CN108923594A

CN108923594A - A kind of three phase alternating current motor

Info

Publication number: CN108923594A
Application number: CN201811094616.4A
Authority: CN
Inventors: 王伟; 李玉刚; 花为; 卜言柱; 刘亚军; 胡宜豹; 何金城; 刘竹园; 李升�; 程兴; 张力; 胡金龙; 周建华; 王庆; 周维; 丁建国; 庾杰
Original assignee: Wuxi Race Power Technology Co Ltd
Current assignee: Wuxi Race Power Technology Co Ltd
Priority date: 2018-09-19
Filing date: 2018-09-19
Publication date: 2018-11-30

Abstract

The invention discloses a kind of three phase alternating current motor, the stator of the three phase alternating current motor has a stator slot of 3 × n multiple, n be greater than 0 and non-1 positive integer；The stator slot is formed by every two adjacent stator tooth；Wherein, the stator includes 2 or 2 or more winding elements, and each winding element is wound around respectively on the different stator tooths；Each winding element is electrically connected with its corresponding motor drive unit respectively, and each motor drive unit is for carrying out operation control to the winding element of corresponding electrical connection；The present invention efficiently solves single large capacity drive device there are performances unreliable, at high cost and poor serious forgiveness problem, while wire winding is simple, not will increase stator insulation performance requirement standard.

Description

Three-phase alternating current motor

Technical Field

The invention belongs to the field of motors, and particularly relates to a three-phase alternating current motor.

Background

As described in the background of the patent application of chinese invention with publication number CN 102497055A: the traditional motor, especially the medium and high power motors, is used as the important component of the motor driving system, in the practical application, a single large-capacity power supply driver is generally adopted to directly drive the motor, or a plurality of small-capacity drivers are adopted to drive the motor in parallel, namely, a plurality of paths of small-capacity drivers are combined into a large-capacity driver; the driver can be directly connected with the motor, the structure is simple, but because the traditional motor is in a single-winding structure, the reliability of the high-capacity driver and the reliability of the traditional motor are reduced to different degrees under a complex application environment, and when any one of the winding or the driver has a problem in the running process of the system, the system can be broken down and can not work at all; and each small-capacity driver is connected with the motor through a reactance network, so that the structure is complex, the reliability is not high under a complex application environment, and particularly, if the motor has problems, the system can not work completely. Therefore, the motor driving system of the existing medium and high power motors has low reliability and high cost.

In order to solve the above technical problems, chinese patent application publication No. CN102497055A proposes that a plurality of sets of windings are wound on a stator of a motor in parallel, and the exterior of each set of functional windings is connected with a corresponding driver or powered by an ac power supply, and all the sets of functional windings can work independently to enable the motor to operate normally.

However, the applicant finds that the winding process is complicated due to the design of arranging a plurality of sets of functional windings in the stator, the insulation requirement on the stator slots is high due to the fact that the plurality of sets of windings are arranged in the stator slots at the same time, the insulation is easy to fail, the problem of coil short circuit is caused, the requirement on manufacturing of the stator structure is high, and the reliability of the motor is poor.

It should be noted that CN102497055A adopts multiple small-capacity drivers to control each set of functional windings, and although the problems of unreliable and high cost caused by the use of large-capacity drivers (formed by combining single or multiple small-capacity drivers) are solved to some extent, the applicant of the present invention finds that the use of multiple drivers may cause a difference in relevant parameters between the drivers or a failure of some components, which may cause a control failure or uncontrolled condition of the entire driving system, and the fault tolerance is poor, and when the technology is applied to the field of electric vehicles, it is difficult to implement uniform charging management of the batteries of the drivers due to the difference, and therefore, the technology cannot be applied to the field of electric vehicles;

due to the above technical problems, the technology disclosed in CN102497055A has many technical bottlenecks and is not practically applied, so that the current situation that a medium-power and high-power motor always adopts a large-capacity driver is still not practically improved, which is obviously contrary to the future electric vehicle market development direction that seeks to achieve higher power and high performance at low cost, and therefore the market is very urgently required to solve the above technical problems.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a three-phase ac motor, which adopts a structural design of a plurality of winding units respectively disposed on different stator teeth, so as to effectively solve the problems of unreliable performance, high cost and poor fault tolerance of a single high-capacity driver, and meanwhile, the winding process is simple, and the required standard of the insulation performance of the stator is not increased.

The technical scheme adopted by the invention is as follows:

a three-phase alternating current motor having a stator with a multiple of 3 x n stator slots, n being a positive integer greater than 0 and not 1; the stator slots are formed by every two adjacent stator teeth; the stator comprises 2 or more than 2 winding units, and each winding unit is wound on different stator teeth respectively; each winding unit is electrically connected with the corresponding motor driver unit, and each motor driver unit is used for controlling the operation of the winding unit electrically connected with the corresponding winding unit.

Preferably, the three-phase alternating current motor is a permanent magnet motor or an electrically excited motor.

Preferably, the stator at least includes a first winding unit and a second winding unit, where the phase differences between the three-phase line of the first winding unit and the three-phase line of the second winding unit corresponding to the first winding unit are all equal to 0.

Preferably, the stator at least comprises a first winding unit and a second winding unit, wherein the phase difference between the three-phase line of the first winding unit and the three-phase line of the second winding unit corresponding to the first winding unit is not equal to 0.

Preferably, the phase difference between the three-phase line of the first winding unit and the three-phase line of the corresponding second winding unit is greater than 0 and less than or equal to 60 °.

Preferably, each of the winding units is connected in a star connection or a delta connection.

Preferably, the output power of the three-phase alternating current motor ranges from 120W to 150KW, and the input current of each winding unit ranges from 1 a to 1000A.

Preferably, the magnetic fluxes of the winding units are equal.

Preferably, the three-phase alternating current motor is configured to maintain the magnetic flux when the motor adopts a single winding unit by increasing the number of turns of each winding unit, and the capacity of the motor driver unit is equal to the capacity of the motor driver adopted by the motor adopting the single winding unit/the number of the winding units.

Preferably, the stator comprises at least a first winding unit and a second winding unit, wherein the magnetic fluxes of the first winding unit and the second winding unit are not equal.

The invention also provides a three-phase alternating current motor for the medium-high power device, wherein a stator of the three-phase alternating current motor is provided with stator slots of multiples of 3 multiplied by n, and n is a positive integer which is more than 0 and is not 1; the stator slots are formed by every two adjacent stator teeth; the stator comprises 2 or more than 2 winding units, and each winding unit is wound on different stator teeth respectively; each winding unit is electrically connected with the corresponding motor driver unit, and each motor driver unit is used for controlling the operation of the corresponding electrically connected winding unit; the input power of the medium-high power device is not less than 1 KW.

Preferably, the input power of the medium-high power device is not less than 2 KW.

Preferably, the medium-high power device is an electric vehicle, and the input power range of the electric vehicle is 1KW-150 KW.

Preferably, the electric vehicle is an electric motorcycle, an electric two-wheel vehicle, an electric three-wheel vehicle or an electric four-wheel vehicle.

Preferably, the medium-high power device is an elevator, and the input power of the elevator ranges from 3KW to 50 KW.

