Motor rotor punching plate for deep groove type three-groove continuous structure

Abstract

The invention discloses a motor rotor punching plate for a deep groove type three-groove continuous structure and relates to the field of a motor. A three-phase asynchronous motor rotor punching plate is mostly a single-groove open groove structure, is easy to have burrs during processing, the groove shape may cause uneven magnetic density distribution, which affects the material utilization rate and motor power density. A punching plate groove is the elongated closed groove shape of a deep groove type continuous structure and includes a first groove portion, a connecting groove portion and a second groove portion which are continuously communicated from a radial outer side to a radial inner side of the punching plate, the first groove portion is a polygonal structure, the connecting groove portion is a rectangular structure in the bottle neck shape, the second groove portion is an isosceles trapezoid, the cross-sectional area of the second groove portion is larger than the first groove portion, the cross-sectional area of the first groove portion is larger than the connecting groove portion, and a distance between the top of the punching plate groove and an outer circle of the punching plate is twice the air gap. The punching plate is advantaged in that the skin effect during start of a motor is utilized for optimization, electromagnetic noise is effectively reduced, additional loss on a rotor surface and groove pulsation loss are reduced, starting performance is improved, and motor efficiency is improved.

Description

technical field [0001] The invention relates to the field of electric motors, in particular to a punched sheet of a motor rotor with a deep groove type three-slot continuous structure. Background technique [0002] At present, the rotor punches used in three-phase asynchronous motors are mostly single-slot open slot structure, and the slot shape of the open slot rotor is prone to burrs during actual processing, which will have a negative impact on the noise of the motor; for some special working conditions If the motor has high efficiency under the rated state and excellent starting performance during the starting process, the traditional convex groove design of the rotor can control the starting current and increase the starting torque, but it will cause magnetic density The distribution of the upper part of the rotor teeth is too sparse and the lower part is saturated, which affects the material utilization rate and the power density of the motor. For this reason, the pre...

AI Technical Summary

Problems solved by technology

[0002] At present, the rotor punches used in three-phase asynchronous motors are mostly single-slot open slot structures. In actual processing, the slot shape of the open slot rotor is prone to burrs, which will have a negative impact on the noise of the motor; for some special working conditions If the motor has high efficiency under the rated state and excellent starting performance during the starting process, the traditional convex groove design of the rotor can control the starting current and increase the starting torque, but it will cause magnetic density The distribution of the upper part of the rotor teeth is too sparse and the lower part is saturated, which affects the material utilization rate and the power density of the motor.

Images