B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/29
B66B 1/32 (2006.01) B66B 1/28 (2006.01) B66B 5/02 (2006.01) H02P 3/18 (2006.01)
Patent
CA 1215185
ABSTRACT OF THE DISCLOSURE A variable-voltage variable-frequency elevator control apparatus includes a circuit for consuming regenerated power produced during regenerative braking provided on the DC side of the apparatus rather than on the AC side. During regenerative braking with an emergency generating unit in operation, regenera- ted power is consumed by the consumption circuit on the DC side of the circuit and is prevented from being returned to the emer- gency generating unit. This prevents the production of voltage notches commonly produced during regenerative braking by thyris- tor commutation in conventional circuits. Because no voltage notches are produced, a reduction in the size of the emergency generating unit can be achieved. In addition, since it consumes DC power rather than 3-phase AC power, the consumption circuit requires fewer elements than in conventional control apparatus.
447526
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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