A brushless power feedback permanent magnet speed control device combining axial and radial magnetic flux

Abstract

The invention discloses an axial and radial magnetic flux combined brushless power feedback type permanent magnet speed regulation device. The device comprises an axial and radial magnetic flux combined permanent magnet speed regulator and a slip power feedback control unit; the permanent magnet speed regulator comprises a permanent magnet rotor, a conductor rotor and a three-phase winding statorwhich are concentrically installed; the permanent magnet rotor is fixed to an input shaft and connected with a prime motor; the conductor rotor is fixed to an output shaft and connected with a load; the three-phase winding stator is fixed to a machine shell and connected with the output shaft through a bearing; an axial air gap and a radial air gap exist between the permanent magnet rotor and theconductor rotor; an axial air gap exists between the three-phase winding stator and the conductor rotor; and a stator side winding is connected with the slip power feedback control unit. The space utilization rate of the speed regulator is improved; the torque density of the speed regulator is correspondingly improved; the brushless transmission of the slip power of the conductor rotor to the three-phase winding stator is realized; and stator side power is fed back to a power grid; and the efficient operation of the speed regulator under any operation condition is realized.

Description

technical field [0001] The invention relates to a permanent magnet governor, in particular to a brushless power feedback type permanent magnet governor combined with axial and radial flux. Background technique [0002] With the promotion and application of high-performance permanent magnet materials, the permanent magnet speed control technology, which has developed rapidly, is a new type of speed control and energy-saving technology for motor drive systems applied between the prime mover and the load. The speed-regulating permanent magnet coupler has a good energy-saving effect, reduces operating costs, and can also realize the soft start and soft stop functions of the motor. It can operate in harsh environments such as flammable, explosive, humid, and high dust content, and it is a mechanical structure that can adapt to situations such as unstable power grid quality and impact loads caused by current changes. Mainly used in the chemical industry, petrochemical industry, c...

AI Technical Summary

Problems solved by technology

[0004] The above two mainstream permanent magnet eddy current speed control devices with traditional structures have the following shortcomings: (1) Both need to use electric actuators to translate the permanent magnet rotor or conductor rotor in the axial direction

As a result, the structure of the electric actuator is complicated, the mechanical strength is high, and the space occupied in the axial direction is relatively large. As a product installed between the prime mover and the load of the pump and fan, it is used for speed regulation and energy-saving industrial transformation. (2) The traditional permanent magnet eddy current governor usually adopts axial or radial flux structure, which does not make full use of the space utilization of the governor, and the conductor part of the conductor rotor of the traditional permanent magnet eddy current governor Usually, a copper layer of uniform thickness is fixed on the surface of the conductor rotor core, and the magnetic permeability of the conductor part is close to that of air, which increases the reluctance of the magnetic circuit, causes the strength of the air gap magnetic field to weaken, and reduces the permanent magnet speed regulation to a certain extent. (3) In the traditional permanent magnet eddy current governor, the slip power between the permanent magnet rotor and the conductor rotor is converted into the eddy current loss of the conductor part of the conductor rotor, which is consumed in the form of heat energy, resulting in high The problem of low efficiency of the governor itself during slip operation

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