Electronically commutated external rotor motor with a...

Details Electronically commutated external rotor motor with a... Electronically commutated external rotor motor with a...

2008-02-21

2010-10-12

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S071000, C310S081000, C310S06800R, C257S659000

Reexamination Certificate

active

07812488

ABSTRACT:
An electronically commutated motor (ECM21) has reduced vulnerability to Electro-Static Discharge (ESD). The motor has an internal stator (50) and an external rotor (22) equipped with a permanent magnet (28), which rotor is separated by an air gap from the internal stator (50). The rotor has a shaft (34) on which a magnetic yoke element (24) is mounted. A leakage flux region on an end face (27) of the magnet (28) actuates a Hall sensor (48) located adjacent a first aperture (48′) in a circuit board (46) supporting electronic control components. In order to prevent static discharges from passing through the first aperture (48′) and endangering the electronic components, the circuit board (46) is formed with a second aperture (43) on whose edge is provided at least one electrical conductor (95′, 95″), connected to ground (112), to which any charge that builds up during operation can harmlessly discharge.

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Wikipedia, Definition of ZAMAK alloy (expired US TM 222,098); 2 pages.
Patent Abs. of Japan, abstracting JP 04-325 852-A, AZUMA/CANON, published Nov. 16, 1992 (one page).
Patent Abs. of Japan, abstracting JP 09-311 057-A, KOMAI/MATSUSHITA., published Dec. 2, 1997 (one page).

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