Part 3 examines the operation of a standard dc drive system with speed and current control.] CHOPPER-FED D.C. MOTOR DRIVES If the source of supply is d.c. (for example in a battery vehicle or a rapid ...

When position control is called for, a further outer position loop is added. A two-loop scheme for a thyristor d.c. drive is discussed first, but the essential features are the same in a chopper-fed ...