Electromagnetic-driving device and light quantity-control...

Details Electromagnetic-driving device and light quantity-control... Electromagnetic-driving device and light quantity-control...

2006-04-25

2008-11-04

Nasri, Javaid (Department: 2839)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

07446443

ABSTRACT:
An electromagnetically-driving device has a rotor with a hollow, cylindrical permanent magnet; an inside yoke on an internal circumference side of the rotor; an outside yoke on an external circumference side of the rotor; and a coil for magnetically exciting the yokes. The outside yoke has a trough shape, and two opposed magnetic pole-guide pieces, between which magnetic poles of the permanent magnet are sandwiched. The rotor has a bearing portion in the internal circumference wall of the body, and the bearing portion engages a shaft portion of the inside yoke. When a magnetic field is generated by the coil, a rotation force is applied to the rotor, resulting in a structurally-simple magnetic circuit.

REFERENCES:
patent: 2007/0159030 (2007-07-01), Naganuma et al.
patent: 2001-298936 (2001-10-01), None
patent: 2002-049076 (2002-02-01), None

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