The invention also provides a motor driving system, which comprises a three-phase alternating current motor and a controller group for controlling the three-phase alternating current motor, wherein the stator of the three-phase alternating current motor adopts 2 or more than 2 winding units; the controller group comprises motor driver units which are respectively and correspondingly electrically connected with the winding units, and each motor driver unit is used for controlling the operation of the corresponding winding unit; the controller group performs centralized coordination management control on the operation state of each motor driver unit.

Preferably, the controller group comprises at least a first motor driver unit and a second motor driver unit, wherein the first motor driver unit and the second motor driver unit are connected in a bidirectional data communication manner, and the bidirectional data communication connection comprises a sending data communication connection and a receiving data communication connection.

Preferably, the controller group further includes a master controller respectively connected to the motor driver units, and the master controller performs centralized coordination management control on the operating states of the motor driver units; the master controller and the motor driver units are respectively connected in a bidirectional data communication mode, wherein the bidirectional data communication connection comprises a data sending communication connection and a data receiving communication connection.

Preferably, the general controller is connected with an external display device for displaying the running state of each motor driver unit.

Preferably, the master controller comprises a master control MCU main module and a master control communication module connected with the master control MCU main module, and the master control communication module is externally connected with each motor driver unit.

Preferably, the motor driver units each comprise an electrically connected battery and a controller; the controller comprises an MCU main module and a communication module used for communication data connection.

Preferably, the operation state of each motor driver unit refers to operation data of each motor driver unit, including data information of power supply voltage and/or motor rotation speed and/or fault.

Preferably, the centralized coordination management control may intelligently recognize an operation abnormality of each motor driver unit, and take a corresponding control instruction according to an operation abnormality condition, so as to ensure that the motor drive system operates normally.

Preferably, the operation abnormality includes that the difference in the operation states of the motor driver units exceeds a preset value and/or that a certain motor driver unit malfunctions and/or that a certain winding unit malfunctions.

Preferably, the stator of the three-phase alternating current motor has stator slots of multiples of 3 × n, n being a positive integer greater than 0 and not 1; the stator slots are formed by every two adjacent stator teeth; and the winding units are respectively wound on different stator teeth.

Preferably, the winding units are wound on the same stator tooth in parallel.

The invention also provides a control method of the motor drive system, the controller group performs centralized coordination management control on the operation states of the motor driver units, wherein after the centralized coordination management control performs communication summarization on the operation states of the motor driver units, the controller group determines and executes a control instruction according to the summarized operation state information, so as to meet the control requirement of the motor drive system.

Preferably, the controller group further includes a master controller respectively connected to the motor driver units, and the master controller performs centralized coordination management control on the operating states of the motor driver units; the operation steps of the centralized coordination management control comprise:

s10), the motor driver units send respective running states to the master controller;

s20), after receiving the running state information of each motor driver unit, the master controller intelligently identifies the running abnormal condition, takes a corresponding control instruction according to the running abnormal condition and sends the control instruction to the corresponding motor driver unit;

s30), the motor driver unit receiving the control instruction controls the operation of the corresponding winding unit according to the control instruction, and the motor driver unit is used for ensuring the normal operation of the motor driving system.

Preferably, the operating step further comprises: the received operating state information of each motor driver unit is transmitted to an external display device for use as a reference for an external user.

Preferably, the motor driver units each comprise an electrically connected battery and a controller; the operation abnormality comprises that the difference value of the battery voltage data of each motor driver unit exceeds a preset value; when the battery voltage data difference value exceeds a preset value, the controller group adopts the following control instructions: and reducing the output power of the controller correspondingly connected with the low-voltage battery or increasing the output power of the controller correspondingly connected with the high-voltage battery until the battery voltage data difference value of each motor driver unit does not exceed a preset value.

Preferably, the control objective that the battery voltage data difference of each motor driver unit does not exceed a preset value is used to ensure uniform charge management of each motor driver unit at the same time.

Preferably, the operational abnormality includes a failure of a certain one of the motor driver units; wherein, when the operation abnormality is that a certain motor driver unit has a fault, the control instruction taken by the controller group is: the failure information is sent to other motor driver units, and the other motor driver units are instructed to independently perform the motor driving.

Preferably, when the other motor driver units independently perform the motor driving, the motor driver units are used to ensure the normal operation of the motor driving system by selectively adjusting the operation states thereof.

Preferably, the operation abnormality includes a hall element of a certain winding unit being damaged; when the abnormal operation is that a Hall element of a certain winding unit is damaged, the control instruction adopted by the controller group is as follows: and sending the Hall signals of other motor driver units to the motor driver unit corresponding to the winding unit with the damaged Hall element, and instructing the motor driver unit to normally operate by the Hall signals.

The invention also provides a motor driving system for the electric vehicle, which comprises a three-phase alternating current motor and a controller group for controlling the three-phase alternating current motor, wherein a stator of the three-phase alternating current motor adopts 2 or more than 2 winding units, and the three-phase alternating current motor is a permanent magnet motor; the controller group comprises motor driver units which are respectively and correspondingly electrically connected with the winding units, and each motor driver unit is used for controlling the operation of the corresponding winding unit; the controller group performs centralized coordination management control on the running state of each motor driver unit; each motor driver unit comprises a battery and a controller which are electrically connected.

Preferably, the winding units are wound on the same stator tooth in parallel.

Preferably, the operation state of each motor driver unit refers to operation data of each motor driver unit, including data information of battery voltage and/or motor speed and/or fault.

Preferably, the operation abnormality includes that a difference in battery voltage data of the motor driver units exceeds a preset value; when the battery voltage data difference value exceeds a preset value, the controller group adopts the following control instructions: and reducing the output power of the controller correspondingly connected with the low-voltage battery or increasing the output power of the controller correspondingly connected with the high-voltage battery until the battery voltage data difference value of each motor driver unit does not exceed a preset value.

Preferably, the operational abnormality includes a failure of a certain one of the motor driver units; wherein, when the operation abnormality is that a certain motor driver unit has a fault, the control instruction taken by the controller group is: the failure information is sent to other motor driver units, and the other motor driver units are instructed to independently perform motor driving.

Preferably, an electric vehicle comprises an electric vehicle mounting frame body and a motor driving system which are integrally mounted and connected, wherein the motor driving system adopts the motor driving system.

Preferably, the input power range of the electric vehicle is 1KW-150 KW.

It should be noted that, in the three-phase ac motor according to the present invention, the voltage input to the winding unit is three-phase ac voltage, which is not limited to the types of ac and dc, and may be an ac power supply or a dc power supply, wherein the dc power supply may be processed by the controller and then converted into an ac power supply, which are well known and conventional in the art, and will not be described in detail herein.

It should be noted that the input power of the medium-three-phase ac motor is the input power of the medium-high power device to which the three-phase ac motor is applied.

