Title:
OPERATING APPARATUS FOR DC MOTOR
Document Type and Number:
Japanese Patent JPS5688691
Kind Code:
A
Abstract:
PURPOSE:To reduce the power consumption in a blower in a thyristor Ward- Leonard system having the cooling blower by changing the operating point of the cooling blower depending on whether a DC machine is in a high speed region or in a low speed region, with a driving motor for the cooling blower as an induction motor wherein the number of poles is changed. CONSTITUTION:The thyristor Ward-Leonard system is cooled by the cooling blower 11. In the case the speed of the DC motor 5 is changed from 100% to less than alpha%, the alpha% speed is previously set in a speed setter 13, and the signal of a speed sensor 6 is compared with said speed in a comparator 14. If the speed of the DC motor 5 is less than alpha% speed, the relay output signal is sent to a control center 16 by driving a relay driver 15, and the operation is performed by changing the induction motor 12, wherein the number of poles is changed and which drives the the cooling blower 11, from the high speed to the low speed.
Inventors:
OGAWA IKUO
Application Number:
JP16479579A
Publication Date:
July 18, 1981
Filing Date:
December 20, 1979
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
H02P7/292; H02P5/46; H02P7/28; (IPC1-7): H02P5/46