阅读说明：本技术 8-6极开关磁阻电动机无放电制动方法 (8-6 pole switch reluctance motor non-discharge braking method ) 是由 乐宏林 王晨阳 于可浩 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种8-6极开关磁阻电动机无放电制动方法,属于开关磁阻电机领域。该8-6极开关磁阻电动机包括定子和转子,所述定子包括8个定子凸极,所述转子包括6个转子凸极,所述方法包括：当所述转子转动到一个转子凸极与一个定子凸极正对的位置时,将一相定子线圈通电产生与转动方向相同的电动扭矩,同时将另外两相定子线圈通电产生与转动方向相反的制动扭矩,所述制动扭矩大于电动扭矩。本发明无需外部耗能电路即可在任意转速下平稳安静的制动,并且体积小、成本低,安全性与可靠性高。(The invention discloses a non-discharge braking method for an 8-6-pole switched reluctance motor, and belongs to the field of switched reluctance motors. The 8-6 pole switched reluctance motor includes a stator including 8 stator salient poles and a rotor including 6 rotor salient poles, the method including: when the rotor rotates to a position where one rotor salient pole is opposite to one stator salient pole, one phase of stator coil is electrified to generate electric torque in the same direction as the rotation direction, and the other two phases of stator coils are electrified to generate braking torque opposite to the rotation direction, wherein the braking torque is larger than the electric torque. The invention can brake stably and quietly at any rotating speed without an external energy consumption circuit, and has small volume, low cost, high safety and reliability.)

1. An 8-6 pole switched reluctance motor discharge-less braking method, wherein the 8-6 pole switched reluctance motor includes a stator including 8 stator salient poles and a rotor including 6 rotor salient poles, the method comprising:

when the rotor rotates to a position where one rotor salient pole is opposite to one stator salient pole, one phase of stator coil is electrified to generate electric torque in the same direction as the rotation direction, and the other two phases of stator coils are electrified to generate braking torque opposite to the rotation direction, wherein the braking torque is larger than the electric torque.

2. The discharge-free braking method for an 8-6 pole switched reluctance motor according to claim 1, wherein when said rotor is rotated to a position where a salient pole of the rotor faces a salient pole of the stator, the stator coils of one phase located forward in the rotational direction of the position are energized to generate an electromotive torque in the same rotational direction as the rotational direction, and the stator coils of two phases located backward in the rotational direction of the position are energized to generate a braking torque opposite to the rotational direction, said braking torque being larger than the electromotive torque.

3. The discharge-less braking method of an 8-6 pole switched reluctance motor of claim 1, wherein the 6 rotor salient poles include a first rotor salient pole, a second rotor salient pole, a third rotor salient pole, a fourth rotor salient pole, a fifth rotor salient pole and a sixth rotor salient pole which are located on the rotor and arranged in a clockwise order;

the 8 stator salient poles comprise stator salient poles A, stator salient poles B, stator salient poles C, a fourth stator D, stator salient poles A1, stator salient poles B1, stator salient poles C1 and stator salient poles D1 which are positioned on the stator and are sequentially arranged clockwise;

the stator salient poles A and A1 are in phase A, the stator salient poles B and B1 are in phase B, the stator salient poles C and C1 are in phase C, and the stator salient poles D and D1 are in phase D.

4. The discharge-less braking method of an 8-6 pole switched reluctance motor according to claim 3, wherein the rotor rotates clockwise, wherein:

performing a first control action when the rotor rotates from a position where the first rotor salient pole faces the stator salient pole a to a position where the second rotor salient pole faces the stator salient pole C, the first control action including: controlling the stator coils of the phase D to be electrified to generate clockwise electric torque, and controlling the stator coils of the phase A and the phase B to be electrified to generate anticlockwise electric torque;

performing a second control action when the rotor rotates from a position where the second rotor salient pole faces the stator salient pole C to a position where the third rotor salient pole faces the stator salient pole a1, the second control action including: controlling the stator coils of the B phase to be electrified to generate clockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate anticlockwise electric torque;

performing a third control action when the rotor rotates from a position where the third rotor salient pole faces the stator salient pole a1 to a position where the fourth rotor salient pole faces the stator salient pole C1, the third control action including: controlling the stator coils of the phase D to be electrified to generate clockwise electric torque, and controlling the stator coils of the phase A and the phase B to be electrified to generate anticlockwise electric torque;

performing a fourth control action when the rotor rotates from a position where fourth rotor salient pole is directly opposed to stator salient pole C1 to a position where fifth rotor salient pole is directly opposed to stator salient pole a, the fourth control action including: controlling the stator coils of the B phase to be electrified to generate clockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate anticlockwise electric torque;

and in the same way, when the rotor rotates to the position where the rotor salient pole is opposite to the stator salient pole, the first control action to the fourth control action are executed in a circulating mode.