The invention has the advantages that:

1. the invention firstly breaks the thought limitation, adopts the structural design of a plurality of winding units respectively arranged on different stator teeth to the three-phase alternating current motor, thereby realizing the control of each winding unit by adopting a plurality of small-capacity motor driver units, through the ingenious structural design, the applicant finds that the problems of unreliable performance and high cost of a large-capacity driver are effectively solved, and importantly, the winding of a plurality of sets of functional windings in the same stator slot is not required to be adopted as proposed by CN102497055A, but by adopting a plurality of winding units on different stator teeth, the winding process is simple, the requirement standard of the insulation performance of the stator is not increased, the arrangement number of the winding units can not be limited by the size of the stator slot, and the motor is particularly suitable for being applied to the field of motor driving with high power requirement, such as being particularly suitable for being applied to the field of typical electric vehicles; meanwhile, as the structural design of the plurality of winding units is adopted, in the actual working process, when a certain winding unit or a motor driver thereof breaks down, other winding units can still work normally, and the direct drive failure of the motor cannot be caused, so that the structural design of the motor can effectively improve the fault tolerance rate of the motor;

2. on the basis of the above point 1, the present invention further proposes to adopt a design with a phase difference for each winding unit of the three-phase ac motor, and particularly preferably, the phase difference range of each phase winding corresponding to each winding unit may be set to be greater than 0 and less than or equal to 60 °; through the motor phase structure design of the plurality of winding units with different phase differences, through the detection and verification of back electromotive force of each winding unit, the low-order harmonic of the motor can be reduced by adopting the design with the phase differences of each winding unit, so that the stability of the motor torque can be ensured, and finally the performance and the operating efficiency of the motor can be effectively improved;

3. on the basis of the points 1 and 2, the invention further provides that the three-phase alternating current motor is applied to a medium-high power device with input power not less than 1KW, particularly an electric vehicle or an elevator, so that the medium-high power device can realize the structural arrangement of a small-capacity motor driver, various technical problems existing in the adoption of a single large-capacity motor driver are avoided, and meanwhile, the invention also ensures that the devices realize higher power on the premise of ensuring the reliability and have technical feasibility;

4. the invention also creatively provides a motor driving system structure design adopting the controller group for the first time, the controller group carries out centralized coordination management control on the operation states of all the motor driver units, and after the centralized coordination management control carries out communication summarization on the operation states of all the motor driver units, the controller group determines and executes a control instruction according to the summarized information of the operation states, so as to meet the control requirement of the motor driving system;

4.1 particularly preferably, when the motor adopts 2-3 winding units with a small quantity, the two-way data communication connection between the different motor driver units can be adopted to realize the communication sharing and summarization, and then the control instruction is determined and executed according to the running state summarization information, so as to meet the control requirement of the motor driving system;

4.2 particularly preferably, when the motor adopts 3 or more than 3 winding units, the controller group performs centralized coordination management control on a plurality of motor driver units (each motor driver unit is equivalent to a motor driving system in the prior art) by arranging the master controller, and particularly, data transmission such as a control instruction and the operation state of each motor driver unit can be realized through bidirectional data communication connection between the master controller and each motor driver unit, so that centralized management on the plurality of motor driver units can be well realized, the control structure is simple, effective and reliable, certainly, the technical scheme of the master controller is also suitable for the motor adopting 2 winding units, and particularly, specific selection can be made according to actual needs;

4.3 preferably, during implementation, the controller group can intelligently identify various abnormal operation conditions including that the operating state difference of each motor driver unit exceeds a preset value, and/or a certain motor driver unit fails and/or a certain winding unit fails through centralized coordination management control, and adopt a corresponding control instruction according to the abnormal operation conditions to finally ensure the normal operation of the motor driving system;

5. the present invention further preferably provides, on the basis of the above point 4, a control method adopted when various abnormal operating conditions occur, wherein the control method comprises: when the Hall element of the controller or the winding unit has a fault, other controllers can be instructed to independently drive or send Hall signals of other winding units to be shared to the fault winding unit so as to ensure the normal driving operation of the motor; when the running states of the motor driver units are inconsistent, the performance of a motor driving system is influenced, and when the motor driver units are applied to power driving in the field of electric vehicles, unified charging management is difficult to perform and normal motor starting is difficult to realize once the battery voltages are inconsistent, so that the controller group can avoid the situation that the battery voltages of the motor driver units are inconsistent once in a mode of presetting a battery voltage difference limit value when the motor runs; therefore, the technical scheme of carrying out coordinated management control on the plurality of controllers can improve the fault tolerance rate of the motor driving system, effectively ensure the normal operation of the motor driving system, further effectively ensure the use performance of a user finally, realize good unified battery charging management and avoid causing any difficulty to later maintenance and management;

6. on the basis of the points 3, 4 and 5, the invention further provides the application of the motor driving system in the field of electric vehicles as a motor driving system for electric vehicles, which effectively improves the technical bottlenecks of low reliability and high cost of the existing electric vehicles in the medium and high power market, can effectively promote the future electric vehicle market development process of realizing higher power and high performance on the premise of low and medium cost, and leads the industrialization process of the electric vehicle with higher power and high performance to come ahead, so that the electric vehicle provides better experience and greater convenience for users.

Drawings

Fig. 1 is a schematic structural diagram of a permanent magnet synchronous hub motor 100 according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the stator 20 and the permanent magnet outer rotor 40 according to the embodiment of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

fig. 4 is a structural distribution diagram of a stator winding unit of embodiment 1 of the invention;

FIG. 5 is a structural diagram of stator winding units according to comparative examples 1, 2 and 3 of the present invention;

fig. 6 is a structural distribution diagram of a stator winding unit of embodiment 3 of the invention;

fig. 7 is a structural distribution diagram of a stator winding unit of embodiment 4 of the invention;

fig. 8 is a structural distribution diagram of a stator winding unit of embodiment 7 of the invention;

fig. 9 is a structural distribution diagram of a stator winding unit of embodiment 8 of the invention;

fig. 10 is a structural distribution diagram of a stator winding unit of embodiment 9 of the invention;

FIG. 11 is a structural distribution diagram of a stator winding unit of comparative example 4 of the present invention;

fig. 12 is a structural distribution diagram of a stator winding unit according to embodiment 10 of the present invention;

FIG. 13 is a structural distribution diagram of a stator winding unit of comparative example 5 of the present invention;

fig. 14 is a schematic block configuration diagram of a motor drive system of embodiment 1 of the invention;

FIG. 15 is a schematic block diagram of the controller cluster of FIG. 14;

fig. 16 is a schematic block configuration diagram of a controller group according to embodiment 13 of the present invention;

fig. 17 is a structural distribution diagram of a stator winding unit of embodiment 11 of the invention;

FIG. 18 is a structural distribution diagram of a stator winding unit of comparative example 6 of the present invention;

fig. 19 is a graph of back electromotive force of a stator winding unit according to embodiment 1 of the present invention;

fig. 20 is a graph of back electromotive force of a stator winding unit according to embodiment 14 of the present invention.

Detailed Description

The embodiment of the invention discloses a three-phase alternating current motor, wherein a stator of the three-phase alternating current motor is provided with stator slots of 3 multiplied by n, and n is a positive integer which is more than 0 and is not 1; the stator slot is formed by every two adjacent stator teeth; the stator comprises 2 or more than 2 winding units, and each winding unit is wound on different stator teeth respectively; each winding unit is electrically connected with the corresponding motor driver unit, and each motor driver unit is used for controlling the operation of the winding unit electrically connected with the corresponding winding unit.

