Controlling a voltage-to-frequency ratio for a variable speed drive in refrigerant systems
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-001/00
F25B-049/00
출원번호
US-0191679
(2005-07-28)
등록번호
US-7481069
(2009-01-27)
발명자
/ 주소
Lifson,Alexander
Taras,Michael F.
출원인 / 주소
Carrier Corporation
대리인 / 주소
Carlson, Gaskey & Olds
인용정보
피인용 횟수 :
2인용 특허 :
23
초록▼
A refrigerant system is provided with at least one variable frequency drive. In the past, the variable frequency drives were operable such that the voltage-to-frequency ratio remained constant regardless of operation. The present invention realizes that variations in the voltage-to-frequency ratio
A refrigerant system is provided with at least one variable frequency drive. In the past, the variable frequency drives were operable such that the voltage-to-frequency ratio remained constant regardless of operation. The present invention realizes that variations in the voltage-to-frequency ratio may be desirable, and the refrigerant system control drives the motors associated with relevant refrigerant system components to reach an optimum voltage-to-frequency ratios in order to achieve higher efficiency, provide operational safety and prevent nuisance shutdowns.
대표청구항▼
What is claimed is: 1. A refrigerant system comprising: a compressor delivering a compressed refrigerant downstream to a condenser, refrigerant passing from said condenser to an expansion device, and from said expansion device to an evaporator, refrigerant passing from said evaporator back to said
What is claimed is: 1. A refrigerant system comprising: a compressor delivering a compressed refrigerant downstream to a condenser, refrigerant passing from said condenser to an expansion device, and from said expansion device to an evaporator, refrigerant passing from said evaporator back to said compressor, a fluid-moving device for moving fluid over said condenser, and a fluid-moving device for moving fluid over said evaporator, said fluid-moving devices for said condenser and said evaporator, and said compressor all being provided with an electric motor, and at least one of said electric motors being provided with a variable speed drive; and a control for said refrigerant system, said control being operable to control said variable speed drive, said variable speed drive being operable to change the frequency of operation of said at least one electric motor, and to independently change the voltage supplied to said at least one electric motor, and said control determining optimum values for said frequency and said voltage, and driving said at least one electric motor to said desired frequency and said desired voltage. 2. The refrigerant system as set forth in claim 1, wherein said fluid-moving devices for moving fluid over said condenser and said evaporator are fans. 3. The refrigerant system as set forth in claim 1, wherein said fluid-moving devices for moving fluid over said condenser and said evaporator are pumps. 4. The refrigerant system as set forth in claim 1, wherein said compressor is provided with an unloader circuit. 5. The refrigerant system as set forth in claim 1, wherein a suction modulation valve is placed between said evaporator and said compressor. 6. The refrigerant system as set forth in claim 1, wherein an optimum ratio of the voltage-to-frequency is determined based upon a motor load, and said control driving said frequency and said voltage to achieve said optimum voltage-to-frequency ratio. 7. The refrigerant system as set forth in claim 6, wherein voltage is increased as said motor load increases towards a predetermined high value. 8. The refrigerant system as set forth in claim 1, wherein said at least one compressor is one of a reciprocating compressor, scroll compressor, screw compressor, and rotary compressor. 9. The refrigerant system as set forth in claim 1, wherein said system includes at least one sensor from a set of pressure transducers, temperature transducers, current sensors, torque sensors, and power sensors. 10. The refrigerant systems as set in claim 9, wherein the said control determining optimum values for said frequency and said voltage based on the measurements from any of said sensors. 11. The refrigerant system as set forth in claim 1, wherein an optimum voltage to frequency ratio extends along a curve. 12. The refrigerant system as set forth in claim 1, wherein an infinite number of optimum voltage to frequency ratios may be selected. 13. A method of operating a refrigerant system comprising the steps of: delivering a compressed refrigerant downstream to a condenser, refrigerant passing from said condenser to an expansion device, and from said expansion device to an evaporator, refrigerant passing from said evaporator back to said compressor; fluid over said condenser, and moving fluid over said evaporator, fluid-moving devices for said condenser and said evaporator, and said compressor all being provided with an electric motor, and at least one of said electric motors being provided with a variable speed drive; and controlling said variable speed drive, to change the frequency of operation of said at least one electric motor, and to independently change the voltage supplied to said at least one electric motor, and determining optimum values for said frequency and said voltage, and driving said at least one electric motor to said desired frequency and said desired voltage. 14. The method as set forth in claim 13, wherein an optimum ratio of the voltage-to-frequency is determined based upon a load on the refrigerant system, and said control driving said frequency and said voltage to achieve said optimum ratio. 15. The method as set forth in claim 14, wherein voltage is increased as load increases towards a predetermined high value. 16. The method as set in claim 13, wherein the optimum values for frequency and voltage are based on measurements from sensors.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (23)
Kanazawa Hidetoshi (Fujinomiya JPX), Air conditioner.
Sato Takashi (Shizuoka-ken JPX) Kageyama Yasuhiro (Shizuoka-ken JPX) Isshiki Masao (Shizuoka-ken JPX) Nukushina Harunobu (Shizuoka-ken JPX), Air conditioner and control method for an air conditioner.
Street, Norman E.; Sunderland, Ted W.; Thomas, Charles D.; Shapiro, Doron; D'Anna, Michael J.; Doerr, Dennis, Distributed intelligence control for commercial refrigeration.
Scaringe Robert P. ; Gui Fulin ; Benedict Scott M., Magnetic bearing centrifugal refrigeration compressor and refrigerant having minimum specific enthalpy rise.
Lorentzen Gustav (Trondheim NOX) Pettersen Jostein (Trondheim NOX) Bang Roar R. (Trondheim NOX), Method and device for high side pressure regulation in transcritical vapor compression cycle.
Kampf Hans,DEX ; Lochmahr Karl,DEX ; Reischl Brigitte Taxis,DEX, Method for operating an air conditioner in a motor vehicle, and an air conditioner having a refrigerant circuit.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.