Squirrel cage adjustable magnetic motor

Abstract

The invention belongs to the field of motors, and discloses a squirrel cage adjustable magnetic motor which comprises a stator and a squirrel cage ring rotor, an armature winding is wound on the stator, stator permanent magnets are attached to stator tooth portions, and the squirrel cage ring rotor is located on the inner side of the motor. The squirrel cage ring rotor is composed of a rotor iron core and a squirrel cage ring. The squirrel cage ring is composed of a squirrel cage iron core and squirrel cage strips. The stator permanent magnets adopt adjacent heteropolar magnetization, and the adjacent stator permanent magnets on the stator tooth parts have the same polarity and adopt radial magnetization. The squirrel-cage ring rotor adopted by the invention is similar to a reluctance rotor of a magnetic flux reverse motor, and the reluctance rotor teeth are designed to be squirrel-cage ring rotor teeth, so that on one hand, a magnetic field modulation principle is met, and the torque output level of the motor can be improved; on the other hand, the rich harmonic characteristics of the squirrel cage rings can be utilized, so that the useful harmonic content is improved, and additional torque output is generated.

Description

Technical Field

[0001] The invention relates to the field of motors, and in particular to a squirrel cage magnetically adjustable motor. Background Art

[0002] In 1990, Professor Boldea proposed a three-phase permanent magnet flux reversal motor and derived its basic design method and theoretical model. The biggest feature of the permanent magnet flux reversal motor is that permanent magnets are placed on the inner surface of the stator teeth and each stator tooth has a permanent magnet with opposite polarity. The basic working principle of the permanent magnet flux reversal motor is that when the reluctance rotor rotates to the point where the rotor teeth are facing the N-pole permanent magnet, the winding flux can reach the maximum; similarly, when the rotor teeth are facing the S-pole, the winding flux can reach the minimum (reverse maximum). The predecessor of the permanent magnet flux reversal motor is the switched reluctance motor. Later, with the development of high-performance permanent magnet materials, permanent magnet materials were gradually introduced into the switched reluctance motor, resulting in a double-salient permanent magnet motor. The double-salient permanent magnet motor inserts tangentially magnetized permanent magnets into the stator yoke. When the reluctance rotor rotates one circle, the winding flux will increase first and then decrease. With the continuous research on this type of motor topology, considering the placement of permanent magnets in the stator, the permanent magnet switched flux motor and permanent magnet flux reversal motor have gradually evolved.

[0003] Unlike traditional permanent magnet motors, the stator armature winding and permanent magnets of the flux reversal motor are both located on the stator. The motor structure is stable and simple, and the rotor is a salient pole reluctance rotor, which has high reliability and is especially suitable for high-speed operation. With the continuous deepening of research, the research on flux reversal motors has focused on improving torque density, reducing torque pulsation, and reducing permanent magnet leakage. As a result, related topological models and optimization methods have evolved, such as surface-mounted, alternating pole, built-in, V-shaped and other permanent magnet flux reversal motors, as well as rotor skew slots, virtual slots, chamfers and other optimization methods.

[0004] In conventional flux reversal motors, due to their working characteristics, only half of the permanent magnets provide the main magnetic flux at any time, while the other half of the permanent magnets will produce leakage flux. Therefore, the utilization rate of the permanent magnets is low, which leads to large inter-pole leakage flux and average torque density. In addition, the power factor of conventional flux reversal motors is also low. Summary of the invention

[0005] The purpose of the present invention is to disclose a squirrel cage magnetic motor to solve the technical problems raised in the background technology.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] On the one hand, the present invention provides a squirrel cage magnetic motor, comprising a stator and a squirrel cage ring rotor, wherein an armature winding is wound on the stator, a stator permanent magnet is attached to a stator tooth portion, and the squirrel cage ring rotor is located inside the motor;

[0008] The squirrel cage ring rotor is composed of a rotor iron core and a squirrel cage ring, and the squirrel cage ring is composed of a squirrel cage iron core and squirrel cage bars;

[0009] The stator permanent magnets are magnetized with adjacent different poles, and the adjacent stator permanent magnets on the stator teeth have the same polarity and are magnetized radially.

