Power Topology of a Mutual Inductance Type Switched Reluctance Motor with an Auxiliary Excitation Winding

Abstract

The present invention relates to a mutual inductance type switched reluctance motor power topology with an auxiliary excitation winding, comprising: a DC power supply, a power supply filter capacitor connected in parallel with the DC power supply, a plurality of power switching tubes connected to the DC power supply, a plurality of diodes connected to each power switching tube, a plurality of auxiliary excitation windings connected between the power switching tubes, and a three-phase mutual inductance type switched reluctance motor connected between the power switching tubes. The present invention can control the working mode of the auxiliary excitation winding by switching on and off, exciting or cutting off the faulty armature structure, improving the output torque of the existing mutual inductance type switched reluctance motor while ensuring the reliability of system operation.

Description

Technical Field

[0001] The present invention relates to the technical field of motor manufacturing and control, and particularly to a mutual inductance type switched reluctance motor power topology structure with an auxiliary excitation winding. Background Art

[0002] As an electro-excited motor, the switched reluctance motor has a double salient pole structure formed by laminating ordinary silicon steel sheets for both its stator and rotor. There are neither permanent magnets nor windings on the rotor, and only concentrated winding coils on the stator, which operates based on the principle of "minimum magnetic reluctance". Due to its advantages such as simple structure, low cost, high reliability, and wide speed regulation range, it has received increasing attention and has developed rapidly with the progress of power electronics technology, modern microcomputer control technology, and computer-aided design technology.

[0003] Both the motor body and the power converter of the switched reluctance motor have the characteristics of being robust and reliable, basically requiring no maintenance, and having good adaptability to some special operating environments such as deep sea, high altitude, and large day-night temperature differences. Therefore, this type of motor not only shows strong competitiveness in the field of industrial speed regulation systems but also has broad prospects in aspects such as electric vehicles, household appliances, textile machinery, oil extraction, coke industry, and aerospace.

[0004] The switched reluctance motor system is a mechatronic device composed of a switched reluctance motor, a power converter, and a controller. The switched reluctance motor, the power converter, and the control strategy are closely related. The power converter is an important part of the switched reluctance motor drive system. The power converter outputs a periodic pulse current to the phase windings of the switched reluctance motor to drive the motor to operate. Its topology has various forms. Therefore, how to select the power converter topology from a system perspective to effectively improve efficiency and reduce the motor failure rate has become an urgent problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a mutual inductance type switched reluctance motor power topology structure with an auxiliary excitation winding, which can improve the output torque of the existing mutual inductance type switched reluctance motor and improve the system operation reliability at the same time.

[0006] The present invention is realized by the following technical solutions:

[0007] A mutual inductance type switched reluctance motor power topology with an auxiliary excitation winding, comprising: a DC power supply (V), a power supply filter capacitor (C) connected in parallel with the DC power supply (V), a plurality of power switches connected to the DC power supply (V), a plurality of diodes connected to each power switch, a plurality of auxiliary excitation windings connected between the power switches, and a three-phase mutual inductance type switched reluctance motor connected between the power switches. Specifically, it includes 15 power switches (T1 - T15), 13 diodes (D1 - D13), and 3 auxiliary excitation windings (F1 - F3), and the auxiliary excitation windings (F1 - F3) are connected in series. The three-phase mutual inductance type switched reluctance motor includes an A-phase winding, a B-phase winding, and a C-phase winding. One end of the A-phase winding is simultaneously connected to the emitter of the power switch (T1) and the collector of the power switch (T7). One end of the B-phase winding is simultaneously connected to the emitter of the power switch (T2) and the collector of the power switch (T8). One end of the C-phase winding is simultaneously connected to the emitter of the power switch (T3) and the collector of the power switch (T9). The other ends of the A-phase winding, B-phase winding, and C-phase winding are connected to one point.

[0008] According to the above technical solution, preferably, the positive pole of the DC power supply (V) is connected to the collectors of the power switches (T1 - T6), the negative pole of the DC power supply (V) is connected to the emitters of the power switches (T7 - T12), and the emitters of the power switches (T1 - T6) are connected to the collectors of the power switches (T7 - T12).

