A method for operating a drive unit having an active element with a resonator and an excitation structure for exciting oscillations in the resonator and thereby driving a passive element. The method includes driving the excitation structure with a driving signal, the driving signal being a periodic signal having driving pulses repeated with an excitation frequency. Depending on a control signal, modifying the driving signal, if the control signal is within a first range, by modifying the excitation frequency or modifying the shape of the driving pulses and, if the control signal is within a second range, repeatedly omitting driving pulses.

A zero-voltage zero-current soft switching type driving method for an ultrasonic motor is provided, relating to the technical field of driving of a two-phase actuator. The disclosure solves the problems of high loss, high heat amount and the like in a traditional ultrasonic motor driving circuit. The method provided realizes resonance between series inductors and buffer capacitors by means of an optimal design of the inductance of matching inductors, the capacitance of buffer capacitors, a dead time value and a delay time value, thereby causing a power tube to realize zero-voltage and zero-current switching. Two signal input ends of a two-phase pseudo full bridge inverter are connected to a power grid, and two signal output ends of the two-phase pseudo full bridge inverter are respectively connected to two signal input ends of a matching circuit; and the output ends of the matching circuit are respectively connected to a two-phase ultrasonic motor.

An iterative learning-based energy-saving control method for a piezoelectric motor, comprising: setting a sampling period of a piezoelectric motor (101); obtaining an expected output trajectory of the piezoelectric motor, and performing sampling according to the sampling period to obtain a sampled expected output sequence (102); setting an initial control input signal of the piezoelectric motor (103); obtaining an actual control input signal according to a mapping relation of the initial control input signal, and transmitting the actual control input signal to the piezoelectric motor to obtain an actual output position (104); obtaining a mapping relation of the output position of the piezoelectric motor according to the actual output position, and sampling the mapping relation according to the sampling period to obtain a sampled actual output sequence (105); calculating the difference between the sampled expected output sequence and the sampled actual output sequence to obtain a sampling error function sequence (106); obtaining an iterative learning gain parameter by calculation according to a preset convergence condition (107); and obtaining, by calculation according to the sampling error function sequence and the iterative learning gain parameter, an iterative input voltage required by iteration of the piezoelectric motor, and transmitting the iterative input voltage to the piezoelectric motor (108).

A vibration wave motor includes a vibrator including a piezoelectric element and a vibratory plate, a friction member configured to make a frictional contact with the vibrator, a pressurizer configured to press the vibrator and the friction member against each other, and a guide unit configured to guide a relative movement between the vibrator and the friction member. The guide unit includes a plurality of rollers configured to move relative to the pressurizer, and a guide member that includes a guide portion, the guide portion being configured to extend along a relative movement direction between the vibrator and the friction member and to guide the plurality of rollers. The guide member includes a reinforcer configured to extend along the relative movement direction near a roller closest to a center position of a pressing force by the pressurizer.

Provided is a vibration wave driving apparatus comprising: a vibration actuator; and a driven member configured to be driven by the vibration actuator, wherein the vibration actuator includes: a vibrator having an electric-mechanical energy conversion element and an elastic member to which the electric-mechanical energy conversion element is fixed; a pressurizing member configured to pressurize the vibrator; a contacting member configured to pressurizing-contact with the vibrator by pressurizing the vibrator by the pressurizing member and move relative to the vibrator; an outputting member configured to output a driving force to the driven member, the driving force generated by the relative-moving of the contacting member to the vibrator, and wherein the driven member includes an output transmission member configured to hold the outputting member in a direction of the relative-moving with a predetermined spring force.

A lens apparatus includes a base barrel, a lens movable to an object side and an image side relative to the base barrel, an actuator configured to move the lens, a drive board that includes an electric element configured to drive the actuator, and a board holding member configured to hold the drive board and attached to the base barrel from the object side.

A piezoelectric driving device includes a piezoelectric vibrating body and a driving circuit. The piezoelectric vibrating body includes a contact which extends in a first direction and comes into contact with a driven member, a first piezoelectric element which generates bending vibration in a direction intersecting with the first direction in accordance with a first driving voltage, and a second piezoelectric element which generates longitudinal vibration in the first direction in accordance with a second driving voltage. The piezoelectric vibrating body is configured such that a resonance frequency of the longitudinal vibration is higher than a resonance frequency of the bending vibration. The driving circuit sets a driving frequency of each of the first driving voltage and the second driving voltage to be equal to or higher than the resonance frequency of the longitudinal vibration.

A driving mechanism is provided, including a base, a movable unit, a magnetic element, and a driving assembly. The movable unit is movably disposed on the base. The magnetic element is disposed on the movable unit and has plastic material. The driving assembly is configured to drive the movable unit to move relative to the base, wherein the driving assembly has a coil, and the magnetic element and the movable unit move relative to the base when an electrical current is applied to the coil.

An optical element driving mechanism is provided, including a fixed part, a movable part, and a driving assembly. The movable part includes a holder, and a supporting element. The holder holds an optical element. The supporting element is connected to the holder. The driving assembly drives the movable part to move relative to the fixed part. The holder uses the supporting element as a fulcrum and moves relative to the fixed part around the first axis and the second axis. The first axis is not parallel to the second axis.

The present application provides a motor and an electronic device, where the motor includes a housing, a first electric vibration part, and a mass block; an accommodating cavity is disposed in the housing, the first electric vibration part and the mass block are disposed in the accommodating cavity, a first end of the first electric vibration part is connected to the housing, and a second end of the first electric vibration part is connected to the mass block; and when a voltage is applied to the first electric vibration part, the first electric vibration part drives the mass block to move.