Motor rotor and manufacturing method, motor, and permanent magnet motor

Abstract

The present invention provides a motor rotor and a manufacturing method as well as a motor and a permanent magnet motor, wherein the motor rotor comprises an outer iron core, an inner iron core, a limiting structure and a vibration reduction structure, wherein a mounting hole is provided at the center of the outer iron core for arranging the inner iron core; a first boss and a first groove extending inward are provided on the inner circumference of the mounting hole, and a second boss extending outward is provided on the outer circumference of the inner iron core; the limiting structure is injection molded at both ends and the outer circumference of the outer iron core, and its cover plate axially limits the inner iron core; the vibration reduction structure is injection molded in a space formed by the inner circumference of the mounting hole, the first boss, the second boss, the first groove and the outer circumference of the inner iron core, which can reduce the vibration of the inner and outer iron cores, and at the same time limit the radial and axial positions of the inner and outer iron cores and transmit the tangential motion; the present invention adopts different materials for injection molding of the limiting structure and the vibration reduction structure, which transmits the tangential motion and effectively limits the inner and outer iron cores, and at the same time reduces the vibration of the inner and outer iron cores.

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