Creating Plant Model Using Motor Control Blockset

An accurate plant model is a vital part of motor control system development. After creating an accurate plant model, you can verify the functionality of the control system, conduct closed-loop model-in-the-loop tests, tune the controller gains using simulation, and optimize the algorithm before you deploy the model in the actual plant.

When you create a plant model using Motor Control Blockset™, you model these components to simulate the functional behavior in a simulation environment:

• Permanent Magnet Synchronous Motor (PMSM)

• Average-value Inverter

• Sensors and signal conditioning circuits

• Processor peripherals: Analog-to-Digital converter (ADC) and Pulse-width-modulator (PWM)

You can verify the functionality of the plant model you create by:

1. Reading the normalized PWM duty cycle from the control algorithm.

2. Simulating the motor for the connected load.

3. Obtaining the output motor phase current (in terms of ADC counts) and the output motor position (in terms of encoder pulse counts) from the simulation.

The workflow to create a plant model involves these steps.

Note

See the plant model in the mcb_pmsm_foc_qep_f28379d.slx model that is used in the example Field-Oriented Control of PMSM Using Quadrature Encoder.

1. Use PMSM Block and Motor Parameters to Design Plant Model

2. Add Average-Value Inverter Block

3. Create Motor Phase Current Sensing and Signal Conditioning Subsystem

4. Create Position Sensing Subsystem

5. Add Delay in Plant Model

6. Integrate Blocks and Subsystems