CN117060810A - Motor winding switching device, control method and motor system - Google Patents

Motor winding switching device, control method and motor system Download PDF

Info

Publication number
CN117060810A
CN117060810A CN202311150881.0A CN202311150881A CN117060810A CN 117060810 A CN117060810 A CN 117060810A CN 202311150881 A CN202311150881 A CN 202311150881A CN 117060810 A CN117060810 A CN 117060810A
Authority
CN
China
Prior art keywords
phase
winding
motor
low
speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311150881.0A
Other languages
Chinese (zh)
Inventor
章恒亮
胡铭觐
余依洋
花为
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southeast University
Original Assignee
Southeast University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN202311150881.0A priority Critical patent/CN117060810A/en
Publication of CN117060810A publication Critical patent/CN117060810A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/22—Multiple windings; Windings for more than three phases
    • 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
    • H02P27/08—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 with pulse width modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The application belongs to the technical field of six-phase motors and three-phase motors, and discloses a motor winding switching device, a control method and a motor system, wherein the motor is a six-phase motor, the six-phase winding component of the motor is divided into two parts, each part is three phases, wherein the three phases are high-speed and low-speed driving windings, the other three phases are low-speed driving windings, the high-speed and low-speed driving windings are connected in series with the low-speed driving windings, one end of the high-speed and low-speed driving windings is connected with a three-phase bridge inverter I, and the other end of the high-speed and low-speed driving windings is connected with a three-phase bridge inverter II; one end of the low-speed driving winding is connected with the three-phase bridge type inverter II, and the other end of the low-speed driving winding is connected with the winding switching circuit to form a speed switching circuit. The six-phase and three-phase switching can be formed, the function of a two-gear mechanical gearbox is realized, the low-speed large-torque output is realized, the weak magnetic depth at high speed is reduced, and the high-efficiency driving in a wide rotating speed range is realized.