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

embodiment 1 provides an electric vehicle, which includes an electric vehicle mounting frame body and a motor driving system integrally mounted and connected, specifically, in this embodiment, the electric vehicle is an electric motorcycle, and its input power range is 400W-10KW, more preferably, its input power range is 1KW-10KW, within this range of a medium-high power electric vehicle, the technical effect of the present invention will be further enhanced;

referring to fig. 14, the motor driving system in this embodiment includes a three-phase ac motor and a controller group for controlling the three-phase ac motor, and particularly preferably, in this embodiment 1, the three-phase ac motor is a permanent magnet motor, and more specifically, in this embodiment, a permanent magnet synchronous hub motor is used;

referring to fig. 1, a permanent magnet synchronous hub motor 100 includes a stator 20 integrally connected to a motor shaft 10, a permanent magnet outer rotor 40 integrally connected to an electric vehicle hub 30, magnetically coupled to the stator 20, and coaxially outputting, a front end cover 50 and a rear end cover 60 relatively rotatably mounted at two ends of the motor shaft through mounting bearings, and a hall element for electrically connecting to a controller of an electric vehicle, further referring to fig. 2 and 3, the stator 20 includes a stator core 21 formed by laminating a plurality of stator laminations, the stator core 21 has stator slots of a multiple of 3 × n, n is a positive integer greater than 0 and not 1; the permanent magnetic outer rotor 40 comprises a yoke ring 41 and a plurality of permanent magnetic steels 42 which are arranged on the inner side surface of the yoke ring 41 at fixed intervals; the stator core 21 is fixedly connected with the motor shaft 10 through a stator frame 23; the front end cover 50 and the rear end cover 60 are respectively fixed on the yoke ring through screws, and the yoke ring 41 is connected with the electric vehicle hub 30 into a whole;

preferably, in the present embodiment, the outer diameter of the stator core ranges from 105 to 300 mm; more preferably, in order to adapt to the general specification size of the electric vehicle on the current market, further preferably, the outer diameter range of the stator core is 105-; particularly preferably, in the present embodiment, the material of the permanent magnet steel 42 is neodymium iron boron; the outer diameter range of the stator core 21 is 190-220 mm;

preferably, in the present embodiment, the number of stator slots is 36 slots or 45 slots or 48 slots or 51 slots or 54 slots or 57 slots or 63 slots or 72 slots; the number of the permanent magnetic steel 42 is 40-80; specifically, preferably, in the present embodiment, the outer diameter of the stator core 21 is 205.3 mm; the number of the stator slots 22 is 54, and specifically, the stator slots 22 are formed by every two adjacent stator teeth 24; the inner diameter of the yoke ring 41 is 210 mm; the number of the permanent magnet steel 42 is 60, namely a 60-pole magnetic pole structure;

it should be noted that, in other embodiments of the present invention, the selection of parameters such as the outer diameter of the stator core 21, the number of the stator slots 22, and the number of the permanent magnet steels 42 may be set according to the specifications of the electric motorcycle in the prior art, which are not the technical content to be improved by the present invention, so that those skilled in the art can select the specifications of the specific electric motorcycle in the above preferred range according to the actual requirements of the existing market, and these motors with different specifications can implement the technical solution of the present invention, and the present invention is not limited thereto.

Specifically, in the present embodiment, referring to fig. 4, the stator 20 employs 2 winding units, which are a first winding unit including three-phase lines a1, B1, and C1 and a second winding unit including three-phase lines a2, B2, and C2, and the first winding unit and the second winding unit are respectively wound on different stator teeth 24, and they can make the permanent magnet synchronous hub motor 100 work independently;

preferably, in the present embodiment, the phase differences of the three-phase lines a1, B1, C1 of the first winding unit and the three-phase lines a2, B2, C2 of the corresponding second winding unit are all equal to 0;

particularly preferably, in the present embodiment, the first winding unit and the second winding unit both adopt a star connection method, and the input current and the magnetic flux are equal;

in the winding structure arrangement of the present invention, specifically, in the present embodiment, each phase winding coil of each winding unit is wound on 3 stator teeth 24 as a group, and in other embodiments, the structure arrangement of the winding coil can be selected according to the required motor parameters, which are all selected by common knowledge and conventional techniques of those skilled in the art;

since the winding units of the present invention are respectively wound on different stator teeth 24, the total number of slots of each winding unit becomes small, and if a single winding unit is adopted, the number of turns of the winding unit will cause the magnetic flux of the motor to be smaller than that of the motor adopting the single winding unit, thereby causing the rotation speed of the motor to become small, therefore, preferably, in the present embodiment, the number of turns of the first winding unit and the second winding unit is increased to maintain the magnetic flux of the motor adopting the single winding unit, so as to finally ensure that the present embodiment will not cause the reduction of the rotation speed of the motor due to the increase of the number of winding units, specifically, the formula calculation method for increasing the number of turns is: the number of turns of the first winding unit and the second winding unit is equal to the number of turns x of the winding unit of the motor (specifically, in the embodiment 1, the number of winding units is 2);

preferably, in the present embodiment, the output power of the permanent magnet synchronous hub motor 100 is equal to the input power of the electric motorcycle, i.e. 1KW to 10KW, the rotating speed range of the permanent magnet synchronous hub motor 100 during normal operation is 500-; the actual parameter selection can be specifically set according to the actual application requirements, and the embodiments of the specific settings can effectively solve the technical problems to be solved by the invention; specifically, in the present embodiment, the output power of the permanent magnet synchronous hub motor 100 is 8KW, the rotation speed range during normal operation is 600-;

as further shown in fig. 15, the controller group includes a first motor driver unit and a second motor driver unit electrically connected to the first winding unit and the second winding unit respectively, preferably, in this embodiment, the first motor driver unit includes a first battery and a first controller electrically connected (shown as ACC positive pole and GND negative pole in fig. 14), the second motor driver unit includes a second battery and a second controller electrically connected (shown as ACC positive pole and GND negative pole in fig. 14), wherein the first controller output terminal and the second controller output terminal are respectively connected to the first winding unit and the second winding unit corresponding thereto; the first controller and the second controller are respectively used for controlling the operation of the corresponding first winding unit and the second winding unit, specifically, the three-phase lines A1, B1 and C1 of the first winding unit are connected to the first controller by the first winding unit, and meanwhile, the first controller is connected with the first winding unit in a control mode through the first Hall element; the three-phase lines A2, B2 and C2 of the second winding unit are connected to a second controller by the second winding unit, and meanwhile, the second controller is connected with the second winding unit in a control mode through a second Hall element; the control method of the motor driving system comprises the following steps: the controller group performs centralized coordination management control on the operation states of the first controller and the second controller, and after the centralized coordination management control performs communication summarization on the operation states of the first controller and the second controller, the controller group determines and executes a control instruction according to the summarized operation state information, so as to meet the control requirement of the motor driving system.

Preferably, in this embodiment, the centralized coordination management control may intelligently recognize the operation abnormality of the first controller and the second controller, and take a corresponding control instruction according to the operation abnormality, so as to ensure that the motor driving system operates normally.

