Patent application number | Description | Published |
20090146529 | STARTING-PROCESS CONTROLLER FOR STARTING A PIEZOMOTOR - A starting-process controller for starting a piezomotor, having a voltage-controlled oscillator, a power output stage, and a resonant converter. The oscillator generates the control signals required for the power output stage and the resonance converter converts the stepped output voltage from the power output stage into a sinusoidal voltage at the output. The resonance converter drives the piezomotor with the voltage. The motor current that flows when the piezomotor is driven is measured and compared with the phase of the drive voltage in a phase comparator. The comparison output signal is a measure of the phase difference at the time between current and voltage. A phase-locked loop filter smoothes the phase-difference signal for controling the oscillator. The controller includes a start-assisting circuit element that fixes the output voltage from the phase-locked loop filter at start-up and thus applies a constant voltage to the input of the voltage-controlled oscillator. | 06-11-2009 |
20100019620 | PIEZOCERAMIC MULTILAYER ACTUATOR AND METHOD FOR ITS PRODUCTION - In a piezoelectric multilayer actuator ( | 01-28-2010 |
20100102138 | PIEZOELECTRIC COMPONENT COMPRISING A SECURITY LAYER AND AN INFILTRATION BARRIER AND A METHOD FOR THE PRODUCTION THEREOF - A piezoelectric component with a monolithic stack, has electrode layers and piezoceramic layers arranged alternately one on top of the other, the piezoceramic layers have a piezoceramic, and having at least one porous security layer arranged in the stack for the formation of a crack if mechanical overload of the stack should occur. The piezoelectric component has an infiltration barrier arranged between the security layer and a lateral surface section of the stack for suppressing the penetration of a foreign substance into the security layer. The piezoelectric component can be as a piezoactuator for controlling a valve, particularly a valve of an internal combustion engine. | 04-29-2010 |
20100268440 | METHOD AND DEVICE FOR THE CALIBRATION A PIEZO-ACTUATOR THAT IS ACTUATED IN A MOTOR VEHICLE FOR DRIVING A SWITCHING VALVE - In a method for calibration, a piezo-actuator ( | 10-21-2010 |
20100325854 | METHOD FOR POLARIZING A PIEZOCERAMIC MATERIAL - In a method for polarizing a piezoceramic material, first, a base is provided that is made of non-polarized piezoceramic material and has at least two opposite planar electrodes and at least one predetermined breaking point because of which a stress relief fracture forms when a voltage having a first voltage value is applied. A number of voltage pulses, the amplitudes of which follow a time-related envelope curve, is applied to the electrodes of the base. The amplitudes of the voltage pulses in a first section of the envelope curve are higher than the first voltage value, and the amplitudes of the voltage pulses in a second section of the envelope curve that follows the first section have a second voltage value which is sufficient to permanently polarize the piezoceramic material. | 12-30-2010 |
20110279066 | Method and Device for Controlling a Solid Body Actuator - In a discharge process of the solid body actuator ( | 11-17-2011 |
20130248623 | Piezoelectric Component with Contact - A piezoelectric component, e.g., for use as an actuator of a fuel injection valve in a motor vehicle, may include a stack-shaped actuator body including a plurality of piezoelectric elements and inner electrode layers arranged in an alternating manner in a stacking direction, each inner electrode layer being connected alternately to one of two metalizations on an outer face of the stack in an electrically conductive manner. Each metalization is connected to an electrically conductive electrode structure via an electrically conductive contacting element (e.g., adhesive or solder). The stack-shaped actuator body has at least one predetermined breaking point, and the metalizations and/or the contacting elements have a recess in the region of the at least one predetermined breaking point. | 09-26-2013 |