CN110061678B - Electro-magnetic doubly salient motor driving and charging integrated system - Google Patents
Electro-magnetic doubly salient motor driving and charging integrated system Download PDFInfo
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- CN110061678B CN110061678B CN201910289038.8A CN201910289038A CN110061678B CN 110061678 B CN110061678 B CN 110061678B CN 201910289038 A CN201910289038 A CN 201910289038A CN 110061678 B CN110061678 B CN 110061678B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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Abstract
The invention discloses an electro-magnetic doubly salient motor driving and charging integrated system and a method thereof. The invention integrates the split excitation winding of the doubly salient motor with the inductance of the DC/DC converter, combines the excitation control circuit and the system booster circuit of the electrically excited doubly salient motor together, reduces the volume and the weight of the system, makes the structure more compact, reduces the loss, combines the driving and charging control methods, makes the system have the characteristics of high power factor at the network side in the charging mode and small output torque pulsation of the motor in the driving mode, and fully exerts the advantages of high reliability, wide rotating speed range, high efficiency and high fault tolerance of the electrically excited doubly salient motor system.
Description
Technical Field
The invention relates to the field of motor systems and control, in particular to an electro-magnetic doubly salient motor driving and charging integrated system.
Background
With the increasing severity of the problems of environmental pollution, energy exhaustion and the like, the search for new energy to replace fossil fuel becomes a hot topic of research in all countries in the world. Due to the characteristics of energy conservation and environmental protection, the related technologies and industries of new energy automobiles are rapidly developing. Compared with a hybrid electric vehicle, the pure electric vehicle uses a single electric energy source, the internal structure is greatly simplified because no mechanical transmission system is arranged, and meanwhile, the mechanical loss and noise of the vehicle are reduced, so that the pure electric vehicle is the main development direction of the current new energy vehicle.
At present, the motors adopted by the electric automobile comprise an induction motor, a permanent magnet synchronous motor and a switched reluctance motor, which have respective characteristics during operation and are suitable for occasions. The induction motor has compact structure, small volume, light weight, low torque pulsation, low price and easy maintenance, even if the inverter is damaged and generates short circuit, the inverter does not have back electromotive force, so the possibility of sudden braking can not occur, but the defects of lower power factor, poor speed regulation performance and the like are main factors limiting the development of the inverter, and the inverter is mainly suitable for occasions with high speed and high power at present, wherein some companies represented by American Tesla electric automobiles adopt novel high-efficiency alternating current asynchronous motors.
The permanent magnet synchronous motor is generally adopted as a main driving motor of an electric automobile in China, the power factor is large, the efficiency is high, the structure is greatly simplified due to the fact that elements such as an excitation winding are omitted, and the maintenance is convenient, but the magnetic conductivity of a permanent magnet material is reduced even demagnetized under the conditions of vibration, high temperature and the like, so that the control is complex, the price of a rare earth material is continuously increased along with the increasing demand, and the cost problem is more and more obvious.
The switched reluctance motor is a latest generation stepless speed regulating system following a variable frequency speed regulating system and a brushless direct current motor speed regulating system, has the simplest structure, wide rotating speed range and flexible control compared with the motor, can realize four-quadrant operation, and has the problems of large output torque fluctuation and noise.
The doubly salient motor is a motor with a novel structure provided by U.S. famous motor experts T.A.Lipo and the like in the last 90 years on the basis of a traditional reluctance motor, and can be widely applied to a driving and charging integrated system of an electric automobile. Because the motor adds a set of excitation device on the stator (or rotor) of the switch reluctance motor, the brushless DC motor has the characteristics of strong anti-interference capability, few electric elements and simple structure, and has low cost and high power factor, but the excitation current and the armature current are mutually related and the size of the excitation current cannot be directly controlled.
