Synchronous motor system employing a non-synchronous motor for e

Details Synchronous motor system employing a non-synchronous motor for e Synchronous motor system employing a non-synchronous motor for e

1993-03-30

1995-06-20

Ip, Paul

Electricity: motive power systems

With particular motor-driven load device

Power- or motion-transmitting mechanism

318 40, 318 51, F16K 3104

Patent

active

054263530

ABSTRACT:
A rotary actuator derives its power from a synchronous motor preferably of the AC type providing constant output speed, and from a non-synchronous motor, preferably of the DC type, in a helper capacity to provide additional torque for a load. Use of certain types of non-synchronous motors to provide a portion of the maximum torque is cheaper than using a synchronous motor whose size is adequate for the maximum torque requirement. A torque limiting clutch which couples the non-synchronous motor output to the synchronous motor output allows the non-synchronous motor to run compatibly with the synchronous motor. A hysteresis coupling type of torque limiting clutch is preferred. In a preferred embodiment, both of the motors drive a gear train, with the non-synchronous motor coupled to the gear train by the torque limiting clutch.

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NTIS Tech. Notes, Roger Ratliff, Dec. 1991, p. 947.

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