Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1991-05-22
1993-12-14
Skudy, R.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
318801, 363 37, B66B 128, H02P 5172, H02M 5451
Patent
active
052704980
ABSTRACT:
An elevator speed control apparatus includes an inverter connected to an AC power source so as to supply an induction motor for driving an elevator with a variable-voltage, variable-frequency AC. A contactor provided between the invertor and the AC power source. A magnetic flux computing device computes residual value of secondary magnetic flux of the induction motor while the contactor is closed. A control device divides a primary current of the induction motor into an exciting current component and a torque current component so as to perform vector control, this control device being also used to generate a forcing pattern for the exciting current component in accordance with an output of the magnetic flux computing means when the contactor is closed.
REFERENCES:
patent: 4567419 (1986-01-01), Watanabe
patent: 4624342 (1986-11-01), Tanahashi et al.
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4681191 (1987-07-01), Ikejima
patent: 4749932 (1988-06-01), Yonemoto
Mitsubishi Denki & Kabushiki Kaisha
Nappi Robert
Skudy R.
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