IPMSM Field Oriented Control (FOC) with SVPWM

This motor drive model integrates Field-Oriented Control (FOC) and Space Vector PWM (SVPWM) techniques to control IPMSM.

Speed Control Loop: The reference speed (n_ref) is compared with the actual motor speed. The resulting error is processed through a PI controller to generate the reference q-axis current (I_q). This current determines the torque produced by the motor.

Current Control Loop: There are two separate PI current controllers for the d and q axes. The current references (Id_ref) and Iq_ref) are compared with the motor currents (Id and Iq) obtained from the Park transformation to generate the reference voltage signals (Vd_ref and Vq_ref).

Inverse Park Transformation: It transforms the d-q components in a rotating reference frame into two-phase orthogonal components in the stationary alpha-beta reference frame [1]. During this transformation process, the electrical position angle obtained from the rotor is taken as a reference.

Space Vector PWM: It takes the two-phase reference voltages and generates the optimum switching signals to trigger the 3-phase inverter.

3-Phase Inverter & PMSM Motor: It utilizes the DC voltage to generate the 3-phase alternating currents supplied to the motor windings and drives the motor.

Feedback Path:

• Clarke Transformation: It transforms the 3-phase currents measured from the motor into two-phase stationary axis currents [2,3].
• Park Transformation: It is a mathematical transformation developed to represent the current components, expressed in the two-phase orthogonal plane, in the rotating plane (rotor reference frame, d-q) [2,3]. Thanks to this transformation, variable alternating currents are converted into direct current (DC) signals that can be easily processed by the current controllers (PI).
• Position and Speed Sensing: It processes the data received from the motor sensors to calculate the speed and position information.