Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-07-15
1995-05-23
Blankenship, Howard B.
Electrical generator or motor structure
Dynamoelectric
Rotary
3542711, 310 49R, 310156, G03B 908, H02K 2112
Patent
active
054185882
ABSTRACT:
A light-quantity adjusting device, comprising light-blocking blades supported to be moveable and arranged to be moved for adjusting a quantity of light, a moving mechanism for moving the light-blocking blades and a stepping motor serving as a drive source for the moving mechanism. The stepping motor includes a rotor magnetized to 2n poles (n=2, 3, 4, . . . ), the center of magnetization in each pole of the rotor being deviated from the center of the pole, first and second stators each having a plurality of magnetic poles formed adjacent to the outer periphery of the rotor and first and second coils arranged on the first and second stators. The first and second stators are located so as to be mutually displaced by about 90 degrees in terms of electrical angle and being provided with two magnetic poles located so as to be mutually displaced by about 180 degrees in terms of electrical angle and further being located so as to be mutually displaced by about 90+180 degrees times m (m=0, 1, 2, . . . ) in terms of electrical angle.
REFERENCES:
patent: 3978356 (1976-08-01), Spiesberger
patent: 4952859 (1990-08-01), Torisawa et al.
patent: 5095238 (1992-03-01), Suzuki et al.
Blankenship Howard B.
Canon Kabushiki Kaisha
Han J. K.
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