Preferably, in this embodiment, the controller group further includes a master controller connected to the first controller and the second controller, respectively, and the master controller is configured to perform centralized coordination management control on the operating states of the first controller and the second controller; preferably, the main controller and the first controller and the second controller respectively perform bidirectional data communication connection, where the bidirectional data communication connection includes a sending data communication connection TX and a receiving data communication connection RX, and the specific communication connection may be a wired communication manner such as uart or can, or a wireless communication manner such as bluetooth, GPRS, and WI F I, or of course, other communication connection manners known to those skilled in the art may also be used; specifically, preferably, in this embodiment, the operation states of the first controller and the second controller respectively refer to operation data of the operation states of the first controller and the second controller, and specifically include data information such as battery voltage, motor speed, and fault, and may further include data information such as output current and output power, which may be specifically selected according to the needs of control instructions adopted in actual application, and these are all conventional technical choices that can be made based on the present invention, and the present embodiment is not described one by one.

It should be noted that in all embodiments of the present invention, the related controller and the master controller generally include an MCU main module, a communication module and various peripheral function hardware circuits configured according to specific application requirements, preferably, when the present invention is implemented, the controller may also directly refer to the central control and electric control device and the related function hardware circuit modules disclosed in the prior application CN201510224976.1 of the present applicant, which may effectively simplify the wiring harness arrangement of the electric vehicle, and these are common knowledge in the control field, and are not specifically explained any more;

specifically, preferably, referring to fig. 15, in this embodiment, the master controller includes a master control MCU main module and a master control communication module connected to the master control MCU main module; the first controller comprises a first MCU main module and a first communication module for communication data connection, and the second controller comprises a second MCU main module and a second communication module for communication data connection, wherein the first communication module and the second communication module are respectively in bidirectional data communication connection with the master control communication module; other specific functional modules of the first controller and the second controller can be directly referred to in the technical content disclosed in CN201510224976.1, and can also adopt a motor controller structure in the prior art, which are not innovative contents of the present invention, and therefore, the description is not repeated.

Further preferably, in this embodiment, the master control communication module of the master controller is further connected to an external display device, and is configured to display the operating states of the first controller and the second controller, where the external display device may specifically be a device such as an instrument, a lamp, and a display screen, and the communication mode may also adopt a wired communication mode such as uart or can, and may also adopt a wireless communication mode such as bluetooth, GPRS, and WIF I; for using the reference to an external user;

specifically, the control method of the motor drive system according to the present embodiment includes the steps of:

s10), the first controller and the second controller send respective running states to the master controller;

s20), the master controller receives the running state information of the first controller and the second controller, intelligently recognizes the running abnormal condition, takes the corresponding control instruction according to the running abnormal condition, and sends the control instruction to the corresponding first controller or second controller;

s30), the first controller or the second controller which receives the control instruction controls the operation of the corresponding first winding unit or the second winding unit according to the control instruction, and the first controller or the second controller is used for ensuring the normal operation of the motor driving system.

Specifically, in this embodiment, the operation abnormality includes operation conditions such as a difference between battery voltage data of each motor driver unit exceeding a preset value, a failure of a certain motor driver unit, and damage of a hall element of a certain winding unit;

further specifically, in this embodiment, when the overall controller intelligently recognizes that the second battery voltage data is smaller than the first battery voltage data, and the difference exceeds 3V (the preset value of this embodiment is set to 3V, and in other embodiments, a person skilled in the art may specifically limit the difference as needed), the control instruction taken by the overall controller is as follows: reducing the output power of the second controller until the data difference between the first battery voltage and the second battery voltage does not exceed a preset value of 3V; in other embodiments, the output power of the first controller may be increased to achieve a preset value that the data difference between the first battery voltage and the second battery voltage does not exceed 3V, which also belongs to the conventional technical choice that can be made by those skilled in the art based on the present invention; in this embodiment, the control target for which the battery voltage data difference of each motor driver unit does not exceed the preset value may be used to ensure the uniform charging management of each motor driver unit, in addition to ensuring the normal operation of the motor driving system;

further specifically, when the master controller intelligently recognizes that the second controller fails, the control instruction taken by the master controller is as follows: the master controller sends the fault information to the first controller, instructs the first controller to independently drive the motor, and selectively reduces the output rotating speed according to the riding state of the client to ensure the normal operation of the motor driving system;

preferably, in the embodiment of the present invention, while the step S20) or the step S30) is performed, the general controller sends the received operation state information of the first controller and the second controller to the external display device for using a reference for an external user, and the user obtains an external operation to be performed according to the displayed operation state, specifically, when the second controller is displayed to be faulty, the user can know that a nearby maintenance point can be searched for in a suitable time for precise maintenance and replacement, and before the user performs maintenance and replacement, riding of the electric motorcycle by the user is not affected;

further specifically, when the master controller intelligently identifies that the hall element of the first winding unit is damaged, the control instruction taken by the master controller is as follows: the main controller sends the Hall signal of the second winding unit to the first controller, and the first controller instructs the first winding unit to normally operate according to the Hall signal;

in other embodiments of the present invention, other types of operation abnormalities such as a failure from one or several motor driver units, a failure from one or several winding units, or other operation state differences of each motor driver unit exceeding a preset value (such as output current or output power, etc.) can be identified by the master controller, and by selectively taking control instructions for these specific operation abnormalities, it is ensured that the motor driving system can still normally operate when a failure occurs, a high fault tolerance is achieved, or timely control adjustment is performed when an operation abnormality occurs, thereby avoiding increasing difficulty in later maintenance management, these operation abnormalities which need to be intelligently identified and the control instructions correspondingly taken can be specifically selected according to actual control requirements, which can be reasonably expected by a person skilled in the art on the basis of the present invention providing the master controller, all falling within the scope of the claims of the present invention.

Comparative example 1: the remaining technical solution of the comparative example 1 is the same as that of the example 1, except that: referring to fig. 5, in the present comparative example 1, the stator employs a single winding unit electrically connected to a single motor driver.

On the basis of realizing the same motor performance, the input current of each winding unit in the controller group of the embodiment 1 is 40A, and the input current of a single winding unit in the comparative example 1 is 80A, that is, the capacity of the motor driver adopted in the embodiment 1 is 1/2 of the capacity of the motor driver adopted in the comparative example 1, so that the problems of unreliable performance and high cost existing in the adoption of a single large-capacity driver are effectively solved.

Example 2: the remaining technical solutions of this embodiment 2 are different from those of embodiment 1 in that: in the embodiment 2, the electric vehicle is an electric two-wheeled vehicle; wherein the output power range of the permanent magnet synchronous hub motor is 180W-1.5KW, the rotating speed range during normal work is 500-1000 rpm, and the input current range of each winding unit is 1-100A; the specific size specification, the number of stator slots and the number of permanent magnet steel sheets of the permanent magnet synchronous hub motor can be specifically selected according to the functional parameters of the permanent magnet synchronous hub motor required by the embodiment 2, and the permanent magnet synchronous hub motor for the electric two-wheeled vehicle in the prior art can be specifically selected;

although the capacity of the motor driver can be reduced in the embodiment 2, the input power of the electric two-wheeled vehicle which is mainstream in the market at present is usually between 180W and 500W, so the implementation effect of the embodiment 2 is not as good as the technical effect of the electric two-wheeled vehicle which is applied to the medium and high power electric vehicle with the input power of more than 1KW, but the technical scheme of the invention can be applied to the electric two-wheeled vehicle, does not have any technical limitation, and can be completely applied to the embodiment 2 along with the development requirement of the high power of the electric two-wheeled vehicle.

