Rotor punching structure for permanent-magnet servo motor

Abstract

The invention provides a rotor punching structure for a permanent-magnet servo motor, and the structure comprises a rotor punching body. The peripheral surface of the rotor punching body is provided with permanent magnet tanks, and the interior of each permanent magnet tank is provided with a permanent magnet in an embedded manner. The external circle of the rotor punching body above the permanent magnet tanks is not concentric with the internal circle of a stator. The rotor punching body above the permanent magnet tanks is provided with magnetic isolation holes which are arranged horizontally, and the rotor punching body below the permanent magnet tanks is provided with an axial cooling channel. The permanent magnet tanks are radially arranged in a layered manner, and magnetic isolation tanks are respectively disposed between the adjacent permanent magnet tanks. Magnetic isolation bridges are disposed among the magnetic isolation tanks and the permanent magnet tanks. Through the improvement of the rotor punching structure and the control of the direction of a magnetic field, the nonlinear impact, caused by the coupling of quadrature-axis and direct-axis magnetic circuits, on motor parameters is reduced, and the space of a rotor punching is used fully for placing permanent magnets as many as possible. Moreover, the capability of resistance to demagnetizing and the overbearing capability of the permanent-magnet servo motor are improved, and the operation performance of the permanent-magnet servo motor is effectively improved.

Description

technical field [0001] The invention relates to the technical field of high-performance permanent magnet servo motor design, in particular to a rotor punching structure of a permanent magnet servo motor with precise position, rotational speed and other control requirements. Background technique [0002] With the rapid development of high-performance permanent magnet material manufacturing technology, power electronic control technology, and microelectronic device development technology, as well as the continuous deepening of research on vector control theory and direct torque control theory, permanent magnet servo control systems have developed rapidly. As the execution unit of the servo control system, the permanent magnet synchronous motor overcomes a series of limitations brought by the mechanical commutator and brush of the electric excitation DC servo motor, and has the advantages of superior speed regulation performance, simple structure, reliable operation, small size ...

AI Technical Summary

Problems solved by technology

The Chinese patent application number 201210419454.3 provides a built-in permanent magnet motor rotor stamping and a built-in permanent magnet motor rotor. The rotor magnetic circuit structure of this solution can effectively avoid magnetic flux leakage at the magnetic isolation bridge, thus making the same The air-gap magnetic field intensity generated by the amount of permanent magnets is greater, which reduces the manufacturing cost, but its magnetic circuit structure still cannot solve the problem of sinusoidal back electromotive force of the no-load phase, especially the quadrature-axis armature reaction magnetic field to the direct-axis magnetic field. The influence of the road is not considered, which will reduce the operating performance of the motor at high speed

The Chinese patent application number 201220079850.1 provides a permanent magnet assisted synchronous reluctance motor. The rotor magnetic circuit structure of this scheme is provided with multi-layer permanent magnet slots and multi-layer magnets, which can make full use of the reluctance torque, but for the air gap The magnetic density is not optimized, and the structure of the rotor punch is round, so that the back electromotive force waveform will not be a standard sine wave, which is not conducive to the effective control of the sine wave drive controller

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