Improvements in or relating to the control of alternating current slip ring motors

Abstract

Abstract 807,641. Control of A.C. motors. WEST & CO. Ltd., A., and STACEY, J. R. June 8, 1956 [March 16, 1954], No. 7601/54. Drawings to Specification. Class 38 (3). The subject-matter of this Specification is substantially the same as that described in Specification 807,642 but the claims relate to a control system for a slip-ring motor in which dynamic braking of the motor is effected by injecting direct current into the motor primary circuit, wherein means are provided whereby when increasing the torque of such dynamic braking (say by reducing the resistance in the secondary circuit of the motor), the increase of said torque is subject to a delay which is greater or less according as the deceleration of the motor is less or greater and, therefore, according as an overhauling load is greater or less, so that a runaway condition under the influence of such overhauling load is ensured against, said delay being ended in response to the dropping-out of a relay having its energizing winding connected to the secondary circuit of the motor.

Inventors

No inventors recorded.

Bibliographic Details