first excitation circuit 13 via an excitation terminal not shown. The first output winding group 12b and the second output winding group 12c are electrically connected to the first angle arithmetic section 14 via output terminals not shown. The excitation terminal and the output terminal are provided at an unillustrated extension portion of the resolver main body 5.

The second excitation winding group 12d is electrically connected to the second excitation circuit 15 via an excitation terminal. The third output winding group 12e and the fourth output winding group 12f are electrically connected to the second angle arithmetic section 16 via output terminals.

The first angle calculation unit 14 calculates and outputs a first system detection angle θ 1 of the rotor 7 based on output signals from the first and second output winding groups 12b and 12 c. The second angle calculation unit 16 calculates and outputs a second system detection angle θ 2 of the rotor 7 based on output signals from the third and fourth output winding groups 12e and 12 f.

Fig. 5 is an explanatory diagram showing the distribution of the number of turns of the first excitation winding 11a and the second excitation winding 11d in fig. 3. Fig. 5 shows the number of turns of the first excitation winding 11a and the second excitation winding 11d in succession.

Further, "+" and "-" indicate winding polarities of the windings that are different from each other. That is, when the winding direction of the electric wire in a certain winding is denoted by "+", the opposite winding direction is denoted by "-". When currents of the same direction flow through the winding of the winding direction "+" and the winding of the winding direction "-", directions of the generated electromagnetic fields are opposite to each other in the radial direction of the stator core 9.

The absolute value of the number of turns in the winding direction "+" is the same as the absolute value of the number of turns in the winding direction "-". That is, if the number of turns in the winding direction "+" is + X turns, the number of turns in the winding direction "-" is-X turns. In addition, the number of turns of the field winding is normalized by the amplitude of the number of turns.

In the first and second excitation windings 11a and 11d of embodiment 1, the windings in the winding direction "+" and the windings in the winding direction "-" are alternately arranged in two in the circumferential direction of the stator core 9.

Further, the first and second excitation windings 11a and 11d adjacent to each other in the circumferential direction of the stator core 9 have the same winding direction. That is, in fig. 5, the winding direction of the first excitation winding 11a of the tooth T1 is the same as the winding direction of the second excitation winding 11d of the tooth T12. Further, the winding direction of the first excitation winding 11a of the tooth T6 is the same as the winding direction of the second excitation winding 11d of the tooth T7.

Fig. 6 is a sectional view showing a main portion of fig. 3 in an enlarged manner. In fig. 6, the direction of the magnetic flux generated in the tooth T1 and the tooth T12 and interlinking with the tooth T1 and the tooth T12 is shown by an arrow. The direction of the magnetic flux generated in the tooth T1 is the same as the direction of the magnetic flux generated in the tooth T12. Further, the direction of the magnetic flux generated in the tooth T6 is the same as the direction of the magnetic flux generated in the tooth T7.

When one of two excitation windings 11a, 11d belonging to mutually different systems and arranged adjacent to each other in the circumferential direction of the stator core 9 is set as a first end excitation winding and the other is set as a second end excitation winding, magnetic fluxes in the same orientation in the radial direction of the stator core 9 are generated by applying excitation signals to the first end excitation winding and the second end excitation winding.

Further, the first end portion excitation winding and the second end portion excitation winding are wound in the same direction as each other. Also, the connection direction of the first end portion excitation winding to the corresponding excitation circuit is the same as the connection direction of the second end portion excitation winding to the corresponding excitation circuit.

In such a redundant resolver device, the winding groups of different systems are arranged at different positions in the circumferential direction of the stator core 9. Therefore, an increase in the axial dimension of the resolver body due to redundancy can be suppressed.

In addition, magnetic fluxes in the same radial direction of the stator core 9 are generated in the first end portion field winding and the second end portion field winding. Therefore, the influence of magnetic interference between adjacent teeth can be reduced, and a decrease in angle detection accuracy due to a deviation between the excitation signal of the first system and the excitation signal of the second system can be suppressed.

