This paper presents a robust direct torque control of an interior
permanent magnet synchronous motor (IPMSM) based on a sliding mode
controller. The sliding mode control (SMC) law is designed in such a
way that the chattering effect is reduced and the problem of reaching
phase stability is eliminated. A space vector modulation is combined with
the SMC to ensure minimum ripple content and high resolution voltage
control. To demonstrate the validity of the proposed scheme, the
calculated motor speed, estimated motor torque, stator flux and stator
current in the presence of iron losses are compared with those measured
in the literature. It is concluded that consideration of iron losses in the
dynamic model of the machine improves the theoretical predictions and
reduces the discrepancies between the calculated and measured values.