Sensorless direct-current brushless motor controller and control method thereof
A brushless DC motor and sensor technology, applied in the direction of electronic commutation motor control, single motor speed/torque control, control system, etc., can solve the problem of short service life of the whole machine, low output power efficiency, poor use of motor materials, etc. problems, to achieve the effect of low cost, stable and reliable performance, and strong anti-interference ability
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[0036] Figure 1 to Figure 5 Shown is a position sensor-based DC brushless motor controller, which includes a power supply circuit, an MCU inverter control drive circuit, and a sensorless detection circuit; the power supply circuit supplies power to the MCU inverter control drive circuit , And drive the DC brushless motor to work through the MCU inverter control drive circuit; the sensorless detection circuit detects the working voltage and working current of the DC brushless motor, and sends the detection result to the MCU inverter control drive circuit, the MCU inverter control drive circuit determines the back-EMF zero-crossing point according to the position detection midpoint method combined with the ADC sampling method, and then delays the rotor 30° electrical angle to determine the commutation time of the motor, Drive the DC brushless motor to slowly accelerate until reaching a predetermined speed.
[0037] The design idea is as follows: because the position detection mid...
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