Skipping frequencies for variable speed controls

a variable speed control and frequency control technology, applied in the direction of positive displacement liquid engine, pump parameter, piston pump, etc., can solve the problem that the control does not necessarily determine the required operating frequency of the motor

Inactive Publication Date: 2006-09-07
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In a disclosed embodiment of this invention, the undesirable frequencies for a particular component associated with an electric motor are identified. As motor frequency is varied, the control is programmed to avoid those undesirable frequency zones. In known control algorithms for an electric motor associated with a refrigerant system, the frequency is varied, and the resultant change from the refrigerant system operation is monitored. The control has a desired system operational feature. That desired operational feature may be the cooling capacity of the refri

Problems solved by technology

In one well-known control method, the control does not necessa

Method used

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  • Skipping frequencies for variable speed controls
  • Skipping frequencies for variable speed controls

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Embodiment Construction

[0016]FIG. 1 shows a refrigerant system 20 incorporating compressor 22 delivering a compressed refrigerant to a heat exchanger 24. The heat exchanger 24 is associated with a fan 26 for driving air over the heat exchanger 24. The fan 26 is associated with a motor, as known. A variable speed control C and a transducer T are associated with the fan 26. The variable speed control C drives the motor for the fan 26, and the transducer T may identify one of the parameters associated with vibration level at the fan.

[0017] Refrigerant passes from the heat exchanger 24 downstream to an expansion device 28, and then to another heat exchanger 30. The heat exchanger 30 is associated with its own fan 32. A variable speed motor control C and transducer T are also associated with the fan 32.

[0018] The refrigerant passes from the heat exchanger 30 back to the compressor 22. As is known, a motor drives a compressor unit 22, and a variable speed control C and a transducer T are associated with the c...

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PUM

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Abstract

A control for an electric motor is utilized to avoid operation in or near the resonance frequencies for the electric motor and its associated system components. The resonance frequencies can be identified experimentally at the design stage, or during operation of a component and electric motor. During start-up, shutdown or frequency adjustment, the control drives the speed through the resonance frequency zones more rapidly, and also avoids operation in or near those resonance frequencies during steady state operation. In disclosed embodiments, the electric motors are associated with fans, pumps and compressors in a refrigerant system.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to a method of avoiding objectionable frequencies for equipment driven by a variable speed motor, and in particular for motors driving equipment utilized in refrigerant systems. [0002] Electric motors are utilized in refrigerant systems to drive the fans, pumps and compressors. As is known, in a basic refrigerant system, a compressor compresses a refrigerant and delivers that refrigerant downstream to a first heat exchanger. The first heat exchanger exchanges heat between the refrigerant and another heat transfer media such as air, and passes the refrigerant to an expansion device. From the expansion device, the refrigerant is delivered to another heat exchanger, and heat is again exchanged with another heat transfer media. From the second heat exchanger, refrigerant is returned to the compressor. Fans or pumps are associated with each of the two heat exchangers, and a motor is typically associated with each fan or pump. Furt...

Claims

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Application Information

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IPC IPC(8): F04B17/00
CPCF04B17/03F04B35/04F04B2201/0806F04B2203/0204F04B2203/0209F25B49/025F25B2500/13F25B2600/0253F25B2600/112H02P23/0063H02P23/04Y02B30/741Y02B30/743H02P23/20Y02B30/70
Inventor LIFSON, ALEXANDERTARAS, MICHAEL F.
Owner CARRIER CORP
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