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Expired Canadian patentCanada

Reluctance motor having h-shaped stator cores

CA 1284518 C · Owner: Polestar Magnetronics Inc. · Inventors: Kaszmann, John

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

An electric motor operating on the reluctance principle employs spaced rotor discs presenting rings of inwardly facing poles of alternating polarity typically, by means of permanent magnets and an annular stator, between the discs consisting of a ring of H shaped cores with the stems of the H's extending peripherally. Two sets of windings on these cores are energized alternately so as to provide alternating polarization of pole pieces presented by the cores to the rotor discs with a timing, such as to produce continuous rotation at a controlled rate, of the discs as their magnets seek a minimum reluctance position.

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted May 28, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 20, 1988
GrantedMay 28, 1991
Term endedMay 28, 2008
Patent numberCA 1284518 C
Classification (IPC)H02K29/00 +2 more

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedJuly 20, 1988Patent grantedMay 28, 1991Term endedMay 28, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.