Patent ID: 8955574
Filing Date: 2015-02-17
Classification: B06B,B23K,B29C,B32B

Abstract:
1. An ultrasonic welding device having a generator for generating a high frequency ac voltage, a converter for converting the ac voltage into a mechanical ultrasonic vibration and a sonotrode for transmitting the ultrasonic vibration to a material to be worked, wherein the converter and the sonotrode are rotatable and a rotary coupler is arranged between the generator and the converter for the transmission of electric energy from a stationary arrangement to a rotating arrangement, with a stationary element and an element which is rotatable relative to the stationary element, wherein the stationary element has a primary circuit with two input terminals which are connected together by way of a first coil with N turns and the rotatable element has a secondary circuit with two output terminals which are connected together by way of a second coil with M turns, wherein the first and second coils are so arranged that when an ac voltage is applied to the input terminals the magnetic field generated by the first coil induces an ac voltage in the second coil, and wherein the primary circuit and/or the secondary circuit has a compensation capacitor connected in parallel or in series in relation to the first or second coil, wherein the compensation capacitor preferably has a capacitance C with the circular frequency ω and the leakage inductance L s .