Double-winding modular bearingless magnetic flux switching permanent magnet motor

Abstract

The invention discloses a double-winding modular bearingless magnetic flux switching permanent magnet motor which comprises a rotor iron core, a stator iron core, permanent magnets, 4m armature coils and 4m suspension coils, wherein m is the phase number of the motor, both the rotor iron core and the stator iron core are salient pole structures, the stator iron core is formed by the alternating splicing of 4m E-shaped iron core units and 4m permanent magnets, the magnetizing directions of the permanent magnets are tangential, the magnetizing directions of the adjacent permanent magnets are opposite, a projected tooth in the middle of each of the E-shaped iron core units is a stator fault tolerance tooth, both the armature coils and the suspension coils are sleeved on stator permanent magnet teeth, and the stator fault tolerance tooth is provide with a coil. The motor has the simple structure of a bearingless switch reluctance motor, the high efficiency and high power density of a bearingless rotor permanent magnet motor, and high theoretical and practical values.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, and in particular relates to a bearingless magnetic flux switching permanent magnet motor with a solid and simple rotor and a complementary modular winding structure. Background technique [0002] Bearingless motor is a new type of motor that integrates the functions of rotary drive and magnetic bearing. It not only overcomes many limitations of magnetic bearing motors, but also has high axial utilization, compact structure, can greatly increase critical speed, and has the same shaft length. Can greatly improve the output power and other advantages. Throughout the literature published at home and abroad, the types of motors using bearingless technology mainly include asynchronous motors, reluctance motors and permanent magnet synchronous motors (both refer to rotor permanent magnet type, the same below). Bearingless asynchronous motor has become the earliest researched type of bearin...

AI Technical Summary

Problems solved by technology

However, the existing bearingless permanent magnet synchronous motors with traditional rotor permanent magnet structure have certain limitations: on the one hand, the permanent magnets mounted on the rotor surface or embedded in the rotor destroy the overall structure of the rotor, while as For high-speed motors, the rotors are usually in a high-speed or even ultra-high-speed operating state (tens of thousands of revolutions per minute or even hundreds of thousands of revolutions per minute). Fixing devices made of stainless steel or metal fiber materials lead to complex structures, increased manufacturing costs, long equivalent air gaps, and reduced utilization of permanent magnets; As the temperature rises, the performance of the permanent magnet mainly composed of neodymium-iron-boron (NdFeB) will decline, and even irreversible demagnetization will occur in severe cases, which restricts the further improvement of the motor performance, and thus limits the application of the bearingless rotor permanent magnet motor in some occasions. Applications

[0004] In summary, the bearingless switched reluctance motor and the bearingless rotor permanent magnet motor have their own disadvantages: although the former has a simple structure and high reliability, it is inferior to permanent magnet motors in terms of efficiency and power factor; although the latter improves The efficiency and power factor of the motor, but the permanent magnet is placed in the motor rotor, and its heat dissipation and mechanical firmness cannot be ignored

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