Further, the first end portion excitation winding and the second end portion excitation winding are wound in the same direction as each other. Also, the connection direction of the first end portion excitation winding to the corresponding excitation circuit is the same as the connection direction of the second end portion excitation winding to the corresponding excitation circuit. Therefore, magnetic fluxes in the same radial direction of the stator core 9 can be generated in the first end portion field winding and the second end portion field winding.

Embodiment 2.

Next, fig. 7 is an explanatory diagram showing the distribution of the number of turns of the first excitation winding 11a and the second excitation winding 11d of the redundant resolver device according to embodiment 2 of the present invention. In the first and second excitation windings 11a and 11d of embodiment 2, the windings in the winding direction "+" and the windings in the winding direction "-" are alternately arranged in three in the circumferential direction of the stator core 9.

The winding direction of the first excitation winding 11a of the tooth T1, the winding direction of the second excitation winding 11d of the tooth T12, the winding direction of the first excitation winding 11a of the tooth T6, and the winding direction of the second excitation winding 11d of the tooth T7 are the same. The other structure is the same as embodiment 1.

With such a configuration, it is possible to suppress an increase in the axial dimension of the resolver body 5 and a decrease in the angle detection accuracy due to redundancy.

In addition, how many excitation windings having the same winding direction are arranged in succession is not limited to two or three.

Embodiment 3.

Next, fig. 8 is an explanatory diagram showing the distribution of the number of turns of the first excitation winding 11a and the second excitation winding 11d of the redundant resolver device according to embodiment 3 of the present invention. In the first and second excitation windings 11a and 11d of embodiment 3, the windings in the winding direction "+" and the windings in the winding direction "-" are alternately arranged one by one in the circumferential direction of the stator core 9. "

Therefore, the winding direction of the first excitation winding 11a of the tooth T1 is opposite to the winding direction of the second excitation winding 11d of the tooth T12. Further, the winding direction of the first excitation winding 11a of the tooth T6 is opposite to the winding direction of the second excitation winding 11d of the tooth T7. That is, the first end portion excitation winding and the second end portion excitation winding are wound in opposite directions to each other.

Fig. 9 is a block diagram showing the winding unit 10 and the control unit 6 of the redundant resolver device according to embodiment 3. The connection direction of the first end portion excitation winding to the corresponding excitation circuit is opposite to the connection direction of the second end portion excitation winding to the corresponding excitation circuit. The other structure is the same as embodiment 1.

In such a redundant resolver device, the first end portion field winding and the second end portion field winding are wound in opposite directions to each other. The connection direction of the first end portion excitation winding to the corresponding excitation circuit is opposite to the connection direction of the second end portion excitation winding to the corresponding excitation circuit.

Therefore, magnetic fluxes in the same radial direction of the stator core 9 can be generated in the first end portion field winding and the second end portion field winding. Therefore, an increase in the axial dimension of the resolver body 5 and a decrease in the angle detection accuracy due to redundancy can be suppressed.

In embodiment 3, the field winding in the winding direction "+" and the field winding in the winding direction "-" are alternately arranged as one, but two or more field windings having the same winding direction may be continuously arranged.

For example, in fig. 10, the windings in the winding direction "+" and the windings in the winding direction "-" are alternately arranged in two in the circumferential direction of the stator core 9. Further, the first end portion excitation winding and the second end portion excitation winding are wound in opposite directions to each other. In this case, if the connection direction of the first end portion excitation winding to the corresponding excitation circuit is made opposite to the connection direction of the second end portion excitation winding to the corresponding excitation circuit, the same effect as that of embodiment 3 can be obtained.

Embodiment 4.

Next, fig. 11 is a sectional view showing a stator of a redundant resolver device according to embodiment 4 of the present invention. In embodiment 4, the teeth T1 to T4 are teeth of the first system, the teeth T5 to T8 are teeth of the second system, and the teeth T9 to T12 are teeth of the third system.

The corresponding first excitation winding 11a, the corresponding first output winding 11b, and the corresponding second output winding 11c are wound around the teeth T1 to T4 of the first system.

