Ultrasonic motor dual pulse-width modulation (PWM) power drive topological structure

Abstract

The invention discloses an ultrasonic motor dual pulse-width modulation (PWM) power drive topological structure, and belongs to the field of ultrasonic motor power drive power sources. The ultrasonic motor dual PWM power drive topological structure is characterized by comprising two PWM components, namely a constant current power supply PWM_POWER component and a power coupling PWM_DRIVE component. The current output end of the constant current power supply PWM_POWER component is connected with the current input end of the power coupling PWM_DRIVE component. The ultrasonic motor dual PWM power drive topological structure achieves quadrature adjustment of output voltage and output frequency without mutual influences of the output voltage and the output frequency, improves impedance matching between an actuator and a load, reduces influences produced by load characteristic impedance changes of ultrasonic motors, and improves energy conversion efficiency of the actuator. The ultrasonic motor dual PWM power drive topological structure plays a key role in achievement for accurate control of the ultrasonic motors.

Description

technical field [0001] The invention relates to a dual-PWM power drive topology structure of an ultrasonic motor, which belongs to the field of ultrasonic motor power drive power supplies. Background technique [0002] Compared with traditional motors, ultrasonic motors have the characteristics of low speed, large torque / mass ratio, fast response, power-off self-locking, nanoscale resolution, and no electromagnetic interference. [0003] Ultrasonic motors need to be driven by two quadrature phase ultrasonic frequencies provided by the ultrasonic motor driver. Currently, there are output stages of ultrasonic motor drivers. For example: the invention patent "based on embedded system-level chip ultrasonic motor drive controller (application date October 23, 2007, application number 200710134453.3)" discloses an output stage of an ultrasonic motor, which uses a single PWM drive, series Matched power drive topology. The advantage is that the structure is simple, but there are ...

AI Technical Summary

Problems solved by technology

The advantage is that the structure is simple, but there are disadvantages such as large interaction between the adjustment of the output voltage and the output frequency, poor matching effect, large influence of the dynamic impedance of the ultrasonic motor, and low energy conversion efficiency.

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