BLDC double closed loop (speed PI + current PI) Simulink simulation model

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BLDC Double closed loop simulation ( Speed PI+ electric current PI)

Summary of content ：

utilize simulink Set the BLDC Double closed loop control model , The main features of the model are ：

1. Both speed loop and current loop adopt PI controller ; 

2. Speed loop and current loop PI All controllers have anti integral saturation function ; 

3. The current loop contains back EMF feedforward control ; 

4. The driving form is H_PWM-L_ON; 

5. Current and speed feedback try to use different control cycles ;

Usually in automobile engine / The transmission / Oil pump used in electric drive system 、 Brushless DC motor driven by single resistance square wave is used for water pump, electric tool or fan in heat dissipation equipment (BLDC). chart 1 This is the driving block diagram of this kind of motor .

  chart 1 BLDC Motor drive block diagram

And PMSM The control of the motor is similar to , Brushless DC motor is often used as shown in the figure 2 The double closed-loop control method shown . The hall sensor on the motor collects the rotor position , The actual speed of the motor can be given , The actual speed is fed back to the speed loop , After comparing with the target speed, input to PI controller . chart 1 The middle and lower part is black shunt The sampling resistor feeds back the collected actual current to the current loop , After comparing with the reference current output by the speed loop , Error input to current loop PI controller . The output of the current loop is used as the reference voltage , combination HALL The signal realizes speed regulation and commutation .

chart 2 BLDC Double closed loop control block diagram

There are two common ways of double closed-loop control of Brushless DC motor , The first is that both speed loop and current loop adopt PI controller , The second is the speed loop PI The current loop of the controller adopts hysteresis comparison . This article introduces the first way , This is also a control method that is widely used in practical projects .

chart 3 yes BLDC Preview of double closed loop simulation model . The model is divided into 8 part , Due to the model from simulink It's not clear after the middle screenshot , We will introduce them one by one later .

chart 3 BLDC Overview of double closed loop model

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