Title:
SYNCHRONOUS MOTOR DRIVE APPARATUS
Document Type and Number:
WIPO Patent Application WO/2013/094360
Kind Code:
A1
Abstract:
A converter circuit (2) converts an inputted alternating current power (1) to a direct current voltage (Vdc), and an inverter circuit (3) converts the direct current voltage (Vdc) to a three-phase alternating current and drives a synchronous motor (4). A microcomputer (A1) calculates an active power (P) of the synchronous motor on the basis of a power source current (Idc) of the inverter circuit, and estimates an effective current value (Iac) of the inputted alternating current power on the basis of: an effective voltage value (Vac) of the inputted alternating current power, calculated on the basis of a previously measured relationship between the direct current voltage and the active power of the synchronous motor; the active power (P) of the synchronous motor; and the power factor (cos(θ)) of the inputted alternating current power.
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Inventors:
YOSHIDA MICHIHO
Application Number:
PCT/JP2012/080272
Publication Date:
June 27, 2013
Filing Date:
November 22, 2012
Export Citation:
Assignee:
SHARP KK (JP)
YOSHIDA MICHIHO
YOSHIDA MICHIHO
International Classes:
H02P27/06; H02P5/74
Foreign References:
| JP2004343823A | 2004-12-02 | |||
| JPH0791715A | 1995-04-04 | |||
| JP2000337686A | 2000-12-08 |
Attorney, Agent or Firm:
Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)
Patent business corporation Fukami patent firm (JP)
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