John J Cestra

US Patent:

6980450, Dec 27, 2005

Filed:

Jun 15, 2001

Appl. No.:

09/882188

Inventors:

Suresh K. Bhate - Niskayuna NY, US
John Cestra - Delanson NY, US
Christopher B. Harrington - Nassau NY, US
Leo Hoogenboom - Jonesville NY, US

Assignee:

Inverters Unlimited, Inc. - Schenectady NY

International Classification:

H02M007/538

US Classification:

363134, 363 26

Abstract:

A compact high-power pure-sinewave inverter amenable to mass manufacturing techniques. Methods for increasing the power rating, power density and/or power conversion efficiency of a sinewave-modulated pulse-width-modulated (PWM) inverter having a either half-bridge or full-bridge topology, including minimizing uncoupled inductances and loop inductances in the primary winding(s) by employing either ribbon-like conductors having a high crossectional aspect ratio or litz-wire. A compact linear heatsink adapted to cool a row of semiconductor devices (such as inverter switches) mounted on a high-current printed circuit board. Methods for inexpensive manufacture of a fluid-cooled linear heat sink. A transformer including a filter inductor core.

US Patent:

51967499, Mar 23, 1993

Filed:

Sep 23, 1991

Appl. No.:

7/763632

Inventors:

Rodolfo Palma - Troy NY
John J. Cestra - Delanson NY

Assignee:

REM Technologies, Inc. - Schenectady NY

International Classification:

H02K 106

US Classification:

310217

Abstract:

A support and positioning structure for a stator assembly of an inductor type dynamoelectric machine is disclosed. The stator assembly includes a plurality of stationary C-shaped armature elements circumferentially located about a central longitudinal axis and supported by end portions. The C-shaped armature elements include armature windings on a base portion extending parallel to the longitudinal axis and legs extending from each end in a radially inward direction. The support structure includes a nonmagnetic ring shaped member sized to be insertable over the bases of the circumferentially spaced C-shaped armature elements. The bases are in contact with an inner portion of the ring shaped member to thereby position the C-shaped armature elements. The ring shaped member may provide improved cooling effects if made of a heat conductive material and may allow air gap tolerances within the stator assembly to be minimized.