阅读说明：本技术 一种电机电磁刹车的控制电路 (Control circuit of motor electromagnetic brake ) 是由 陈予吒 邱铧 高宏 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种电机电磁刹车的控制电路,包括电机本体、电阻损耗电路、三相绕组电路、电源、电控系统、开关；所述电阻损耗电路包括第七场效应晶体管、电阻,所述电阻的一端与开关的一端连接,所述电阻的另一端与第七场效应晶体管的漏极连接,所述第七场效应晶体管的源极与电源的负极连接。本发明是通反馈给电控系统的电机速度来确认电机的能量,然后通过电控系统来控制电阻损耗电路和三相绕组电路的工作时间,这两种电路还能够交替运行,这样即可以减小损耗电阻的大小,又可以保护电机的绕组不会烧坏,在刹车时长超出预计时,还可使用点刹功能,保证了刹车的安全性,并且无需额外的刹车系统,更加方便快捷,节约成本。(The invention discloses a control circuit of an electromagnetic brake of a motor, which comprises a motor body, a resistance loss circuit, a three-phase winding circuit, a power supply, an electric control system and a switch, wherein the resistance loss circuit is connected with the three-phase winding circuit; the resistance loss circuit comprises a seventh field effect transistor and a resistor, one end of the resistor is connected with one end of the switch, the other end of the resistor is connected with the drain electrode of the seventh field effect transistor, and the source electrode of the seventh field effect transistor is connected with the negative electrode of the power supply. The invention confirms the energy of the motor by the motor speed fed back to the electric control system, then controls the working time of the resistance loss circuit and the three-phase winding circuit by the electric control system, and the two circuits can alternately run, thereby reducing the size of the loss resistance, protecting the winding of the motor from being burnt out, using the inching function when the braking duration exceeds the preset time, ensuring the braking safety, needing no additional braking system, being more convenient and faster and saving the cost.)

1. A control circuit of a motor electromagnetic brake is characterized by comprising a motor body, a resistance loss circuit, a three-phase winding circuit, a power supply (DC), an electric control system and a switch (S);

a switch (S) is arranged at the positive end of the power supply (DC);

the resistance loss circuit comprises a seventh field effect transistor (Q7) and a resistor (R1), wherein one end of the resistor (R1) is connected with one end of the switch (S), the other end of the resistor (R1) is connected with the drain electrode of the seventh field effect transistor (Q7), and the source electrode of the seventh field effect transistor (Q7) is connected with the negative electrode of the power supply (DC);

the three-phase winding circuit comprises a first field effect transistor (Q1), a second field effect transistor (Q2), a third field effect transistor (Q3), a fourth field effect transistor (Q4), a fifth field effect transistor (Q5) and a sixth field effect transistor (Q6), wherein the drain electrode of the first field effect transistor (Q1) is connected with one end of a switch (S), the source electrode of the first field effect transistor (Q1) is connected with the drain electrode of the second field effect transistor (Q2), and the source electrode of the second field effect transistor (Q2) is connected with the negative electrode of a power supply (DC); the drain of the third field effect transistor (Q3) is connected with one end of the switch (S), the source of the third field effect transistor (Q3) is connected with the drain of the fourth field effect transistor (Q4), and the source of the fourth field effect transistor (Q4) is connected with the negative pole of the power supply (DC); the drain electrode of the fifth field effect transistor (Q5) is connected with one end of the switch (S), the source electrode of the fifth field effect transistor (Q5) is connected with the drain electrode of the sixth field effect transistor (Q6), and the source electrode of the sixth field effect transistor (Q6) is connected with the negative electrode of the power supply (DC);

the motor body comprises a three-phase winding (T), a wire is arranged between the source electrode of the first field effect transistor (Q1) and the drain electrode of the second field effect transistor (Q2) and connected to the W end of the three-phase winding (T), a wire is arranged between the source electrode of the third field effect transistor (Q3) and the drain electrode of the fourth field effect transistor (Q4) and connected to the V end of the three-phase winding (T), and a wire is arranged between the source electrode of the fifth field effect transistor (Q5) and the drain electrode of the sixth field effect transistor (Q6) and connected to the U end of the three-phase winding (T).

2. The control circuit of an electric motor electromagnetic brake as claimed in claim 1, characterized in that the electric control system is electrically connected with the gate of the second field effect transistor (Q2), the gate of the fourth field effect transistor (Q4), the gate of the sixth field effect transistor (Q6) and the gate of the seventh field effect transistor (Q7).

3. The control circuit of an electromagnetic brake of an electric motor according to claim 1, characterized in that a capacitor (C1) is provided in the control circuit, one end of the capacitor (C1) is connected to the positive pole of the power supply (DC), and the other end of the capacitor (C1) is connected to the negative pole of the power supply (DC).

