Title:
CONTROL DEVICE FOR ALTERNATING CURRENT MOTOR
Document Type and Number:
WIPO Patent Application WO/2014/128947
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for detecting current differential values with high accuracy, to accomplish position-sensorless control of an alternating current motor. The control device for an alternating current motor is provided with: a current detection circuit that detects the value of an alternating current; an integration circuit to which the alternating current detected by the current detection circuit is inputted; and a motor voltage calculation circuit. The integration circuit calculates as the integral input value representing the differential between the alternating current voltage detected by the current detection circuit and the integral output value of the integration circuit, and the motor voltage calculating circuit calculates the voltage phase of an inverter, doing so on the basis of the integral input value and the integral output value.
Inventors:
SUMITA SATOSHI (JP)
IWAJI YOSHITAKA (JP)
IWAJI YOSHITAKA (JP)
Application Number:
PCT/JP2013/054654
Publication Date:
August 28, 2014
Filing Date:
February 25, 2013
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02P27/06
Foreign References:
| JP2005328635A | 2005-11-24 | |||
| JPH06104659A | 1994-04-15 |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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