[특허]Direct current brushless motor

[미국특허] Direct current brushless motor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02K-011/00 H02K-021/12 H02K-001/22 H02P-007/06
출원번호	US-0840205 (1992-02-24)
발명자 / 주소	Porter Richard L. (Navarre FL)
출원인 / 주소	The United States of America as represented by the Secretary of the Air Force (Washington DC 06)
인용정보	피인용 횟수 : 75 인용 특허 : 0

초록 ▼

The variable speed, reversible, brushless, direct current motor comprises a rotor, electromagnets a switching transistor module and electronic controller module. The rotor is mounted on a shaft with bearings at each end, with a plurality of permanent magnets symmetrically placed thereon in an alternating field pattern. Each electromagnet invokes a magnetic field at two permanent magnet positions to cause rotation of the rotor. The switching transistor module receives power from two power sources to conduct current and energize the electromagnets. The electronic control module supplies alternating voltage to points on the transistor module. The switching waveform is triggered by infra-red pick-ups mounted next to the rotor. In operation, each time an electromagnet is switched in polarity, the rotor rotates thirty-six degrees until the permanent magnets are aligned with the electromagnet. Each time the polarity is switched, the permanent magnet that is aligned is repelled, while the permanent magnet approaching is attracted. The infra-red pick-ups switch at such a time to continue the rotation.

대표청구항 ▼

A brushless DC motor comprising a rotor which comprises a disk of non-magnetic material and a plurality of permanent magnets which alternate in polarity located around a periphery of the disk, said disk having a first set of holes located at a first radial distance along radii with the permanent magnets of a first polarity, and a second set of holes located at a second radial distance along radii with the permanent magnets of a second polarity; a stator comprising electromagnetic means having core means and winding means around the core means, with the core means having poles facing said periphery of the rotor, the winding means being connected between first and second terminals; a first IR transmitter and a first IR receiver located on opposite sides of the rotor at said first radial distance, and a second IR transmitter and a second IR receiver located on opposite sides of the rotor at said second radial distance; control means including a bistable device having a first input coupled to the first IR receiver and a second input coupled to the second IR receiver, so that each time a hole of said first set passes between the first IR transmitter and the first IR receiver a signal from the first IR receiver sets the bistable device to a first state, and each time a hole of said second set passes between the second IR transmitter and the second IR receiver a signal from the second IR receiver sets the bistable device to a second state, and output means coupled to the bistable device; switching means comprising a first switch device coupled between a first DC power source of a first polarity and said first terminal, and a second switch device coupled between a second DC power source of a second polarity and said first terminal, the second terminal being connected to a common point of the first and second power sources, the first switch device and the second switch device each having an input coupled to said output means of the control means, so that in response to said bistable device being in said first state the first switch device is turned on to cause current from the first DC power source to flow in a first direction through said winding means, and in response to said bistable device being in said second state the second switch device is turned on to cause current from the second DC power source to flow in a second direction through said winding means, whereby the electromagnetic means alternates in polarity to alternately attract and repel said permanent magnets to cause the rotor to rotate.

이 특허를 인용한 특허 (75) 인용/피인용 타임라인 분석

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[미국특허] Direct current brushless motor 원문보기

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