Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-02-12
1990-12-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310328, H01L 4108
Patent
active
049805991
ABSTRACT:
An ultrasonic motor is provided with a moving member and a vibrating member which is in contact with the moving member so as to provide the drive input for the moving member. A piezoelectric vibrator is attached to one side of the vibrating member and the opposite side of the vibrating member has a plurality of circumferentially arranged projections. A top section of each projection contacts the moving member. The piezoelectric vibrator will generate a travelling wave on the vibrating member when a proper alternating current electrical power source is applied to the vibrating member. The vibrating member would then be oscillated in a tangential direction, a normal direction, and a radial direction. The oscillations along the tangential direction and the normal direction generate the travelling wave and only the oscillation along the tangential direction is related to the rotational speed of the moving member. The moving member will then rotate faster and provide a greater amount of output energy if the amplitude of the oscillation along the tangential direction is increased. A ratio is established between the width of the contact portion and the width of the vibrating member. When the ratio of the widths is established in a predetermined range, the efficiency of the ultrasonic motor is improved.
REFERENCES:
patent: 4495432 (1985-01-01), Katsuma et al.
patent: 4587452 (1986-05-01), Okumura et al.
patent: 4763148 (1988-08-01), Tsukimoto et al.
Fujie Naofumi
Kuwabara Yasuo
Saeki Takao
Aisin Seiki Kabushiki Kaisha
Budd Mark O.
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