Refrigerant cycle system

a technology of refrigerant cycle and cycle system, which is applied in the direction of domestic cooling apparatus, piston pumps, lighting and heating apparatus, etc., can solve the problems of large current value inputted into electric motors, significantly worsening of air conditioning etc. in passenger compartments, etc., and achieves the effect of avoiding excessive temperature ris
US20090241570A1Inactive Publication Date: 2009-10-01DENSO CORP
7 Cites 52 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
DENSO CORP
Publication Date
2009-10-01
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

In a refrigerant cycle system, a compression mechanism of an electric compressor sucks and compresses refrigerant, and an electric motor that drives the compression mechanism is cooled by the refrigerant. A variable throttle mechanism decompresses the refrigerant discharged from the electric compressor. A motor temperature detector detects a temperature of the electric motor. A motor protection determiner determines whether the temperature of the electric motor detected by the motor temperature detector is equal to or higher than a criterion value. A motor protection controller controls the variable throttle mechanism so that an opening degree of the variable throttle mechanism does not decrease when the motor protection determiner determines that the temperature of the electric motor is equal to or higher than the criterion value.
Need to check novelty before this filing date? Find Prior Art

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is based on and incorporates herein by reference Japanese Patent Application No. 2008-082749 filed on Mar. 27, 2008.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a refrigerant cycle system having an electric compressor.

[0004] 2. Description of Related Art

[0005] Conventionally, in an electric compressor in which a compression mechanism and an electric motor for driving the compression mechanism are integrated, a temperature protection control is performed as disclosed in JP2006-291878A and JP2005-248730A, for example. In order to avoid excessive temperature rise of the electric motor, the temperature protection control is performed when the temperature of an inverter, the electric motor, etc., excessively rises due to heavy load condition of the electric compressor.

[0006] In JP2006-291878A, the temperature of the electric motor is evaluated on the basis of the motor speed of t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More