Permanent magnet synchronous motor

Abstract

The present invention provides a permanent magnet synchronous motor, belonging to the technical field of motors. The permanent magnet synchronous motor is characterized by: adoption of a solid shuttle-shaped rotor structure; a large radial air gap and an axial non-constant air gap; a permanent magnet adopting a radial buried structure; a starting squirrel cage embedded on the rotor; and the rotor and a stator both provided with corresponding ventilation ducts that facilitate cooling air which passes through the large radial air gap to take away heat of the surface of the solid rotor and heat of the stator itself. The permanent magnet synchronous motor in the invention not only solves a problem of starting difficulty in a permanent magnet motor having a conventional laminated rotor, but also solves a problem of heat dissipation difficulty in a permanent magnet motor having a conventional solid rotor. The permanent magnet synchronous motor in the invention with a starting torque from 2.0 to 3.0 further overcomes a problem of easy demagnetization of the permanent magnet caused by a too high temperature of the rotor.

Description

technical field [0001] The invention relates to a synchronous motor excited by permanent magnet materials, which belongs to the technical field of electric motors. Background technique [0002] At present, the consensus in the motor industry is that three-phase AC permanent magnet synchronous motors are superior to Y-series asynchronous motors because of their high efficiency, flat efficiency curve, and high power factor. They are the main direction for the future development of the motor industry. Moreover, the development direction of high-efficiency and energy-saving motors is also in line with the country's energy-saving and emission-reduction policies, and has also been vigorously promoted by the country. However, there are many problems in the three-phase AC permanent magnet synchronous motor. For example: the laminated magnetic pole rotor has the problem of insufficient starting torque; and the three-phase AC permanent magnet synchronous motor using frequency convers...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, in order to solve the problems that the permanent magnet synchronous motor has fast temperature rise, high operating temperature, and easy demagnetization of the magnet steel, and proposes a new permanent magnet synchronous motor structure, which further has self- start function

Images