What is the difference between permanent magnet DC brushless motor and ordinary brushless motor?

First of all, both permanent magnet DC brushless motors and ordinary brushless motors belong to brushless motors, and their biggest difference lies in whether there are permanent magnets.

Permanent magnet brushless DC motor uses permanent magnets to generate magnetic field, so its magnetic field is constant.

This kind of motor usually has higher efficiency and longer service life, and can run smoothly in a wide speed range.

Permanent magnet brushless DC motor is relatively simple to control because of its constant magnetic field. It can be started, stopped and adjusted only by controlling the input current of the motor.

Ordinary brushless motor usually needs to control winding current to generate magnetic field.

The magnetic field of this kind of motor is changeable, and more complex control algorithm is needed to ensure the normal operation of the motor.

Ordinary brushless motor has relatively low efficiency and short service life, but its advantage is that it can run in a wide range of voltage and current, and it is suitable for application scenarios with high power requirements.