Title:
ELEVATOR DEVICE
Document Type and Number:
Japanese Patent JPS58152774
Kind Code:
A
Abstract:
An elevator system including an elevator car and a drive machine having a DC drive motor, a dual converter, and a phase controller for providing gate drive signals for the dual converter. A reference signal relates to the desired motor armature current is developed in response to the operation of the elevator system. The reference signal indicates when the current source should be switched from one converter bank to the other converter bank. The switching is accomplished by a method which includes retarding the firing angle of the gate drive signals applied to the operative converter, until current is extinguished, applying the gate drive signals to the other converter bank, and advancing the firing angle towards rectification to initiate current flow in the on-coming converter. The rate at which the firing angle is advanced towards rectification is a function of the control signal.
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Inventors:
ARAN RUISU HATSUSAN
BURADEIMAA UHEREKU
BURADEIMAA UHEREKU
Application Number:
JP2547583A
Publication Date:
September 10, 1983
Filing Date:
February 17, 1983
Export Citation:
Assignee:
WESTINGHOUSE ELECTRIC CORP
International Classes:
B66B1/24; B66B1/30; B66B1/34; H02P7/292; (IPC1-7): B66B1/06; B66B1/28; H02P5/16
Domestic Patent References:
| JPS5323454A | 1978-03-03 |
Attorney, Agent or Firm:
Koichiro Kato