来源：http://www.jnmcd.com 发布时间：2019-01-24 浏览：次
At this stage, many manufacturers of automation equipment are concerned about brushless DC motors. They like to use brushless DC motors to replace the previous low efficiency, high noise and many other invincible defects, such as three-phase asynchronous motor, stepper motor and so on.
But they are consulting Fujita Motor Company about the parameters and technical problems of brushless DC motors. Can they mention that brushless DC motors do not need drivers? In fact, brushless DC motor can not be unnecessary driver. This is decided from the principle of brushless motor.
Brushless DC motor (BLDC) replaces mechanical commutator with electronic commutator. Because of electronic commutation, drive circuit is needed in BLDC. The commutation circuit of brushless DC motor is composed of drive and control parts, which are not easy to separate, especially the low power circuit often integrates them into a single ASIC.
In the brushless DC motor with high power, the driving circuit and the control circuit can be integrated separately. The drive circuit outputs electric power, drives the armature winding of the motor, and is controlled by the control circuit. The driving circuit has changed from linear amplification state to switching state of pulse width modulation, and the corresponding circuit composition has also changed from transistor discrete circuit to modular integrated circuit.
Modular integrated circuits include power bipolar transistors, power field effect transistors and isolation gate field effect bipolar transistors. Although the isolation gate field effect bipolar transistor is expensive, it is still suitable for its reliable safety and function.
Driving methods of brushless DC motors can be divided into several driving methods according to different categories, each of which has its own characteristics. According to the driving waveform: square wave drive, this driving method is convenient to complete, easy to complete sensorless motor control.
正弦驱动，这种驱动方法能够改善电机运转作用，使输出力矩均匀，但完成过程相对复杂。一起，这种方法又有SPWM 和 SVPWM(空间矢量PWM)两种方法，SVPWM的作用好于SPWM。
Sinusoidal drive, which can improve the motor operation and make the output torque uniform, but the completion process is relatively complex. Together, this method has two methods: SPWM and SVPWM (Space Vector PWM). SVPWM is better than SPWM.
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