How to control the brushless dc motor

by:Hoprio     2020-07-25
For brushless dc motor rotation, the first control department must be based on ( Position sensor) Induction to the position of the rotor of the motor current,
and then according to the stator winding decided to open ( Or close) Inverter in the order of the power transistor,
the current flowing through the motor coil in a sequence downstream ( Or the reverse) A rotating magnetic field, and interact with the rotor magnet,
so can make motor chronological/reverse rotation. When turning to the induction motor rotor position to another set of signals,
control department again to open the next set of power transistor, continue to be in the same direction so motor rotation until control department decide to stop the motor rotor close power transistor ( Or just open the arm power transistor) ;

when the motor spins, control department again according to the speed set by the driver and plus/minus the rate of command with the speed of signal change ratio ( Or by the software operation) Again to decide by the next group ( AH, AH, CL, BL or BH, CL or & hellip; … ) Switch conduction,
and conduction time length. The speed is not enough to open long, speed is too shorter, this part of the work are done by PWM.
is PWM motor speed is fast or slow, how to generate the PWM is the core to achieve more accurate speed control.
the speed of high speed control must consider the system CLOCK ( Time) Resolution is enough to have time on the processing software instructions,
in signal changes in the data access mode also affect the validity, real-time processor performance, and judgement.
as to the speed control, especially in low speed starting of low speed because of return signal changes more slowly,
how to capture the signal mode, timing of treatment, according to the motor characteristics appropriate configuration control parameter value is very important.
or rate of return changes in encoder changes for reference, make the signal resolution increases in order to get better control, the motor can run smoothly and good response.
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