Description

Motor winding switching device, control method and motor system
Technical Field
The application belongs to the technical field of six-phase motors and three-phase motors, and particularly relates to a motor winding switching device, a control method and a motor system.
Background
With the development of the age, multiphase motors are getting more and more attention in the industry, and are particularly suitable for application occasions requiring high power and high reliability, such as application fields of aerospace, ship propulsion, electric automobiles and the like. Six-phase motors have significant advantages in many multi-phase motors because six torque ripple can be eliminated by two sets of three-phase windings.
For new energy electric vehicles, the performance requirements on the driving motor system are different under different working conditions.
When the vehicle starts accelerating from zero speed/low speed, or is started on a slope, etc., the vehicle speed or the motor speed is relatively low, and a large torque is required to overcome the friction force or the weight component of the vehicle itself. Since the output electromagnetic torque of the permanent magnet synchronous motor is in direct proportion to the flux linkage, which is in direct proportion to the number of turns of the coil, the increase of the number of turns of the coil is helpful for increasing the output torque of the permanent magnet synchronous motor.
While the system generally requires less torque during high-speed cruising of an automobile, in order to enable the motor to be driven at high speed, it is necessary to magnetically control the motor by a controller. The voltage level of the vehicle-mounted battery is limited, the counter potential generated by the permanent magnet in the permanent magnet motor is increased along with the increase of the rotating speed, when the counter potential reaches the upper voltage limit, the rotating speed of the motor cannot be continuously increased, the direct-axis demagnetizing current is required to be increased in a field weakening control mode, but loss is increased, and when the field weakening is performed in depth, the permanent magnet has the demagnetizing risk, so that the field weakening range is reasonably selected.
In the prior art, patent CN201310041277.4 proposes a technique for switching windings at high and low speeds. The stator coil is divided into two parts, and current passes through all coil wires during low-speed rotation and through part of coil wires during high-speed rotation. However, the full-control device IGBT is used in the technology, so that the cost is high, overvoltage can be generated in the active turn-off process, and winding insulation and an IGBT tube are damaged; the RC buffer circuit in the switching circuit increases the complexity of the system on one hand, and the capacitor is quite large on the other hand, and is quite fragile, so that the capacitor has a fault risk under overvoltage impact. Patent CN201810458487.6 proposes a three-phase motor winding switching device and control method, but two sets of three-phase uncontrolled rectifier bridges with thyristors are needed in the winding switching circuit. Thyristors are more expensive than ordinary diodes and in case of failure, the presence of two thyristors can present difficulties for maintenance and troubleshooting. In some schemes, two sets of power supplies or two thyristors are used, so that more cost and larger space are consumed in building an actual circuit.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide a motor winding switching device, a control method and a motor system, which can use an electronic circuit to play the role of a two-gear mechanical gearbox, so that the motor can provide large torque by increasing the number of turns in a lower rotating speed area; the motor works by converting a six-phase motor into a three-phase motor in a high-speed area, the number of winding turns is reduced, so that counter electromotive force generated by the motor is reduced, the constant torque operation range of the motor is widened, the speed regulation range of the motor is widened under the condition that the weak magnetic depth is not increased, and the motor can normally operate in both the high-speed area (a rotating speed interval corresponding to a three-phase operation state, namely, an n-n 4 interval) and the low-speed area (a rotating speed interval corresponding to the six-phase operation state, namely, an 0-n interval). Meanwhile, the number of controllable switching devices T1 (such as thyristors, MOS tubes, IGBT, bidirectional switching tubes and the like) and power supplies in the control circuit is reduced, and the difficulty of maintenance, replacement and fault elimination is reduced while the cost is controlled.
The high-speed region is a speed region in which the switching circuit controllable switching device T1 operates after being disconnected, namely, the motor operates in a three-phase state, namely, a region from n to n4. The low-speed region is a speed region in which the controllable switching device T1 is operated when closed, i.e. the motor is operated in a six-phase state, i.e. a 0-n region.
The aim of the application can be achieved by the following technical scheme:
the motor winding switching device comprises a six-phase motor, wherein the six-phase winding component of the motor is divided into two parts, each part is three phases, the three phases are high-speed and low-speed driving windings, the other three phases are low-speed driving windings, the high-speed and low-speed driving windings are connected in series with the low-speed driving windings, one end of the high-speed and low-speed driving windings is connected with a first three-phase bridge type inverter, and the other end of the high-speed and low-speed driving windings is connected with a second three-phase bridge type inverter;
