Integral compressor motor and refrigerant/oil heater apparatus and method

A technology of compressors and motors, applied in the direction of machines/engines, pump control, mechanical equipment, etc., can solve the problems of low heat transfer efficiency of refrigerants and oil, problems in structure and maintenance, etc.

Inactive Publication Date: 2012-12-05
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In use, external heaters must be protected from moisture and corrosion during thermal cycling, which can be problematic both in terms of construction and maintenance
Also, these external heaters may result in inefficient heat transfer to the refrigerant and oil in the compressor

Method used

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  • Integral compressor motor and refrigerant/oil heater apparatus and method
  • Integral compressor motor and refrigerant/oil heater apparatus and method
  • Integral compressor motor and refrigerant/oil heater apparatus and method

Examples

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Embodiment Construction

[0010] In general, exemplary embodiments of the present invention include connecting a motor such as an electric motor (eg, a compressor motor) to a constant current power source (DC or AC) that can heat the motor without generating a force output winding. This enables the motor to provide heater functionality during periods of motor shutdown, ie, when the motor is not providing force output (ie, performing mechanical work). For example, heat generated by a motor can be used to increase lubricant viscosity. Also, by utilizing the motor to generate heat for a selected period of time before starting the motor to generate force output, the motor can be controlled to reduce flooded starts, which would otherwise be critical for compressor motors with fluid that can migrate to the compressor Reliability issues may arise. While the invention provides many useful benefits when applied to compressor motors, the invention is also useful for other types of systems with motors.

[0011...

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PUM

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Abstract

A compressor apparatus includes a power source (26), a shell (12; 42), an electric motor (28; 52; 100; 200) having motor windings, and a control assembly (106; 206). The electric motor (28; 52; 100; 200) is located within the shell (12; 42). The control assembly a control assembly (106; 206) provides power to the motor windings from the power source (26) in two modes. A first mode provides power to the motor windings to generate heat without producing force output with the motor (28; 52; 100; 200). A second mode provides power to the motor windings to produce force output with the motor (28; 52; 100; 200). The control assembly (106; 206) activates the first mode for a selected time period prior to activation of the second mode in order to drive out a fluid (36) to reduce a risk of a flooded compressor start.

Description

Background technique [0001] The present invention relates to methods and apparatus for heating electric motors and adjacent fluids. [0002] Electric motors, such as electric compressor motors used in refrigeration units, often operate in a range of ambient temperature conditions. During operation at relatively low ambient temperatures, the compressor is often cycled on and off due to limited load demand. During compressor shutdown, the temperature of fluids (eg, oil and refrigerant) associated with the refrigeration unit and compressor may be very low. Such low fluid temperatures may, for example, affect oil delivery when the compressor is started, thereby reducing compressor reliability. Additionally, if the refrigeration unit is turned off for an extended period of time (typically longer than about 6 hours), the liquid refrigerant begins to migrate towards the compressor, which is usually the largest component in the system. The presence of refrigerant in the compressor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B17/04F04B35/04
CPCF04B49/02F04B49/065F04B2201/0403F04B2205/10F04B2203/0208
Inventor J·J·伯奇尔Y·H·陈
Owner CARRIER CORP
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