Rotor laminations, rotors and motors

Abstract

The invention relates to the technical field of motors, and discloses a rotor punch, a rotor and a motor. A plurality of magnetic tile accommodating grooves arranged at intervals in the circumferential direction are formed on the outer peripheral surface of the rotor punch. At least one location is formed with a radially inwardly extending cavity. When the magnetic tile is placed in the magnetic tile accommodating groove, due to the avoidance space formed by the concave cavity at both ends of the magnetic tile in the circumferential direction, the edge of the magnetic tile can be reduced without affecting the main magnetic circuit of the magnetic tile. Flux leakage can effectively reduce or avoid demagnetization of magnetic tiles. At the same time, it can also reduce torque ripple and cogging torque to a certain extent, thereby increasing the maximum output torque of the motor, increasing the efficiency of the motor, and increasing the application range of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a rotor punch, a rotor and a motor. Background technique [0002] At present, permanent magnet motors are more and more widely used in various industries due to their significant advantages such as high power density, good dynamic performance, and flexible shapes and sizes. The rotor structure of permanent magnet motors is currently roughly divided into two categories: surface mount type and built-in type. [0003] For the surface-mounted rotor structure, grooves are punched or cut out on the outer peripheral surface of the rotor punch. When multiple rotor punches are axially stacked, the grooves will form axially extending magnetic tile accommodation grooves, so that , the magnetic tiles can be directly arranged in the magnetic tile accommodating slots, so that the magnetic tiles are arranged on the entire outer peripheral surface of the rotor. [0004] However, the applicant's...

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Problems solved by technology

[0004] However, the applicant's technicians found in practice that in this surface-mounted rotor structure, there is more magnetic leakage at the edge of the magnetic tile, which affects the output torque of the motor; at the same time, irreversible demagnetization easily occurs at the edge of the magnetic tile, and the The maximum output torque will be limited, and the torque ripple of the motor will deteriorate, seriously affecting the performance of the motor

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