one end of the low-speed driving winding is connected with the three-phase bridge type inverter II, and the other end of the low-speed driving winding is connected with the winding switching circuit to form a speed switching circuit.
Further, the first three-phase bridge inverter is connected in parallel with the second three-phase bridge inverter.
Further, the three-phase bridge inverter I comprises six transistors, the six transistors are equally divided into three groups, each group of two transistors are connected in series, and the three groups of transistors are connected in parallel; the structure of the three-phase bridge inverter II is the same as that of the three-phase bridge inverter I.
Further, the winding switching circuit is formed by connecting a three-phase uncontrolled rectifier bridge with a controllable switching device T1 in parallel;
the three-phase uncontrolled rectifier bridge comprises six diodes, wherein the six diodes are evenly divided into three groups, two diodes of each group are connected in series, and the three groups of diodes are connected in parallel.
Further, the high-speed and low-speed driving windings are connected in series with the low-speed driving windings.
Further, one end of an A-phase winding in the high-speed and low-speed driving winding is connected with two transistors of a first group in the three-phase bridge inverter I, and the other end of the A-phase winding is connected with two transistors of the first group in the three-phase bridge inverter II; one end of a B-phase winding in the high-speed and low-speed driving winding is connected with two transistors of a second group in the first three-phase bridge inverter, and the other end of the B-phase winding is connected with two transistors of the second group in the second three-phase bridge inverter; one end of a C-phase winding in the high-low speed driving winding is connected with two transistors of a third group in the first three-phase bridge inverter, and the other end of the C-phase winding is connected with two transistors of the third group in the second three-phase bridge inverter.
Further, one end of an X-phase winding in the low-speed driving winding is connected with two transistors of a first group in the three-phase bridge inverter II, and the other end of the X-phase winding is connected with two diodes of the first group in the three-phase uncontrolled rectifier bridge; one end of a Y-phase winding in the low-speed driving winding is connected with two transistors of a second group in the three-phase bridge type inverter II, and the other end of the Y-phase winding is connected with two diodes of the second group in the three-phase uncontrolled rectifier bridge; one end of a Z-phase winding in the low-speed driving winding is connected with two transistors of a third group in the three-phase bridge type inverter II, and the other end of the Z-phase winding is connected with two diodes of the third group in the three-phase uncontrolled rectifier bridge.
Further, the high and low speed drive windings have the same number of turns as the low speed drive windings.
When the motor runs at low speed, the motor controller sends switching signals to the first three-phase bridge type inverter and the second three-phase bridge type inverter, and simultaneously sends signals to the controllable switching device T1, so that the controllable switching device T1 is conducted, the neutral point of the low-speed driving winding is connected by using the three-phase uncontrolled rectifier bridge, at the moment, all windings participate in working to generate large torque, and the maximum torque can reach T1;
when the rotating speed of the motor is increased to an interval of n 1-n, the counter potential value of the motor is equal to the power supply voltage, the direct-axis demagnetizing current is required to be increased at the moment, the balance of the voltage in high-speed operation is maintained, and the rotating speed of the motor is increased in a weak magnetic speed expansion mode;
as the running speed of the motor increases to n, the controllable switching device T1 receives a signal to be disconnected, the low-speed driving winding is disconnected immediately, the high-speed driving winding, the low-speed driving winding, the three-phase bridge inverter I and the three-phase bridge inverter II continue to work, the motor is changed from six phases to three phases, the counter potential is also reduced as the number of turns of the motor is reduced, the value of the power supply voltage is larger than or equal to the counter potential value generated by the motor, the motor works in a constant torque interval again, and the rotating speed is not required to be increased through weak magnetic control;
when the rotating speed of the motor is greater than n3, the direct-axis demagnetizing current of the three-phase motor needs to be increased, and the maximum rotating speed n4 is achieved again by using a weak magnetic control method.
An electric motor system comprising:
a rotor; and
a stator including a low-speed driving winding used only during low-speed driving, a high-low speed driving winding used during both low-speed driving and high-speed driving, and a plurality of slots provided for each pole of each phase,
wherein the low-speed drive winding and the high-low-speed drive winding are wound in a different slot corresponding to each pole of each phase in a distributed manner.
The application has the beneficial effects that:
