Abstract: A method of making generally symmetrical lamination stacks for electrical machines comprises producing generally symmetrical pole tips from alternating asymmetrical pieces that each have an additional layer in the asymmetrical portion. With the alternating asymmetrical pieces combined, the resulting pole tip is generally symmetrical with a larger possible pole tip width compared with currently-used interleaved stamping techniques.
Type:
Grant
Filed:
December 4, 2012
Date of Patent:
April 25, 2017
Assignee:
Fisher & Paykel Appliances Ltd.
Inventors:
Gregory P. Hill, John Julian A. Williams, Gerald D. Duncan, Kerrin E. Burnnand, Mark G. Benson
Abstract: A method of making generally symmetrical lamination stacks for electrical machines comprises producing generally symmetrical pole tips from alternating asymmetrical pieces that each have an additional layer in the asymmetrical portion. With the alternating asymmetrical pieces combined, the resulting pole tip is generally symmetrical with a larger possible pole tip width compared with currently-used interleaved stamping techniques.
Abstract: The present invention relates to a washing machine (7) and pump (8) for a washing machine (7). The pump is driven by a brushless DC motor (38). The pump can be controlled to improve the operation of the washing machine. In one aspect the invention comprises a washing machine (7) with a variable speed pump (8) for pumping out wastewater, a controller (50) for controlling the speed of the pump and a sensor (10) for determining the flow-rate of water being pumped from the washing machine, wherein the controller (50) controls the speed of the pump to maintain the flow-rate at a desirable level.
Type:
Grant
Filed:
November 6, 2006
Date of Patent:
October 12, 2010
Assignee:
Fisher & Paykel Appliances Ltd.
Inventors:
Jonathan David Harwood, Hugh Griffith Johnson, Geoffrey Alan Lee, Gregory Paul Hill, Anna Kathryn Duncan, Adrian Anthony Sargeant