Title:
APPARATUS AND METHOD FOR DETECTING SPEED OF INDUCTION MOTOR
Document Type and Number:
Japanese Patent JP3764433
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for detecting and controlling rotating speed of an induction motor that can drive the induction motor without any strains on an inverter even in an abnormal state such as instantaneous power failure and power recovery.
SOLUTION: A speed detecting apparatus of the induction motor comprises a voltage controller 43 that compares the rated current of a motor with current detected from the motor to generate an output voltage, a frequency controller 44 that compares a reference excitation current of the motor with an excitation current detected from the motor to generate an output frequency, and an output frequency selector 64 that compares a frequency due to the output voltage of the voltage controller 43 with the output frequency of the frequency controller 44 to select a final output frequency.
Inventors:
Nasun-ho
Application Number:
JP2003069310A
Publication Date:
April 05, 2006
Filing Date:
March 14, 2003
Export Citation:
Assignee:
LSIS CO.,LTD.
International Classes:
H02P27/06; H02P1/00; H02P3/18; H02P6/06; H02P21/34; H02P23/07; H02P27/08; (IPC1-7): H02P5/41
Domestic Patent References:
| JP2000253505A |
Attorney, Agent or Firm:
Takashi Ishida
Jun Tsuruta
Shimichi Akihisa
Masaya Nishiyama
Higuchi Souji
Jun Tsuruta
Shimichi Akihisa
Masaya Nishiyama
Higuchi Souji