ABSTRACT
Technology relating to variable speed permanent magnet synchronous motor drives is a mature one. Applications of such drives range from few watt rating motor to 1.1. MW 230 rpm ship propulsion system [1]. In the range of a few kW rating, these drives are used for position control and for a wide range of speed control down to 0.1 revolution per hour [2], while having the highest efficiency and a large torque/volume ratio among high performance drives. These drives are generally fed through voltage source PWM inverters. Often indirect dq vector current and vector voltage control are applied to PM synchronous machines. Practical configurations of such controls are discussed in this chapter. Direct vector control, with stator flux estimation, is applied to torque vector control (JVC), Recall from earlier chapters that TVC is a kind of stator flux and torque hysteresis control performed through the direct triggering of one (or a combination of) discrete voltage vector(s) available in the PWM voltage source inverter
7.2 Indirect Vector dq Current Control
Indirect vector dq current control is usually applied to interior PM synchronous motor
drives, and is less commonly used for surface PM synchronous drives [2]. These latter types of machines have modified stator windings. In the following, we first consider the interior PM rotor machine.
