Rotor structure of variable excitation permanent magnet synchronous motor

Abstract

The invention discloses a variable excitation permanent magnet synchronous motor rotor structure, belonging to a motor rotor. In the present invention, slots are evenly opened in the middle of adjacent permanent magnets in the rotor along the radial direction of the rotor, and several sets of field-weakening adjustment mechanisms are installed around the rotor; The soft iron block slides radially, a spring is installed between the rotor and the soft iron block, and a connecting rod counterweight mechanism is installed corresponding to each soft iron block; the link counterweight mechanism includes a bracket integrated with the rotor, and is installed on the bracket A connecting rod, the connecting rod is installed on the rotor through the bracket and can swing around the bracket; a counterweight is installed at one end of the connecting rod, and a roller is installed at the other end, and the connecting rod leans against the soft iron block through the roller. Advantages: At low speed, the effective excitation magnetic field is strong, which ensures the torque output capability at low speed; at high speed, the effective excitation magnetic field is weakened, which improves the maximum operating speed of the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to a motor rotor, in particular to a variable excitation permanent magnet synchronous motor rotor structure, [0002] The excitation intensity can be automatically adjusted according to the rotational speed. Background technique [0003] 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. [0004] 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 ...

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