Title:
THREE-PHASE SYNCHRONOUS MOTOR DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/153657
Kind Code:
A1
Abstract:
A three-phase synchronous motor drive device is provided with: a three-phase inverter (3) having switching elements for three phases and for driving a motor (4) functioning as a three-phase synchronous motor; a controller (2) functioning as a control unit which selects four switch states from multiple switch states representing the on and off state of the switching elements for three phases and which sequentially controls the three-phase inverter in the four switch states; and a neutral potential amplifier (13) functioning as a neutral potential detection unit which detects the neutral potential (Vn0) of the stator windings (Lu, Lv, Lw) of the motor (4) in each of the four switch states. The present invention estimates the rotor position of the three-phase synchronous motor within the range of one cycle period of an electric angle on the basis of at least three of the four neutral potentials detected in the four switch states.
Inventors:
IWAJI YOSHITAKA (JP)
TAKAHATA RYOICHI (JP)
SUZUKI TAKAHIRO (JP)
TAKAHATA RYOICHI (JP)
SUZUKI TAKAHIRO (JP)
Application Number:
PCT/JP2012/060040
Publication Date:
October 17, 2013
Filing Date:
April 12, 2012
Export Citation:
Assignee:
HITACHI LTD (JP)
IWAJI YOSHITAKA (JP)
TAKAHATA RYOICHI (JP)
SUZUKI TAKAHIRO (JP)
IWAJI YOSHITAKA (JP)
TAKAHATA RYOICHI (JP)
SUZUKI TAKAHIRO (JP)
International Classes:
H02P6/18
Foreign References:
| JP2010074898A | 2010-04-02 | |||
| JP2001251889A | 2001-09-14 | |||
| JP2005537774A | 2005-12-08 |
Attorney, Agent or Firm:
NAGAI, Fuyuki (JP)
Fuyuki Nagai (JP)
Fuyuki Nagai (JP)
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