Abstract:
Methods of mitigating current overload of an ultrasonic system having an ultrasonic stack under load at startup are provided. The methods include beginning an ultrasonic cycle in the ultrasonic system having the ultrasonic stack that runs a closed loop phase control through the weld cycle by ramping up the power of the ultrasonic stack under load. During ramping up of the power of the ultrasonic stack under load, a controller lowers the phase to a negative phase. After ramping up the power of the ultrasonic stack under load is complete, the controller raises the phase to 0 degrees and the ultrasonic stack is operating at steady state and with the phase at 0 degrees.
Abstract:
Bei einem Verfahren zum Betrieb einer Ultraschallbohrmaschine, insbesondere einer handgeführten Ultraschallbohrmaschine (100), zum materialabtragenden Bearbeiten eines Werkstücks (166), insbesondere eines im Wesentlichen mineralischen Werkstücks (166), mittels eines von einer Antriebseinheit (130) der Ultraschallbohrmaschine (100) rotatorisch angetriebenen Einsatzwerkzeugs (160), wobei einer Rotationsbewegung des Einsatzwerkzeugs (160) eine mittels eines Schwingungsaktors (105) der Antriebseinheit (130) erzeugte, longitudinale Ultraschallschwingung (110) überlagerbar ist, wird die Ultraschallschwingung (110) mittels einer Steuereinrichtung (200) der Ultraschallbohrmaschine (100) moduliert.
Abstract:
A system and downhole tool comprising an ultrasonic transducer with a piezoelectric material embedded in a backing and a method of determining a parameter using the ultrasonic transducer, A self-noise of the transducer can be reduced by the piezoelectric material being at least partially embedded in the backing. The ultrasonic transducer can include an encapsulating material that encapsulates the backing.
Abstract:
An acoustic transmitter for transmitting an acoustic signal through a downhole medium includes a voltage source; a composite load; and switching circuitry that applies voltage from the voltage source across the composite load in response to a drive signal. The composite load includes charge control circuitry, in the form of at least one inductor, connected electrically in series with a piezoelectric transducer that may be electrically modeled as a capacitor.