CN114938087A - High-frequency transformer integrated double-module magnetic flux switching motor - Google Patents

Abstract

The invention relates to an integrated double-module flux switching motor of a high-frequency transformer, which comprises a stator module and a rotor module, wherein the stator module comprises a stator module, the stator module comprises a plurality of stator cores arranged around the stator module, a first armature winding, a second armature winding and a third armature winding which are wound on the stator cores, and a plurality of permanent magnets arranged between the stator cores, the rotor module comprises a rotating shaft and two groups of rotor modules arranged along the axial direction of the rotating shaft, the rotor module comprises a plurality of rotor teeth, and an included angle is formed between the rotor teeth on the two rotor modules along the circumferential direction. This patent reconstructs the motor structure into the transformer, makes electric automobile actuating system and charging system high-integrated in the car finite space, simplifies on-vehicle charging system, realizes the high integration of battery charging outfit.

Description

A high-frequency transformer integrated dual-module flux switching motor

technical field

The invention relates to the technical field of motor manufacturing, in particular to a high-frequency transformer integrated dual-module magnetic flux switching motor.

Background technique

Since the beginning of the 21st century, the energy crisis and environmental problems have become increasingly prominent. Experts and scholars have paid great attention to the research and development of new energy electric vehicles, which has made the electric vehicle industry develop rapidly around the world. However, limited by battery technology, consumers have concerns about the battery life of electric vehicles, which has also become the main bottleneck of electric vehicles. Therefore, it is of great significance to develop a highly integrated charging system for electric vehicles that is convenient, fast, effective and low-cost.

For safety reasons, a motor with electrical isolation is always a better choice for an integrated charging system. At present, the main idea of adding electrical isolation function to the integrated vehicle charging system is to add or construct an isolation transformer in the power stage. For vehicle manufacturers, adding an isolation transformer will significantly increase the cost and quality of the vehicle, and occupy the limited space in the vehicle, which is inconsistent with the current trend of vehicle lightweighting. On the other hand, the electric vehicle field puts forward higher requirements for the speed regulation range and fault tolerance of the motor and its drive system. Therefore, it inherits the high efficiency and high power density characteristics of the traditional permanent magnet motor, and at the same time has the electric excitation motor. The hybrid excitation type flux-switching motor with the ability to directly adjust the magnetic field has received more and more attention in the field of electric vehicles. When the hybrid excitation type motor constructs an integrated charging system, due to its special motor structure and electromagnetic characteristics, it will be It has a variety of advantages and provides a new technical solution for the development of integrated charging systems.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a high-frequency transformer integrated dual-module magnetic flux switching motor.

The present invention is achieved through the following technical solutions:

A high-frequency transformer integrated dual-module magnetic flux switching motor includes a stator assembly and a rotor assembly, the stator assembly includes a stator module, and the stator module includes a plurality of stator cores arranged around the circumference and wound on each stator core The first armature winding, the second armature winding, the third armature winding and a plurality of permanent magnets are arranged between the stator cores, and the stator cores are of a double E-type structure; the rotor assembly includes a rotating shaft and a Two sets of rotor modules are arranged in the axial direction of the rotating shaft, the rotor modules include a plurality of rotor teeth, and an included angle exists along the circumferential direction between the rotor teeth on the two rotor modules.

According to the above technical solution, preferably, the stator assembly includes two sets of coaxially arranged stator modules, a magnetic isolation ring is arranged between the two stator modules, the stator modules include 12 stator cores, and the stator modules include 12 permanent magnets, each of which is magnetized tangentially, the magnetization directions of adjacent permanent magnets in each stator module are opposite, and the magnetization directions of permanent magnets at the same position of two stator modules are opposite. The rotor module includes 20 rotor teeth, and the difference between the rotor teeth on the two rotor modules is 9° in the circumferential direction.

According to the above technical solution, preferably, the first armature winding and the second armature winding are both wound on the stator yokes of the two stator cores distributed in the axial direction, and the third armature winding is wound on the stator core. on the middle teeth. The first armature winding, the second armature winding and the third armature winding respectively include an A-phase winding, a B-phase winding and a C-phase winding, and the phase difference between the A-phase winding, the B-phase winding and the C-phase winding is Electrical angle 120°.

The beneficial effects of the present invention are:

First, this patent reconstructs the motor structure into a transformer, so that the electric vehicle drive system and the charging system are highly integrated in the limited space in the vehicle, simplifying the vehicle charging system and realizing the high integration of charging equipment; second, the present invention has pure permanent magnets. There are two operating modes of excitation and hybrid excitation. When the permanent magnet has an irreversible demagnetization fault, the size of the air-gap magnetic field can be adjusted by changing the current intensity of the excitation winding, so as to maintain the normal operation of the motor and improve the fault tolerance of the motor to meet the needs of different working conditions. Third, the first armature winding and the second armature winding of the present invention are magnetically isolated and redundant with each other. When one set of armature windings fails, the other set of armature windings can work normally. Maintain the short-term stable operation of the motor in the state of fault, and improve the reliability and safety of the motor operation.