At present, two charging modes for the power battery are generally available on the market, one is an independent charging system, and the other is a vehicle-mounted charging system. The independent charging system charges the battery by using the ground direct current charging pile, but the independent charging system occupies large vehicle-mounted space and needs to be configured
The ground quick charging device has large investment. Although the vehicle-mounted charging is more convenient and faster, the flexibility is good, the charging speed is slow, the charging time is long, and the weight of the automobile can be increased. The electro-magnetic doubly salient motor driving and charging integrated system with the split type excitation winding can utilize a driving system of a motor to carry out vehicle-mounted charging, reduces loss of the system while reducing devices, and therefore, the high-power driving and charging integrated system has great value in research.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electric excitation doubly salient motor driving and charging integrated system aiming at the defects related in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
an electro-magnetic doubly salient motor driving and charging integrated system comprises a storage battery, first to sixth switching tubes, a first change-over switch, a doubly salient motor, a direct-current filter capacitor, a three-phase bridge converter, an EMI filter and a second change-over switch;
the excitation winding of the doubly salient motor is cut off and divided into two sections with equal length, namely a first excitation winding section and a second excitation winding section, and the three-phase armature winding of the doubly salient motor is of an open structure;
the second change-over switch is a three-phase single-pole double-throw switch, one side of the second change-over switch is connected with an external power grid through an EMI filter, and the other side of the second change-over switch is correspondingly connected with one end of a three-phase armature winding of the double-salient-pole motor; the other end of the three-phase armature winding of the doubly salient motor is correspondingly connected with the middle points of three bridge arms of the three-phase bridge type converter respectively;
the first to sixth switching tubes, the first change-over switch, the first excitation winding section and the second excitation winding section form a charging and discharging DC/DC converter, wherein the first to third switching tubes are sequentially connected in series to form an input bridge arm of the charging and discharging DC/DC converter, and the fourth to sixth switching tubes are sequentially connected in series to form an output bridge arm of the charging and discharging DC/DC converter; one end of the first excitation winding section is connected with the middle points of the first switching tube and the second switching tube, and the other end of the first excitation winding section is connected with the middle points of the fourth switching tube and the fifth switching tube; one end of the second excitation winding section is connected with the middle points of the second switching tube and the third switching tube, and the other end of the second excitation winding section is connected with the middle points of the fifth switching tube and the sixth switching tube; the emitter of the third switching tube is connected with the emitter of the sixth switching tube through a first change-over switch;
the first to sixth switching tubes are all anti-parallel diodes;
two ends of an input bridge arm of the charging and discharging DC/DC converter are connected with two ends of the storage battery, and two ends of an output bridge arm of the charging and discharging DC/DC converter are cascaded with the three-phase bridge converter through the direct current filter capacitor.
The invention also provides a control method for the double-salient electro-magnetic motor driving and charging integrated system in a driving mode, which comprises the following steps:
the second change-over switch is closed, the tail end of a three-phase armature winding of the electric excitation double-salient motor is short-circuited to form a star connection mode, the EMI filter does not work, and the connection with a power grid is disconnected;
the first change-over switch is closed, the charging and discharging DC/DC converter is switched to a Boost converter, the charging and discharging DC/DC converter works in a Boost mode, the first switch tube and the second switch tube are switched on, the third switch tube and the fourth switch tube are switched off, the fifth switch tube and the sixth switch tube work in a PWM chopping mode, the first excitation winding section and the second excitation winding section are connected in parallel in an equivalent mode, at the moment, the charging and discharging DC/DC converter promotes the voltage of a storage battery, and the motor is driven to run by the rear-stage three-phase bridge converter.
