Motor rotor

Abstract

The invention discloses a motor rotor comprising a rotor body, four symmetric permanent magnet blocks are arranged in the rotor body, slide grooves are arranged among the permanent magnet blocks, one side of the rotor body is a spring fixing plate, and centrifugation devices are arranged among neighboring permanent magnet blocks; the centrifugation devices comprise magnetic field shielding blocks, centrifugation blocks, first connecting rods and second connecting rods; the centrifugation blocks are positioned above the slide grooves, one end of each centrifugation block is hinged onto the spring fixing plate via one first connecting rod while the other end of each centrifugation block is hinged onto one magnetic field shielding block via one second connecting rod, and a spring is connected between a middle point of each first connecting rod and the spring fixing plate. In the motor rotor, excessive growth of armature counter electromotive force can be prevented when maximum operation speed of a motor is improved, the connector rods are driven in such a way that the magnetic field shielding blocks move into the gaps among permanent magnets as motor running speed increases and the centrifugation blocks move upward, magnetic leakage flux is increased, effective excitation magnetic flux is lowered, the magnetic field shielding blocks are driven via springs to move away from the permanent magnet blocks when the running speed decreases, the magnetic leakage flux is lowered, and the effective excitation magnetic flux is increased.

Description

technical field [0001] The invention relates to a motor rotor. Background technique [0002] Permanent magnet synchronous motor is a kind of synchronous motor. Its excitation magnetic field is generated by permanent magnets, which eliminates excitation loss. It has the advantages of high power density, high efficiency and wide speed range. It is widely used in high-performance servo and motion control fields. Unlike electric excitation synchronous motors, permanent magnet synchronous motors generate excitation magnetic fields by permanent magnets, so the magnetic field strength is generally constant. According to the basic electromagnetic relationship of the permanent magnet synchronous motor, the rotation back EMF of the motor increases with the increase of the speed. When the motor is running at high speed, the rotation back EMF is close to the power supply voltage, the current regulator is saturated, and the torque output performance of the motor deteriorates sharply, whi...

AI Technical Summary

Problems solved by technology

According to the basic electromagnetic relationship of the permanent magnet synchronous motor, the rotation back EMF of the motor increases with the increase of the speed. When the motor is running at high speed, the rotation back EMF is close to the power supply voltage, the current regulator is saturated, and the torque output performance of the motor deteriorates sharply, which limits the performance of the motor. The speed is further increased

Images