[0010] Preferably, the squirrel cage ring is provided with a plurality of grooves, the squirrel cage bars are embedded in the grooves and the ends are welded with end rings, the squirrel cage bars are made of cast copper, and the squirrel cage iron core can play the role of fixing and conducting electricity and magnetism.

[0011] Preferably, the material of the stator permanent magnet is neodymium iron boron material, and the stator permanent magnet is a block structure.

[0012] Preferably, the number of stator permanent magnet pole pairs is p e , stator teeth number Z s The relationship between the number of permanent magnet pole pairs is Z s =2p e .

[0013] Preferably, the number of squirrel cage bars is represented by n, and the total number of slots is p f n, where p f is the number of cage rings.

[0014] Preferably, the number of cage rings p f 、Armature winding pole pair number p a The number of permanent magnet pole pairs p e The relationship between f =p a +p e .

[0015] Preferably, the number of permanent magnet pole pairs, the number of squirrel cage rings, and the number of stator teeth must conform to the pole-slot matching and a distributed full-pitch winding is used to increase the winding coefficient.

[0016] Beneficial effects:

[0017] The squirrel cage ring rotor used in the present invention is similar to the reluctance rotor of the flux reversal motor. The reluctance rotor teeth are designed as squirrel cage ring rotor teeth. On the one hand, it conforms to the magnetic field modulation principle and can improve the motor torque output level; on the other hand, it can utilize the rich harmonic characteristics of the squirrel cage ring to increase the useful harmonic content, thereby generating additional torque output. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a squirrel cage magnetic motor of the present invention.

[0020] FIG. 2 is a schematic diagram of the number of cage bars of the present invention.

[0021] Figure 3 Schematic diagram of the parameters of the pole-slot coordination of a squirrel cage magneto.

[0022] Figure 4 This is a schematic diagram of the topology of the alternating pole squirrel cage magnetic motor.

[0023] Figure 5 This is a schematic diagram of the topology of the Halbach permanent magnet squirrel cage motor.

[0024] Figure 6 This is a topology diagram of a permanent magnet switched flux motor.

[0025] Figure 7 Schematic diagram of a squirrel cage rotor.

[0026] Figure 8 for Figure 7 An enlarged schematic diagram of part A in FIG. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the present invention provides a squirrel cage magnetic motor, comprising a stator 1 and a squirrel cage rotor 4, an armature winding 2 is wound on the stator 1, a stator permanent magnet 3 is attached to the stator teeth, and the squirrel cage rotor 4 is located inside the motor;

[0029] The squirrel cage ring rotor 4 is composed of a rotor core 4.1 and a squirrel cage ring 4.2, and the squirrel cage ring 4.2 is composed of a squirrel cage core 4.2.1 and squirrel cage bars 4.2.2;

[0030] Figure 7 Schematic diagram of the squirrel cage rotor 4. Figure 8 for Figure 7 An enlarged schematic diagram of part A in FIG.

[0031] The cage bars can be composed of different numbers of 1, 2, 3...m, such as Figure 2a , Figure 2b , Figure 2cAs shown, there are 4-copper-bar cages, 5-copper-bar cages, 6-copper-bar cages, etc., and there are various copper-bar number structures in the copper conductor bars of a single cage ring. The above technical cases are technical implementations of the present invention and are not intended to limit the protection scope of the present invention.

[0032] The stator permanent magnets 3 are magnetized with adjacent opposite poles, and the adjacent stator permanent magnets 3 on the stator teeth have the same polarity and are magnetized radially.

[0033] Preferably, the cage ring 4.2 is provided with a plurality of grooves, the cage bars 4.2.2 are embedded in the grooves and end rings are welded at the ends, the cage bars 4.2.2 are made of cast copper, and the cage core 4.2.1 can play the role of fixing and conducting electricity and magnetism.

