Control system for regulating the speed of an electric motor inc

Details Control system for regulating the speed of an electric motor inc Control system for regulating the speed of an electric motor inc

1976-06-22

1978-03-07

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

H02P 540

Patent

active

040781909

ABSTRACT:
A control system for regulating the torque and speed of an alternating current wound rotor motor used in the traverse drive of an overhead travelling crane comprises an SCR bank controlled by a firing circuit responsive to actuation of an operator-controlled induction master control. The control system further comprises means for deriving a torque signal indicative of instantaneous rotor torque, means for deriving a speed signal indicative of instantaneous rotor speed, and summing means for combining the torque signal, the speed signal, and a reference signal from the induction master control to provide an error signal which is used to operate the firing circuit to thereby control the power delivered by the SCR bank to the motor and insure that motor torque is constant for the speed selected. The means for deriving the speed signal measures the instantaneous frequency of the instantaneous current flow in the rotor (secondary).

REFERENCES:
patent: 3719873 (1973-03-01), Graf
patent: 3753064 (1973-08-01), Agarwal et al.

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