Brushless motor drive occupies a very important role in industry application, from the terminal, the brief analysis of the basic control methods:
when the motor spins, control department again according to the speed set by the driver and plus/minus the rate of command,命令)With the hall -Sensor signal changing speed 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. PWM is decided to 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 resolution will be enough to have time on the processing software instructions, in addition to the hall -Sensor signal changing data access mode also affect the processor performance, and determine the accuracy and real-time performance. As to the speed control, especially in low speed starting of low speed because of the hall - backSensor signal changes became slower, moped motor, 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 a better control. The motor can run smoothly and the response is good, P. 我。 D。 Control the appropriate or not also can't ignore.
the before mentioned brushless dc motor is a closed loop control, so back to the credit number and told distance target speed control of motor speed now is how much, motor, this is the error (Error)。 Ways there are to know the error compensates nature, traditional engineering control such as P. 我。 D。 Control. But control of the state and the environment is complex and changeable, if you want to control the strong and durable are factors to consider I'm afraid I can not fully grasp the traditional engineering control, fuzzy control, expert system and neural network, so also will be included in become intelligent P. 我。 D。 The important theory of control.
