Brushless d.c. motor
CA 1059211 A · Owner: Danfoss A/S · Inventors: Gosling, Alexander B.; Mealing, Barrie E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification describes a brushless selfstarting D.C. motor which includes a rotor having a permanent magnet, a stator winding the direction of current flow through which is controllable by and responsive to the angular position of the rotor by means of a controllable electronic servo-element in, series with the stator winding at a D . C . source. A magnetic field-dependent component is subject to the rotor magnetic field to determine the angular position of the rotor and a change in the field-dependent component is effective to provide the control signal for the servo-element.
Read the whole patent
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 July 24, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 24, 1996.
- 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.