Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-06-26
1990-10-09
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, 363 58, H02P 540
Patent
active
049623397
ABSTRACT:
An induction motor torque/flux control system the motor flux is forced down while accelerating and force up while decelerating to maintain a required flux level at all speeds. This is achieved through vector control by generating a direct current component in relation to the flux demand while imposing limits thereto corresponding to the maximum desirable resultant current vector, and by generating a quadrature current component which is held between limits defined by the sum of the squares of the two current components. The three-phase currents of the motor generated by vector control transformation are used to control a voltage-source inverter in a bang-bang fashion. The conventional bang-bang technique is improved by typing up one pole while controlling in the bang-bang mode the two other poles. To this effect the motor back emf is detected when the poles are simultaneously tied to one of the DC link terminals, and the tied-up pole is selected by the emf so detected.
REFERENCES:
patent: 4139885 (1979-02-01), Overzet et al.
patent: 4675799 (1987-07-01), Suzuki et al.
Lorin C. M.
Smith Jr. David
Westinghouse Electric Corp.
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