阅读说明：本技术 一种新型双定子开关磁阻电机集成充电功能驱动变换器 (Novel double-stator switched reluctance motor integrated charging function driving converter ) 是由 程鹤 廖朔 张动宾 闫文举 于东升 于 2021-09-15 设计创作，主要内容包括：本发明公开了一种新型双定子开关磁阻电机集成充电功能驱动变换器,包括新型模块化U型双定子开关磁阻电机内外定子绕组、整流器直流母线电容2个、电动汽车蓄电池、第一继电器、第二继电器、分别用于内外定子绕组的6个开关管、6个二极管两套。每套开关管和二极管与母线电容构成驱动双定子开关磁阻电机内外定子绕组的功率变换器。母线电流由连接交流电网的整流器提供,通过第一继电器的开合来控制内外定子功率变换器的开合。断开时,通过驱动外定子,使内定子工作在发电状态实现隔离充电,通过控制第二继电器的开合来改变电动汽车工作模式,实现非隔离充电。本发明利用新型分段式双定子开关磁阻电机的内外定子结构及其电气隔离特性,利用电机绕组和已有功率开关器件构成具有隔离与非隔离充电功能的集成驱动变换器,减少功率开关管的使用,降低电动汽车成本,融合驱动与充电功能,同时增强安全性。(The invention discloses a novel double-stator switched reluctance motor integrated charging function driving converter which comprises two sets of 6 switching tubes and 6 diodes, wherein the two sets of 6 switching tubes and the two sets of 6 diodes are respectively used for an inner stator winding and an outer stator winding of a novel modularized U-shaped double-stator switched reluctance motor, 2 rectifier direct-current bus capacitors, an electric vehicle storage battery, a first relay and a second relay. Each set of switch tube, diode and bus capacitor form a power converter for driving the inner and outer stator windings of the double-stator switch reluctance motor. The bus current is provided by a rectifier connected with an alternating current power grid, and the opening and closing of the inner stator power converter and the outer stator power converter are controlled through the opening and closing of the first relay. When the electric vehicle is disconnected, the outer stator is driven, the inner stator works in a power generation state to realize isolated charging, and the working mode of the electric vehicle is changed by controlling the opening and closing of the second relay, so that non-isolated charging is realized. The invention utilizes the inner and outer stator structures of the novel sectional double-stator switched reluctance motor and the electrical isolation characteristic thereof, and utilizes the motor winding and the existing power switch device to form the integrated driving converter with the functions of isolation and non-isolation charging, thereby reducing the use of power switch tubes, reducing the cost of the electric automobile, combining the driving and charging functions and simultaneously enhancing the safety.)

1. The utility model provides a novel integrated function drive converter that charges of two stator switched reluctance motor which characterized in that:

