| 摘要 |
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.
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