Title:
MONITORING SYSTEM FOR HYSTERESIS MOTOR GROUP
Document Type and Number:
Japanese Patent JPS5893497
Kind Code:
A
Abstract:
PURPOSE:To improve the reliability of monitoring a hysteresis motor by simultaneously detecting the counterelectromotive force generated from the hysteresis motor group. CONSTITUTION:Hysteresis motor groups 4a-4d periodically turn semiconductor an interruptor 3 OFF during operation, the counterelectromotive voltages of the motor groups 4a-4d are simultaneously measured via a measuring transformer 6 during the period, and the frequencies are detected by a frequency detector. When the motor 4d is, for example, defective, if the motor 4d is disconnected by the switch 5d, the remaining motors 4a-4c can be continuously monitored.
Inventors:
YABUTA HITOSHI
MOROKUZU MUNEO
MOROKUZU MUNEO
Application Number:
JP18923081A
Publication Date:
June 03, 1983
Filing Date:
November 27, 1981
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
H02P23/00; H02P5/74; (IPC1-7): H02P7/74
Attorney, Agent or Firm:
Yoshiaki Inomata