the novel double-stator switched reluctance motor consists of 8U-shaped stator blocks, the number of teeth inside and outside a rotor is 18, the polarity distribution of outer stator teeth is N-S-S-N-N-S-S-N-N-S-S-N-N-S-S-N, and the polarity distribution of inner stator teeth is S-N-N-S-S-N-N-S-S-N-S; the novel double-stator switched reluctance motor comprises an inner stator winding and an outer stator winding, an included angle between two shafts of inner teeth and outer teeth of a rotor is 7.5 degrees, and the number of motor phases is four; defining the inner stator winding of the novel double-stator switched reluctance motor as A, B, C and D phases respectively, and the outer stator winding as E, F, G and H phase respectively; the integrated drive converter comprises a rectifier, two DC bus capacitors C_oAnd C_i12 power switch tubes, 12 diodes, an electric vehicle storage battery and 2 relays; the rectifier converts the AC into DC, and the external stator bus capacitor C_oThe positive electrode is connected with the positive output end of the rectifier, and the external stator bus capacitor C_oThe negative electrode is connected with the negative output end of the rectifier; external stator bus capacitor C_oPositive electrode and switch tube S_o1、S_o2Collector electrode of (2) and diode D_o3、D_o4、D_o5、D_o6The negative electrodes are connected; external stator bus capacitor C_oNegative electrode and switching tube S_o3、S_o4、S_o5、S_o6Emitter and diode D_o1、D_o2The positive electrodes of the two electrodes are connected; parallel common terminal of outer stator winding E, G and switching tube S_o1Emitter, diode D_o1Is connected with the cathode of the winding E, and the other end of the winding E is connected with a diode D_o3Anode and switch tube S_o3The other end of the winding G is connected with a diode D_o4Anode and switch tube S_o4A collector electrode of (a); an outer stator winding F,H parallel connection common terminal and switch tube S_o2Emitter, diode D_o2Is connected with the cathode of the winding F, and the other end of the winding F is connected with a diode D_o5Anode and switch tube S_o5The other end of the winding H is connected with a diode D_o6Anode and switch tube S_o6A collector electrode of (a); external stator bus capacitor C_oThe two ends of the anode and the cathode respectively pass through a relay J₁Two ports of the capacitor are respectively connected with a bus capacitor C of the internal stator_iThe positive electrode is connected with the two ends of the negative electrode; internal stator bus capacitor C_iPositive electrode and switch tube S_i1、S_i2Is connected to the collector of diode D_i3、D_i4、D_i5、D_i6The negative electrode of the battery is connected with the positive electrode of the storage battery of the electric automobile; bus capacitor C_iPositive electrode and switch tube S_i1、S_i2The connected common terminal of the collector electrode of the relay is connected with the relay through a relay J₂And diode D_i3、D_i4、D_i5、D_i6The negative pole of the capacitor is connected with the public end connected with the positive pole of the storage battery of the electric automobile, and the bus capacitor C of the internal stator_iNegative electrode and switching tube S_i3、S_i4、S_i5、S_i6Emitter and diode D_i1、D_i2The anode of the battery is connected with the cathode of the storage battery of the automobile; common end of the inner stator winding A, C in parallel connection with the switch tube S_i1Emitter, diode D_i1Is connected with the cathode of the winding A, and the other end of the winding A is connected with a diode D_i3Anode and switch tube S_i3The other end of the winding C is connected with a diode D_i4Anode and switch tube S_i4A collector electrode of (a); parallel common terminal of inner stator winding B, D and switching tube S_i2Emitter, diode D_i2Is connected with the cathode of the winding B, and the other end of the winding B is connected with a diode D_i5Anode and switch tube S_i5The other end of the winding D is connected with a diode D_i6Anode and switch tube S_i6By controlling the relay J₁、J₂The switching of the driving, the isolated charging and the non-isolated charging functional modes of the integrated driving converter of the electric automobile is realized.

2. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 1, wherein: when the electric automobile works in the driving mode, the relay J₁、J₂And closing, and realizing three working modes of inner stator driving, outer stator driving and double stator driving by controlling the switches of all the switch tubes.

3. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 2, wherein: when the electric automobile works in an outer stator driving mode, the power switch device used is S_o1、S_o2、S_o3、S_o4、S_o5And S_o6The diode used is D_o1、D_o2、D_o3、D_o4、D_o5、D_o6。

4. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 2, wherein: when the electric automobile works in an inner stator driving mode, the power switch device is S_i1、S_i2、S_i3、S_i4、S_i5And S_i6The diode used is D_i1、D_i2、D_i3、D_i4、D_i5And D_i6。

5. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 2, wherein: when the electric automobile works in a double-stator driving mode, the power switch device used is S_i1、S_i2、S_i3、S_i4、S_i5、S_i6，S_o1、S_o2、S_o3、S_o4、S_o5And S_o6The diode used is D_i1、D_i2、D_i3、D_i4、D_i5、D_i6、D_o1、D_o2、D_o3、D_o4、D_o5And D_o6。

6. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 1, wherein: when the electric automobile stops running and enters a charging mode, the relay J is controlled₁、J₂Switching, sharing two modes of isolated charging and non-isolated charging.

7. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 6, wherein: when the electric automobile works in the isolation charging mode, the relay J₁Break, J₂And when the motor is closed, the rectifier is connected with an alternating current power grid, the outer stator works in an electric mode, and the inner stator works in a power generation mode to form an electric-charging mode so as to charge the storage battery of the electric automobile, so that the electric isolation charging is completed.

8. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 6, wherein: when the electric automobile works in a non-isolated charging mode, the relay J₁Closure, J₂And when the rectifier is disconnected, the rectifier is connected with an alternating current power grid, and a phase-interleaved BUCK converter is formed by utilizing the winding of the existing inner stator and the power converter to charge the storage battery of the electric automobile.