1. the controllable switching device T1 is controlled to be turned on and off according to the system requirement, so that the switching between the six-phase motor and the three-phase motor is realized, the effect of a two-gear gearbox is achieved, and the motor can be operated at a low speed and a large torque and also can be operated at a high speed and high efficiency.
2. The motor can work in a constant torque interval in a low-speed mode and a high-speed mode, so that the weak magnetic depth of the motor can be reduced, the speed interval in which the motor can operate is enlarged, and the efficiency of the motor during operation is improved.
3. Because the controllable switching device T1 is automatically turned off when the current is zero, a buffer circuit is not needed, and the risks of out-of-control switching and overvoltage generated by active turn-off of the IGBT due to the failure of the buffer circuit device are avoided.
4. Because only one winding switching circuit is used, only six diodes and controllable switching devices T1 are included, the cost for controlling components is reduced, and when the winding switching circuit fails, the failure can be rapidly removed and the failed devices can be replaced, so that the overhaul difficulty is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a general block diagram of a six-phase motor winding switching device and control system according to an embodiment of the present application;
FIG. 2 is a linear plot of the output mechanical characteristics of a six-phase motor according to an embodiment of the present application;
fig. 3 is a linear diagram of the output mechanical characteristics of a three-phase motor according to an embodiment of the present application;
fig. 4 is a linear graph of the output mechanical characteristics of the motor after the device of the embodiment of the application.
Description of the drawings: 1. a three-phase bridge inverter I; 2. a three-phase bridge inverter II; 3. a motor stator winding; 4. a winding switching circuit.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "open," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like indicate orientation or positional relationships, merely for convenience in describing the present application and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Example 1
As shown in fig. 1, a motor winding switching device is a six-phase motor, the six-phase winding component of the motor is divided into two parts, each part is three phases, wherein the three phases are high-speed and low-speed driving windings, the other three phases are low-speed driving windings, the high-speed and low-speed driving windings are connected in series with the low-speed driving windings, one end of the high-speed and low-speed driving windings is connected with a three-phase bridge inverter 1, and the other end of the high-speed and low-speed driving windings is connected with a three-phase bridge inverter 2;
one end of the low-speed driving winding is connected with the three-phase bridge type inverter II 2, and the other end of the low-speed driving winding is connected with the winding switching circuit 4 to form a speed switching circuit.
It should be noted that, the six phases of the motor stator winding 3 are divided into two parts, each part is three-phase, wherein one part of the three-phase windings is connected between the first three-phase bridge inverter 1 and the second three-phase bridge inverter 2, the three-phase windings are respectively denoted as A, B, C, the whole is denoted as high-low speed driving windings, the other part of the three-phase windings is connected between the second three-phase bridge inverter 2 and the winding switching circuit 4, the three-phase windings are respectively denoted as X, Y, Z, and the whole is denoted as low speed driving windings.
In the illustration of the present application, a three-phase bridge inverter 1 is connected in parallel with a three-phase bridge inverter 2. The three-phase bridge inverter 1 comprises six transistors, wherein the six transistors are uniformly divided into three groups, two transistors in each group are connected in series, and three groups of transistors are connected in parallel; similarly, the three-phase bridge inverter two 2 and the three-phase bridge inverter one 1 have the same structure.
In the illustration of the present application, the winding switching circuit 4 is composed of a three-phase uncontrolled rectifier bridge in parallel with a controllable switching device T1 (e.g., MOS transistor, thyristor, IGBT, bi-directional switching transistor, etc.). The three-phase uncontrolled rectifier bridge comprises six diodes, wherein the six diodes are evenly divided into three groups, two diodes of each group are connected in series, and the three groups of diodes are connected in parallel.
In the illustration of the present application, the high and low speed drive windings are connected in series with each other.
In the illustration of the application, one end of an A-phase winding in a high-speed and low-speed driving winding is connected with two transistors of a first group in a first three-phase bridge inverter 1, and the other end of the A-phase winding is connected with two transistors of the first group in a second three-phase bridge inverter 2; one end of a B-phase winding in the high-speed and low-speed driving winding is connected with two transistors of a second group in the first three-phase bridge inverter 1, and the other end of the B-phase winding is connected with two transistors of the second group in the second three-phase bridge inverter 2; one end of a C-phase winding in the high-speed and low-speed driving winding is connected with two transistors of a third group in the first three-phase bridge inverter 1, and the other end of the C-phase winding is connected with two transistors of the third group in the second three-phase bridge inverter 2.