5. The discharge-less braking method of an 8-6 pole switched reluctance motor according to claim 3, wherein the rotor rotates counterclockwise, wherein:

performing a fifth control action when the rotor rotates from a position where the first rotor salient pole faces the stator salient pole B to a position where the third rotor salient pole faces the stator salient pole D, the fifth control action including: the stator coils of the phase C are controlled to be electrified to generate anticlockwise electric torque, and the stator coils of the phase A and the phase B are controlled to be electrified to generate clockwise braking torque;

performing a sixth control action when the rotor rotates from a position where the third rotor salient pole faces the stator salient pole D to a position where the fifth rotor salient pole faces the stator salient pole B1, the sixth control action including: controlling the stator coils of the A phase to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate clockwise braking torque;

performing a seventh control action when the rotor rotates from a position where fifth rotor salient pole is directly opposed to stator salient pole B1 to a position where first rotor salient pole is directly opposed to stator salient pole D1, the seventh control action including: the stator coils of the phase C are controlled to be electrified to generate anticlockwise electric torque, and the stator coils of the phase A and the phase B are controlled to be electrified to generate clockwise braking torque;

performing an eighth control action when the rotor rotates from a position where first rotor salient pole is directly opposed to stator salient pole D1 to a position where third rotor salient pole is directly opposed to stator salient pole B, the eighth control action including: controlling the stator coils of the A phase to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate clockwise braking torque;

and in the same way, when the rotor rotates to the position where the rotor salient pole is opposite to the stator salient pole, the fifth control action to the eighth control action are executed in a circulating mode.

6. The discharge-less braking method of an 8-6 pole switched reluctance motor according to any one of claims 1 to 5, wherein the relative positions of the rotor salient poles and the stator salient poles are obtained by a position sensor, and the braking torque and the motoring torque are generated by controlling the stator coils by a controller.

7. The discharge-free braking method for the 8-6 pole switched reluctance motor according to claim 6, wherein the braking torque and the motoring torque are precisely controlled by controlling the magnitude of the current of the stator coil through the controller.

8. The 8-6 pole switched reluctance motor discharge-less braking method of claim 6, further comprising:

the controller controls the current of the stator coil and the electrifying time of the stator coil according to the rotating speed of the rotor.

Technical Field

The invention relates to the field of switched reluctance motors, in particular to a non-discharge braking method for an 8-6-pole switched reluctance motor.

Background

The switched reluctance motor is a new speed regulating motor, and is a latest generation speed regulating system of a relay frequency conversion speed regulating system and a brushless direct current motor speed regulating system. Its simple structure is firm, and the speed governing scope is wide, and system reliability is high. At present, the application and development of the switched reluctance motor make obvious progress, and the switched reluctance motor is successfully applied to various fields such as electric vehicle driving, general industry, household appliances, textile machinery and the like. The 8-6 pole switch reluctance motor is a switch reluctance motor with 8-level stator and 6-level rotor.

When the conventional 8-6 pole switched reluctance motor is braked, the motor is braked by pure negative torque, and an external energy consumption circuit is utilized to consume the electric energy generated by the brake. When the motor needs to be braked, the controller is used for controlling the on-off of the corresponding coil according to the relative position of the stator and the rotor of the motor, so that the motor generates negative torque, and the aim of braking the motor is fulfilled by using simple negative torque.

At the moment, the rotor of the motor does cutting magnetic induction line motion and is in a power generation state, generated electric energy is stored in the energy storage capacitor through the power circuit, and in order to guarantee the electrical safety of the power circuit and the energy storage capacitor, the electric energy generated in braking needs to be released through an external energy consumption circuit. Because the external energy consumption circuit is added, the reliability and the safety of the controller are reduced, and the volume and the cost of the controller are increased. If an external energy consumption circuit is not arranged for discharging, the motor is braked by controlling the on-off of a specific coil through a power circuit, so that the instantaneous current is large during braking, abnormal sound is generated at high speed, and meanwhile, the noise is large and the vibration is serious.

