Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1975-04-14
1977-05-10
Rubinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318230, 318231, H02P 540
Patent
active
040230830
ABSTRACT:
A torque regulating alternating current induction motor control system comprising a motor flux sensing coil arrangement mounted on the induction motor stator for sensing the actual flux produced across the rotor-stator air gap of the motor and deriving a motor flux voltage signal proportional to the actual motor flux. An integrating circuit integrates the voltage signal to obtain a feedback sensed actual motor flux signal representative of the actual air gap flux. An actual torque feedback circuit converts the actual air gap flux and stator current signal to an actual value of torque feedback control signal. A first feedback control loop is responsive to the actual torque feedback control signal and a command value of torque signal and controls the frequency of operation of a power converter supplying the induction motor. A second feedback control loop also responsive to the feedback sensed actual value of flux converts the flux signal into a (V/Hz) voltage control signal for maintaining a substantially controlled value of rotor-stator air gap flux level. The first and second feedback control loops are interconnected and coact to maintain operation of the induction motor at a controlled value of torque.
The actual torque feedback circuit includes a flux signal processing circuit for deriving from the output motor flux signals respective direct and quadrature axes flux signal components and combines these signals with direct and quadrature axes motor current signal components in multiplier circuits for multiplying the quadrature axis flux signal by the direct axis motor current signal and for multipyling the direct axis flux signal by the quadrature axis motor current signal. A summing circuit sums the two products to derive an output actual value of torque developd by the induction motor in accordance with the expression T=K(.psi..sub.d i.sub.qs -.psi..sub.q i.sub.ds). The system is designed primarily for use with a three-phase, variable voltage, variable speed, alternating current induction motor intended for traction motor drives and makes available a new and novel actual torque measuring arrangement for use in such systems.
REFERENCES:
patent: 3500158 (1970-03-01), Landau et al.
patent: 3512067 (1970-05-01), Landau
patent: 3593083 (1971-07-01), Blaschke
patent: 3855509 (1974-12-01), Wright
General Electric Company
Helzer C. W.
Richardson, Jr. A. S.
Rubinson Gene Z.
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