The invention also provides a control method for the double-salient electro-magnetic motor driving and charging integrated system in a charging mode, which comprises the following steps:
the second change-over switch is opened, and the tail end of a three-phase armature winding of the electric excitation doubly salient motor is connected with an EMI filter and is equivalent to a three-phase filter inductor;
when the system is in a charging mode, the first switch is turned on, the charging and discharging DC/DC converter is switched to a Buck converter, the fourth switch tube works in a PWM chopping mode, the sixth switch tube is turned on, the first, second, third and fifth switch tubes are turned off, the first excitation winding section and the second excitation winding section are equivalently and reversely connected in series, the demagnetization function of the electro-excitation double-salient motor is realized, the three-phase bridge converter works in the PWM rectifier mode, three-phase alternating current is converted into direct current, and the direct current is reduced by the Buck converter to charge the storage battery.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
according to the invention, the split excitation winding of the doubly salient motor is integrated with the DC/DC converter inductor, and the excitation control circuit and the system booster circuit of the electrically excited doubly salient motor are combined together, so that the structure of the vehicle-mounted equipment is simplified, the ground charging cost is reduced, and the vehicle-mounted equipment is lighter than the vehicle-mounted charging weight; the two modes of driving and charging are reliably and effectively switched through the charging and discharging switch K2, the networking of the electric automobile and the power grid is smoothly realized, and the bidirectional flow of the energy of the automobile and the power grid is realized through the power grid dispatching.
In the driving mode, the excitation control circuit of the electrically excited doubly salient motor and the system booster circuit are combined together, so that an additional excitation power supply for excitation of the traditional electrically excited doubly salient motor in the driving mode is omitted, the problem of excitation loss of the permanent magnet motor is solved, devices are reduced, the integral loss of the system is reduced, and the operation efficiency is improved.
In a charging mode, the switching tube arrangement mode of the DC/DC converter designed by the invention enables the two-section split excitation windings to be reversely connected in series without an additional change-over switch at the side of the DC/DC converter, and positive and negative torques generated by a double-salient-pole motor after an armature winding is electrified can be offset, so that the torque output of the motor is inhibited, and the additional loss is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a driving and charging integrated system for multiplexing excitation windings of an electro-magnetic doubly salient motor;
fig. 2 is a schematic diagram of a connection mode of excitation windings of an 12/10 pole electric excitation doubly salient motor;
FIG. 3 is a schematic diagram of an electrically excited doubly salient motor with two excitation windings formed by connecting 4 excitation windings in series;
FIG. 4 is a schematic diagram of an electrically excited doubly salient motor with two excitation windings connected in parallel by 4 excitation windings;
fig. 5 is a current simulation waveform of a split field winding F1 of the motor during starting of the motor in a drive mode;
FIG. 6 is a simulated waveform of the output side voltage of the DC/DC converter during the starting process of the motor in the driving mode;
FIG. 7 is a simulated waveform of the motor speed during the motor starting process in the driving mode;
FIG. 8 is a waveform of a simulation of the armature current of the motor in the charging mode;
fig. 9 is a simulation waveform of the battery charging current in the charging mode.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
In order to reduce the volume and weight of a driving and charging integrated system, make the structure more compact and reduce the loss, the system has a net-side high power factor in a charging mode, the output torque pulsation of a motor in a driving mode is small, and the advantages of high reliability, wide rotating speed range, high efficiency and high fault tolerance of an electro-magnetic doubly salient motor system are fully exerted.
An electric excitation doubly salient motor adopts an 12/10-pole structure, an armature winding and an excitation winding of the electric excitation doubly salient motor are arranged as shown in fig. 2, the excitation winding of the doubly salient motor can also be cut into a plurality of sections, when the number of the excitation winding sections formed by cutting the doubly salient motor is more than two sections, two sections of excitation windings can be formed in a serial or parallel mode, a schematic diagram that 4 sections of excitation windings are connected in series to form two sections is shown in fig. 3, and a schematic diagram that 4 sections of excitation windings are connected in parallel to form two sections is shown in fig. 4.
The storage battery is connected with the input end of the charging and discharging DC/DC converter, the split excitation winding of the doubly salient motor is reused for the charging and discharging DC/DC converter, the output of the DC/DC converter is cascaded with the three-phase bridge converter through a direct current side filter capacitor, and the armature winding of the electrically excited doubly salient motor is of an open structure and is connected to a three-phase single-pole double-throw charging and discharging change-over switch K2.
