analog brushless motor controller and PWM control of dc brushless motor controller comes into being with the digital control technology and developed, therefore, analog and digital control PWM is the main control method of brushless dc motor controller. These controls are by electronic components integrated controller of brushless dc motor controller, mainly to complete the following aspects of brushless dc motor controller's control. (1)Speed control: brushless dc motor speed control principle of the controller and common dc motor controller, can through the PWM method to control the voltage of power supply, realize the speed control. Using PWM mouth MCU and DSP can be automatically output PWM, make it very easy to find the speed control. (2)Commutation control: with position sensor (Hall sensor)The brushless dc motor controller, according to the position sensor (Hall sensor)Signal is regular reversing, correctly realize the phase current switch; For sensorless brushless dc motor controller, according to the induced electromotive force signal to calculate the reversing point, determine which phase should be electricity, which phase should be without electricity. (3)Reversing control: as long as the change in the current sequence can be achieved and reversing control of brushless dc motor controller. With analog and PWM, the brushless dc motor controller in cancelled after physical carbon brush can make brushless dc motor controller in a more stable, more durable way to run, also enlarged the application range of the brushless dc motor controller, can be used for automatic production areas.
