Segmented phase-shift start permanent magnet synchronous motor with variable pole and variable speed

Abstract

The invention discloses a segmental phase-shifting starting pole-changing variable-speed permanent-magnet synchronous motor, and relates to a permanent-magnet synchronous motor. After the pole-changing variable-speed permanent-magnet synchronous motor is powered on, the voltage phase difference between a first stator winding and a second stator winding is ninety degrees of electric angles, and the spatial difference between a first stator pole shoe and a second stator pole shoe is ninety degrees of electric angles. A first stator magnetic field is formed on the radial inner surface of the first stator pole shoe by the first stator winding, a second stator magnetic field is formed on the radial inner surface of the second stator pole shoe by the second stator winding, a stator rotating magnetic field is formed in an air gap of the motor, a magnetic line of the stator rotating magnetic field is cut by a cage guide bar of a rotor cage to generate asynchronous starting torque, and a rotor component is drawn into synchronous speed. The pole-changing variable-speed permanent-magnet synchronous motor can realize two-pole synchronous running or six-pole synchronous running and has the advantage of high motor efficiency. The first stator winding and the second stator winding are centralized windings, machining automation is high, and labor cost is low.

Description

technical field [0001] The present invention is a segmented phase-shift starting permanent magnet synchronous motor, which relates to a permanent magnet synchronous motor, in particular to a pole-changing variable-speed permanent magnet synchronous motor which adopts a centralized stator winding and can be started asynchronously with segmental phase shifting. Magnetic synchronous motor. Background technique [0002] There is also a squirrel cage on the rotor part of the ordinary asynchronous start permanent magnet synchronous motor, and the distributed stator winding is still used to generate the stator rotating magnetic field. The degree of automation in the assembly process of distributed stator windings is low, and the labor cost is relatively high, especially in the cost of small-power motors with small diameters, labor costs account for a large proportion. The performance-price ratio of common asynchronous starter permanent magnet synchronous motor is low, which restri...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of ordinary asynchronous starting permanent magnet synchronous motors that still use distributed stator windings and high labor costs, and provide a pole-changing and speed-changing permanent magnet synchronous motor that uses centralized stator windings and can start asynchronously with segmental phase shifting electric motor

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