A Control Method for Improving the Commutation Accuracy of Brushless DC Motor
A brushed DC motor and control method technology, applied in electronic commutation motor control, control system, torque ripple control and other directions, can solve the problem of motor lead or lag commutation
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0018] A control method for improving the commutation accuracy of a brushless DC motor without a position sensor. By sampling the terminal voltage of the motor to the ground, sending it to a DSP for judgment, and obtaining a commutation signal; in order to improve the commutation accuracy, Take the following steps:
[0019] (1) Reasonably select the DSP sampling method, make the PWM counting mode of the DSP as the increasing and decreasing counting mode, and select AD sampling when the counter is 0, avoiding the PWM switching action time; read the terminal voltage of the motor of the AD port to the ground signal U a , U b , U c , after the conversion formula E a =U a +(U a +U b +U c ) / 3, E b =U b +(U a +U b +U c ) / 3, E c =U c +(U a +U b +U c ) / 3 , get the actual three-phase terminal voltage signal E of the brushless DC motor a , E ...
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