Title:
誘導電動機の制御装置
Document Type and Number:
Japanese Patent JP6697678
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a control apparatus of an induction motor, capable of estimating a rotational speed of a free-run state at a high precisely.SOLUTION: A control apparatus of an induction motor, comprises: an inverter 20; a current detection means 40; a current adjustment means 50; a magnetic flux differential value computing means 90 for calculating a differential value of a secondary magnetic flux q-axial component; an inclination operation means 120 for operating an inclination of the differential value of the secondary magnetic flux q-axial component for a constant period from a start of flowing a DC current at a free run; a mean value operation means 140 for calculating an inclination mean value; and an initial speed operation means 160 for operating a first speed estimation value from the inclination mean value, calculates a first angle by multiplying a first time and the speed estimation value from the start of flowing to the start of the means operation, operates a second angle by multiplying a second time and the speed estimation value up to the end of the means operation, and operates an initial speed estimation value ωby correcting the speed estimation value by a compensation coefficient obtained by dividing a difference of the second angle and the first angel with a difference of a sin component of the second angle and a sin component of the first angle.SELECTED DRAWING: Figure 1
Inventors:
Kikuchi Hisae
Application Number:
JP2016140228A
Publication Date:
May 27, 2020
Filing Date:
July 15, 2016
Export Citation:
Assignee:
Fuji Electric Co., Ltd.
International Classes:
H02P21/26; H02P1/26; H02P21/34
Domestic Patent References:
| JP6225888A | ||||
| JP20076664A |
Foreign References:
| US6242885 |
Attorney, Agent or Firm:
Yuichi Morita