[0009] According to the above technical solution, preferably, a power switch (T13) is connected between the auxiliary excitation winding (F1) and the auxiliary excitation winding (F3), power switches (T14) and (T15) are connected between the auxiliary excitation winding (F1) and the auxiliary excitation winding (F2), the collector of the power switch (T14) is connected to the emitter of the power switch (T15), the emitter of the power switch (T14) is connected to the collector of the power switch (T15), and the diodes (D1 - D13) are respectively connected to the power switches (T1 - T13).

[0010] According to the above technical solution, preferably, one end of the auxiliary excitation winding (F1) is simultaneously connected to the emitter of the power switch tube (T4) and the collector of the power switch tube (T10), and the other end of the auxiliary excitation winding (F1) is simultaneously connected to the collector of the power switch tube (T13), the collector of the power switch tube (T14), and the emitter of the power switch tube (T15); one end of the auxiliary excitation winding (F2) is simultaneously connected to the emitters of the power switch tubes (T5) and (T14), the collector of the power switch tube (T11), and the collector of the power switch tube (T15), and the other end of the auxiliary excitation winding (F2) is simultaneously connected to the emitter of the power switch tube (T13) and one end of the auxiliary excitation winding (F3); the other end of the auxiliary excitation winding (F3) is simultaneously connected to the emitter of the power switch tube (T6) and the collector of the power switch tube (T12).

[0011] The beneficial effects of the present invention are as follows:

[0012] First, the mutual inductance type switched reluctance motor in the power topology structure provided by the present invention adopts bipolar power supply and works relying on the changes of self-inductance and mutual inductance. At any moment, two windings are energized simultaneously, improving the winding utilization rate of the switched reluctance motor.

[0013] Second, when the mutual inductance type switched reluctance motor operates normally without faults, the three auxiliary excitation windings are normally excited, thereby improving the output torque of the motor; when a fault occurs in the windings of the mutual inductance type switched reluctance motor, the on-off of the power switch tubes is controlled to cut off the faulty armature structure of the mutual inductance type switched reluctance motor, and the excitation working mode of the auxiliary excitation winding is changed to the armature working mode, so that the mutual inductance type switched reluctance motor operates normally, ensuring the operation reliability. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the power topology structure of the mutual inductance type switched reluctance motor of the present invention.

[0015] Figure 2 is a schematic diagram of the power topology structure of the present invention when the three-phase windings of the mutual inductance type switched reluctance motor operate normally.

[0016] Figure 3 is a schematic diagram of the power topology structure of the present invention when the three-phase windings of the mutual inductance type switched reluctance motor operate with faults. Detailed Embodiments

[0017] In order to enable those skilled in the art of the present technology to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the drawings and the best embodiments. Based on the embodiments of the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the invention.

[0018] In the description of the invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the invention.

[0019] Embodiment 1: The present invention includes a DC power supply V, a power supply filter capacitor C connected in parallel with the DC power supply V, a plurality of power switching tubes connected to the DC power supply V, a plurality of diodes connected to each power switching tube, a plurality of auxiliary excitation windings connected between the power switching tubes, and a three-phase mutual inductance type switched reluctance motor connected between the power switching tubes. Specifically, it includes 15 power switching tubes T1 - T15, 13 diodes D1 - D13, and 3 auxiliary excitation windings F1 - F3, and the auxiliary excitation windings F1 - F3 are connected in series. The positive pole of the DC power supply V is connected to the collectors of the 1st - 6th power switching tubes T1 - T6, the negative pole of the DC power supply V is connected to the emitters of the 7th - 12th power switching tubes T7 - T12, and the emitters of the 1st - 6th power switching tubes T1 - T6 are connected to the collectors of the 7th - 12th power switching tubes T7 - T12.

[0020] According to the above embodiment, preferably, the three-phase mutual inductance type switched reluctance motor includes an A-phase winding, a B-phase winding, and a C-phase winding. One end of the A-phase winding is simultaneously connected to the emitter of the 1st power switching tube T1 and the collector of the 7th power switching tube T7. One end of the B-phase winding is simultaneously connected to the emitter of the 2nd power switching tube T2 and the collector of the 8th power switching tube T8. One end of the C-phase winding is simultaneously connected to the emitter of the 3rd power switching tube T3 and the collector of the 9th power switching tube T9. The other ends of the A-phase winding, B-phase winding, and C-phase winding are connected to one point.

[0021] According to the above embodiments, preferably, a 13th power switch tube T13 is connected between the auxiliary excitation winding F1 and the auxiliary excitation winding F3, a 14th power switch tube T14 and a 15th power switch tube T15 are connected between the auxiliary excitation winding F1 and the auxiliary excitation winding F2, the collector of the 14th power switch tube T14 is connected to the emitter of the 15th power switch tube T15, and the emitter of the 14th power switch tube T14 is connected to the collector of the 15th power switch tube T15. The diodes D1 - D13 are respectively connected to the power switch tubes T1 - T13. Among them, the anodes of the 13 diodes D1 - D13 are respectively connected to the collectors of the 13 power switch tubes T1 - T13, and the cathodes of the 13 diodes D1 - D13 are respectively connected to the emitters of the 13 power switch tubes T1 - T13.

[0022] Embodiment 2: As Figure 1 shown, the present invention includes a DC power supply V, a power supply filter capacitor C connected in parallel with the DC power supply V, a plurality of power switch tubes connected to the DC power supply V, a plurality of diodes connected to each power switch tube, a plurality of auxiliary excitation windings connected between the power switch tubes, and a three - phase mutual - inductance type switched reluctance motor connected between the power switch tubes. The three - phase mutual - inductance type switched reluctance motor includes a phase - A winding, a phase - B winding, and a phase - C winding. Specifically, it includes 15 power switch tubes T1 - T15, 13 diodes D1 - D13, and 3 auxiliary excitation windings F1 - F3, and the auxiliary excitation windings F1 - F3 are connected in series. The positive pole of the DC power supply V is connected to the collectors of the 1st - 6th power switch tubes T1 - T6, the negative pole of the DC power supply V is connected to the emitters of the 7th - 12th power switch tubes T7 - T12, and the emitters of the 1st - 6th power switch tubes T1 - T6 are connected to the collectors of the 7th - 12th power switch tubes T7 - T12.

[0023] According to the above embodiments, preferably, a 13th power switch tube T13 is connected between the auxiliary excitation winding F1 and the auxiliary excitation winding F3, a 14th power switch tube T14 and a 15th power switch tube T15 are connected between the auxiliary excitation winding F1 and the auxiliary excitation winding F2, the collector of the 14th power switch tube T14 is connected to the emitter of the 15th power switch tube T15, the emitter of the 14th power switch tube T14 is connected to the collector of the 15th power switch tube T15, and the diodes D1 - D13 are respectively connected to the power switch tubes T1 - T13.

[0024] According to the above embodiments, preferably, one end of the auxiliary excitation winding F1 is connected to the emitter of the 4th power switch tube T4 and the collector of the 10th power switch tube T10 at the same time, and the other end of the auxiliary excitation winding F1 is connected to the collector of the 13th power switch tube T13, the collector of the 14th power switch tube T14 and the emitter of the 15th power switch tube T15 at the same time; one end of the auxiliary excitation winding F2 is connected to the emitters of the 5th power switch tube T5 and the 14th power switch tube T14, the collector of the 11th power switch tube T11 and the collector of the 15th power switch tube T15 at the same time, and the other end of the auxiliary excitation winding F2 is connected to the emitter of the 13th power switch tube T13 and one end of the auxiliary excitation winding F3 at the same time; the other end of the auxiliary excitation winding F3 is connected to the emitter of the 6th power switch tube T6 and the collector of the 12th power switch tube T12 at the same time.

[0025] The specific working process of the present invention is as follows: As Figure 2 shown, when the three-phase windings of the mutual inductance type switched reluctance motor are working normally, the power switch tubes T4, T14, and T12 are in the conducting state, and the three auxiliary excitation windings are connected in series and in the auxiliary excitation state, which can increase the output torque of the motor; as Figure 3 shown, when a fault occurs in the three-phase windings of the mutual inductance type switched reluctance motor, the three-phase windings of the mutual inductance type switched reluctance motor stop the armature operation state, the power switch tubes T4, T5, T6, and T13 are in the conducting state, the phases of the auxiliary excitation windings F3 are opposite, and one end of the three auxiliary excitation windings is connected to the same point and in the armature operation state, replacing the armature structure of the mutual inductance type switched reluctance motor to make the motor still in the normal operation state, thereby improving the operation reliability of the motor.

[0026] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A mutual inductance type switched reluctance motor power topology with an auxiliary excitation winding, characterized in that, Comprising: A DC power supply V, a power supply filter capacitor C connected in parallel with the DC power supply V, a plurality of power switching transistors connected to the DC power supply V, a plurality of diodes connected to each power switching transistor, a plurality of auxiliary excitation windings connected between the power switching transistors, and a three-phase mutual inductance type switched reluctance motor connected between the power switching transistors; Comprising: 15 power switching transistors T1 - T15, 13 diodes D1 - D13, and 3 auxiliary excitation windings F1 - F3. The auxiliary excitation windings F1 - F3 are connected in series. The three-phase mutual inductance type switched reluctance motor includes a phase A winding, a phase B winding, and a phase C winding; The positive pole of the DC power supply V is connected to the collectors of the power switching transistors T1 - T6, and the negative pole of the DC power supply V is connected to the emitters of the power switching transistors T7 - T12. The emitter of the power switching transistor T1 is connected to the collector of the power switching transistor T7, the emitter of the power switching transistor T2 is connected to the collector of the power switching transistor T8, the emitter of the power switching transistor T3 is connected to the collector of the power switching transistor T9, the emitter of the power switching transistor T4 is connected to the collector of the power switching transistor T10, the emitter of the power switching transistor T5 is connected to the collector of the power switching transistor T11, and the emitter of the power switching transistor T6 is connected to the collector of the power switching transistor T12. A power switching transistor T13 is connected between the auxiliary excitation winding F1 and the auxiliary excitation winding F3. A power switching transistor T14 and a power switching transistor T15 are connected between the auxiliary excitation winding F1 and the auxiliary excitation winding F2. The collector of the power switching transistor T14 is connected to the emitter of the power switching transistor T15, and the emitter of the power switching transistor T14 is connected to the collector of the power switching transistor T15. The diodes D1 - D13 are respectively connected to the power switching transistors T1 - T13. One end of the phase A winding is simultaneously connected to the emitter of the power switching transistor T1 and the collector of the power switching transistor T7. One end of the phase B winding is simultaneously connected to the emitter of the power switching transistor T2 and the collector of the power switching transistor T8. One end of the phase C winding is simultaneously connected to the emitter of the power switching transistor T3 and the collector of the power switching transistor T9. The other ends of the phase A winding, the phase B winding, and the phase C winding are connected to one point. One end of the auxiliary excitation winding F1 is simultaneously connected to the emitter of the power switching transistor T4 and the collector of the power switching transistor T10. The other end of the auxiliary excitation winding F1 is simultaneously connected to the collector of the power switching transistor T13, the collector of the power switching transistor T14, and the emitter of the power switching transistor T15. One end of the auxiliary excitation winding F2 is simultaneously connected to the emitters of the power switching transistors T5 and T14, the collector of the power switching transistor T11, and the collector of the power switching transistor T15. The other end of the auxiliary excitation winding F2 is simultaneously connected to the emitter of the power switching transistor T13 and one end of the auxiliary excitation winding F3. The other end of the auxiliary excitation winding F3 is simultaneously connected to the emitter of the power switching transistor T6 and the collector of the power switching transistor T12. When the three-phase windings of the mutual inductance type switched reluctance motor are operating normally, the power switch tubes T4, T14, and T12 are in the conducting state, and the three auxiliary excitation windings are connected in series and in the auxiliary excitation state. When a fault occurs in the three-phase windings of the mutual inductance type switched reluctance motor, the three-phase windings of the mutual inductance type switched reluctance motor stop the armature operating state, the power switch tubes T4, T5, T6, and T13 are in the conducting state, the phase of the auxiliary excitation winding F3 is opposite, and one end of the three auxiliary excitation windings is connected to the same point and is in the armature operating state.

Images