Title:
DRIVE SYSTEM FOR ALTERNATING-CURRENT ELECTRIC MOTOR, AND POWER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/162579
Kind Code:
A1
Abstract:
Proposed is a highly versatile drive apparatus capable of supporting various electric motors regardless of the characteristics of the structure, the materials used, or the like of an alternating-current electric motor, as a method for achieving stable drive from a stop or a low speed level without using the rotor position sensor of the alternating-current electric motor. The present invention is provided with a circuit for detecting a hypothetical neutral point potential of the alternating-current electric motor, and a circuit for generating a reference voltage that differs from the potential, and by increasing the differential between the two circuits, a striking voltage is obtained due to the variation in the position of the rotor, and on the basis of this striking voltage, the energizing phase of the alternating-current electric motor is switched, whereby the alternating-current electric motor can be stably driven at a constant speed. The striking voltage value varies according to the type and specification of the motor, but these can be generally supported by adjusting the gain of the amplifier.
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Inventors:
IWAJI YOSHITAKA (JP)
TAKAHATA RYOICHI (JP)
SUZUKI TAKAHIRO (JP)
TAKAHATA RYOICHI (JP)
SUZUKI TAKAHIRO (JP)
Application Number:
PCT/JP2013/060420
Publication Date:
October 09, 2014
Filing Date:
April 05, 2013
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02P6/08; H02P6/16
Domestic Patent References:
| WO2012157039A1 | 2012-11-22 |
Foreign References:
| JP2004096880A | 2004-03-25 | |||
| JPH07245982A | 1995-09-19 | |||
| JPH0993979A | 1997-04-04 | |||
| JP2006067667A | 2006-03-09 | |||
| JP2013055744A | 2013-03-21 |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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