[0034] The rotor core is embedded with a cage ring structure, which is composed of cage bars and cage core. The end ring actually refers to the structure where the ends of the cage bars are welded together.

[0035] Preferably, the material of the stator permanent magnet 3 is neodymium iron boron material, and the stator permanent magnet 3 is a block structure.

[0036] Preferably, the number of stator permanent magnet pole pairs is p e , stator teeth number Z s The relationship between the number of permanent magnet pole pairs is Z s =2p e .

[0037] Preferably, the number of cage bars 4.2.2 is represented by n, and the total number of slots is p. f n, where p f is the number of cage rings.

[0038] Preferably, the number of cage rings p f 、Armature winding pole pair number p a The number of permanent magnet pole pairs p e The relationship between f =p a +p e .

[0039] The above-mentioned stator permanent magnet pole pairs, squirrel cage rings, and stator teeth must meet the pole-slot matching and use distributed full-pitch winding to increase the winding coefficient. For specific pole-slot matching selection, please refer to Figure 3 .

[0040] Preferably, the number of permanent magnet pole pairs, the number of squirrel cage rings, and the number of stator teeth must conform to the pole-slot matching and a distributed full-pitch winding is used to increase the winding coefficient.

[0041] The squirrel cage magnetic motor can be formed into different squirrel cage magnetic motors according to different structural topologies of the flux reversal motor, such as alternating pole type, Halbach permanent magnet type, permanent magnet switch flux linkage motor, etc. Figure 4 , 5 , as shown in Figure 6.

[0042] The squirrel cage ring rotor used in the present invention is similar to the reluctance rotor of the flux reversal motor. The reluctance rotor teeth are designed as squirrel cage ring rotor teeth. On the one hand, it conforms to the magnetic field modulation principle and can improve the motor torque output level; on the other hand, it can utilize the rich harmonic characteristics of the squirrel cage ring to increase the useful harmonic content, thereby generating additional torque output.

[0043] The squirrel cage ring rotor utilizes the characteristics of the squirrel cage ring. It is both stable in structure and can utilize the characteristics of the squirrel cage rotor. It fully utilizes the harmonic richness of the induced current to generate additional torque, thereby improving the overall torque density.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A squirrel cage magnetic motor, characterized in that: It includes a stator and a squirrel cage rotor, the stator is wound with an armature winding, the stator permanent magnet is attached to the stator teeth, and the squirrel cage rotor is located inside the motor; The squirrel cage ring rotor is composed of a rotor iron core and a squirrel cage ring, and the squirrel cage ring is composed of a squirrel cage iron core and squirrel cage bars; The stator permanent magnets are magnetized with adjacent different poles, and the adjacent stator permanent magnets on the stator teeth have the same polarity and are magnetized radially.

2. The squirrel cage magnetic motor according to claim 1, characterized in that: The squirrel cage ring is provided with a number of grooves, the squirrel cage bars are embedded in the grooves and the end rings are welded to the ends. The squirrel cage bars are made of cast copper, and the squirrel cage iron core can play the role of fixing and conducting electricity and magnetism.

3. The squirrel cage magnetic motor according to claim 1, characterized in that: The material of the stator permanent magnet is neodymium iron boron material, and the stator permanent magnet is a block structure.

4. The squirrel cage magnetic motor according to claim 1, characterized in that: The number of stator permanent magnet pole pairs is p e , stator teeth number Z s The relationship between the number of permanent magnet pole pairs is Z s =2p e .

5. The squirrel cage magnetic motor according to claim 2, characterized in that: The number of cage bars is represented by n, and the total number of slots is p f n, where p f is the number of cage rings.

6. The squirrel cage magnetic motor according to claim 5, characterized in that: Number of cage rings p f 、Armature winding pole pair number p a The number of permanent magnet pole pairs p e The relationship between f =p a +p e .

7. The squirrel cage magnetic motor according to claim 1, characterized in that: The number of permanent magnet pole pairs, the number of squirrel cage rings, and the number of stator teeth must conform to the pole-slot matching and use distributed full-pitch winding to increase the winding coefficient.

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