In the illustration of the application, one end of an X-phase winding in the low-speed driving winding is connected with two transistors of a first group in a second three-phase bridge type inverter 2, and the other end is connected with two diodes of the first group in a three-phase uncontrolled rectifier bridge; one end of a Y-phase winding in the low-speed driving winding is connected with two transistors of a second group in a second three-phase bridge type inverter 2, and the other end of the Y-phase winding is connected with two diodes of the second group in the three-phase uncontrolled rectifier bridge; one end of a Z-phase winding in the low-speed driving winding is connected with two transistors of a third group in the second three-phase bridge type inverter 2, and the other end of the Z-phase winding is connected with two diodes of the third group in the three-phase uncontrolled rectifier bridge.
Specifically, the number of turns of the high-speed driving winding and the low-speed driving winding is the same as N.
Specifically, the high-speed driving winding and the low-speed driving winding are connected in series, and a winding switching circuit 4 comprising a three-phase uncontrolled rectifier bridge and a controllable switching device T1 (such as MOS tube, thyristor, IGBT, bidirectional switching tube, etc.) is used for completing the switching between the six-phase winding and the three-phase winding.
Fig. 2 shows that the windings are in series connection, namely, the output mechanical characteristic of the six-phase motor, because the number of windings is large, high back electromotive force can be generated at high speed, the rotating speed can only reach n2 under the field weakening control, and the high rotating speed n4 required by application cannot be reached.
Fig. 3 shows the output mechanical characteristics of a three-phase motor, in which the counter potential formed by the motor is smaller at the same rotation speed due to the small number of winding turns, and the required high rotation speed n4 can be achieved, but the high torque T1 cannot be output at low speed.
Example two
As shown in fig. 1 and 4, the control method of the motor winding switching device of the present application. When the motor runs at a low speed, the motor controller sends a trigger signal to a controllable switching device T1 in a winding switching circuit 4 while sending PWM working signals to a three-phase bridge inverter I1 and a three-phase bridge inverter II 2, so that the controllable switching device T1 is subjected to positive pressure conduction, and the lower end point of a low-speed driving winding is short-circuited by using a three-phase uncontrolled rectifier bridge; at this time, all windings participate in working, the motor works in a six-phase motor state, large torque is generated, and the maximum torque can reach T1.
As the running speed of the motor increases to the n 1-n interval, the counter potential of the motor increases, the six-phase motor enters a weak magnetic state, and the counter potential generated by the motor is reduced by increasing the direct-axis demagnetizing current, so that the speed of the motor is increased. The maximum torque value that can be output decreases from T1.
When the motor speed rises to n, the intersection point of the six-phase motor external characteristic curve and the three-phase motor external characteristic occurs. When the current is attenuated to zero by the motor controller, the trigger signal of the controllable switch device T1 is removed, so that the current flowing through the controllable switch device is reduced to be lower than the maintaining current, the controllable switch device T1 is turned off, the low-speed driving winding is immediately turned off, and the motor is converted into a three-phase motor. At this time, the high and low speed driving windings in the motor normally operate. Because the low-speed driving winding is disconnected, the winding turns are reduced, so that the counter potential of the motor is also reduced, the rotating speed does not need to be increased in a weak magnetic mode at the rotating speed, the motor is restarted in a constant torque interval, and the maximum torque can reach T2.
When the rotating speed of the motor rises to n3, the counter potential value of the motor is equal to the power supply voltage value, and the three-phase motor enters the weak magnetic speed expansion section. Because the number of turns is smaller, the weak magnetic depth is also reduced.
When the motor speed returns to n and below, the motor controller sends an opening signal to the T1 again, and the low-speed driving winding is connected again, so that the motor returns to the working state of the six-phase motor again.
According to the application, the controllable switching device T1 is blocked by the pulse through the frequency converter and is turned off passively, so that the winding is always switched in a zero current state, a buffer circuit is not needed, and the risks of out-of-control switching and overvoltage generated by active turn-off of the IGBT due to the failure of the buffer circuit device are avoided.
Example III
An electric motor system comprising:
a rotor; and
a stator including a low-speed driving winding used only during low-speed driving, a high-low speed driving winding used during both low-speed driving and high-speed driving, and a plurality of slots provided for each pole of each phase,
wherein the low-speed drive winding and the high-low-speed drive winding are wound in a different slot corresponding to each pole of each phase in a distributed manner.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined in the appended claims.

