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BLDC Motor Motor Body

Oemotor Electric Co.,Limited | Updated: Jul 11, 2017

BLDC Motor Motor body

What is brushless motor?

Brushless DC motor by the motor body and drive components, is a typical mechanical and electrical integration products. Brushless motor is no brush and commutator (or collector ring) of the motor, also known as no commutator motor. As early as in the last century when the birth of the motor, the practical motor is a brushless form, that is, the exchange of squirrel cage asynchronous motor, this motor has been widely used. However, the asynchronous motor has many insurmountable defects, so that the development of motor technology is slow. The transistor was born in the middle of this century, so the use of transistor commutation circuit instead of brush and commutator DC brushless motor came into being. This new brushless motor is called an electronic commutation DC motor, which overcomes the flaws of the first generation of brushless motors.

The characteristics of brushless motor

1, can replace the DC motor speed, inverter + inverter motor speed, asynchronous motor + reducer speed;

2, with the advantages of traditional DC motor, while eliminating the carbon brush, slip ring structure;

3, there are brakes, double turn function;

4, small size, light weight, the output of large;

5, excellent torque characteristics, medium and low torque performance, start torque, start the current is small;

6, stepless speed regulation, wide speed range, overload capacity;

7, soft start soft stop, good braking characteristics, can save the original mechanical brake or electromagnetic brake device;

8, high efficiency, the motor itself does not have the excitation loss and the carbon brush loss, eliminates the multi-level deceleration loss, the comprehensive energy saving rate can reach 20% ~ 60%.

9, high reliability, good stability, strong adaptability, maintenance and maintenance simple;

10, resistant to bumpy vibration, low noise, small vibration, smooth operation, long life;

11, does not produce sparks, especially for explosive places, explosion-proof;

12, according to the need for optional trapezoidal wave field motor and sine wave magnetic field motor.

Brushless motor advantage

Different from brushless DC motor, brushless DC motor does not use the mechanical brush device, the use of square wave automatic permanent magnet synchronous motor to Hall sensor instead of carbon brush commutator to NdFeB as the rotor of the permanent magnet material , Compared with the performance of the traditional DC motor has a great advantage, is the best speed motor today. Its advantages:

High efficiency, low power consumption, low noise, long life, high reliability, servo control, stepless frequency control, relatively low cost and easy to use.

Brushless DC motor stator windings made of three symmetrical star connection, with three-phase asynchronous motor is very similar. The rotor of the motor is glued to the magnetized permanent magnet. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver is composed of power electronic devices and integrated circuits. The function is to accept the start, stop and brake signals of the motor to control the start, stop and braking of the motor. The position sensor signal and the forward and reverse signals are used to control the reverse Variable speed command and speed feedback signal, used to control and adjust the speed; to provide protection and display, and so on.

DC brushless motors are widely used in household appliances, auto parts, power tools, office automation, industrial and commercial equipment, medical equipment, personal care, robots and many other industries.


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