Method and circuit for driving stepping movement of piezoelectric ultrasonic motor
A technology of ultrasonic motor and drive circuit, which is applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., which can solve the problem of large step distance, long vibration attenuation time and low resolution and other problems, to achieve the effect of rapid attenuation, reduced step distance and response time
Pending Publication Date: 2019-04-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
There are some deficiencies in the above-mentioned conventional stepping driving method: there is a contradiction between the driving force, the step distance and the response time (in order to obtain a large driving force, the stator needs to have a large amplitude, and the corresponding vibration attenuation time is long, and the step distance larger, lower resolution)
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[0013] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.
[0014] figure 1 Shown are schematic diagrams of the conventional driving method (regulation without damping) and the driving method of the present application (regulation with damping) in the stepping motion mode of the ultrasonic motor. At the moment t when the excitation voltage ends 1 , the amplitude of the stator of the ultrasonic motor reaches the maximum value. If the ultrasonic motor is not controlled, the vibration of the motor stator will take a long time (t Decay = t 2 -t 1 ) gradually decays until it stops; if at t 1 After the time, disconnect the stator piezoelectric ceramic sheet from the power amplifier, and connect the damping energy-consuming circuit, the vibration of the...
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The invention discloses a method and a circuit for driving stepping movement of a piezoelectric ultrasonic motor, the driving circuit comprises a signal generator, a power amplifier, a bilateral switch, a damping circuit and control signals, wherein the bilateral switch is formed through combination of two electronic switches; the damping circuit is used for dissipating the mechanical vibration energy of the piezoelectric ultrasonic motor; the control signals are used as triggering signals of the signal generator and control signals of the two electronic switches; when the control signals areof high levels, the piezoelectric ultrasonic motor and the power amplifier are connected by the bilateral switch, the piezoelectric ultrasonic motor is disconnected with the damping circuit, the signal generator generates sine driving signals, the sine driving signals are applied to the piezoelectric ultrasonic motor after voltage amplification through the power amplifier, and the piezoelectric ultrasonic motor is started to work; when the control signals are of low levels, the piezoelectric ultrasonic motor is disconnected with the power amplifier by the bilateral switch, the piezoelectric ultrasonic motor is kept in connection with the damping circuit, and the mechanical vibration energy of the piezoelectric ultrasonic motor is rapidly dissipated. According to the method and the circuitfor driving stepping movement of the piezoelectric ultrasonic motor, the resolution ratio and the response time characteristics of the stepping movement of the piezoelectric ultrasonic motor are improved favorably.
Description
technical field [0001] The invention belongs to the technical field of precision driving of ultrasonic motors, in particular to a driving method and circuit for stepping motion of piezoelectric ultrasonic motors. Background technique [0002] Compared with traditional motors, ultrasonic motors have the following characteristics: simple structure, compact structure, large torque / mass ratio; low-speed high-torque, no gear reduction mechanism, and direct drive; fast response (milliseconds); power-off self-locking ; High resolution, high precision can be obtained under closed-loop control (less than 100nm, some ultrasonic motors with special structures can reach motion accuracy below 10nm); no magnetic field is generated, and it is not disturbed by external magnetic field; the shape can be diversified (round, square, hollow, rod-shaped), etc. Due to its excellent performance, ultrasonic motors can replace electromagnetic motors in many occasions, and have broad application pros...
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Login to View More IPC IPC(8): H02N2/06
CPCH02N2/06
Inventor 郭明森潘松
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS