A rotor core structure of electric excitation brushless DC motor

Abstract

The present invention provides an electro-magnetic brushless direct current motor rotor core structure. The excitation of a brushless direct current motor can regulate the size of the output torque and the speed of a motor through regulation of the size of the applied field current so as to output large torque at a low speed and have a high rotation speed. Compared with a traditional brushless direct current motor, the motor has better speed regulation performances and low-speed large torque characteristics so as to save expensive rare earth permanent magnetic steel, substantially reduce the cost, improve the reliability and apply to the places with high temperature. The magnetic field waveform of the brushless direct current motor must be a trapezoid wave, and the width of the upper edge of the magnetic field trapezoid wave reaches 120 electric degrees. When the power of the motor is large, the excitation winding of each pole of the motor is a generally duplex winding in order to improve the heat radiation capability of the rotor, and each pole has four excitation winding slots and can generate magnetic leakage problem between the inner and outer notches. The iron core closed to the notch portion between the inner notch and the outer notch is removed to process a big notch, and the inner and outer notches commonly use a notch to separate a magnetic leakage magnetic circuit, reduce the magnetic leakage, increase the main magnetic flux, improve the motor power and improve the efficiency of the motor.

Description

technical field [0001] The invention relates to a DC motor, in particular to an electric excitation brushless DC motor. Background technique [0002] The electric excitation brushless DC motor can adjust the output torque and speed of the motor by adjusting the magnitude of the external excitation current, so that the external characteristics of the motor meet the load characteristics required by the equipment. It can output large torque at low speed and can Has a higher rotational speed. Compared with the traditional brushless DC motor, this motor has better speed regulation performance and low-speed high-torque characteristics, and saves the expensive rare earth permanent magnet, the cost will be significantly reduced, and the reliability will be improved. , can be applied to places with higher temperature. Electric excitation brushless DC motor has good speed regulation performance, especially suitable for electric vehicles, mixing equipment, injection molding machinery...

AI Technical Summary

Problems solved by technology

The magnetic flux generated by each slot winding is related to its ampere-turns. The generation of magnetic flux leakage reduces the magnetic force lines passing through the two-thirds of the center of the magnetic pole, which affects the effective power of the motor and reduces the efficiency of the motor.

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