Title:
DETECTING METHOD FOR MAGNETIC FLUX OF AC MOTOR
Document Type and Number:
Japanese Patent JPS58130793
Kind Code:
A
Abstract:
PURPOSE:To accurately detect a magnetic flux of an AC motor by constructing to allow the output of an integrator or a filter to coincide with the magnetic flux reference signal of a control circuit at the low speed rotating time. CONSTITUTION:The output of an inverter 1 is controlled to be proportional to the current command pattern signal according to the operation of a comparator 13. The output signal of a comparator 18 is applied through a switch circuit 19 and an adder 16 to a magnetic flux detector 17 at the low speed rotating time. In this case, the signal is selected to have a polarity relation controlled to allow the output of the detector 17 to coincide with the magnetic flux reference signal. As a result, the output signal of the detector 17 formed of an integrator allows to coincide with the magnetic flux reference signal by the feedback control. When switched from low speed rotation to high speed rotation, the output signal of the comparator 18 is interrupted by a switch circuit 19, and the detector 17 accordingly integrates the signal from a transformer 15 and outputs a magnetic flux detection signal.
Inventors:
OKUYAMA TOSHIAKI
MIKI KOUJI
MIKI KOUJI
Application Number:
JP1158282A
Publication Date:
August 04, 1983
Filing Date:
January 29, 1982
Export Citation:
Assignee:
HITACHI LTD
HITACHI ENG CO LTD
HITACHI ENG CO LTD
International Classes:
H02P21/00; H02P21/04; H02P21/22; H02P23/03; H02P23/07; H02P23/08; H02P23/16; H02P27/04; H02P27/06; H02P27/08; (IPC1-7): H02P5/34; H02P7/36
Attorney, Agent or Firm:
Akio Takahashi