Title:
DETECTING METHOD FOR TORQUE OF THREE-PHASE AC INDUCTION MOTOR DRIVEN BY INVERTER DEVICE
Document Type and Number:
Japanese Patent JP2685686
Kind Code:
B2
Abstract:
PURPOSE: To detect the torque of AC motor driven by an universal inverter without using a rotating speed sensor or a special microprocessor.
CONSTITUTION: A microprocessor 1 for controlling an inverter 30 outputs signals corresponding to inverter voltage V, angular velocity 2π f and phase angle ω d t to torque detection means 20. On the other hand, and the current of each phase of an AC motor 40 is detected by CT given to torque detection means 20. The torque detection means 20 calculates the torque of an AC motor 40 by the following equation: τ=K(V/ω) [Iasin {ωt-(1/6)π-Ibcos} (ωt)] Torque of calculated AC motor 40 is displayed on an indicator or used for overload prevention for the AC motor 40.
Inventors:
Akio Yanagida
Application Number:
JP10986892A
Publication Date:
December 03, 1997
Filing Date:
April 28, 1992
Export Citation:
Assignee:
Toyo Denki Manufacturing Co., Ltd.
International Classes:
G01L5/00; H02P21/00; H02P23/07; H02P27/04; H02P27/06; (IPC1-7): H02P21/00; G01L5/00
Other References:
【文献】「インバーダ しくみと使い方のこつ」、常広譲・松本圭二著、電気書院、1989年
【文献】「ACサーボシステムの理論と設計の実際-基礎からソフトウェアサーボまで-」、杉本英彦・小山正人・玉井伸三著、総合電子出版社、1991年
【文献】「ACサーボシステムの理論と設計の実際-基礎からソフトウェアサーボまで-」、杉本英彦・小山正人・玉井伸三著、総合電子出版社、1991年
Attorney, Agent or Firm:
Shunichiro Nagasawa (1 person outside)
Previous Patent: FOAM INHIBITOR COMPOSITION
Next Patent: PRODUCTION OF PARTICLES OF OXIDE OF RARE EARTH ELEMENT
Next Patent: PRODUCTION OF PARTICLES OF OXIDE OF RARE EARTH ELEMENT