Accession Number : AD0679819

Title :   POWER RELATIONSHIPS IN A CONTACTLESS A-C MACHINE OPERATING AT VARIABLE SPEED,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kyalyan,P. A.

Report Date : 1968

Pagination or Media Count : 18

Abstract : A synchronous-flux machine for generating constant-frequency 3-phase power at variable speed of rotation is analyzed; it includes a special frequency changer for supplying the field-current frequency proportional to the rotor slip. The magnetic flux produced by the field current rotates with respect to the open stator winding at a synchronous speed; a stationary frequency changer supplies the field winding. This machine is theoretically regarded as a cascade of two symmetrical wound-rotor induction machines; its fundamental equations are set up, and formulas for currents, power, and torque under sustained operating conditions are derived. Distribution of the active power depending on the rotor-rpm variation, for S > O, s = O, s < O, is analyzed. It is found that the excitation power is not lost in the machine, but rather is supplied to the line or is taken from the line. It is claimed that the above type of synchronous-flux machine can operate economically as a generator or as a motor.

Descriptors :   (*GENERATORS, ALTERNATING CURRENT), ELECTRIC MOTORS, POWER, FREQUENCY CONVERTERS, MATHEMATICAL ANALYSIS, USSR

Subject Categories : Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE