Abstract: A variable inductor which avoids electrical breakdown of the insulation in the control windings when used in high power applications includes a core formed of a permeable magnetic material, the core having three legs, including a center leg and two outer legs. A main winding element comprising a main conductor is wound around the center leg of the core. A control winding element comprising a control conductor is wound in a figure-eight configuration having a first winding and a second winding around respective outer legs, the winding configuration canceling induced voltages in the first and second windings, wherein a current through the control winding element causes a change in inductance of the main winding element.
Type:
Grant
Filed:
February 4, 2004
Date of Patent:
July 10, 2007
Assignee:
Paper Quality Management Associates
Inventors:
John E. Poniatowski, John W. Walkinshaw
Abstract: A resonant chamber that produces an ultrasonic energy field about a central axis of the chamber to separate contrary matter from a working material. The resonant chamber has a circular cross section and utilizes a series of transducer elements to generate an ultrasonic transverse wave disposed about the internal longitudinal axis of the chamber. In addition, a driver circuit is provided that is able to efficiently excite the transducer elements to generate the ultrasonic transverse wave with a minimum of heat dissipation and power loss.
Type:
Grant
Filed:
March 2, 2001
Date of Patent:
May 18, 2004
Assignee:
Paper Quality Management Associates
Inventors:
John Eugene Poniatowski, Susan Elizabeth Poniatowski, John William Walkinshaw
Abstract: A resonant chamber that produces an ultrasonic energy field about a central axis of the chamber to separate contrary matter from a working material. The resonant chamber has a circular cross section and utilizes a series of transducer elements to generate an ultrasonic transverse wave disposed about the internal longitudinal axis of the chamber. In addition, a driver circuit is provided that is able to efficiently excite the transducer elements to generate the ultrasonic transverse wave with a minimum of heat dissipation and power loss.
Type:
Application
Filed:
March 2, 2001
Publication date:
September 5, 2002
Applicant:
Paper Quality Management Associates
Inventors:
John Eugene Poniatowski, Susan Elizabeth Poniatowski, John William Walkinshaw