Example 3: the rest of the technical solutions of this embodiment 3 are the same as those of embodiment 1, except that: in this embodiment 3, the electric vehicle is an electric tricycle; the output power range of the permanent magnet synchronous hub motor is 250W-15KW, more preferably 1KW-15KW, the rotating speed range in normal work is 500-2000 rpm, and the input current range of each winding unit is 10-200A; specifically, in this embodiment, the output power of the permanent magnet synchronous hub motor 100 is 10KW, the rotation speed range during normal operation is 800-;

referring to fig. 6, in embodiment 3, the stator 20 adopts 3 winding units, which are a first winding unit including three-phase lines a1, B1 and C1, a second winding unit including three-phase lines a2, B2 and C2, and a third winding unit including three-phase lines A3, B3 and C3, and the first winding unit, the second winding unit and the third winding unit are respectively wound on different stator teeth; particularly preferably, in the present embodiment, the first to sixth winding units all adopt a star connection method, and the input current and the magnetic flux are equal; the controller group comprises a first motor driver unit, a second motor driver unit and a third motor driver unit which are respectively and correspondingly and electrically connected with the first winding unit, the second winding unit and the third winding unit, and the third motor driver unit comprises a third battery and a third controller which are electrically connected; the controller group also comprises a master controller which is respectively connected with the first controller, the second controller and the third controller, and the master controller is used for controlling the running states of the first controller, the second controller and the third controller;

specifically, preferably, in this embodiment, when the general controller intelligently identifies an abnormal operation, when the general controller intelligently identifies that the first battery voltage data is smaller than the average battery voltage of the first, second, and third battery voltages, and the difference exceeds 3V, the output power of the first controller is reduced until the data difference between the three battery voltages does not exceed a preset value of 3V; for example, when the master controller intelligently recognizes that the third controller has a fault, the fault information can be sent to the first controller and the second controller, the first controller and the second controller are instructed to independently drive the motor, and the output rotating speed is selectively reduced according to the riding state of a client; for example, when the overall controller intelligently identifies that the hall element of the second winding unit is damaged, the control instruction taken by the overall controller is as follows: the main controller sends the hall signal of the second winding unit to the first controller, and the first controller instructs the first winding unit to normally operate according to the hall signal; the sending sequence of the specific controller is preset by the master controller.

Comparative example 2: the remaining technical solution of the comparative example 2 is the same as that of the example 1, except that: referring to fig. 5 in combination, in the present comparative example 2, the stator employs a single winding unit, which is electrically connected to a single motor driver.

On the basis of realizing the same motor performance, the input current of each winding unit in the controller group of this embodiment 3 is 30A, and the input current of a single winding unit in comparative example 2 is 90A, that is, the capacity of the motor driver adopted in this embodiment 1 is 1/3 of the capacity of the motor driver adopted in comparative example 1, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in the adoption of a single large-capacity driver.

Example 4: the rest of the technical solutions of this embodiment 4 are the same as those of embodiment 1, except that: in the present embodiment 4, the electric vehicle is an electric four-wheeled vehicle; the three-phase alternating current motor adopts a permanent magnet synchronous hub motor, wherein the output power range of the three-phase alternating current motor is 3KW-150KW, the rotating speed range during normal work is 500-2000 rpm, and the input current range of each winding unit is 20-1000A; specifically, in the present embodiment, the output power of the three-phase ac motor is 80KW, the rotation speed range during normal operation is 1200-; the specific size specification of the permanent magnet synchronous hub motor can be specifically selected according to the functional parameters of the permanent magnet synchronous hub motor required in the embodiment 4, and specifically, the permanent magnet synchronous hub motor for the electric four-wheel vehicle in the prior art can be selected;

referring to fig. 7, in embodiment 4, the stator employs 6 winding units, which are a first winding unit including three-phase lines a1, B1, and C1, a second winding unit including three-phase lines a2, B2, and C2, a third winding unit including three-phase lines A3, B3, and C3, a fourth winding unit including three-phase lines a4, B4, and C4, a fifth winding unit including three-phase lines a5, B5, and C5, and a sixth winding unit including three-phase lines a6, B6, and C6, and the first winding unit, the second winding unit, the third winding unit, the fourth winding unit, the fifth winding unit, and the sixth winding unit are respectively wound on different stator teeth; particularly preferably, in the present embodiment, the first to sixth winding units all adopt a star connection method, and the input current and the magnetic flux are equal;

the controller group comprises a first motor driver unit, a second motor driver unit, a third motor driver unit, a fourth motor driver unit, a fifth motor driver unit, a sixth motor driver unit and a controller, wherein the first motor driver unit, the second motor driver unit, the third motor driver unit, the fourth motor driver unit and the fourth motor driver unit are respectively and correspondingly electrically connected with the first winding unit, the second winding unit, the third winding unit and the; the controller group also comprises a master controller which is respectively connected with the controllers of the first motor driver unit to the sixth motor driver unit, and the master controller is used for controlling the running states of the controllers of the first motor driver unit to the sixth motor driver unit;

specifically, in this embodiment, reference may be made to the technical solution in embodiment 3 for intelligently identifying the operation abnormality and taking the control instruction by the master controller, and for saving the description, detailed description is not specifically provided in this embodiment 4.

Comparative example 3: the remaining technical solution of the present comparative example 3 is the same as that of the embodiment 1, except that: referring to fig. 5 in combination, in the present comparative example 3, the stator employs a single winding unit, which is electrically connected to a single motor driver.

On the basis of realizing the same motor performance, the input current of each winding unit in the controller group of this embodiment 4 is 30A, and the input current of a single winding unit in comparative example 3 is 180A, that is, the capacity of the motor driver adopted in this embodiment 1 is 1/6 of the capacity of the motor driver adopted in comparative example 1, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in the adoption of a single large-capacity driver.

Example 5: embodiment 5 proposes a medium-high power device with input power not less than 1KW, and more preferably, embodiment 5 proposes a medium-high power device with input power not less than 2KW, and the rest of the technical solutions of the motor driving system applied to the medium-high power device are the same as embodiment 3, except that: the medium and high power device is an elevator; the three-phase alternating current motor is a permanent magnet motor, wherein the input power range of the elevator is 3KW-50 KW; particularly preferably, in the embodiment 5, the input power range of the elevator is 10 KW; specifically, the specific size specification, the number of stator slots, and the number of permanent magnet steel sheets of the permanent magnet motor may be specifically selected according to the above functional parameters of the permanent magnet motor required in this embodiment 5, and specifically, the permanent magnet motor for an elevator in the prior art may be selected;

compared with the conventional permanent magnet motor in the field of high-power household appliances or electric tools in the prior art, in this embodiment 5, the capacity of the motor driver adopted in this embodiment 5 is 1/3 of the capacity of the motor driver adopted in the prior art, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in the case of adopting a single high-capacity driver.

