Title:
VARIABLE-VOLTAGE VARIABLE-FREQUENCY POWER SOURCE
Document Type and Number:
Japanese Patent JPS5886872
Kind Code:
A
Abstract:
PURPOSE:To prevent an electric motor from being burnt by an overcurrent at low speed without any reduction in torque of the motor at low speed, by varying an overcurrent setting signal in accordance with a speed command signal. CONSTITUTION:A function generator 15 into which a speed command signal from a speed setting device is fed is connected to the input side of an overcurrent setting device 7. The function generator 15 receives the speed command signal and dilivers an overcurrent setting signal regulated in consideration of allowable current-time characteristics in accordance with the number of revolutions of an electric motor 5 and so that a current demanded by an ordinary load will sufficiently be supplied. A comparator 8 and an integrator 9 perform a comparison as to the magnetudes between the overcurrent setting signal set by the overcurrent setting device 7 and a motor current feedback signal, and integrate the difference therebetween.
Inventors:
MUKAI KUNIAKI
Application Number:
JP18468181A
Publication Date:
May 24, 1983
Filing Date:
November 18, 1981
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
H02M7/48; (IPC1-7): H02P13/20
Attorney, Agent or Firm:
Kiyoshi Inomata
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