--%> --%>

Field Oriented Control of an IPM

Motors and generators with MotorSolve

Field oriented control of an interior permanent magnet machine is presented in this example. A 70 KW IPM designed using MotorSolve BLDC is used as an example here. Presented are a summary of the motor characteristics, the PI control scheme, the integrated system that includes the motor model for SIMULINK® (from The Mathworks, Inc®) and results of some test simulations for controlling the speed of the motor.

Cross section 70 KW 8 pole 48 slot IPM

METHODS and RESULTS

SPEED TORQUE CURVE of the IPM Motor

A 70 KW IPM is used in this example that was designed using MotorSolve BLDC. The speed-torque characteristics of the motor is given here.

View larger image

CREATING a SIMULINK RSM of the MOTOR

A finite element analysis based equivalent model of the IPM is generated using MotorSolve. The model interface, including its' scaling properties are shown here.

View larger image

PI CONTROLLER

A simple PI control scheme is used to control the motor dynamics. The Simulink model of this controller, which generates the desired voltages in d and q space is shown in this figure.

View larger image

COMPLETE SYSTEM BLOCK

The complete model is integrated where the input voltages to the model block shown here are computed using space vector pulse width modulation. The input and output pins of the model interface are clearly seen in this figure as well as the appropriate feedback loops.

View larger image

SPEED vs. TIME

Simulation results of the model are presented here in which first shown is the speed vs. time profile which shows that this simple test case of an IPM drive system tracks the desired speed of the motor vary well.

View larger image

TORQUE vs. TIME

Torque vs. time results

View larger image