Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1983-03-18
1985-01-01
Truhe, J. V.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
318258, 318741, 318759, 318760, 318761, 318762, B66B 132
Patent
active
044911971
ABSTRACT:
An SCR bridge of an elevator speed control apparatus is connected between an induction motor 5 and two (R, S) of the three-phase power supply terminals. Two diagonally opposite legs of the bridge comprise single SCR's 25, 26, and the other two legs each comprise a pair of parallel, reverse polarity SCR's 21, 22; 23, 24. The third power supply terminal is connected directly to the motor through a single switch contact 8. By appropriately controlling the switch contact and the SCR.varies.s in accordance with the difference between the actual and commanded elevator speeds, the bridge can be configured to implement three phase running during acceleration and constant speed modes, single phase running during a transitional slow down mode, and D.C. braking during a deceleration mode.
REFERENCES:
patent: 3798519 (1974-03-01), Habisohn
patent: 4042069 (1977-08-01), Ohira et al.
patent: 4078189 (1978-03-01), Nash et al.
patent: 4078191 (1978-03-01), Morters et al.
patent: 4093898 (1978-06-01), Morters et al.
patent: 4100469 (1978-07-01), Nelson et al.
patent: 4122919 (1978-10-01), Anzai
patent: 4176306 (1979-11-01), Asano et al.
patent: 4213517 (1980-07-01), Ando
patent: 4307793 (1981-12-01), Caputo
patent: 4319665 (1982-03-01), Komuro et al.
Ip Paul Shik Luen
Mitsubishi Denki & Kabushiki Kaisha
Truhe J. V.
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