Example 6: this embodiment 6 proposes a medium-high power device with input power not less than 1KW, and more preferably, this embodiment 6 proposes a medium-high power device with input power not less than 2KW, and the rest of the technical solution of the motor driving system applied to the medium-high power device is the same as that of embodiment 4, except that: the medium and high power device is an elevator; the three-phase alternating current motor is a permanent magnet motor, and the input power range of the elevator is 30 KW; specifically, the specific size specification, the number of stator slots, and the number of permanent magnet steel sheets of the permanent magnet motor may be specifically selected according to the above functional parameters of the permanent magnet motor required in this embodiment 6, and specifically, the permanent magnet motor for an elevator in the prior art may be selected;

compared with the permanent magnet motor in the prior art in the field of the existing medium-high power device, in this embodiment 6, the capacity of the motor driver adopted in this embodiment 6 is 1/6 of the capacity of the motor driver adopted in the permanent magnet motor in the prior art, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in the adoption of a single large-capacity driver.

It should be noted that, those skilled in the art can apply the three-phase ac motor or the motor driving system of the present invention to other types of medium and high power devices according to actual needs, and the present invention is not limited to the application field.

Example 7: the rest of the technical solutions of this embodiment 7 are the same as those of embodiment 1, except that: referring to fig. 8, in this embodiment 7, the first winding unit and the second winding unit are connected in a delta connection manner; in particular, in the implementation, the connection method of each winding unit can be selected according to actual needs, the invention is not particularly limited, and the star connection method belongs to a more preferable technical scheme from the viewpoint of facilitating practical application.

Example 8: the rest of the technical solutions of this embodiment 8 are the same as those of embodiment 1, except that: referring to fig. 9, in the present embodiment 8, the first winding unit and the second winding unit are wound on the same stator teeth in parallel.

In this embodiment 8, because 2 sets of winding units are wound on the same stator tooth, compared with embodiment 1, the winding manufacturing process is more complicated, and the requirement for the insulation performance of the stator increases, the possibility of insulation failure increases, and when more than 2 sets of winding units are wound, the technical problem becomes more serious, and therefore, the applicable range is also greatly limited.

Since this embodiment 8 uses parallel winding on the same stator teeth, the motor applied in this embodiment is not limited by the number of stator slots of 3 × n times as described in embodiment 1.

Example 9: the rest of the technical solutions of this embodiment 9 are the same as those of embodiment 1, except that: referring to fig. 10, in the present embodiment 9, the number of the stator slots is 48; the number of the permanent magnet steel is 52, namely a 52-pole magnetic pole structure; each phase of winding coil of each winding unit is wound on 4 stator teeth to form a group; in this embodiment 9, the size specification of the permanent magnet synchronous hub motor can be specifically selected according to the actual design requirement of the motor;

comparative example 4: the remaining technical solution of the present comparative example 4 is the same as that of example 9, except that: referring to fig. 11, in the present comparative example 4, the stator employs a single winding unit, which is electrically connected to a single motor driver.

On the basis of realizing the same motor performance, the input current of each winding unit in the controller group of this embodiment 9 is 40A, and the input current of a single winding unit in comparative example 4 is 80A, that is, the capacity of the motor driver adopted in this embodiment 9 is 1/2 of the capacity of the motor driver adopted in comparative example 4, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in the adoption of a single large-capacity driver.

Example 10: the rest of the technical solutions of this embodiment 10 are the same as those of embodiment 1, except that: referring to fig. 12, in the present embodiment 10, the number of the stator slots is 12; the number of the permanent magnet steel is 10, namely the permanent magnet steel is a 10-pole magnetic pole structure; each phase of winding coil of each winding unit is wound on 2 stator teeth to form a group; in this embodiment 10, the size specification of the permanent magnet synchronous hub motor can be specifically selected according to the actual design requirement of the motor;

comparative example 5: the remaining technical solution of the present comparative example 5 is the same as that of the example 10, except that: referring to fig. 13, in the present comparative example 5, the stator employs a single winding unit, which is electrically connected to a single motor driver.

On the basis of realizing the same motor performance, the input current of each winding unit in the controller group of this embodiment 10 is 40A, and the input current of a single winding unit in comparative example 5 is 80A, that is, the capacity of the motor driver adopted in this embodiment 10 is 1/2 of the capacity of the motor driver adopted in comparative example 5, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in the adoption of a single large-capacity driver.

Example 11: the rest of the technical solutions of this embodiment 11 are the same as those of embodiment 1, except that: referring to fig. 17, in the present embodiment 11, the number of the stator slots is 9; the number of the permanent magnet steel is 10, namely the permanent magnet steel is a 10-pole magnetic pole structure; the stator 20 adopts 3 winding units, which are respectively a first winding unit comprising three-phase lines A1, B1 and C1, a second winding unit comprising three-phase lines A2, B2 and C2 and a third winding unit comprising three-phase lines A3, B3 and C3, wherein the first winding unit, the second winding unit and the third winding unit are respectively wound on different stator teeth; each phase of winding coil of each winding unit is wound on a single stator tooth to form a group; in this embodiment 11, the size specification of the permanent magnet synchronous hub motor can be specifically selected according to the actual design requirement of the motor;

preferably, the phase difference between the three-phase line of the first winding unit and the three-phase line of the corresponding second winding unit and the three-phase line of the corresponding third winding unit is greater than 0 and less than or equal to 60 °; specifically, preferably, the phase difference between the three-phase line of the first winding unit and the three-phase line of the corresponding second winding unit is 30 °, and the phase difference between the three-phase line of the third winding unit and the three-phase line of the corresponding second winding unit is 30 °, in other embodiments of the present invention, winding units with other phase differences may also be adopted, and may be specifically set according to actual application needs;

comparative example 6: the remaining technical solution of the present comparative example 6 is the same as that of the example 11, except that: referring to fig. 18, in the present comparative example 6, the stator employs a single winding unit, which is electrically connected to a single motor driver.

On the basis of realizing the same motor performance, the input current of each winding unit in the controller group of this embodiment 11 is 40A, and the input current of a single winding unit in comparative example 6 is 80A, that is, the capacity of the motor driver adopted in this embodiment 10 is 1/3 of the capacity of the motor driver adopted in comparative example 5, which effectively solves the problems of unreliable performance, high cost and poor fault tolerance existing in adopting a single large-capacity driver; while the torque stability of this example 11 is better than that of example 1.

Example 12: the rest of the technical solutions of this embodiment 12 are the same as those of embodiment 4, except that: in this embodiment 12, the three-phase ac motor is an electrically excited motor, specifically, in this embodiment, the excitation method of the electrically excited motor is the excitation method of other excitation, and in this embodiment, during the rotation of the three-phase ac motor, the other excitation can control the voltage of the stator to change the magnetic field generated by the stator.

