Permanent magnet motor rotor punching sheet with self-starting ability and frequency conversion performance

Abstract

The invention discloses a permanent magnet motor rotor punching sheet with self-starting ability and frequency conversion performance. The punching sheet comprises rotor magnetic poles, permanent magnet slots, permanent magnets, interelectrode slots, and slots which are arranged at the lower parts of the permanent magnet slots and are uniformly distributed. The number of punching poles is larger than or equal to 2, and the number of the magnetic pole permanent magnet slots and the permanent magnets are larger than 1. The magnetic pole angle is 0.75 to 0.8 time of 360 / 2p, and p is the pole pair number of the motor. The outer circle of each of the rotor magnetic poles is a section of arc with is not concentric with the rotor punching sheet, the radius is (0.89-0.96)*R, and R is the outer circle outer diameter of the rotor punching sheet. The permanent magnets are embedded into the permanent magnet slots, and the interelectrode slots are between the adjacent rotor magnetic poles.

Description

Technical field [0001] The invention relates to the field of motors, in particular to a high cost-effective permanent magnet motor rotor punching sheet structure with self-starting capability and excellent working performance of industrial frequency conversion. Background technique [0002] Permanent magnet motors are usually divided into asynchronous starting permanent magnet synchronous motors (with self-starting ability) and variable frequency speed regulating permanent magnet synchronous motors according to different starting and operating modes. At present, these two motors use different rotor punching structures and require two sets of molds. The manufacturing cost is high, the production cycle is long, and the corresponding labor cost is also high, which is not conducive to cost reduction and efficiency increase of enterprises. [0003] The high-performance asynchronous start permanent magnet synchronous motor must meet the high starting quality factor and high efficiency, h...

AI Technical Summary

Problems solved by technology

At present, these two types of motors use different rotor punching structures, which require two sets of molds. The manufacturing cost is high, the production cycle is long, and the corresponding labor cost is also high, which is not conducive to the cost reduction and efficiency increase of enterprises.

[0003] High-performance asynchronous starting permanent magnet synchronous motor must meet high starting quality factor, high efficiency and high power factor at the same time, so the rotor squirrel cage slot and permanent magnet need to have enough design space, such as image 3 As shown, the traditional punching structure often cannot meet such design requirements, and the iron core can only be lengthened to meet the design requirements, which will increase the cost of the motor and cause the market promotion to be limited by the high price

[0004] If the traditional asynchronous start permanent magnet synchronous motor is directly used as a variable frequency speed regulation motor, due to its rotor structure, the magnetic flux often passes through the pole shoes to form a closed magnetic circuit, which will cause the motor to be too saturated, thereby reducing the overload capacity of the motor

Images