Method and a control system for starting a motor for driving a compressor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-001/00
H02P-001/22
H02P-001/18
출원번호
UP-0528011
(2006-09-27)
등록번호
US-7514892
(2009-07-01)
우선권정보
DK-2005 01361(2005-09-29)
발명자
/ 주소
Pedersen, Niels
Thomsen, Rune
출원인 / 주소
Danfoss Compressors GmbH
대리인 / 주소
McCormick, Paulding & Huber LLP
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
A method and a control system for starting a motor (19), in particular a motor (19) for driving a compressor. The rotational speed (24) of the motor (19) is measured and compared to a minimum value. In the case that ωmotor (24) is smaller than the minimum value after a predefined time interval
A method and a control system for starting a motor (19), in particular a motor (19) for driving a compressor. The rotational speed (24) of the motor (19) is measured and compared to a minimum value. In the case that ωmotor (24) is smaller than the minimum value after a predefined time interval has lapsed, the motor (19) is stopped, and the maximum current level to be supplied by the power source (18) is changed, preferably increased, before a new attempt to start the motor (19) is initiated. Preferably, the voltage (22) supplied to an electronic unit (21) is also measured, and in the case that it drops below a minimum voltage level, the motor (19) is stopped, and the maximum current level is changed, preferably decreased, before a new start attempt is initiated. It is possible to adjust the supplied current level in such a way that power is conserved while sufficient lubricated of the moving parts of the compressor is ensured.
대표청구항▼
The invention claimed is: 1. A method of starting a motor (19), the method comprising the steps of: 1. connecting a power source (18) to input terminals of an electronic unit (21) controlling the motor (19), thereby supplying a current (23) to the electronic unit (21) from the power source (18), th
The invention claimed is: 1. A method of starting a motor (19), the method comprising the steps of: 1. connecting a power source (18) to input terminals of an electronic unit (21) controlling the motor (19), thereby supplying a current (23) to the electronic unit (21) from the power source (18), the electronic unit (21) ensuring that the supplied current (23) does not exceed a predefined maximum current level, Imax, 2. at least substantially continuously measuring a rotational speed, (ωmotor, of the motor (19), and comparing ωmotor to a predefined minimum rotational speed, ωmin, 3. in the case that ωmotor is smaller than ωmin after a predefined time interval has lapsed, stopping the motor (19), 4. changing the predefined maximum current level, Imax, to be supplied from the power source (18) to the electronic unit (21), and 5. repeating steps 1-4 until it is obtained that ωmotor≧ωmin. 2. A method according to claim 1, wherein ωmin is chosen as the minimum rotational speed required in order to ensure sufficient lubrication of the motor (19) or of a compressor driven by the motor (19). 3. A method according to claim 1 or 2, further comprising the steps of: at least substantially continuously measuring an input voltage, Vinput, at the electronic unit (21) input terminals, and comparing Vinput to a predefined minimum voltage, Vmin, and in the case that Vinput becomes smaller than Vmin, stopping the motor (19), and wherein step 5 further comprises repeating said steps and steps 1-4 until it is obtained that Vinput≧Vmin. 4. A method according to claim 3, wherein step 4 comprises lowering Imax in the case that Vinput becomes smaller than Vmin, and increasing Imax in the case that ωmotor is smaller than ωmin after the predefined time interval has lapsed. 5. A method according to any of the preceding claims, further comprising the step of waiting for a specified time interval after the motor (19) has been stopped and before repeating steps 1-4. 6. A control system for controlling starting of a motor (19), the control system comprising: means for at least substantially continuously measuring a rotational speed, (ωmotor, of the motor (19), means for comparing ωmotor to a predefined minimum rotational speed, ωmin, means for generating a stop signal to the motor (19) in response to an output from the comparing means, and in the case that ωmotor is smaller than ωmin after a predefined time interval has lapsed, thereby stopping the motor (19), and means for controlling the maximum permitted current level, Imax, to be supplied from a power source (18) to an electronic unit (21) controlling the motor (19) in response to the stop signal. 7. A control system according to claim 6, further comprising: means for at least substantially continuously measuring an input voltage, Vinput, at input terminals of the electronic unit (21), means for comparing Vinput to a predefined minimum voltage, Vmin, and means for generating a stop signal to the motor (19) in response to an output from the comparing means, and in the case that Vinput becomes smaller than Vmin, thereby stopping the motor (19). 8. A control system according to claim 6 or 7, wherein the means for controlling the maximum current level, Imax, is or forms part of a microcontroller. 9. A control system according to any of claims 6-8, wherein the power source (18) comprises a battery. 10. A starter assembly for a motor (19), the starter assembly comprising a control system according to any of claims 6-9. 11. A starter assembly according to claim 10, the starter assembly being adapted to be powered by a battery. 12. A starter assembly according to claim 10 or 11, wherein the motor (19) is adapted to drive a compressor.
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이 특허에 인용된 특허 (10)
Reichard Jeffrey A. ; Lemcke Michael ; Uzumcu Ali I., Controller for variable speed motor.
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