Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1989-08-29
1991-06-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310323, 310366, 310333, H01L 4108
Patent
active
050270281
ABSTRACT:
A piezoelectric motor having a cylindrical outer motor casing formed by a separable two part housing that encloses and supports 3 piezoelectric actuators and a group of rotatable components. The rotatable components include a rotating output shaft that extends from the housing for coupling a load thereto, three drive rollers that engage the output shaft and are evenly spaced thereabout, and an idler ring assembly that secures the drive rollers about the output shaft when the motor is assembled. The housing has six piezoelectric stacks mounted in a fixed position to interior surfaces of the housing. Each stack is cylindrical with one flat end attached to the housing and the other flat end having a truncated cone shaped crown roller mounted thereon. The stacks are positioned so that when the two housing parts are assembled the piezoelectric stacks are aligned in pairs with their crown rollers adjacent each other to provide three piezoelectric actuators evenly spaced at 120 degree intervals about the center line of the motor. The three piezoelectric actuators support and position the rotatable components within the assembled housing during motor operation. When electrically energized by at least a pair of out of phase sinusoidal voltages the stacks deform along two perpendicular axes so that the crown rollers nutate in a substantially circular motion while bearing against internal surfaces of the three drive rollers to cause rotation of the drive rollers. External surfaces of the drive rollers engage the output shaft to cause it to rotate. Power amplifiers that provide the voltage drive required by high capacitive devices such as this motor are disclosed in U.S. Pat. No. 4,628,275 referenced in this patent application.
REFERENCES:
patent: 2434648 (1948-01-01), Goodale, Jr. et al.
patent: 3127527 (1964-03-01), Elston et al.
patent: 3177382 (1965-04-01), Green
patent: 3370187 (1968-02-01), Straube
patent: 4202605 (1980-05-01), Heinz
patent: 4523120 (1985-06-01), Assard
patent: 4628275 (1986-12-01), Skipper et al.
patent: 4757223 (1988-07-01), Ueyama
patent: 4775815 (1988-11-01), Heinz
patent: 4782262 (1988-11-01), Kiyo-Oka
Piezoelectric Actuators Generate Many Motion Patterns, Lyle H. McCarty, pp. 136-138, Design News/6-8-87.
A New Concept in Motors: Ultrasonic Wave Oscillation Drive Energy, Journal of Electrical Engineering, Jan. 1988, pp. 42-44.
Novel Three-Dimensional Positioner and Scanner for the STM Using Shear Deformation of Piezoceramic Plates, Uozumi et al., Jan. 88, pp. L123-126.
Budd Mark O.
Wells Charles C.
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