Description of drawings

FIG. 1 is a schematic view of the three-dimensional structure of the present invention.

FIG. 2 is a schematic perspective view of the rotor assembly part of the present invention.

Fig. 3 is a schematic distribution diagram of the windings of the stator module part of the present invention.

FIG. 4 is an assembly structure diagram of the permanent magnet of the present invention.

FIG. 5 is a schematic three-dimensional structure diagram of the magnetic isolation ring part of the present invention.

FIG. 6 is a schematic diagram of the operation mode of the high-frequency transformer of the motor of the present invention.

FIG. 7 is a schematic diagram of the motor drive operation mode of the present invention.

In the figure: 1, stator assembly; 2, rotor assembly; 3, stator module; 4, magnetic isolation ring; 5, stator core; 6, permanent magnet; 7, first armature winding; 8, third armature winding; 9. Second armature winding; 10. Intermediate teeth; 11. Rotor module; 12. Rotating shaft.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and the best embodiments. Based on the embodiments in the invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the invention.

In the description of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operation, and therefore should not be construed as a limitation of the invention.

As shown in the figure, the present invention includes a stator assembly 1 and a rotor assembly 2 , the stator assembly 1 includes a stator module 3 , and the stator module 3 includes a plurality of stator cores 5 arranged around the circumference and wound on each stator core 5 The first armature winding 7, the second armature winding 9, the third armature winding 8, and the plurality of permanent magnets 6 arranged between the stator cores 5, the stator cores 5 are double E-type structures, the specific structure The stator iron cores 5 of the two E-shaped structures are anti-parallel together, so that the stator iron core 5 has a stator yoke and intermediate teeth 10 . The rotor assembly 2 includes a rotating shaft 12 and two sets of rotor modules 11 axially arranged along the rotating shaft 12. The rotor modules 11 include a plurality of rotor teeth, and there are clips between the rotor teeth on the two rotor modules 11 in the circumferential direction. horn. The stator core 5 and the rotor module 11 are both made of silicon steel sheets, and an air gap exists between the stator assembly 1 and the rotor assembly 2 .

According to the above embodiment, preferably, the stator assembly 1 includes two sets of coaxially arranged stator modules 3 , a magnetic isolation ring 4 is arranged between the two stator modules 3 , and the magnetic isolation ring 4 is located between the two stator modules 3 . Meanwhile, its structure is the same as the structure after each stator core 5 is embedded with the permanent magnets 6 . The stator module 3 includes 12 stator cores 5, the stator module 3 includes 12 permanent magnets 6, and the permanent magnets 6 are made of NdFeB, Samarium Cobalt or ferrite permanent magnet materials, and each of the permanent magnets 6 Both are tangential magnetization, the magnetization directions of the adjacent permanent magnets 6 in each stator module 3 are opposite, and the magnetization directions of the permanent magnets 6 in the same position of the two stator modules 3 are opposite.

According to the above embodiment, preferably, the first armature winding 7 and the second armature winding 9 are both wound on the stator yokes of the two stator cores 5 distributed in the axial direction, and the third armature winding 8 is wound on On the intermediate teeth 10 of the stator core 5, the armature winding is wound around the yoke of the stator core 5 and separated from the permanent magnet 6, which effectively prevents the permanent magnet 6 from demagnetizing at high temperature caused by the heating of the armature coil during the working process of the motor. Among them, the first armature winding 7 and the second armature winding 9 can operate in series, in parallel or independently according to the working conditions, and the magnetic circuit where the third armature winding 8 is located is connected with the first armature winding 7 and the second armature winding. The magnetic circuits of 9 are connected in series, and the third armature winding 8 can be connected to the DC power supply and used as the excitation winding, or can be connected to the grid side and used as the primary side winding of the high-frequency transformer.

According to the above embodiment, preferably, the first armature winding 7 , the second armature winding 9 and the third armature winding 8 respectively include A-phase windings, B-phase windings and C-phase windings, and the A-phase windings , The electrical angle difference between the B-phase winding and the C-phase winding is 120°. Specifically, the first armature winding and the second armature winding are set as two identical windings. Since the rushing directions of the adjacent permanent magnets 6 are opposite, the winding methods of the adjacent windings are also opposite. 3 It can be determined that in the first armature winding 7 and the second armature winding 9, the A-phase winding includes four coils of a1, a2, a3 and a4, the B-phase winding includes four coils of b1, b2, b3 and b4, and the C-phase winding includes four coils. The phase winding includes four coils c1, c2, c3 and c4. For the third armature winding, for the same reason that the magnetic directions of the adjacent permanent magnets 6 are opposite, the winding methods of the adjacent windings are also opposite. It can also be determined from FIG. 3 that in the third armature winding 8, the A-phase winding It includes four coils of a1, a2, a3 and a4, the B-phase winding includes four coils of b1, b2, b3 and b4, and the C-phase winding includes four coils of c1, c2, c3 and c4.

