PIEZOELECTRIC MOTOR (DESIGN VERSIONS) Russian patent published in 2000 - IPC

FIELD: fractional- horsepower motors for automatic-control systems, instrumentation engineering, and robotics. SUBSTANCE: motor has longitudinal-vibration transducer mounted in parallel with rotor axis of revolution and provided with end gaskets fitted between two rotor disks and held in position by means of hold-down device. One of rotor disks is rigidly fixed on shaft. Push-rods are inserted between ends of gaskets and those of rotor disks at certain angle to them. Second-disk-to-shaft joint provides for utmost stiffness of rotor in axial direction for displacing mention disk over shaft. Second rotor disk may be fitted onto shaft through threaded joint and spring-loaded thereon by means of torsional spring whose torsional rigidity is at least an order of magnitude lower than that of shaft. Second disk may be tightly fitted to vibration transducer through push-rods by means of nut actuated by pliable torsional spring in turn-in direction. Push-rods may be secured on one side of disk ends or their central parts may be secured within flexible bushings. Angle of each push-rod does not exceed angle of friction between push-rods and gasket or disk. Inherent frequency of first waveform of torsional vibrations of push-rods approaches excitation frequency of vibration transducer. Gaskets of the latter and rotor disks are made of material whose mechanical endurance is lower than that of push- rod material. Loose ends of push-rods are supported by annular drillings on ends of vibration transducer gaskets. EFFECT: improved efficiency, tractive characteristics, and service life of motor. 9 cl, 2 dwg