Disclosure of Invention

In order to solve the technical problems, the invention provides a non-discharge braking method for an 8-6 pole switch reluctance motor, which can perform stable and quiet braking at any rotating speed without an external energy consumption circuit, and has the advantages of small volume, low cost, high safety and high reliability.

The technical scheme provided by the invention is as follows:

an 8-6 pole switched reluctance motor discharge-less braking method, the 8-6 pole switched reluctance motor including a stator including 8 stator salient poles and a rotor including 6 rotor salient poles, the method comprising:

when the rotor rotates to a position where one rotor salient pole is opposite to one stator salient pole, one phase of stator coil is electrified to generate electric torque in the same direction as the rotation direction, and the other two phases of stator coils are electrified to generate braking torque opposite to the rotation direction, wherein the braking torque is larger than the electric torque.

Further, when the rotor rotates to a position where a rotor salient pole faces a stator salient pole, the stator coil of one phase in front of the position in the rotating direction is electrified to generate electric torque the same as the rotating direction, and the stator coils of two phases in back of the position in the rotating direction are electrified to generate braking torque opposite to the rotating direction, wherein the braking torque is larger than the electric torque.

Further, the 6 rotor salient poles comprise a first rotor salient pole, a second rotor salient pole, a third rotor salient pole, a fourth rotor salient pole, a fifth rotor salient pole and a sixth rotor salient pole which are positioned on the rotor and are arranged in a clockwise sequence;

the 8 stator salient poles comprise stator salient poles A, stator salient poles B, stator salient poles C, a fourth stator D, stator salient poles A1, stator salient poles B1, stator salient poles C1 and stator salient poles D1 which are positioned on the stator and are sequentially arranged clockwise;

the stator salient poles A and A1 are in phase A, the stator salient poles B and B1 are in phase B, the stator salient poles C and C1 are in phase C, and the stator salient poles D and D1 are in phase D.

Further, the rotor rotates clockwise, wherein:

performing a first control action when the rotor rotates from a position where the first rotor salient pole faces the stator salient pole a to a position where the second rotor salient pole faces the stator salient pole C, the first control action including: controlling the stator coils of the phase D to be electrified to generate clockwise electric torque, and controlling the stator coils of the phase A and the phase B to be electrified to generate anticlockwise electric torque;

performing a second control action when the rotor rotates from a position where the second rotor salient pole faces the stator salient pole C to a position where the third rotor salient pole faces the stator salient pole a1, the second control action including: controlling the stator coils of the B phase to be electrified to generate clockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate anticlockwise electric torque;

performing a third control action when the rotor rotates from a position where the third rotor salient pole faces the stator salient pole a1 to a position where the fourth rotor salient pole faces the stator salient pole C1, the third control action including: controlling the stator coils of the phase D to be electrified to generate clockwise electric torque, and controlling the stator coils of the phase A and the phase B to be electrified to generate anticlockwise electric torque;

performing a fourth control action when the rotor rotates from a position where fourth rotor salient pole is directly opposed to stator salient pole C1 to a position where fifth rotor salient pole is directly opposed to stator salient pole a, the fourth control action including: controlling the stator coils of the B phase to be electrified to generate clockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate anticlockwise electric torque;

and in the same way, when the rotor rotates to the position where the rotor salient pole is opposite to the stator salient pole, the first control action to the fourth control action are executed in a circulating mode.

Further, the rotor rotates counterclockwise, wherein:

performing a fifth control action when the rotor rotates from a position where the first rotor salient pole faces the stator salient pole B to a position where the third rotor salient pole faces the stator salient pole D, the fifth control action including: the stator coils of the phase C are controlled to be electrified to generate anticlockwise electric torque, and the stator coils of the phase A and the phase B are controlled to be electrified to generate clockwise braking torque;

performing a sixth control action when the rotor rotates from a position where the third rotor salient pole faces the stator salient pole D to a position where the fifth rotor salient pole faces the stator salient pole B1, the sixth control action including: controlling the stator coils of the A phase to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate clockwise braking torque;