9. The novel double-stator switched reluctance motor integrated charging function driving converter according to claim 1, wherein:

all the switch tubes are IGBT, and can also be power MOSFET; the diode is a fast recovery diode.

Technical Field

The invention relates to the field of novel motors and control thereof and the field of electric vehicle storage battery charging, in particular to an integrated drive converter with an isolation and non-isolation charging function.

Background

Compared with the traditional automobile, the electric automobile has more advantages, and the advantages of zero emission, low noise, high efficiency and energy conservation make the electric automobile get more and more attention. The electric vehicle driving system plays a very important role as a core system of the electric vehicle. The switched reluctance motor is one member of an electric drive queue, and the popularization and the application of the switched reluctance motor are limited due to the main defects of low torque density, high torque pulsation, high noise and the like. In order to solve the above disadvantages, patent No. 2019108191531 discloses a novel double-stator switched reluctance motor which adopts a sectional U-shaped stator structure and has a rotor tooth axis staggered by a certain mechanical angle, wherein the novel switched reluctance motor can effectively reduce torque pulsation due to the staggered certain mechanical angle of the inner and outer rotor tooth axes, and can be divided into an inner stator excitation mode, an outer stator excitation mode and a double-stator excitation mode when the novel switched reluctance motor works because of the decoupling of an inner magnetic field and an outer magnetic field. The three modes also provide the possibility of realizing two electrically isolated charging technologies of outer stator electric-inner stator power generation or inner stator electric-outer stator power generation. The application of the conventional asymmetric half-bridge power converter to the novel double-stator switched reluctance motor requires more power switch tube devices, which not only increases the cost of the power converter, but also increases the loss of the power converter, so that the topology structure of the power converter needs to be further improved.

As a core technology of an electric vehicle, a charging system is important as a drive system of the electric vehicle. The traditional electric automobile has the advantages that the driving system, the traction battery charging system and the auxiliary battery charging system are independent, the size, the weight and the cost of the electric automobile are increased, and the further development of the electric automobile is limited. The vehicle-mounted charger is an indispensable device of the current electric automobile and mainly comprises circuit elements such as a capacitor, a transformer, an inductor, a power converter, a power switch and the like. The driving topologies of the elements are also provided, so that if the elements can be time-division multiplexed to integrate an electric driving system and a charging system, the cost and the volume of the electric automobile can be greatly reduced, and the driving topologies are considered solutions.

Disclosure of Invention

In order to achieve the technical purpose, the invention is realized by adopting the following technical scheme.

A novel double-stator switched reluctance motor integrated charging function driving converter is characterized in that.

The novel double-stator switched reluctance motor consists of 8U-shaped stator blocks, the number of teeth inside and outside a rotor is 18, the polarity distribution of outer stator teeth is N-S-S-N-N-S-S-N-N-S-S-N-N-S-S-N, and the polarity distribution of inner stator teeth is S-N-N-S-S-N-N-S-S-N-S; the novel double-stator switched reluctance motor comprises an inner stator winding and an outer stator winding, wherein an included angle between two axes of inner teeth and outer teeth of a rotor is 7.5 degrees, and the number of motor phases is four;

