Title:
CONTROLLER FOR INDUCTION MACHINE
Document Type and Number:
Japanese Patent JP3185604
Kind Code:
B2
Abstract:
PURPOSE: To output sufficient torque even in the case of regenerative operation by correcting a frequency command on the output of a regenerative discriminating part.
CONSTITUTION: The input of a controller into an integrator 11 is not command angular frequency ω, but the second command frequency ω' which is the output of a frequency correction part 10 for correcting the command angular frequency ω. The frequency correction part 10 consists of a regenerative discriminating part 6 for detecting, from the command angular frequency ω and torque correct Iq, that an induction machine is in a regenerative state, a correction quantity output part 7 for outputting the correcting quantity proportional to the torque current Iq, a switching device 9 for outputting the output of the correction quantity output part 7 only in the case of regenerative operation on the output of the regenerative discriminating part 6, and a subtracter 8 for subtracting the output of the switching device 9 from the command angular frequency ω. When the induction machine is in a regenerative state, the quantity obtained by subtracting the correction quantity proportional to the torque current Iq from the command angular frequency ω is inputted into the integrator 11. It is thus possible to output sufficient torque even in the case of regenerative operation.
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Inventors:
Seiji Ishida
Toshiaki Okuyama
Kazuaki Tobari
Takanori Ohashi
Hiroyuki Tomita
Hiroshi Fujii
Toshiaki Okuyama
Kazuaki Tobari
Takanori Ohashi
Hiroyuki Tomita
Hiroshi Fujii
Application Number:
JP12109295A
Publication Date:
July 11, 2001
Filing Date:
May 19, 1995
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H02P21/00; H02P21/18; H02P21/22; H02P21/24; H02P23/07; H02P27/04; H02P27/06; (IPC1-7): H02P21/00; H02P5/41
Domestic Patent References:
| JP568398A |
Attorney, Agent or Firm:
Yasuo Sakuta