According to the above embodiment, preferably, the rotor module 11 includes 20 rotor teeth, the rotor teeth on the two rotor modules 11 differ by 9° in the circumferential direction, wherein the spatial position difference between the two rotor modules 11 is π/Pr (wherein Pr is the number of rotor teeth, in this paper Pr=20), the magnetizing direction of the permanent magnets 6 in the same position of the adjacent two stator modules 3 is opposite to the magnetic field direction of the excitation coil, so that the first armature winding 7 and the second armature winding 9 The even-order harmonics of the permanent magnetic flux linkage are canceled, and the permanent magnetic flux linkage is closer to a sine wave.

The invention has two operation modes: driving mode and charging mode: in the driving mode, the third armature windings on the stator are connected in series as excitation windings to adjust the permanent magnet magnetic field and improve the speed regulation range and overload capacity of the motor; In the charging mode, the third armature winding on the stator is reconstructed into a three-phase AC winding as the primary winding of the transformer and connected to the power grid. The first armature winding and the second armature winding are respectively used as the secondary winding of the transformer with the inverter as The battery pack is charged.

Based on the above solution, the present invention has the following technical effects: First, this patent reconstructs the motor structure into a transformer, so that the electric vehicle drive system and the charging system are highly integrated in the limited space in the vehicle, simplifying the vehicle charging system and realizing the high integration of charging equipment Second, the present invention has two operation modes: pure permanent magnet excitation and hybrid excitation. When irreversible demagnetization fault occurs in the permanent magnet, the size of the air gap magnetic field can be adjusted by changing the current intensity of the excitation winding to maintain the normal operation of the motor. The fault tolerance capability of the motor is improved to meet the requirements under different working conditions; thirdly, the first armature winding and the second armature winding of the present invention are magnetically isolated and redundant with each other. When a set of armature windings fails , the other set of armature windings can work normally, maintain the short-term stable operation of the motor in the fault state, and improve the reliability and safety of the motor operation.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides a high frequency transformer integration bimodulus magnetic flux switching motor, includes stator module and rotor subassembly, its characterized in that:

the stator assembly comprises a stator module, the stator module comprises a plurality of stator cores arranged around the stator module, a first armature winding, a second armature winding, a third armature winding and a plurality of permanent magnets, the first armature winding, the second armature winding and the third armature winding are wound on the stator cores, and the permanent magnets are arranged between the stator cores;

the rotor subassembly includes the pivot and follows two sets of rotor module of pivot axial setting, rotor module includes a plurality of rotor teeth, two there is the contained angle along the circumferencial direction between the rotor tooth on the rotor module.

2. The high-frequency transformer integrated double-module flux switching motor according to claim 1, characterized in that: the stator core is of a double-E-shaped structure.

3. The high-frequency transformer integrated double-module flux switching motor according to claim 2, characterized in that: the stator assembly comprises two groups of stator modules which are coaxially arranged, and a magnetism isolating ring is arranged between the two stator modules.

4. The high-frequency transformer integrated double-module flux switching motor according to claim 3, characterized in that: the first armature winding and the second armature winding are wound on stator yoke parts of two axially distributed stator iron cores, and the third armature winding is wound on middle teeth of the stator iron cores.

5. The high-frequency transformer integrated double-module flux switching motor according to claim 3 or 4, characterized in that: the stator module includes 12 stator cores.

6. The high-frequency transformer integrated double-module flux switching motor according to claim 5, characterized in that: the stator module comprises 12 permanent magnets, each permanent magnet is magnetized tangentially, the magnetizing directions of the adjacent permanent magnets in each stator module are opposite, and the magnetizing directions of the permanent magnets at the same positions of the two stator modules are opposite.

7. The high-frequency transformer integrated double-module flux switching motor according to claim 5, characterized in that: the first armature winding, the second armature winding and the third armature winding respectively comprise an A-phase winding, a B-phase winding and a C-phase winding, and the A-phase winding, the B-phase winding and the C-phase winding are different in electrical angle by 120 degrees.

8. The high-frequency transformer integrated double-module flux switching motor according to claim 1, characterized in that: the rotor module comprises 20 rotor teeth, and the rotor teeth on the two rotor modules are different from each other by 9 degrees along the circumferential direction.

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