Title:
ELECTRIC COMPRESSOR
Document Type and Number:
WIPO Patent Application WO/2007/086257
Kind Code:
A1
Abstract:
An inverter-integrated or an inverter-separated electric compressor has a control device. The control device estimates a compressor suction pressure based on the temperature of the power element of the inverter, or directly measures the compressor suction pressure by a sensor, or estimates the compressor suction pressure based on a compressor suction temperature or on a compressor housing temperature. Also, the control device calculates a motor torque based on a motor rotational speed, a motor phase current, and a motor phase voltage, estimates a compressor discharge pressure based on the compressor suction pressure and the motor torque, and estimates a compressor discharge temperature based on the compressor suction pressure and the compressor discharge pressure. Consequently, with the use of the control device, the electric compressor is provided with discharge temperature detection means in place of a conventional thermal protector.
Inventors:
SAITO SATORU (JP)
NARUTA TOMOKAZU (JP)
KOYAMA SHIGEYUKI (JP)
NARUTA TOMOKAZU (JP)
KOYAMA SHIGEYUKI (JP)
Application Number:
PCT/JP2007/050204
Publication Date:
August 02, 2007
Filing Date:
January 11, 2007
Export Citation:
Assignee:
SANDEN CORP (JP)
SAITO SATORU (JP)
NARUTA TOMOKAZU (JP)
KOYAMA SHIGEYUKI (JP)
SAITO SATORU (JP)
NARUTA TOMOKAZU (JP)
KOYAMA SHIGEYUKI (JP)
International Classes:
F04B49/10; F25B1/00; H02P27/06
Foreign References:
| JPH06147661A | 1994-05-27 | |||
| JPH06109336A | 1994-04-19 | |||
| FR2865437A1 | 2005-07-29 |
Other References:
See also references of EP 1978254A4
Attorney, Agent or Firm:
BAN, Toshimitsu (Shinko Bldg. 1-9, Nishishinjuku 8-chom, Shinjuku-ku Tokyo 23, JP)
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