The corresponding second excitation winding 11d, the corresponding third output winding 11e, and the corresponding fourth output winding 11f are wound around the respective teeth T5 to T8 of the second system. The third output winding 11e is the first output winding of the second system. The fourth output winding 11f is a second output winding of the second system.

The corresponding third excitation winding 11g, the corresponding fifth output winding 11h, and the corresponding sixth output winding 11i are wound around the teeth T9 to T12 of the third system. The fifth output winding 11h is the first output winding of the third system. The sixth output winding 11i is the second output winding of the third system.

Fig. 12 is a block diagram showing the winding unit 10 and the control unit 6 of the redundant resolver device according to embodiment 4. The winding unit 10 of embodiment 4 has three winding groups. That is, embodiment 4 shows a redundant resolver device of a triple system.

The winding groups of the third system include a third excitation winding group 12g, a fifth output winding group 12h, and a sixth output winding group 12 i. The fifth output winding group 12h is the first output winding group of the third system. The sixth output winding group 12i is the second output winding group of the third system.

The first excitation winding group 12a is formed of four first excitation windings 11a wound around the teeth T1 to T4. The four first excitation windings 11a are connected in series.

The first output winding group 12b is formed of four first output windings 11b wound around the teeth T1 to T4. The four first output windings 11b are connected in series. The second output winding group 12c is formed of four second output windings 11c wound around the teeth T1 to T4. The six second output windings 11c are connected in series.

The second excitation winding group 12d is formed of four second excitation windings 11d wound around the teeth T5 to T8. The four second excitation windings 11d are connected in series.

The third output winding group 12e is formed by four third output windings 11e wound around the teeth T5 to T8. The four third output windings 11e are connected in series. The fourth output winding group 12f is formed by four fourth output windings 11f wound around the teeth T5 to T8. The four fourth output windings 11f are connected in series.

The third excitation winding group 12g is formed of four third excitation windings 11g wound around the teeth T9 to T12. The four third excitation windings 11g are connected in series.

The fifth output winding group 12h is formed by four fifth output windings 11h wound around the teeth T9 to T12. The four fifth output windings 11h are connected in series. The sixth output winding group 12i is formed by four sixth output windings 11i wound around the teeth T9 to T12. The four sixth output windings 11i are connected in series.

The control unit 6 according to embodiment 4 includes a first exciting circuit 13, a first angle calculating unit 14, a second exciting circuit 15, a second angle calculating unit 16, a third exciting circuit 17, and a third angle calculating unit 18. First excitation circuit 13, second excitation circuit 15 and third excitation circuit 17 are independent of one another.

The third excitation circuit 17 and the third angle calculation unit 18 belong to a third system.

The third excitation winding group 12g is electrically connected to the third excitation circuit 17 via an excitation terminal. The fifth output winding group 12h and the sixth output winding group 12i are electrically connected to the third angle arithmetic unit 18 via output terminals.

The third angle calculation unit 18 calculates and outputs a third system detection angle θ 3 of the rotor 7 based on the output signals from the fifth and sixth output winding groups 12h and 12 i.

Fig. 13 is an explanatory diagram showing the distribution of the number of turns of the first excitation winding 11a, the second excitation winding 11d, and the third excitation winding 11g according to embodiment 4. The number of turns of the first excitation winding 11a, the second excitation winding 11d, and the third excitation winding 11g is continuously shown in fig. 13.

In the first to third excitation windings 11a, 11d, and 11g of embodiment 4, two windings in the winding direction "+" and two windings in the winding direction "-" are alternately arranged in the circumferential direction of the stator core 9.

Further, the winding directions of the first and second excitation windings 11a and 11d adjacent to each other in the circumferential direction of the stator core 9 are the same. Further, the winding directions of the second excitation winding 11d and the third excitation winding 11g adjacent to each other in the circumferential direction of the stator core 9 are the same. Further, the winding directions of the third excitation winding 11g and the first excitation winding 11a adjacent to each other in the circumferential direction of the stator core 9 are the same.