performing a seventh control action when the rotor rotates from a position where fifth rotor salient pole is directly opposed to stator salient pole B1 to a position where first rotor salient pole is directly opposed to stator salient pole D1, the seventh control action including: the stator coils of the phase C are controlled to be electrified to generate anticlockwise electric torque, and the stator coils of the phase A and the phase B are controlled to be electrified to generate clockwise braking torque;

performing an eighth control action when the rotor rotates from a position where first rotor salient pole is directly opposed to stator salient pole D1 to a position where third rotor salient pole is directly opposed to stator salient pole B, the eighth control action including: controlling the stator coils of the A phase to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate clockwise braking torque;

and in the same way, when the rotor rotates to the position where the rotor salient pole is opposite to the stator salient pole, the fifth control action to the eighth control action are executed in a circulating mode.

Further, the relative position of the salient poles of the rotor and the salient poles of the stator is obtained through a position sensor, and the stator coils are controlled to generate braking torque and electric torque through a controller.

Furthermore, the current of the stator coil is controlled by the controller, so that the braking torque and the electric torque are accurately controlled.

Further, the method further comprises:

the controller controls the current of the stator coil and the electrifying time of the stator coil according to the rotating speed of the rotor.

The invention has the following beneficial effects:

the electric and braking are controlled simultaneously, the electric energy generated by the electric hedging brake is utilized, the electric energy generated in the brake can be released without discharging of an external energy consumption circuit, and meanwhile, the braking torque is larger than the electric torque, so that the brake is realized. The invention can make the 8-6 pole switch reluctance motor brake stably at any rotating speed without abnormal sound and vibration, and has small noise, no need of external energy consumption circuit, saved cost, reduced volume and improved system safety and reliability.

Drawings

Fig. 1 to 6 are schematic views of the relative positions of the rotor and the stator of the 8-6 pole switched reluctance motor of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

An embodiment of the present invention provides a discharge-free braking method for an 8-6 pole switched reluctance motor, as shown in fig. 1-6, the 8-6 pole switched reluctance motor includes a stator 100 and a rotor 200, the stator 100 includes 8 stator salient poles (A, B, C, D, A1, B1, C1, D1), the rotor 200 includes 6 rotor salient poles (1, 2, 3, 4, 5, 6), and the method includes:

when the rotor 200 rotates to a position where one rotor salient pole faces one stator salient pole, one phase of stator coil is electrified to generate an electric torque in the same direction as the rotation direction, and the other two phases of stator coils are electrified to generate a braking torque opposite to the rotation direction, wherein the braking torque is larger than the electric torque.

The electric and braking are controlled simultaneously, the electric energy generated by the electric hedging brake is utilized, the electric energy generated in the brake can be released without discharging of an external energy consumption circuit, and meanwhile, the braking torque is larger than the electric torque, so that the brake is realized. The invention can make the 8-6 pole switch reluctance motor brake stably at any rotating speed without abnormal sound and vibration, and has small noise, no need of external energy consumption circuit, saved cost, reduced volume and improved system safety and reliability.

In one example, when the rotor 200 is rotated to a position where one rotor salient pole faces one stator salient pole, the stator coil located in one phase in front of the position in the rotation direction (i.e. the position where the rotor salient pole faces the stator salient pole) is electrified to generate the electric torque in the same direction as the rotation direction, and the stator coils located in two phases behind the position in the rotation direction are electrified to generate the braking torque opposite to the rotation direction, wherein the braking torque is larger than the electric torque.

Specifically, the aforementioned 6 rotor salient poles include a first rotor salient pole 1, a second rotor salient pole 2, a third rotor salient pole 3, a fourth rotor salient pole 4, a fifth rotor salient pole 5, and a sixth rotor salient pole 6, which are located on the rotor 200 and arranged in order clockwise.

The 8 stator salient poles include a stator salient pole a, a stator salient pole B, a stator salient pole C, a fourth stator D, a stator salient pole a1, a stator salient pole B1, a stator salient pole C1, and a stator salient pole D1 which are positioned on the stator 100 and arranged in order clockwise.

The stator salient pole A and the stator salient pole A1 are in A phase, the stator salient pole B and the stator salient pole B1 are in B phase, the stator salient pole C and the stator salient pole C1 are in C phase, and the stator salient pole D1 are in D phase.

