Piezo element used for electromagneti ultrasound motor

Because the USM ultrasound piezo ceramic cylinder has adopted a completely new operating mechanism, it has broken the electricity that has so far been obtained by electromagnetic action.

The concept of ultrasound motor not only breaks the traditional electromagnetic induction principle in thought, but also compensates for the deficiency of the traditional ultrasound motor with its excellent performance characteristics, which has aroused people's intense interest and high expectations. 

Although USM piezo cylinder transducer has a short history of development, it has shown good application prospects. Firstly, the operation mechanism of the ultrasonic motor is analyzed, and the formation of the elliptical motion trajectory of the stator surface of the traveling wave ultrasonic motor is established, and the mathematical model of the traveling wave ultrasonic motor is established. Then to design the measurement and control system. It can be seen from the operating principle and output torque of the ultrasonic motor that the two phases of the piezoelectric ceramic transducer pass through.which is alternating currents that are mutually shifted by a certain phase shift, and when the phase difference is ginger, the output torque reaches a maximum value. For the traveling wave type. two excitation sources require a different piezoelectric ceramic bimorph, for the standing ultrasonic motor (especially the longitudinal torsional composite type), due to the different positions of the longitudinal torsional oscillator in the sandwich stator, the longitudinal torsional vibration propagation speed is different, it is difficult by calculating the phase of the longitudinal torsional oscillator to ensure the phase difference required for the longitudinal torsional vibration of the surface of the piezoelectric ceramic disc transducer. it can only be obtained by the test method. Considering the convenience of the test, the output drive signals of the ultrasonic power supply should be able to be  continuously adjustable within the 1800 range.

Since the ultrasonic motor works under the resonant state, different ultrasonic motors have different resonant frequencies. Even the same ultrasonic motor generally has more than one resonant point. As the temperature changes, the resonant frequency itself will also change. Therefore, the drive signal of piezoelectric ceramic ultrasonic motor is required. The resonant frequency of the general ultrasonic motor is between 20kHz and 100kHz, so the frequency output of the measurement and control system requires 20kHz--100kHz, and the two phases are continuously adjustable. In addition, from the angle analysis of the contacting surface, the two drive voltages must be adjustable.