That is, in fig. 13, the winding direction of the first excitation winding 11a of the tooth T1 is the same as the winding direction of the third excitation winding 11g of the tooth T12. Further, the winding direction of the first excitation winding 11a of the tooth T4 is the same as the winding direction of the second excitation winding 11d of the tooth T5. Further, the winding direction of the second excitation winding 11d of the tooth T8 is the same as the winding direction of the third excitation winding 11g of the tooth T9.

Therefore, the direction of the magnetic flux generated in the tooth T1 is the same as the direction of the magnetic flux generated in the tooth T12. Further, the direction of the magnetic flux generated in the tooth T4 is the same as the direction of the magnetic flux generated in the tooth T5. Further, the direction of the magnetic flux generated in the tooth T8 is the same as the direction of the magnetic flux generated in the tooth T9. The other structure is the same as embodiment 1.

Thus, even in a redundant resolver device of a triple system, an increase in the axial dimension of the resolver body and a decrease in the angle detection accuracy due to redundancy can be suppressed.

Further, in embodiment 4, the first end portion excitation winding and the second end portion excitation winding may be wound in opposite directions to each other. In this case, as in embodiment 3, the connection direction in which the first end portion excitation winding is connected to the corresponding excitation circuit may be opposite to the connection direction in which the second end portion excitation winding is connected to the corresponding excitation circuit.

Embodiment 5.

Next, fig. 14 is a sectional view showing a stator of a redundant resolver device according to embodiment 5 of the present invention. In embodiment 5, the stator core 9 is divided into two in the circumferential direction. That is, stator core 9 is formed by combining two arc-shaped divided cores 9A. Fig. 15 is a plan view showing the division core 9A in fig. 14. The other structure is the same as that of any of embodiments 1 to 4.

In such a configuration, the winding operation is facilitated by winding the winding around the teeth 9b before the two divided cores 9A are combined, and the manufacturability can be improved.

Embodiment 6.

Next, fig. 16 is a sectional view showing a stator of a redundant resolver device according to embodiment 6 of the present invention. In embodiment 6, the stator core 9 is divided into four segments in the circumferential direction. That is, stator core 9 is formed by combining four arc-shaped divided cores 9B. Fig. 17 is a plan view showing the division core 9B in fig. 16. The other structure is the same as that of any of embodiments 1 to 4.

In such a configuration, the winding operation is facilitated by winding the winding around the teeth 9B before the four divided cores 9B are combined, and the manufacturability can be improved.

Here, the stator core 9 as shown in embodiments 1 to 6 is configured by laminating a plurality of core pieces formed of electromagnetic steel plates in the axial direction. Therefore, as shown in fig. 18, the stator core 9 according to embodiments 1 to 4 uses an annular core sheet 22 punched out from a core sheet 21.

On the other hand, as shown in fig. 19, in stator core 9 according to embodiment 6, arc-shaped core pieces 23 punched out from core sheet 21 are used.

The size of the core sheet 23 of embodiment 6 is smaller than the size of the core sheets 22 of embodiments 1 to 4. Therefore, in embodiment 6, compared to embodiments 1 to 4, a coil having a smaller width can be used as the core sheet 21, and the yield can be improved.

Further, in embodiment 6, the influence of the magnetic anisotropy of the electromagnetic steel plates constituting the stator core 9 can be reduced, and the angle detection accuracy can be improved.

The number of division of the stator core 9 in the circumferential direction is not limited to 2 or 4, and may be 3 or 5 or more, for example.

Embodiment 7.

Next, fig. 20 is a sectional view showing the stator core 9 of the redundant resolver device according to embodiment 7 of the present invention. Stator core 9 according to embodiment 7 is formed of core blocks 24 having the same number of teeth 9 b.

The core blocks 24 adjacent to each other are rotatably coupled by the coupling portions 25. Therefore, the stator core 9 can be deformed between a state in which the core blocks 24 are arranged in a circular ring shape as shown in fig. 20 and a state in which the core blocks 24 are linearly spread as shown in fig. 21. The other structure is the same as that of any of embodiments 1 to 4.

In this structure, the stator core 9 is linearly developed, so that the gap between the adjacent teeth 9b becomes large. By performing the winding operation of the winding in this state, the winding operation becomes easy, and the manufacturability can be improved.