Claims (10)

1. The motor winding switching device is characterized in that one end of the high-low speed driving winding is connected with a first three-phase bridge type inverter (1), and the other end of the high-low speed driving winding is connected with a second three-phase bridge type inverter (2);
one end of the low-speed driving winding is connected with the three-phase bridge type inverter II (2), and the other end of the low-speed driving winding is connected with the winding switching circuit (4) to form a speed switching circuit.
2. A motor winding switching device according to claim 1, characterized in that the three-phase bridge inverter one (1) is connected in parallel with the three-phase bridge inverter two (2).
3. A motor winding switching apparatus according to claim 2, wherein the three-phase bridge inverter one (1) includes six transistors equally divided into three groups of two transistors each connected in series, and three groups of transistors are connected in parallel; the three-phase bridge inverter II (2) has the same structure as the three-phase bridge inverter I (1).
4. A motor winding switching arrangement according to claim 3, characterized in that the winding switching circuit (4) is constituted by a three-phase uncontrolled rectifier bridge in parallel with a controllable switching device T1;
the three-phase uncontrolled rectifier bridge comprises six diodes, wherein the six diodes are evenly divided into three groups, two diodes of each group are connected in series, and the three groups of diodes are connected in parallel.
5. The motor winding switching device of claim 4, wherein the high and low speed drive windings are connected in series with the low speed drive winding.
6. The switching device for motor windings according to claim 5, wherein one end of the a-phase winding of the high-low speed driving winding is connected between the two transistors of the first group of the three-phase bridge inverter one (1), and the other end is connected between the two transistors of the first group of the three-phase bridge inverter two (2); one end of a B-phase winding in the high-low speed driving winding is connected with two transistors of a second group in the first three-phase bridge inverter (1), and the other end of the B-phase winding is connected with two transistors of the second group in the second three-phase bridge inverter (2); one end of a C-phase winding in the high-speed and low-speed driving winding is connected with two transistors of a third group in the first three-phase bridge inverter (1), and the other end of the C-phase winding is connected with two transistors of the third group in the second three-phase bridge inverter (2).
7. The switching device for motor windings according to claim 5, wherein one end of the X-phase winding in the low-speed driving winding is connected between the two transistors of the first group in the second three-phase bridge inverter (2), and the other end is connected between the two diodes of the first group in the three-phase uncontrolled rectifier bridge; one end of a Y-phase winding in the low-speed driving winding is connected with two transistors of a second group in the three-phase bridge type inverter II (2), and the other end of the Y-phase winding is connected with two diodes of the second group in the three-phase uncontrolled rectifier bridge; one end of a Z-phase winding in the low-speed driving winding is connected with two transistors of a third group in the second three-phase bridge type inverter (2), and the other end of the Z-phase winding is connected with two diodes of the third group in the three-phase uncontrolled rectifier bridge.
8. A motor winding switching apparatus according to claim 1, wherein the high and low speed drive windings have the same number of turns as the low speed drive windings.
9. The control method of a motor winding switching device according to any one of claims 1 to 8, wherein when the motor is running at a low speed, the motor controller sends a switching signal to the three-phase bridge inverter one (1) and the three-phase bridge inverter two (2) and simultaneously sends a signal to the controllable switching device T1, so that the controllable switching device T1 is turned on, and the three-phase uncontrolled rectifier bridge is used for connecting the neutral point of the low-speed driving winding, and at this time, all windings participate in working to generate a large torque, and the maximum torque can reach T1;
when the rotating speed of the motor is increased to an interval of n 1-n, the counter potential value of the motor is equal to the power supply voltage, the direct-axis demagnetizing current is required to be increased at the moment, the balance of the voltage in high-speed operation is maintained, and the rotating speed of the motor is increased in a weak magnetic speed expansion mode;
as the running speed of the motor increases to n, the controllable switching device T1 receives a signal to be disconnected, the low-speed driving winding is disconnected immediately, the high-speed driving winding, the low-speed driving winding, the three-phase bridge inverter I (1) and the three-phase bridge inverter II (2) continue to work, the motor is changed from six phases to three phases, and the counter potential is reduced along with the reduction of the number of turns of the motor at the moment, so that the value of the power supply voltage is larger than or equal to the counter potential value generated by the motor, the motor is restarted in a constant torque interval, and the rotating speed is not required to be increased through weak magnetic control;
when the rotating speed of the motor is greater than n3, the direct-axis demagnetizing current of the three-phase motor needs to be increased, and the maximum rotating speed n4 is achieved again by using a weak magnetic control method.
10. An electric motor system, comprising:
a rotor; and
a stator including a low-speed driving winding used only during low-speed driving, a high-low speed driving winding used during both low-speed driving and high-speed driving, and a plurality of slots provided for each pole of each phase,
wherein the low-speed drive winding and the high-low-speed drive winding are wound in a different slot corresponding to each pole of each phase in a distributed manner.
CN202311150881.0A 2023-09-07 2023-09-07 Motor winding switching device, control method and motor system Pending CN117060810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311150881.0A CN117060810A (en) 2023-09-07 2023-09-07 Motor winding switching device, control method and motor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311150881.0A CN117060810A (en) 2023-09-07 2023-09-07 Motor winding switching device, control method and motor system