The system realizes the switching of driving and charging states through a charging and discharging switch K2. When the system is in a driving mode, the charge-discharge changeover switch K2 is in a closed state, the tail end of a three-phase armature winding of the electric excitation doubly salient motor is short-circuited to form a star connection mode, the EMI filter does not work, and the connection with a power grid is disconnected; when the system is in a charging mode, the charging and discharging change-over switch K2 is automatically opened by means of electric energy of a power grid, and the tail end of a three-phase armature winding of the electric excitation doubly salient motor is connected with an EMI filter and is equivalent to a three-phase filter inductor.
The charging and discharging DC/DC converter is composed of 6 switching tubes S1-S6, a change-over switch K1, split excitation windings F1 and F2 of an electro-magnetic doubly salient motor and a filter capacitor C1, three switching tubes S1, S2 and S3 are sequentially connected in series to form a bridge arm, the middle points of S1 and S2 and the middle points of S2 and S3 are respectively connected to one end of two sections of excitation windings of the electro-magnetic doubly salient motor, the switching tubes S4, S5 and S6 are sequentially connected in series to form another bridge arm, the middle points of S4 and S5 and the middle points of S5 and S6 are respectively connected to the other end of the two sections of the excitation windings of the electro-magnetic doubly salient motor, the switching tube K1 is located between the two bridge arms, and the filter capacitor C1 is located at the output end of the charging and.
The charging and discharging DC/DC converter adopts a voltage and current double closed-loop control mode to respectively collect the voltage of the storage battery and the voltage of the capacitor, performs closed-loop control on the voltage of the storage battery in the discharging process, switches the voltage closed-loop control module according to the working mode of the system, outputs the voltage closed-loop control module to a current loop as given current, compares the given current with the fed actual current, generates PWM control signals through a current regulator to selectively control S4, S5 and S6, and realizes the regulation of the exciting current and the output voltage of the charging and discharging DC/DC converter.
In the drive mode, the switch K is switched1And when the charging and discharging DC/DC converter is closed, the charging and discharging DC/DC converter is switched to a Boost converter, the charging and discharging DC/DC converter works in a Boost mode, the voltage of the storage battery is boosted, and the motor is driven to operate by the rear-stage three-phase bridge converter.
Switching tubes S1 and S2 are switched on to control the magnitude of output voltage, the switching tubes S3 and S4 are switched off, the switching tubes S5 and S6 work in a PWM chopping mode, split excitation windings F1 and F2 are connected in parallel equivalently, and under the condition that the duty ratios of S1 and S2 are determined, the control over the excitation current of the two sections of excitation windings can be achieved by adjusting the duty ratios of S5 and S6.
The duty ratio of each switch tube can be adjusted through the PI regulator, so that the exciting current and the bus voltage of the output side of the DC/DC converter in a driving operation state are adjusted, the dynamic response process of the system is influenced by the parameters of the PI regulator, power feed-forward regulation can be added into the controller, the dynamic response process is conveniently and rapidly realized, the stability of the system is improved, and finally the duty ratio of each switch tube, the exciting current and the bus voltage of the output side of the DC/DC converter meet the requirement of the range of the input direct current voltage of the given three-phase bridge converter.
In a driving mode, position signals of a doubly salient motor need to be acquired, an inverter switching tube S7-S12 of a three-phase bridge converter is switched on and off according to switch conducting logic of a traditional driving electrically-excited doubly salient motor, current of a three-phase armature winding is detected through a current sensor to carry out closed-loop control, and then the motor is controlled by an instruction to output electromagnetic torque.
In the charging mode, the switch K is switched1The charging and discharging DC/DC converter is switched to a Buck converter, the three-phase bridge converter works in a PWM rectifier mode to convert three-phase alternating current into direct current, and the direct current is reduced by the Buck converter to be supplied to the storage batteryAnd (6) charging.
The S4 tube works in a PWM chopping mode, the S6 tube is switched on, the S1 tube, the S2 tube, the S3 tube and the S5 tube are switched off, and the split excitation windings F1 and F2 are equivalently connected in series in a reverse direction, so that the demagnetization function of the electro-excitation double-salient motor is realized.
