Single-Phase Asynchronous Machine Direct Torque Control

This example shows how to control the rotor speed in a single-phase asynchronous machine (ASM) based electrical drive using direct torque control. An ideal torque source provides the load. The Control subsystem uses a cascade control structure. An outer PI-based speed control loop provides the torque and flux references to the direct torque control algorithm from the inner loop. The single-phase ASM is fed by an H bridge. The Scopes subsystem contains scopes that allow you to see the simulation results.

Model

Simulation Results from Simscape Logging

The plot below shows the requested and measured speed for the test, as well as the stator currents in the electric drive.

The plot below shows the requested and measured torque for the test, as well as the requested and estimated flux in the electric drive.

Results from Real-Time Simulation

This example has been tested on these platforms:

• Speedgoat™ Performance real-time target machine with an Intel® 3.5 GHz i7 multi-core CPU and 4 GB RAM.

• dSPACE® SCALEXIO LabBox with Intel® Core XEON E3-1275v3 at 3.5GHz and 4 GB RAM.

You can run this model in real time with a step size of 20 microseconds by using the Simscape local solver. For small sample rates, a task overrun might occur during the initial task execution due to a cold cache. To avoid this overrun, if the selected platform supports these options, relax the start-up behavior by specifying a limited number of task overruns or increasing the sample time of periodic tasks during the start-up phase of the real-time application.