Publications (1)

Publication Number Publication Date
CN117060810A true CN117060810A (en) 2023-11-14

Family

ID=88664471

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311150881.0A Pending CN117060810A (en) 2023-09-07 2023-09-07 Motor winding switching device, control method and motor system

Country Status (1)

Country Link
CN (1) CN117060810A (en)

Similar Documents

Publication Publication Date Title
Jiang et al. Short-circuit fault-tolerant operation of dual-winding permanent-magnet motor under the four-quadrant condition
Huang et al. A single sided matrix converter drive for a brushless DC motor in aerospace applications
CN109450340B (en) Control method of excitation double salient pole motor field failure fault-tolerant power generation system
CN110061678B (en) Electro-magnetic doubly salient motor driving and charging integrated system
EP2031749B1 (en) On-vehicle rotary electric machine operating on two modes of rectification
CN101085603B (en) Hybrid vehicle
CN100574086C (en) The Y shape switch converters that is used for EHV electric and hybrid vehicle
CN102812238A (en) Pitch drive device capable of emergency operation for a wind or water power plant
CN111342736B (en) Variable winding driving system of switched reluctance motor and online soft switching method
CN108123646B (en) Excitation fault-tolerant power generation system of doubly salient electro-magnetic motor and control method thereof
CN110798121B (en) Thyristor-based magnetic field modulation switched reluctance motor driving system and control method
CN108400742B (en) Double-winding three-phase motor and control method thereof
CN106849824B (en) Electric drive device, electric drive system, and electric apparatus
US10903772B2 (en) Multigroup-multiphase rotating-electric-machine driving apparatus
EP2374192A1 (en) Method for operation of a permanent magnet synchronous machine, and a device in an electric system comprising such a machine
CN105048900A (en) Frequency multiplication chopping control circuit for double-winding high-speed brushless DC motor and winding switching control method
JP2015164385A (en) Variable-speed electric machine
Hao et al. A switched reluctance motor drive system for storage battery electric vehicle in coal mine
CN117060810A (en) Motor winding switching device, control method and motor system
CN108418497B (en) Segmented winding motor controller and control method
Alosa et al. Reconfigurable multi-three-phase propulsion system for naval rim-driven propeller
Li et al. Fault-tolerant control for 5L-HNPC inverter-fed induction motor drives with finite control set model predictive control based on hierarchical optimization
Shi et al. Fault-Tolerant Control of Doubly Salient Electromagnetic Generator Based on Capacitor Split-Phase Bridge Converter Under Loss of Excitation
CN208754089U (en) A kind of machine winding switching device
CN217037074U (en) Four-segment winding motor switching circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination