Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1986-11-28
1988-03-29
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318808, H02P 318
Patent
active
047346345
ABSTRACT:
When an inverter is disconnected from a rotating motor due to power failure or motor accident, it is necessary to connect the inverter power again to the rotating motor by the inertia force in order to keep the motor rotating. To achieve the above reconnection, the inverter is controlled in accordance with open-loop control method, without use of any motor speed detecting means, thus improving control response speed. In reconnection, the inverter is started at a frequency higher than the rotating motor speed and at a voltage lower than the rated value; when a predetermined time has elapsed after the starting voltage was applied to the motor, only the frequency is decreased; when inverter driving current drops below a predetermined value, the frequency is held and only the voltage is increased until the voltage-to-frequency ratio reaches a predetermined value.
REFERENCES:
patent: 3593103 (1971-07-01), Chandler
patent: 4047083 (1977-09-01), Plunkett
patent: 4409533 (1983-10-01), Kawabata
patent: 4417193 (1983-11-01), Hirata
patent: 4445167 (1984-04-01), Okado
patent: 4451112 (1984-05-01), Hattori et al.
patent: 4456865 (1984-06-01), Robertson, Jr. et al.
Kito Yasutami
Yasukawa Kuniake
Kabushiki Kaisha Meidensha
Smith Jr. David
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