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A unique form of motor-generator set has been applied as an isolating device in the power system of a space vehicle. The M-G set acts as a buffer, i. e., it isolates electronic circuitry comprising the inertial guidance system from primary power line transients. The set consists of: an extremely low slip polyphase induction motor driving a unique brushless A-C generator; and an integral voltage regulator. This paper describes the rotating machinery portions of a typical set.