4. Control circuit of an electromechanical electromagnetic brake, in accordance with claim 1, characterized in that said switch (S) is a relay.

5. Control circuit for an electromagnetic brake of an electric machine according to claim 1, characterized in that the negative pole of said power supply (DC) is connected to ground.

6. The control circuit of the motor electromagnetic brake as claimed in claim 1, wherein the motor body is capable of feeding back the speed of the motor to the electronic control system.

7. Control circuit for an electromagnetic brake of an electric machine, according to claim 1, characterized in that said power supply (DC) supplies direct current.

Technical Field

The invention relates to the field of control of motor equipment, in particular to a control circuit of a motor electromagnetic brake.

Background

In the process of motor deceleration, the motor is in a power generation state, and redundant electricity is consumed or energy recovery is carried out. The current common method is to consume energy. At present, the energy consumption mode is processed by an external mechanical brake, or redundant energy is consumed by a resistor, and energy is consumed by short-circuiting a three-phase winding of the motor. Need dispose extra braking system through the outside brake, direct through the resistance energy consumption, then need calculate its required resistance size of work according to the maximum energy, if adopt the short circuit of three-phase winding to consume, then at high speed, its short circuit current can be very big, the duration overlength can burn out the motor, like the electric wheelchair electromagnetic brake control circuit that CN209692655U disclosed, open the mode that the brake low pressure maintains the brake through the high pressure and reduce the brake power consumption, this kind of design is suitable for on the motor braking system that the rotational speed is not high, when the motor rotational speed is very high, the effect of brake will greatly reduced, consequently, need design a new braking system to solve above-mentioned problem.

Disclosure of Invention

The present invention is directed to a control circuit for an electromagnetic brake of a motor, so as to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a control circuit of a motor electromagnetic brake comprises a motor body, a resistance loss circuit, a three-phase winding circuit, a power supply, an electric control system and a switch;

a switch is arranged at the positive end of the power supply;

the resistance loss circuit comprises a seventh field effect transistor and a resistor, one end of the resistor is connected with one end of the switch, the other end of the resistor is connected with the drain electrode of the seventh field effect transistor, and the source electrode of the seventh field effect transistor is connected with the negative electrode of the power supply;

the three-phase winding circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor and a sixth field effect transistor, wherein the drain electrode of the first field effect transistor is connected with one end of the switch, the source electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor, and the source electrode of the second field effect transistor is connected with the negative electrode of the power supply; the drain electrode of the third field effect transistor is connected with one end of the switch, the source electrode of the third field effect transistor is connected with the drain electrode of the fourth field effect transistor, and the source electrode of the fourth field effect transistor is connected with the negative electrode of the power supply; the drain electrode of the fifth field effect transistor is connected with one end of the switch, the source electrode of the fifth field effect transistor is connected with the drain electrode of the sixth field effect transistor, and the source electrode of the sixth field effect transistor is connected with the negative electrode of the power supply;

the motor body comprises a three-phase winding, a lead is arranged between a source electrode of the first field effect transistor and a drain electrode of the second field effect transistor and connected to a first phase of the three-phase winding, a lead is arranged between a source electrode of the third field effect transistor and a drain electrode of the fourth field effect transistor and connected to a second phase of the three-phase winding, and a lead is arranged between a source electrode of the fifth field effect transistor and a drain electrode of the sixth field effect transistor and connected to a third phase of the three-phase winding.

Preferably, the electric control system is electrically connected with the grid electrode of the second field effect transistor, the grid electrode of the fourth field effect transistor, the grid electrode of the sixth field effect transistor and the grid electrode of the seventh field effect transistor.

Preferably, a capacitor is arranged in the control circuit, one end of the capacitor is connected with the positive pole of the power supply, and the other end of the capacitor is connected with the negative pole of the power supply.

Preferably, the switch is a relay.

Preferably, the negative pole of the power supply is grounded.

Preferably, the motor body can feed back the speed of the motor to the electronic control system.

Preferably, the power supply provides direct current.

Compared with the prior art, the invention has the beneficial effects that: the invention confirms the energy of the motor by the motor speed fed back to the electric control system, then controls the working time of the resistance loss circuit and the three-phase winding circuit by the electric control system, and the two circuits can alternately run, thereby reducing the size of the loss resistance, protecting the winding of the motor from being burnt out, using the inching function when the braking duration exceeds the preset time, ensuring the braking safety, needing no additional braking system, being more convenient and faster and saving the cost.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, a control circuit for an electromagnetic brake of a motor includes a motor body, a resistive loss circuit, a three-phase winding circuit, a power supply DC, and an electric control system switch S;

a switch S is arranged at the positive end of the power supply DC;

the resistance loss circuit comprises a seventh field effect transistor Q7 and a resistor R1, wherein one end of the resistor R1 is connected with one end of a switch S, the other end of the resistor R1 is connected with the drain electrode of the seventh field effect transistor Q7, and the source electrode of the seventh field effect transistor Q7 is connected with the negative electrode of the power supply DC;

the three-phase winding circuit comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, a fifth field effect transistor Q5 and a sixth field effect transistor Q6, wherein the drain electrode of the first field effect transistor Q1 is connected with one end of a switch S, the source electrode of the first field effect transistor Q1 is connected with the drain electrode of the second field effect transistor Q2, and the source electrode of the second field effect transistor Q2 is connected with the negative electrode of a power supply DC; the drain electrode of the third field effect transistor Q3 is connected with one end of the switch S, the source electrode of the third field effect transistor Q3 is connected with the drain electrode of the fourth field effect transistor Q4, and the source electrode of the fourth field effect transistor Q4 is connected with the negative electrode of the power supply DC; the drain electrode of the fifth field effect transistor Q5 is connected with one end of the switch S, the source electrode of the fifth field effect transistor Q5 is connected with the drain electrode of the sixth field effect transistor Q6, and the source electrode of the sixth field effect transistor Q6 is connected with the negative electrode of the power supply DC;

the motor body comprises a three-phase winding T, a lead is arranged between the source electrode of the first field effect transistor Q1 and the drain electrode of the second field effect transistor Q2 and connected to a first phase of the three-phase winding T, a lead is arranged between the source electrode of the third field effect transistor Q3 and the drain electrode of the fourth field effect transistor Q4 and connected to a second phase of the three-phase winding T, and a lead is arranged between the source electrode of the fifth field effect transistor Q5 and the drain electrode of the sixth field effect transistor Q6 and connected to a third phase of the three-phase winding T.

And the electric control system is electrically connected with the grid electrode of the second field effect transistor Q2, the grid electrode of the fourth field effect transistor Q4, the grid electrode of the sixth field effect transistor Q6 and the grid electrode of the seventh field effect transistor Q7.

The control circuit is provided with a capacitor C1, one end of the capacitor C1 is connected with the positive pole of the power supply DC, and the other end of the capacitor C1 is connected with the negative pole of the power supply DC.

The switch S adopts a relay.

The negative pole of the power supply DC is grounded.

The motor body can feed the speed of the motor back to the electric control system; the electric control system mainly has the functions of controlling the on-off of the field effect transistors Q1-Q6 according to the speed of the motor so as to control the rotating speed of the motor, and the other part of the functions of controlling the braking function of the motor by controlling the states of the field effect transistors Q2, Q4, Q6 and the seventh field effect transistor Q7.

The power supply DC provides direct current.

The working principle of the invention is as follows: when the electric control system detects that the speed of the fed-back motor is higher than the set speed, the PWM width controlled by the motor is firstly reduced, if the PWM width is reduced to 0, the speed of the motor is still higher than the set speed, and then the switch S is switched off to disconnect the battery from the motor control system. When the detected motor speed is higher than the set speed, firstly, the electric control system sends a high-level driving signal to the seventh field effect transistor Q7 to turn on the seventh field effect transistor Q7, the current directly passes through the resistor R1 and the seventh field effect transistor Q7, the turn-on time of the seventh field effect transistor Q7 is determined according to the power of the current-limiting resistor, and if the speed of the motor is limited to a set value within the turn-on time of the seventh field effect transistor Q7, the seventh field effect transistor Q7 is turned off; if the turn-on limit time of the seventh field effect transistor Q7 is exceeded, the electric control system simultaneously sends high level driving signals to the second field effect transistor Q2, the fourth field effect transistor Q4 and the sixth field effect transistor Q6, the second field effect transistor Q2, the fourth field effect transistor Q4 and the sixth field effect transistor Q6 are turned on for a short time, the current directly passes through the field effect transistors, the time for turning on the second field effect transistor Q2, the fourth field effect transistor Q4 and the sixth field effect transistor Q6 is determined according to the overcurrent capacity of the motor, the speed of the motor is reduced in the process of alternately turning on the seventh field effect transistor Q7, the second field effect transistor Q2, the fourth field effect transistor Q4 and the sixth field effect transistor Q6, if the accumulated time for alternately turning on the seventh field effect transistor Q7, the second field effect transistor Q2, the fourth field effect transistor Q4 and the sixth field effect transistor Q6 exceeds the set total braking time, the electronic control system will work in the snub mode, that is, the seventh field effect transistor Q7 will work intermittently until the motor reaches the set speed.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.