The main control circuit controls the switching tubes S1-S6 by adjusting the duty ratio D. It can be known from the relationship Vo = DVi between the input voltage and the output voltage that we can achieve the voltage reduction effect by only controlling the duty ratio D of the switching tube (defined as the ratio of the on-time of the pulse waveform of the control power tube to the period thereof, which is always smaller than 1). When the charging current of the battery is larger, the duty ratio is reduced; when the charging current is small, the duty ratio is increased.
Test example one:
controlling an electro-magnetic doubly salient motor driving and charging integrated system with a split type excitation winding according to a specific implementation mode, simulating a motor driving process, and giving simulation parameters: the output end of the DC/DC converter is given with a voltage of 250V; the motor adopts an 12/10-pole electro-magnetic doubly salient motor, the self inductance of an armature winding of the motor is a constant value of 10mH, the mutual inductance between armature windings is a constant value of 4.6mH, the self inductance of a split type excitation winding is a constant value of 210mH, the mutual inductance between excitation windings is 0mH, the resistance of the armature winding is 0.23 omega, and the resistance of the excitation winding is 6.2 omega; the motor is given with the rotating speed of 600rpm, the current of each section of excitation winding is given with the current of 25A, the motor is provided with a constant torque load, and the rotational inertia of the motor is 20 kg.m2And the capacitance value of the capacitor in the circuit is 1.5 mF. The current simulation waveform of the split excitation winding F1 in the motor driving process is shown in fig. 5, the voltage simulation waveform of the output side of the DC/DC converter is shown in fig. 6, and the motor rotation speed simulation waveform is shown in fig. 7. Wherein, the first 0.4s of the simulation waveform is the transient process when the motor is started and accelerated, and the last 0.4s is the condition when the exciting current of the motor, the output voltage of the DC/DC converter and the rotating speed of the motor all reach the steady state.
As shown in fig. 5, there is a ripple in the current during driving, which is caused by commutation of the armature winding current and mutual inductance between the armature winding and the field winding, and which is also present in the conventional system of controlling the field current in a separate excitation manner. As shown in fig. 6, when the motor is in an acceleration state, the output voltage of the DC/DC converter may overshoot by a certain amount, but then the output voltage may be stabilized around a given voltage due to the voltage closed-loop control. As shown in fig. 7, the motor can achieve a relatively stable acceleration process in the test example, and eventually stabilize to around a given rotation speed.
The test example verifies that the system disclosed by the invention can realize the control of the motor exciting current and the motor driving voltage under the condition that the split exciting winding is integrated with the DC/DC converter inductor, so that the motor can be normally driven.
Test example two:
controlling an electro-magnetic doubly salient motor driving and charging integrated system with a split type excitation winding according to a specific implementation mode, carrying out high-power charging simulation after connecting a three-phase power grid, and giving simulation parameters: the motor adopts an 12/10-pole electro-magnetic doubly salient motor, the self inductance of an armature winding of the motor is a constant value of 10mH, the mutual inductance between armature windings is a constant value of 4.6mH, the self inductance of a split type excitation winding is a constant value of 210mH, the mutual inductance between excitation windings is 0mH, the resistance of the armature winding is 0.23 omega, and the resistance of the excitation winding is 6.2 omega; given the charging current 3A, the capacitance voltage of the DC/DC converter is 135V, and the capacitance value is 0.15 mF.
The simulation waveform of the armature current of the motor in the charging mode is shown in fig. 8, wherein the three-phase armature current can be subjected to sine by SPWM control, and higher harmonics exist in the current due to no filtering of an EMI filter.
The simulation waveform of the battery charging current in the charging mode is shown in fig. 9, and it can be seen that the current will eventually stabilize at about 3A.
The test example verifies that the system disclosed by the invention can realize high-speed and high-power charging of the battery through a three-phase power grid.
