Staggered-pole rotor of an electric machine

Abstract

The invention discloses a staggered-pole rotor of an electric machine, which is characterized in that: a rotating shaft is uniformly and vertically provided with n (n>= 2, n is an integer) inward concave positioning key grooves on the surface thereof. The iron core is sleeved on the rotating shaft, the iron core is composed of 2n-segment ring-shaped sub-iron core surfaces, and each inner ring of the sub-iron core is provided with a positioning key protruding inward, wherein each positioning key slot is matched with two overlapping positioning keys of the sub-iron core. Through the motor staggered rotor of the invention, the staggered pole of the multi-segment rotor can be realized by using a set of moulds.

Description

technical field [0001] The invention relates to the technical field of electric motors, in particular to an electric motor with a wrong pole rotor. Background technique [0002] At present, permanent magnet synchronous motors mainly reduce harmonics and reduce cogging torque through the way of rotor staggered poles. The current way of rotor staggered poles: on the rotating shaft, the rotor positioning key is offset from the magnetic center of the N pole or S pole of the permanent magnet. Move an angle A, then flip the rotor core to realize the two-stage wrong pole of the rotor, and the wrong pole angle is 2A. In this scheme, a set of molds can only realize the wrong pole of the two-stage rotor core, reducing harmonics and reducing the cogging torque. The effect is not obvious, which increases the difficulty of the motor design stage. Due to the limitation of the process, when the number of wrong pole segments is greater than 2, multiple sets of molds are used to realize mul...

AI Technical Summary

Problems solved by technology

[0002] At present, permanent magnet synchronous motors mainly reduce harmonics and reduce cogging torque through the way of rotor staggered poles. The current way of rotor staggered poles: on the rotating shaft, the rotor positioning key is offset from the magnetic center of the N pole or S pole of the permanent magnet. Move an angle A, then flip the rotor core to realize 2-stage wrong poles, the wrong pole angle is 2A, this scheme can only realize 2-stage rotor core wrong poles, reduce harmonics, and reduce the effect of cogging torque The effect is not obvious, increasing the difficulty of the motor design stage

Due to the limitation of the process, when the number of pole-staggered sections is greater than 2, multiple sets of molds are used to realize the pole-staggered rotors of multiple sections, which increases the mold investment cost and the angle of pole-staggered is small, and the rotor cores of different sections are not easy to identify, which is not conducive to the rotor core. core site management

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