[특허]Driving system for single phase A-C induction motor

Driving system for single phase A-C induction motor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-007/00
출원번호	US-0132614 (1987-12-10)
발명자 / 주소	Wills Frank E. (York PA) Shaffer Jr. Jacob E. (York PA)
출원인 / 주소	York International Corporation (York PA 02)
인용정보	피인용 횟수 : 52 인용 특허 : 0

초록 ▼

By employing a single phase pulse width modulated inverter system, a-c power line voltage may be effectively converted to single phase, variable amplitude and frequency sinusoidal voltage for driving a single phase a-c induction motor at an adjustable speed. The motor may be driven directly in response to the power line voltage (such as during start-up or when it is desired to run the motor at the power line frequency) by bypassing the inverter system and connecting the motor across the power line. Reduced energy consumption may be obtained by operating the motor in response to a reduced inverter output frequency. Switching the motor from the power line to the inverter, and vice versa, is accomplished without interruption. Immediately prior to each, switchover the inverter output voltage is synchronized to the power line voltage to minimize any electrical disturbance during the switching transition.

대표청구항 ▼

A driving system for driving a single phase A-C induction motor at selected, variable speeds comprising: a positive D-C voltage of fixed magnitude; a negative D-C voltage of the same fixed magnitude; means for developing both a sinusoidally weighted pulse width modulated switching signal having a high frequency and a selectively adjustable single phase sine wave modulation signal representative of the desired A-C signal to be applied to the motor, the switching frequency of said switching signal being very high relative to that of the sine wave modulation signal; means for selectively adjusting at least the frequency of said single phase sine wave modulation signal, as desired, to thereby adjust the speed of the motor; a low pass filter having an inductance coil, connected in series with the motor, and a capacitor, connected in parallel with the motor, said low pass filter having the capability of filtering out the high frequency components associated with the switching signal and passing along to the motor only the components associated with the sine wave modulation component of the switching signal; means, including a first power switch, for coupling the motor and low pass filter across the positive D-C voltage; means, including a second power switch, for coupling the motor and low pass filter across the negative D-C voltage; means, coupled with said means for developing a switching signal and responsive to said switching signal, for turning said power switch means on in alternation in order to couple the motor and low pass filter alternately to the positive and negative D-C voltages; and said low pass filter filtering out all high frequency signal components and applying to the motor a selectively adjustable single phase sinusoidal voltage having a frequency equal at a given time to the then selected frequency of the sine wave modulation signal, whereby the speed of the motor is controlled by the adjusting means.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Driving system for single phase A-C induction motor 원문보기

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Driving system for single phase A-C induction motor 원문보기

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