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.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. An electro-magnetic doubly salient motor driving and charging integrated system is characterized by comprising a storage battery, first to sixth switching tubes, a first change-over switch, an electro-magnetic doubly salient motor, a direct-current filter capacitor, a three-phase bridge converter, an EMI filter and a second change-over switch;
the excitation winding of the electric excitation doubly salient motor is cut off and divided into two sections with equal length, namely a first excitation winding section and a second excitation winding section, and the three-phase armature winding of the electric excitation doubly salient motor is of an open structure;
the second change-over switch is a three-phase single-pole double-throw switch, one side of the second change-over switch is connected with an external power grid through an EMI filter, and the other side of the second change-over switch is correspondingly connected with one end of a three-phase armature winding of the electro-magnetic doubly salient motor; the other end of the three-phase armature winding of the electro-magnetic doubly salient motor is correspondingly connected with the middle points of three bridge arms of the three-phase bridge type converter respectively;
the first to sixth switching tubes, the first change-over switch, the first excitation winding section and the second excitation winding section form a charging and discharging DC/DC converter, wherein the first to third switching tubes are sequentially connected in series to form an input bridge arm of the charging and discharging DC/DC converter, and the fourth to sixth switching tubes are sequentially connected in series to form an output bridge arm of the charging and discharging DC/DC converter; one end of the first excitation winding section is connected with the middle points of the first switching tube and the second switching tube, and the other end of the first excitation winding section is connected with the middle points of the fourth switching tube and the fifth switching tube; one end of the second excitation winding section is connected with the middle points of the second switching tube and the third switching tube, and the other end of the second excitation winding section is connected with the middle points of the fifth switching tube and the sixth switching tube; the emitter of the third switching tube is connected with the emitter of the sixth switching tube through a first change-over switch;
the first to sixth switching tubes are all anti-parallel diodes;
two ends of an input bridge arm of the charging and discharging DC/DC converter are connected with two ends of the storage battery, and two ends of an output bridge arm of the charging and discharging DC/DC converter are cascaded with the three-phase bridge converter through the direct current filter capacitor.
2. The control method of the integrated system of driving and charging an electro-magnetic double-salient motor according to claim 1, wherein the control method when the integrated system of driving and charging an electro-magnetic double-salient motor is in a driving mode is as follows:
the second change-over switch is closed, the tail end of a three-phase armature winding of the electric excitation double-salient motor is short-circuited to form a star connection mode, the EMI filter does not work, and the connection with a power grid is disconnected;
the first change-over switch is closed, the charging and discharging DC/DC converter is switched to a Boost converter, the charging and discharging DC/DC converter works in a Boost mode, the first switch tube and the second switch tube are switched on, the third switch tube and the fourth switch tube are switched off, the fifth switch tube and the sixth switch tube work in a PWM chopping mode, the first excitation winding section and the second excitation winding section are connected in parallel in an equivalent mode, at the moment, the charging and discharging DC/DC converter promotes the voltage of a storage battery, and the motor is driven to run by the rear-stage three-phase bridge converter.
3. The control method of the integrated system of driving and charging an electro-magnetic double-salient motor according to claim 1, wherein the control method when the integrated system of driving and charging an electro-magnetic double-salient motor is in a charging mode is as follows:
the second change-over switch is opened, and the tail end of a three-phase armature winding of the electric excitation doubly salient motor is connected with an EMI filter and is equivalent to a three-phase filter inductor;
when the system is in a charging mode, the first switch is turned on, the charging and discharging DC/DC converter is switched to a Buck converter, the fourth switch tube works in a PWM chopping mode, the sixth switch tube is turned on, the first, second, third and fifth switch tubes are turned off, the first excitation winding section and the second excitation winding section are equivalently and reversely connected in series, the demagnetization function of the electro-excitation double-salient motor is realized, the three-phase bridge converter works in the PWM rectifier mode, three-phase alternating current is converted into direct current, and the direct current is reduced by the Buck converter to charge the storage battery.
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