CAPACITOR BRAKING OF SYNCHRONOUS RELUCTANCE MOTORS

Capacitor braking, a well-known low-loss braking method of induction m achines, is described in connection with reluctance machines. To repre sent the main features of capacitor braking of synchronous reluctance motors, three dimensionless quantities are introduced: a frequency par ameter, a reactance parameter and a resistance parameter. With the loa d angle of the synchronous machine added, the result is a four-paramet er description of the braking process. The theoretical values for spee d range and braking torque are compared with the experimental results of a 22 kW 4-pole test machine. Thanks to the large difference between the d-axis and q-axis inductances of the special barrier rotor in the test machine, a sufficiently broad braking speed range can be obtaine d.