When the rotor rotates clockwise:

when the rotor 200 rotates from a position where the first rotor salient pole 1 faces the stator salient pole a (as shown in fig. 1) to a position where the second rotor salient pole 2 faces the stator salient pole C (as shown in fig. 2), a first control action is performed, the first control action including: and controlling the energization of the stator coils of the phase D to generate clockwise electric torque, and controlling the energization of the stator coils of the phase A and the phase B to generate anticlockwise electric torque, so that the electric operation and the braking operation are simultaneously performed.

When rotor 200 rotates from a position where second rotor salient pole 2 faces stator salient pole C (shown in fig. 2) to a position where third rotor salient pole 3 faces stator salient pole a1 (shown in fig. 3), a second control action is performed, which includes: and controlling the stator coils of the B phase to be electrified to generate clockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate anticlockwise electric torque, so that electric operation and braking are simultaneously performed.

Similarly, when the rotor 200 rotates from a position where the third rotor salient pole 3 faces the stator salient pole a1 to a position where the fourth rotor salient pole 4 faces the stator salient pole C1, a third control action is performed, the third control action including: and controlling the energization of the stator coils of the phase D to generate clockwise electric torque, and controlling the energization of the stator coils of the phase A and the phase B to generate anticlockwise electric torque.

When rotor 200 rotates from a position where fourth rotor salient pole 4 faces stator salient pole C1 to a position where fifth rotor salient pole 5 faces stator salient pole a, a fourth control action is performed, which includes: and controlling the stator coils of the B phase to be electrified to generate clockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate anticlockwise electric torque.

The braking action of one period is completed, and by analogy, the first control action to the fourth control action are executed in a circulating mode every time the rotor rotates to the position where the rotor salient pole is opposite to the stator salient pole. That is, according to the relative position of the stator and the rotor, the coils on the three phases of the motors A, B, D and B, C, D are respectively controlled to be electrified, and accurate braking is carried out.

When the rotor rotates anticlockwise:

when the rotor 200 rotates from a position where the first rotor salient pole 1 faces the stator salient pole B (as shown in fig. 4) to a position where the third rotor salient pole 3 faces the stator salient pole D (as shown in fig. 5), fifth control actions are performed, the fifth control actions including: and controlling the stator coils of the phase C to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the phase A and the phase B to be electrified to generate clockwise braking torque.

When rotor 200 rotates from a position where third rotor salient pole 3 faces stator salient pole D (as shown in fig. 5) to a position where fifth rotor salient pole 5 faces stator salient pole B1 (as shown in fig. 6), a sixth control action is performed, which includes: and controlling the stator coils of the A phase to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate clockwise braking torque.

Similarly, when the rotor 200 rotates from the position where the fifth rotor salient pole 5 faces the stator salient pole B1 to the position where the first rotor salient pole 1 faces the stator salient pole D1, a seventh control action is performed, which includes: and controlling the stator coils of the phase C to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the phase A and the phase B to be electrified to generate clockwise braking torque.

When the rotor 200 rotates from a position where the first rotor salient pole 1 faces the stator salient pole D1 to a position where the third rotor salient pole 3 faces the stator salient pole B, an eighth control action is performed, the eighth control action including: and controlling the stator coils of the A phase to be electrified to generate anticlockwise electric torque, and controlling the stator coils of the C phase and the D phase to be electrified to generate clockwise braking torque.

The above-described braking operation for one cycle is completed, and so on, and every time the rotor 200 rotates to the position where the rotor salient pole faces the stator salient pole, the fifth control operation to the eighth control operation are cyclically executed. Namely, the coils on three phases of the motors A, B, C and A, C, D are respectively controlled to be electrified according to the relative position of the stator and the rotor, so that accurate braking is performed.

In the invention, the relative position of the rotor salient pole and the stator salient pole can be obtained through the position sensor, and the on-off of the three-phase coil is controlled through the controller, so that the stator coil is controlled to generate braking torque and electric torque.

During braking (namely, during the execution of the first control action to the fourth control action), the controller controls the current of the stator coil on the corresponding electromotive phase and the braking phase through an algorithm, so that the braking torque and the electromotive torque are accurately controlled, and the braking is smooth and quiet.

The method of the present invention further comprises:

the controller controls the current of the stator coil and the electrifying time of the stator coil through program calculation according to the current rotating speed of the rotor, namely, the force and the braking time required by braking are controlled, so that the motor can brake stably in each rotating speed section.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.