What are the main classifications of DC motors?

Update:03 May 2021
Summary:

DC generator A DC generator is a machine that converts […]

DC generator

A DC generator is a machine that converts mechanical energy into DC electrical energy. It is mainly used as the DC motor required for DC motor, electrolysis, electroplating, electric smelting, charging and excitation power supply of AC generator. Although in places where DC power is needed, power rectifier components are also used to convert AC power into DC power, but from some aspects of performance, AC rectifier power can not completely replace DC generators.

DC motor

A rotating device that converts DC electrical energy into mechanical energy. The stator of the motor provides the magnetic field, the DC power supply provides current to the windings of the rotor, and the commutator keeps the direction of the torque generated by the rotor current and the magnetic field unchanged. DC motors can be divided into two categories according to whether they are equipped with commonly used brush-commutators, including brushed DC motors and brushless DC motors.

Brushless DC motors are developed in recent years with the development of microprocessor technology and the application of new power electronic devices with high switching frequency and low power consumption, as well as the optimization of control methods and the emergence of low-cost, high-level permanent magnet materials. A new type of DC motor developed.

The brushless DC motor not only maintains the good speed regulation performance of the traditional DC motor, but also has the advantages of no sliding contact and commutation sparks, high reliability, long service life and low noise. Therefore, it is used in aerospace, CNC machine tools, robots, and electric vehicles. , Computer peripherals and household appliances have been widely used.

According to the different power supply methods, brushless DC motors can be divided into two categories: square wave brushless DC motors, whose back EMF waveform and power supply current waveform are both rectangular waves, also known as rectangular wave permanent magnet synchronous motors; sine wave without For brushed DC motors, the back-EMF waveform and power supply current waveform are both sine waves.