Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-05-30
1992-10-27
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
051592240
ABSTRACT:
A vibration motor having a disk-shaped stator containing a piezoelectric excitation system, a disk-shaped rotor aligned parallel to the stator and mounted on a driven shaft in a manner fixed against relative rotation, and a pressing element that presses the rotor and stator together axially. To assure free travel of the driven shaft when the motor is currentless, the pressing element is embodied as a force-transmitting element that changes shape as a function of temperature, for instance a compression spring of memory metal. In motor operation, the element is kept at a temperature above its temperature point for the shape change, and it is disposed such that the pressing force between the rotor and stator diminishes as a result of the shape change ensuing if the temperature drops below this temperature point.
REFERENCES:
patent: 4739212 (1988-04-01), Imasaka et al.
patent: 4755705 (1988-07-01), Holum
patent: 4771203 (1988-09-01), Mukohjima et al.
patent: 4924852 (1990-05-01), Suzuki et al.
patent: 4983874 (1991-01-01), Yamaguchi
patent: 4989277 (1991-02-01), Tsutsui et al.
patent: 5049774 (1991-09-01), Kuwabara et al.
Traveling Wave Ultrasonic Motors Offer, by Y. Ise JEE, Jun. 1986, pp. 66-70.
Haegele Karl-Heinz
Kramer Claus
Taubitz Bernd
Budd Mark O.
Dougherty Thomas M.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
LandOfFree
Vibration motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vibration motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibration motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-907573