Brushless asynchronous alternating current machine controllable by secondary excitation
CA 1251255 A · Owner: Hitachi, Ltd. · Inventors: Niwa, Sadahiko; Okuyama, Toshiaki; Sasamoto, Hisaya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, A brushless induction motor comprises an eight pole three-phase stator winding, a four pole three-phase stator winding overlapping the eight pole three-phase stator winding, and a rotor winding facing and coaxial with the eight pole and four pole three-phase stator windings and formed of six unitary windings. The six unit windings are uniformly arranged with respect to the eight pole and four pole three-phase stator windings. Each unitary winding includes a coil having six turns. The first end terminals of the coils of six unitary windings are connected to a first end ring and the other end terminals thereof are connected to a second end ring. The rotating speed of the brushless …
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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 March 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 14, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.