[특허]Control system for sensorless brushless DC motor

Control system for sensorless brushless DC motor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-005/06
출원번호	US-0112036 (1993-08-26)
발명자 / 주소	DiTucci Joseph (16 August Rd. Simsbury CT 06070)
인용정보	피인용 횟수 : 37 인용 특허 : 0

초록 ▼

Control circuitry for a brushless direct current motor is premised on constructing phase to phase back emf signals representing the differences between the back electromotive force efforts produced in each phase winding of the motor. The phase to phase back emf signals are used to produce logic level signals having logic level changes at the zero voltage crossover points of the phase to phase back emf signals. Detection of the zero voltage crossover points is dictated by selectively activated comparator circuits. A method is also disclosed as to how the values of certain circuit elements may be derived.

대표청구항 ▼

A drive system for a brushless direct current motor having a plurality of phase windings which are energized by the timed application of drive voltages producing drive currents and back electromotive force voltage conditions in the respective windings, said drive system comprising: a plurality of circuits for defining differences between back electromotive force voltage conditions present on two successive phase windings of the brushless direct current motor, each circuit including a pair of resistance and capacitance configurations, each resistance and capacitance configuration adjusting a drive voltage of one the successive phase windings and a differential amplifier downstream of the resistance capacitance configurations for defining the difference in adjusted voltages from the respective resistance capacitance configurations; a plurality of circuits for sensing the drive currents being applied to the respective phase windings of the brushless direct current motor, each current sensing circuit defining a current source for particular resistance and capacitance configurations in the circuits for defining differences between back electromotive force voltage conditions present on two successive phase windings wherein each particular resistance capacitance configuration experiences current source effect corresponding to the drive current in the phase winding to which the drive voltage is to be adjusted; a plurality of comparator circuits, each associated with a respective differential amplifier in one of the circuits for defining differences between back electromotive force voltage conditions present on two successive phase windings, wherein each comparator circuit is operative to detect zero voltage levels in the output signals from the respective differential amplifier; and circuitry responsive to the detected zero voltage levels for defining switching signals that control the application of drive voltages to the respective phase windings of the brushless direct current motor.

이 특허를 인용한 특허 (37)

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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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연합인증

Control system for sensorless brushless DC motor 원문보기

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Control system for sensorless brushless DC motor 원문보기

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이 특허를 인용한 특허 (37)

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