Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-12-30
1991-03-12
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318778, 323906, H02P 128, H02P 130
Patent
active
049995600
ABSTRACT:
An electric motor running system consists of a photovoltaic array, an inverter for inverting output voltage of the photovoltaic array to AC voltage and automatically controlled so that the frequency is changed in accordance with the output voltage of the photovoltaic array, maintaining the ratio of the voltage to the frequency at a constant value, an induction motor operated by application of the AC voltage from the inverter, and a frequency increasing circuit for increasing the output frequency of the inverter instantaneously so that the motor produces the torque larger than the load starting torque when the motor is started and further decreasing the increased output frequency of the inverter to the normal running frequency after the increased output frequency is maintained for a predetermined period of time. This construction allows the motor to be smoothly started even where a load connected to the motor is a positive displacement pump which has a large static friction torque.
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"Microcomputer Control of a Residential Photovoltaic Power Conditioning System", Bimal K. Bose et al., U.S. DEO Report 1984.
Kobayashi Kazuo
Morishima Yoichi
Suzuki Isao
Kabushiki Kaisha Toshiba
Smith Jr. David
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