Control system for regulating the speed of an electric motor

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

1976-06-22

1978-06-06

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318237, 318231, H02P 126

Patent

active

040938980

ABSTRACT:
A control system for regulating the torque and speed of an alternating current induction 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 ensure that motor torque is constant for the control position selected or speed is controlled up to the torque level selected. The means for deriving the speed signal measure the magnitude of the instantaneous rotor voltage by sampling during a fixed period voltage derived from the supply voltage. The voltage being sampled is the voltage at the slip resistors connected to the motor rotor. Means are provided to combine the speed signal with the torque signal only after motor speed exceeds a desired level.

REFERENCES:
patent: 3586935 (1971-06-01), Lundelius, Sr.
patent: 3593083 (1971-07-01), Blaschke
patent: 3753064 (1973-08-01), Agarwal et al.
patent: 3769564 (1973-10-01), Rettig

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