B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/23
B66B 1/28 (2006.01) B66B 1/30 (2006.01) B66B 1/32 (2006.01) H02M 5/458 (2006.01) H02P 23/06 (2006.01)
Patent
CA 1208381
ABSTRACT OF THE DISCLOSURE An apparatus for controlling an A-C powered elevator in which A-C electric power is converted into D-C electric power through a rectifier, the D-C electric power thus converted is converted into a A-C electric power of a variable frequency via an inverter, an A-C electric motor is driven by the thus converted A-C electric power, the A-C motor being controlled by a controller which is connected to a D-C control source, a cage is driven by the thus controlled electric motor, said motor producing regenerated electric power depending upon the operation condition of said cage, wherein provision is made of a regenerated electric power controlling device which is connected between the D-C side of the inverter and the controller in order to supply the regenerated electric power to the controller. When the voltage on the D-C side of the inverter becomes greater than a predetermined reference value, a switching element is rendered conductive, and the regenerated electric power is supplied to the controller. Therefore, a power regenerating inverter need not be independently provided, and the apparatus can be cheaply constructed. Further, since the electric power is not wastefully consumed, energy can be saved.
423084
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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