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US 6,134,901 AGranted
Method of speed control of compressor and control arrangement using the method
AssigneeDanfoss Compressors GmbH
InventorsNils-Ole Harvest, Jan Aarestrup
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AssigneeDanfoss Compressors GmbH
InventorsNils-Ole Harvest, Jan Aarestrup
Estimating the term…
The invention concerns a method for speed control of a compressor, particularly a refrigeration compressor, and a control arrangement using this method. The speed control is effected in that a control arrangement varies the speed of an electric motor in dependence of simple ON/OFF signals from a thermostat placed in the surroundings to be cooled. The method according to the invention is characterized in that the starting speed of the compressor in a following ON period is reduced in relation to the final speed in the previous ON period. A continuous reduction of the starting speed of each ON period results in a self-regulating control giving long compressor operation times and an averagely low speed resulting in energy savings. A control arrangement using this method is also described.
Method for controlling motor speed in a compressor used in cooling an area such as a room, the compressor having an electronic control arrangement, which, from a thermostat having ON and OFF states, receives a signal depending on the temperature in the room to be cooled, and the compressor having a variable starting speed, the method comprising the steps of reducing the starting speed in a subsequent ON period in relation to the final speed in a previous ON period by making the control arrangement subtract a predetermined speed from the final speed in the previous ON period and using the result of this calculation as the starting speed in the subsequent ON period, and during the ON period either increasing or keeping the speed constant.
Variable speed control for regulating the motor speed in a refrigeration compressor used in cooling an area such as a room, comprising an electronic control arrangement for receiving a temperature signal from a thermostat placed in the room to be cooled, the thermostat having ON and OFF states, the control arrangement having means to reduce the starting speed of the compressor in a subsequent ON period in relation to the final speed in the previous ON period by subtracting a predetermined speed from the final speed in the previous ON period, and using the result of this calculation as the starting speed in the following ON period.
Method for speed control of a motor in a compressor by means of an electronic control arrangement receiving a temperature signal from a thermostat having ON and OFF states, and in which the speed determined by the control arrangement is a function of the duration of at least one of the ON period and OFF period, comprising steps of reducing the motor speed if the thermostat sends an OFF state signal before a first time t1, maintaining the motor speed if the thermostat sends an OFF state signal after the first time t1 but before a second time t2, and increasing the motor speed if the thermostat has not sent an OFF state signal by the time t2.
Dependencies are inferred from the claim text.