Example 13: the rest of the technical solutions of this embodiment 13 are the same as those of embodiment 1, except that: in this embodiment 13, the controller group does not include a master controller, and specifically adopts the following technical solution to perform centralized coordination management control:

as further shown in fig. 16, a bidirectional data communication connection is directly performed between a first communication module of the first controller and a second communication module of the second controller, wherein the bidirectional data communication connection includes a transmission data communication connection TX and a reception data communication connection RX; in this embodiment, the operation step of centralized coordination management control includes:

s10'), the first controller or the second controller respectively transmitting the respective operation states to the other controller;

s20'), the controller intelligently recognizes the abnormal operation condition after receiving the operation state information of the other controller, takes the corresponding control instruction according to the abnormal operation condition and sends the control instruction to the controller or the corresponding controller;

s30'), controlling the operation of the corresponding winding unit by the controller receiving the control instruction according to the control instruction, and ensuring the normal operation of the motor driving system;

while the above step S20 ') or step S30') is performed, the second communication module of the second controller sends the received operation status information of the first controller and the second controller to the external display device for the reference of the external user, wherein the present embodiment 13 takes the corresponding control instruction according to the abnormal operation condition as the control instruction described in embodiment 1.

Example 14: the rest of the technical solutions of this embodiment 14 are the same as those of embodiment 1, except that: in this embodiment 14, the phase differences of the three-phase lines a1, B1, C1 of the first winding unit and the three-phase lines a2, B2, C2 of the corresponding second winding unit are not equal to 0, and particularly preferably, in this embodiment, the phase differences of the three-phase lines a1, B1, C1 of the first winding unit and the three-phase lines a2, B2, C2 of the corresponding second winding unit are 60 °;

referring to fig. 19 and 20, respectively, back electromotive force graphs of stator winding units of example 1 and example 14 are shown, in the back electromotive force graphs, the abscissa is an electrical angle, and the ordinate is a value of back electromotive force of a corresponding phase line, and the unit is volt, wherein, since phase differences of three phase lines of a first winding unit and a second winding unit of example 1 are both 0 (i.e. there is no phase difference), back electromotive force V of the three phase lines is detected_A1、V_B1、V_C1Is lower than the back electromotive force V of the three-phase line of example 14_A1、V_B1、V_C1、V_A2、V_B2、V_C2The harmonic frequency of the back electromotive force of the stator winding unit can directly reflect the stability of the motor torque, and the harmonic frequency of the embodiment 14 is increased (namely, the low harmonic of the motor is reduced), so that the stability of the motor torque of the embodiment 14 is improved, and finally, the performance and the operating efficiency of the motor are effectively improved.

Example 15: the rest of the technical solutions of this embodiment 15 are the same as those of embodiment 4, except that: in this embodiment 15, the phase differences of the three-phase lines corresponding to the 6 winding units are not equal to 0, specifically, the phase differences of the three-phase lines a1, B1, and C1 of the first winding unit and the three-phase lines of the second winding units a2, B2, and C2 are 10 °, and the phase differences of the three-phase lines of the third to sixth winding units are increased by 10 ° on the basis of 10 °;

the same principle as that described in embodiment 14, but because the harmonic order of the counter electromotive force of the three phase line of this embodiment 15 is lower than that of embodiment 14, the torque stability of the motor of embodiment 15 is better than that of embodiment 14.

Example 16: the rest of the technical solutions of this embodiment 16 are the same as those of embodiment 1, except that: in embodiment 16, the first winding element and the second winding element are not equal in magnetic flux; the first winding unit is used for driving and running the motor, the second winding unit is used for generating and storing energy when the motor is braked, namely the first winding unit is used for the function of the motor, and the second winding unit is used for assisting the function of the generator.

The purpose of this embodiment 16 is to realize different functional states of the motor by designing different winding units of the motor, so as to realize the multifunctional application of the present invention in implementation, and the application performed on this basis also belongs to the protection scope of the present invention.

Comparative example 7: the remaining technical solution of the present comparative example 7 is the same as that of the embodiment 1, except that: in comparative example 7, no master controller was provided, and the operation states of the motor driver units were not centrally coordinated and managed.

In comparative example 7, since the first controller and the second controller are not subjected to centralized coordination management control, after a long time of trial operation, it is found that a large difference is generated between voltages of the first battery and the second battery, so that effective unified charging management of the first battery and the second battery is difficult to realize, and even a certain winding unit cannot be started; when a Hall element of a certain winding unit fails or a certain controller fails, the motor cannot run normally, the fault tolerance is poor, and the user experience is poor.

According to the technical scheme of the embodiment of the invention, the number of the winding units can be specifically selected by technicians in the field according to actual application requirements, as long as a single high-capacity driver adopted by the medium-power and high-power motors all the time can be controlled by a plurality of low-capacity motor driver units, the control performance is reliable, the cost is low, the technical bottlenecks of unreliable performance and low cost in the current medium-power and high-power electric driving market are effectively improved, the technical bottleneck of the medium-power and high-power electric driving market in the prior art is effectively solved, and especially the future electric vehicle market development process of realizing higher power and high performance on the premise of low cost can be obviously and effectively promoted; meanwhile, as the embodiment of the invention adopts the structural design of the plurality of winding units, in the actual working process, when a certain winding unit or a motor driver thereof breaks down, other winding units can still work normally, and the direct drive failure of the motor can not be caused, therefore, the structural design of the invention can effectively improve the fault tolerance rate of the motor.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A three-phase alternating current motor, characterized in that a stator of the three-phase alternating current motor has stator slots of a multiple of 3 x n, n being a positive integer greater than 0 and not 1; the stator slots are formed by every two adjacent stator teeth; wherein,

the stator comprises 2 or more than 2 winding units, and each winding unit is wound on different stator teeth;

each winding unit is electrically connected with the corresponding motor driver unit, and each motor driver unit is used for controlling the operation of the winding unit electrically connected with the corresponding winding unit.

2. The three-phase alternating current motor according to claim 1, wherein the three-phase alternating current motor is a permanent magnet motor or an electrically excited motor.

3. The three-phase alternating current motor of claim 1, wherein the stator includes at least a first winding unit and a second winding unit, wherein,

and the phase differences of the three-phase line of the first winding unit and the three-phase line of the second winding unit corresponding to the first winding unit are all equal to 0.

4. The three-phase alternating current motor of claim 1, wherein the stator includes at least a first winding unit and a second winding unit, wherein,

and the phase difference between the three-phase line of the first winding unit and the three-phase line of the second winding unit corresponding to the first winding unit is not equal to 0.

5. The three-phase ac motor according to claim 4, wherein a phase difference between a three-phase line of the first winding unit and a three-phase line of the second winding unit corresponding thereto is greater than 0 and less than or equal to 60 °.

6. The three-phase alternating current motor of claim 1, wherein each of said winding elements is star-connected or delta-connected.

7. The three-phase ac motor of claim 1, wherein the three-phase ac motor has an output power in a range of 120W to 150KW and an input current in a range of 1 to 1000A for each of said winding units.

8. The three-phase alternating current motor of claim 1, wherein the magnetic flux of each winding unit is equal.

9. A three-phase ac motor according to claim 8, wherein the three-phase ac motor is configured to maintain a magnetic flux when a single winding unit is used for the motor by increasing the number of turns of each winding unit, and the capacity of the motor driver unit is equal to the capacity of the motor driver used for the motor when a single winding unit is used/the number of winding units.

10. The three-phase alternating current motor of claim 1, wherein the stator comprises at least a first winding element and a second winding element, wherein the first winding element and the second winding element are not equal in magnetic flux.