further, the inner stator windings of the novel double-stator switched reluctance motor are defined as A, B, C and D phases respectively, and the outer stator windings are defined as E, F, G and H phases respectively. The integrated drive converter comprises a rectifier, two DC bus capacitors C_oAnd C_i12 power switch tubes, 12 diodes, an electric vehicle storage battery and 2 relays. The rectifier converts the AC into DC, and the external stator bus capacitor C_oThe positive electrode is connected with the positive output end of the rectifier, and the external stator bus capacitor C_oThe negative electrode is connected with the negative output end of the rectifier. External stator bus capacitor C_oPositive electrode and switch tube S_o1、S_o2Collector electrode of (2) and diode D_o3、 D_o4、D_o5、D_o6Are connected with each other. External stator bus capacitor C_oNegative electrode and switching tube S_o3、S_o4、S_o5、S_o6Emitter and diode D_o1、D_o2The positive electrodes of (a) and (b) are connected. Parallel common terminal of outer stator winding E, G and switching tube S_o1Emitter, diode D_o1Is connected with the cathode of the winding E, and the other end of the winding E is connected with a diode D_o3Anode and switch tube S_o3The other end of the winding G is connected withDiode D_o4Anode and switch tube S_o4A collector electrode of (a); common end of outer stator winding F, H in parallel connection with switch tube S_o2Emitter, diode D_o2Is connected with the cathode of the winding F, and the other end of the winding F is connected with a diode D_o5Anode and switch tube S_o5The other end of the winding H is connected with a diode D_o6Anode and switch tube S_o6The collector electrode of (1). External stator bus capacitor C_oThe two ends of the anode and the cathode respectively pass through a relay J₁Two ports of the capacitor are respectively connected with a bus capacitor C of the internal stator_iThe positive electrode is connected with the two ends of the negative electrode. Internal stator bus capacitor C_iPositive electrode and switch tube S_i1、S_i2Is connected to the collector of diode D_i3、D_i4、D_i5、D_i6The negative electrode of the battery is connected with the positive electrode of the storage battery of the electric automobile; bus capacitor C_iPositive electrode and switch tube S_i1、S_i2The common terminal connected with the collector passes through a relay J₂And diode D_i3、D_i4、D_i5、D_i6The negative pole of the capacitor is connected with the public end connected with the positive pole of the storage battery of the electric automobile, and the bus capacitor C of the internal stator_iNegative electrode and switching tube S_i3、S_i4、S_i5、S_i6Emitter and diode D_i1、D_i2The anode of the battery is connected with the cathode of the storage battery of the automobile. Common end of the inner stator winding A, C in parallel connection with the switch tube S_i1Emitter, diode D_i1Is connected with the cathode of the winding A, and the other end of the winding A is connected with a diode D_i3Anode and switch tube S_i3The other end of the winding C is connected with a diode D_i4Anode and switch tube S_i4A collector electrode of (a); parallel common terminal of inner stator winding B, D and switching tube S_i2Emitter, diode D_i2Is connected with the cathode of the winding B, and the other end of the winding B is connected with a diode D_i5Anode and switch tube S_i5The other end of the winding D is connected with a diode D_i6Anode and switch tube S_i6By controlling the relay J₁、J₂The drive of the integrated drive converter of the electric automobile is realizedAnd switching between the isolation charging function mode and the non-isolation charging function mode.

Further, when the electric vehicle is operated in the driving mode, the relay J₁、J₂And closing, and realizing three working modes of inner stator driving, outer stator driving and double stator driving by controlling the switches of all the switch tubes.

Further, when the electric automobile works in an outer stator driving mode, the power switch device used is S_o1、S_o2、 S_o3、S_o4、S_o5And S_o6The diode used is D_o1、D_o2、D_o3、D_o4、D_o5、D_o6。

Further, when the electric automobile works in the inner stator driving mode, the power switch device used is S_i1、S_i2、 S_i3、S_i4、S_i5And S_i6The diode used is D_i1、D_i2、D_i3、D_i4、D_i5And D_i6。

Further, when the electric automobile works in a double-stator driving mode, the power switch device is S_i1、S_i2、 S_i3、S_i4、S_i5、S_i6，S_o1、S_o2、S_o3、S_o4、S_o5And S_o6The diode used is D_i1、D_i2、D_i3、D_i4、 D_i5、D_i6、D_o1、D_o2、D_o3、D_o4、D_o5And D_o6。

Further, when the electric automobile stops running and enters a charging mode, the relay J is controlled₁、J₂Switching, sharing two modes of isolated charging and non-isolated charging.

Further, when the electric vehicle is operated in the isolated charging mode, the relay J₁Break, J₂Closed, rectifier connected to AC network, outer stator operating in motor mode, inner stator operating in generator mode to formAnd in the electric-charging mode, the storage battery of the electric automobile is charged, and the electric isolation charging is completed.

Further, when the electric automobile works in the non-isolated charging mode, the relay J₁Closure, J₂And when the rectifier is disconnected, the rectifier is connected with an alternating current power grid, and a phase-interleaved BUCK converter is formed by utilizing the winding of the existing inner stator and the power converter to charge the storage battery of the electric automobile.

Furthermore, all the switch tubes are IGBTs and can also be power MOSFETs; the diode is a fast recovery diode.

Compared with the prior art, the invention adopting the technical scheme has the following technical effects:

compared with the traditional power converter, the power converter reduces the use of power switching tubes, reduces the cost, and can normally realize three driving modes of an inner stator, an outer stator and a double stator; the traction motor winding and the power electronic device are repeatedly used, the double-stator structure and the electrical isolation characteristic of the novel double-stator switched reluctance motor are utilized, the electric power transmission system and the battery charging function are integrated, and three functions of traction battery driving motor, isolation charging and non-isolation charging are realized; the integration degree of the whole system is improved, the cost of the electric automobile is reduced, and the charging flexibility of the electric automobile is improved.

Drawings

Fig. 1 is a diagram of an integrated converter topology of the present invention.

Fig. 2 shows three states of the driving mode of the present invention, (a) shows an excited state, (b) shows a free-wheeling state, and (c) shows a demagnetized state.

Fig. 3 is a topology diagram of an electrically isolated charging mode of the present invention.

Fig. 4 is a diagram of a non-isolated charging mode of the present invention.

Fig. 5 is a state diagram of a non-isolated charging mode 1 of the present invention.

Fig. 6 is a state 2 diagram of a non-isolated charging mode of the present invention.

Fig. 7 is a flow chart of the non-isolated charging mode control of the present invention.

Fig. 8 is a schematic diagram of an electrically isolated charging mode of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

An embodiment of the invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, the ac grid charging interface is electrically connected to the rectifier diode to convert the grid ac power into dc power for the integrated converter bus. The inner stator winding of the novel double-stator switched reluctance motor is defined to be A, B, C and D phases respectively, and the outer stator winding of the novel double-stator switched reluctance motor is defined to be E, F, G and H phases respectively. The integrated drive converter comprises a rectifier, two DC bus capacitors C_oAnd C_i12 power switch tubes, 12 diodes, an electric vehicle storage battery and 2 relays. The rectifier converts the AC into DC, and the external stator bus capacitor C_oThe positive electrode is connected with the positive output end of the rectifier, and the external stator bus capacitor C_oThe negative electrode is connected with the negative output end of the rectifier. External stator bus capacitor C_oPositive electrode and switch tube S_o1、S_o2Collector electrode of (2) and diode D_o3、D_o4、D_o5、D_o6Are connected with each other. External stator bus capacitor C_oNegative electrode and switching tube S_o3、S_o4、S_o5、 S_o6Emitter and diode D_o1、D_o2The positive electrodes of (a) and (b) are connected. Parallel common terminal of outer stator winding E, G and switching tube S_o1Emitter, diode D_o1Is connected with the cathode of the winding E, and the other end of the winding E is connected with a diode D_o3Anode and switch tube S_o3The other end of the winding G is connected with a diode D_o4Anode and switch tube S_o4A collector electrode of (a); common end of outer stator winding F, H in parallel connection with switch tube S_o2Emitter, diode D_o2Is connected with the cathode of the winding F, and the other end of the winding F is connected with a diode D_o5Anode and switch tube S_o5The other end of the winding H is connected with a diode D_o6Anode and switch tube S_o6The collector electrode of (1). External stator bus capacitor C_oThe two ends of the anode and the cathode respectively pass through a relay J₁Two ports of the capacitor are respectively connected with a bus capacitor C of the internal stator_iThe positive electrode is connected with the two ends of the negative electrode. Internal stator bus capacitor C_iPositive electrode and switch tube S_i1、S_i2Is connected to the collector of diode D_i3、D_i4、D_i5、D_i6The negative electrode of the battery is connected with the positive electrode of the storage battery of the electric automobile; bus capacitor C_iPositive electrode and switch tube S_i1、S_i2The common terminal connected with the collector passes through a relay J₂And diode D_i3、D_i4、D_i5、D_i6The negative pole of the capacitor is connected with the public end connected with the positive pole of the storage battery of the electric automobile, and the bus capacitor C of the internal stator_iNegative electrode and switching tube S_i3、S_i4、S_i5、S_i6Emitter and diode D_i1、D_i2The anode of the battery is connected with the cathode of the storage battery of the automobile. Common end of the inner stator winding A, C in parallel connection with the switch tube S_i1Emitter, diode D_i1Is connected with the cathode of the winding A, and the other end of the winding A is connected with a diode D_i3Anode and switch tube S_i3The other end of the winding C is connected with a diode D_i4Anode and switch tube S_i4A collector electrode of (a); parallel common terminal of inner stator winding B, D and switching tube S_i2Emitter, diode D_i2Is connected to the cathode of the winding BOne end is connected with a diode D_i5Anode and switch tube S_i5The other end of the winding D is connected with a diode D_i6Anode and switch tube S_i6By controlling the relay J₁、J₂The switching of the driving, the isolated charging and the non-isolated charging functional modes of the integrated driving converter of the electric automobile is realized. The integrated drive converter system is realized by controlling the relay J₁、J₂The switching of the driving circuit realizes the functions of driving, isolated charging and non-isolated charging of the integrated driving converter of the electric automobile, and can work in three states of a driving mode, an isolated charging mode and a non-isolated charging mode.

The inner stator and the outer stator have similar structures, and the inner stator and the outer stator can adopt the same topological structure for the same power converter. The conductive phase sequence inner and outer stators are A-B-C-D and E-F-G-H respectively. As shown in FIG. 1, non-adjacent phases, such as A and C, or B and D, cannot be conducted simultaneously, so that the A and C phases can drive the same upper switch tube S by position control signals_i1Lower switch S driven by current chopping signal_i3And S_i4The same topology is used for controlling A, C-phase, B-phase and D-phase, E-phase and G-phase, F-phase and H-phase windings. The diode rectifier is used for converting an alternating current power supply of a power grid into a power supply of a direct current power supply charging mode and is connected to a direct current bus of the inner stator converter and the outer stator converter. Relay J₁Is a power converter, relay J for connecting or disconnecting the inner and outer stators₂For changing the mode of operation.

(1) Drive mode

As shown in fig. 1, when the electric vehicle is operated in the driving mode, the relay J₁、J₂The double-stator switched reluctance motor supplies power to the inner stator and the outer stator driving topology by the battery at the same time, and the double-stator switched reluctance motor works in an electric state. Taking the driving inner stator A, C phase winding as an example, in the driving mode, the relay J₁And J₂Is closed, the inner and outer stators are powered by the same battery. Two non-adjacent phases can be considered as one module. As shown in FIG. 2, there are three operating states in FIG. 2, namely (a) being the energized state and (b) being the energized stateThe free-wheeling state and (c) the demagnetizing state, similar to a conventional switched reluctance motor. Taking the inner stator A phase as an example, the upper switch tube S_i1Driven by position signal, kept open in conduction angle, and lower switch tube S_i3Driven by a current chopping signal. The actual phase current is made to follow a given value, thereby realizing the CCC (current chopping control) control mode of the switched reluctance motor. Or an upper switch tube S_i1Driven by position signal, kept open in conduction angle, and lower switch tube S_i3Driven by a voltage PWM chopping signal. And tracking the actual phase current with a given value, thereby realizing a voltage PWM control mode of the switched reluctance motor. The workflow of the three states of fig. 2 is explained in detail below.

1. In the excited state, S, as shown in FIG. 2(a)_i1And S_i3On, phase a is excited by the battery and the phase current rises rapidly.

2. In the freewheeling state, S, as shown in FIG. 2(b)_i1Is conductive, S_i3Is off and phase current flows through the phase a winding via diode D_i3Then flows into the switch tube S_i1The phase current in this state is slowly decreased.

3. In the demagnetized state, S as shown in FIG. 2(c)_i1And S_i3Are all closed. The phase current now passes through diode D_i1Phase A, diode D_i3And then to the battery. The negative bus voltage will quickly drop to zero with the phase current applied to the phase winding.

The working states of the other phases are the same as A and are not described here. Then according to the control mode of the traditional switched reluctance motor, the drive topology is applied to control the inner stator and the outer stator, the novel sectional type double-electronic switched reluctance motor works in an inner stator excitation mode, an outer stator excitation mode and a double-stator excitation mode, and the double-stator switched reluctance motor works in an electric or power generation state by adjusting the turn-on angle and the turn-off angle.

(2) Non-isolated charging mode

The invention can also be used to charge batteries using motor windings and coils and existing electrical components. Two charging modes which can be realized by the integrated power converter comprise non-isolated charging and isolated chargingElectrical mode. In the charging mode, the clutch should be disconnected between the drive motor and the mechanical transmission. As shown in fig. 1, during non-isolated charging, J₁Closing of the relay J₂The relay is opened. The diode rectifier converts the AC of the power grid into a DC power supply, and the winding and the power converter of the inner stator form a phase-interleaved BUCK BUCK converter to charge the battery. Fig. 4 is a non-isolated charging topology implemented with an integrated diode rectifier, internal stator winding and its power converter. As shown in fig. 1, the battery charging current is the sum of the A, B, C, D phase winding currents. Windings A and C are connected in parallel, and windings B and D are also connected in parallel, and the power switch tube S_i1And S_i2Respectively controlling; lower switch tube S_i3、S_i4、S_i5、S_i6Always remains in the off state. The operating states of the two sets of windings are similar. On the basis of fig. 4, the operation states are shown in fig. 5 and 6, taking the phase windings a and C as examples. The specific operation is described in detail below.

1. As shown in fig. 5, capacitor C_iIn parallel with the rectifier, when S_i1When closed, current flows from capacitor C_iPositive electrode, switch tube S_i1Windings A and C, diode D_i3And D_i4Flows into the battery, and the current in windings a and C increases at this time because the positive voltage of the battery is applied to windings a and C.

2. As shown in fig. 6, when the switch tube S is turned on or off_i1When the switch is switched off, the direction of the current on the windings A and C is not changed, and the current flows through the diode D_i3And D_i4Flows into the battery and then flows through the backward diode D_i1Returning to the winding, this phase is the winding freewheel phase, the current decreases because the negative voltage of the battery is applied across windings a and C.

The above is the working process after the switch tube is switched off, and then the non-isolated charging is carried out by the traditional BUCK converter control method, wherein the staggering means that the chopping phase of the switch tube is controlled to be staggered by 180 degrees, so that the phase of A, C phase current is staggered by 180 degrees with the phase of B, D phase current. Fig. 7 is a control flow chart of the non-isolated charging mode according to the present invention, wherein the control flow chart adopts a voltage-current double closed-loop control mode.Given voltage U_BAnd actual battery voltage U_BVoltage error betweenThe input is a voltage PI controller with amplitude limiting, and the inner loop refers to a given current value i output by the outer loop controller_chAnd with the charging current i of the battery_chAnd comparing to obtain a current error, and inputting the current error to the current PI controller. By adding U to the output of the inner loop controller_BAnd then with the input voltage U of the rectifier_CDividing to obtain duty ratio of PWM generating module to control power switch tube S respectively_i1And S_i2. When in useWhen the amplitude is larger, the outer ring PI controller reaches the amplitude limiting value i_chmAt this point the charge current reference is constant to the inner loop. This mode may be referred to as a constant current charging mode. When in useWhen the charging voltage reference is constant, the charging current decreases as the battery voltage increases, which may be referred to as a constant voltage charging mode.

(3) Isolated charging mode

During isolated charging, as shown in FIG. 1, relay J₁Closure, J₂And (5) disconnecting. Since the proposed segmented double-stator switched reluctance motor has almost no magnetic field coupling between the inner and outer stators in its mechanical structure, it becomes possible to realize electrically isolated charging using the double-stator structure. The rectifier rectifies alternating current in a power grid into direct current serving as a power supply to provide power for the inner stator, the on-off angle of the inner stator is adjusted, and the inner stator is controlled to work in a motor state through the inner stator power converter; meanwhile, the opening angle and the closing angle of the outer stator are adjusted to enable the outer stator to work in a power generation state, the outer stator serves as a generator, and a battery is charged under the control of an outer stator power converter, and a specific topological diagram is shown in fig. 3. Schematic diagram and energy flow of this mode is shown in fig. 8, the inner stator motor converts the electric energy into electric energyThe mechanical energy is converted into mechanical energy, and then the outer stator is used as a generator to convert the mechanical energy of the rotor into electric energy. The double-stator switched reluctance motor can be used as a rotating-isolating transformer with an electrical isolation function to provide a charging power supply for a battery.