The core pieces constituting the rotor core may be punched from the same electromagnetic steel sheets as the core pieces constituting the stator core.

In the above example, the redundant resolver devices of two systems and three systems are shown, but four or more systems may be used.

In the above example, the number of grooves is 12 and the axial multiple angle is 5, but the present invention is not limited thereto, and similar effects can be obtained with other configurations.

Further, in the above example, the one-phase excitation winding and the two-phase output winding are wound side by side in the circumferential direction, but not limited thereto. For example, even if the one-phase excitation winding and the two-phase output winding are arranged in the radial direction, or the order of winding on each tooth is changed, the same effect can be obtained.

The redundant resolver devices according to embodiments 1 to 7 can be applied to an electric power steering device.

Fig. 22 is a side view showing an example of an electric power steering apparatus to which the redundant resolver apparatus of the present invention is applied. The electric power steering apparatus 100 includes an electric drive apparatus 101 and a gear box unit 102.

The electric drive device 101 includes a rotating electric machine 1, an ECU (electronic control unit) 103, and the redundant resolver device 4 described in any one of embodiments 1 to 7. The rotating electric machine 1 in the electric power steering apparatus 100 is an electric motor. Although not shown in fig. 22, the redundant resolver device 4 is mounted on the rotating shaft 3 of the rotating electrical machine 1.

The ECU103 is provided with a first connector 103a, a second connector 103b, and a power supply connector 103 c. The ECU103 is supplied with power from a battery or an alternator through the power supply connector 103 c.

The gear box portion 102 is mounted to the housing 104. The gear box portion 102 incorporates a belt, not shown, and a ball screw, not shown. A rack shaft, not shown, is provided in the housing 104.

The gear box portion 102 decelerates the rotation of the rotating electric machine 1 and transmits the rotation to the rack shaft. The rotating electric machine 1 is disposed parallel to the rack shaft.

When a steering wheel, not shown, is steered by a driver, its torque is transmitted to the input shaft 105 through a steering shaft, not shown. The torque transmitted to the input shaft 105 is detected by a torque sensor 106.

The torque detected by the torque sensor 106 is converted into an electric signal, and is input to the first connector 103a via a cable, not shown. On the other hand, the car information including the vehicle speed information is converted into an electric signal and input to the second connector 103 b.

The ECU103 calculates a required assist torque based on the signal from the torque sensor 106 and the vehicle information, and supplies a current corresponding to the assist torque to the rotating electric machine 1 through the inverter.

The torque generated in the rotary electric machine 1 is input to the rack shaft through the gear box portion 102 as a thrust force that moves the rack shaft in the arrow d direction in fig. 22. Accordingly, the pair of tie rods 107 moves, and the pair of tires, not shown, turns, thereby enabling the vehicle to turn.

As a result, the driver can turn the vehicle with a small steering force, assisted by the torque of the rotating electric machine 1. A pair of rack guards 108 are provided at both ends of the housing 104. A pair of rack guards 108 inhibit the intrusion of foreign objects into the housing 104.

Description of the reference symbols

4 redundant resolver device, 5 resolver main body, 6 control part, 7 rotor, 8 stator, 9 stator core, 9A core back, 9B teeth, 9A, 9B split core, 11a first excitation winding, 11B first output winding, 11c second output winding, 11d second excitation winding, 11e third output winding (first output winding of second system), 11f fourth output winding (second output winding of second system), 11g third excitation winding, 11h fifth output winding (first output winding of third system), 11i sixth output winding (second output winding of third system), 12a first excitation winding group, 12B first output winding group, 12c second output winding group, 12d second excitation winding group, 12e third output winding group (first output winding group of second system), 12f a fourth output winding group (a second output winding group of the second system), 12g a third excitation winding group, 12h a fifth output winding group (a first output winding group of the third system), 12i a sixth output winding group (a second output winding group of the third system), 13 a first excitation circuit, 15 a second excitation circuit, 17 a third excitation circuit, 24 core blocks, 100 electric power steering devices.