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.

A PM signal generator can generate a variable PM signal based on a position of a movable element of a MEMS motor. A bias voltage generator can provide a bias voltage to the MEMS motor. The bias voltage generator can include a reference signal generator that can generate a reference signal that varies based on variation of pulses of the PM signal. The bias voltage can be based on the reference signal.

A wearable device that is capable of harvesting kinetic energy from wrist motions using piezoelectric and/or electromagnetic energy harvesters is disclosed. A first part of the device is worn on the user and second part of the device is movable against the second part to accentuate the frequency of movements.

A method of controlling a piezoelectric driving apparatus including a vibration section that has a piezoelectric element and a transmission section that transmits vibration of the vibration section to a driven body, and, by energization of the piezoelectric element, vibrates the vibration section in a combination of longitudinal vibration and bending vibration to cause the transmission section to perform an elliptical motion and to move the driven body by the elliptical motion, the method of controlling the piezoelectric driving apparatus including switching, according to an external force received by the driven body, a drive algorithm of the piezoelectric driving apparatus between a first drive mode in which a separation amplitude, which is an amplitude of the longitudinal vibration, is changed while a feed amplitude, which is an amplitude of the bending vibration, is constant and a second drive mode in which both the feed amplitude and the separation amplitude are changed.

Apparatus and method that includes providing a variable-parameter electrical component in a high-field environment and based on an electrical signal, automatically moving a movable portion of the electrical component in relation to another portion of the electrical component to vary at least one of its parameters. In some embodiments, the moving uses a mechanical movement device (e.g., a linear positioner, rotary motor, or pump). In some embodiments of the method, the electrical component has a variable inductance, capacitance, and/or resistance. Some embodiments include using a computer that controls the moving of the movable portion of the electrical component in order to vary an electrical parameter of the electrical component. Some embodiments include using a feedback signal to provide feedback control in order to adjust and/or maintain the electrical parameter. Some embodiments include a non-magnetic positioner connected to an electrical component configured to have its RLC parameters varied by the positioner.

A stick-slip piezo motor. At least one voltage source is connected to a piezo motor. The piezo motor has at least one oscillating piezo element and at least one moving friction element connected to the oscillating piezo element. The moving friction element moves in a desired travel direction. A computer is programmed to control the voltage source to deliver voltage to the piezo motor at a predetermined frequency and amplitude to control the speed of the piezo motor. The computer is programmed to hold the frequency constant while varying the amplitude to adjust the speed of the piezo motor. In a preferred embodiment the computer is programmed to hold the frequency constant at an ultrasonic frequency. In another preferred embodiment the computer is programmed to hold the frequency constant at a value of 15 kHz or higher.

A piezoelectric device includes a body provided with a first region and a second region lined along a first direction. The first region deformably extends/contracts along the first direction. The second region deformably curves in such a manner that one or the other side in a second direction intersecting the first direction curves outward.

A drive control circuit restores a holding force when a vibrator and a driven body have been left at a standstill for a long time period and when they are used in a high-humidity environment. A drive circuit outputs an alternating-current signal, which is to be applied to an electro-mechanical energy conversion element, based on an output from a control unit. The control circuit controls the drive circuit with first timing such that elliptical motion produced in the vibrator takes a path of which a component parallel to a driving direction of the driven body is large as compared to such a path that a speed at which the driven body is driven is the maximum. The first timing is different from second timing with which relative positions of the vibrator and the driven body are changed.

A method for closed-loop controlling, in particular closed-loop pressure controlling, a piezo valve device, including the steps: calculating a control error integral signal representing a time integral of a control error of the closed-loop control of the piezo valve device, adjusting, based on the control error integral signal, at least one control opening voltage value defining within the closed-loop control an opening voltage value of a piezo valve of the piezo valve device, and using the adjusted at least one control opening voltage value, providing at least one drive voltage for driving the piezo valve within the closed-loop control.

Provided is a vibration type driving device enabling multidirectional driving of a moving body while considering a difference in transfer characteristics of the synthesized driving force of a plurality of motors between at least two mutually crossing directions.