To improve the output performance of piezoelectric linear motors, researches was carried on the vibration characteristic for the stator of dynamic-friction type non-resonant linear piezoelectric motors. By analyzing the construction and working mechanism of the motor, longitudinal vibration model was established for the stator of motor. Then the vibration differential equation of the drive tip was deduced and longitudinal displacement functions were proposed. Further, the prototype was fabricated and investigated by experiments on the longitudinal displacement of drive tip under different excitation conditions. Experiment results proved the vibration characteristic theory of stator that the longitudinal amplitude of drive tip increases with excitation voltage. The maximum amplitude of drive tip is 0.85μm and the output force is 3 N on condition that the operation voltage is 90 V and the frequency is 1.6 kHz. The above studies can provide theoretical basis for performance optimization of motor and for structural optimization of stator.
The design of a new driver for piezoelectric linear motor using double driving feet. According to the requirements of this kind piezoelectric motor driving voltage. The power supply (AC-DC) based on IR2153 is designed. The output voltage of the power supply is 110 V. The embedded chip is used as the main processor, provide the signal for motor driving. And through the appropriate configuration, Design of a PGA circuit based on a programmable resistance circuit, and the energy amplification adopts half-bridge inverter topology. Realized the goal of both voltage and frequency are controlled. The whole power consumption of the circuit is stabile, the experimental effect is good, and it's small, and good applicability.
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