[특허]Linear actuator with feedback position sensor device

Linear actuator with feedback position sensor device 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02K-007/06 H02K-007/10 H02K-011/00 F04B-017/03
출원번호	US-0154953 (1993-11-19)
발명자 / 주소	Erhart Timothy A. (Chanhassen MN)
출원인 / 주소	Exlar Corporation (Chanhassen MN 02)
인용정보	피인용 횟수 : 96 인용 특허 : 0

초록 ▼

The present invention provides an electrically powered linear actuator. An elongated cylinder formed of a magnetic material and having an internally threaded bore is rotatably supported relative to the housing assembly. Magnets are mounted about an outer circumference of the cylinder to form an armature within the motor assembly. The thread engaging portion of the actuator assembly is moved along the threaded extent of the cylinder on rotation of the cylinder. Thus, the cylinder functions as an armature drive cylinder. The actuator assembly further includes a feedback position sensor. This sensor provides output shaft position location information to a controller which, in combination with a servo-amplifier, operates the linear actuator in a closed-loop feedback control environment. Further, such an actuator can be utilized in precision volumetric pump applications. In a volumetric pump application, the output shaft of the actuator includes a cylinder head which travels within a cylinder. Two pump strokes may be defined as a first intake stroke (e.g., when the output shaft is retracted) and a second exhaust stroke (e.g., when the output shaft is extended). Valves are utilized to control the entry and exit of fluid and other materials to and from the pump.

대표청구항 ▼

An electrically powered linear actuator comprising: (a) a housing assembly; (b) an energizable stator supported by the housing assembly; (c) elongated cylinder means of a magnetic material having means mounted about an outer circumference thereof for forming an armature with the cylinder means, the elongated cylinder means having an internally threaded bore to thereby define an armature drive cylinder; (d) means for rotatably supporting the cylinder means relative to the housing assembly; (e) an actuator assembly including an output shaft and a thread engaging portion operably coupled with the threaded bore of the cylinder means, the thread engaging portion being moved along the threaded bore of the cylinder means to provide bidirectional linear movement of the output shaft, the extent of the thread engaging portion being smaller than the extent of the internal threads extending along the cylinder means such that the difference therebetween defines a maximum actuation stroke for the actuator assembly, and the thread engaging portion including a plurality of transmission rollers interposed between and engaging both the output shaft and the threaded bore of the cylinder means; and (f) rotational position sensing means for sensing the rotational position of the armature drive cylinder and providing a positional signal representative thereof.

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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

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Linear actuator with feedback position sensor device 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (96)

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연합인증

Linear actuator with feedback position sensor device 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (96)

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