Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1989-09-07
1991-03-19
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310323, 310325, H01L 4108
Patent
active
050013823
ABSTRACT:
According to the invention, there is provided a stepping motor comprising a laminate type torsion actuator having a pair of cylindrical outer peripheries to be torsionally displaced relative to each other, a cylindrical fixed member surrounding said laminate type torsion actuator with certain space therebetween, first longitudinally vibrating elements placed between said fixed member and one of the cylindrical outer peripheries of said laminate type torsion actuator for selectively connecting or separating the fixed member and the torsion actuator through its elongation or contraction, second longitudinally vibrating elements placed between said fixed member and the other cylindrical peripheries of said torsion actuator with certain space therebetween for selectively connecting or separating the fixed member and the torsion actuator through its elongation or contraction with a phase inverse to that of the first elements. Such a stepping motor allows fine control of its rotary speed and position and large torque.
REFERENCES:
patent: 4562374 (1985-12-01), Sashida
patent: 4885499 (1989-12-01), Ueha et al.
Kurosawa Minoru
Ohnishi Kazumasa
Umeda Mikio
Alps Electric Co. ,Ltd.
Budd Mark O.
Shoup Guy W.
Winters Paul J.
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