Drive circuit for a brushless motor
CA 1107815 A · Owner: Sony Corporation · Inventors: Sato, Toshio; Hoshimi, Susumu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drive circuit for a brushless motor which includes rotor position sensors for generating varying signals corresponding to the rotary position. Amplifier stages are coupled to the position sensors, the amplifier stages being responsive to the position signals produce drive currents which are supplied to the stator windings. In one embodiment each amplifier, stage includes a voltage amplifier having a linear gain characteristic for amplifying the position signal applied thereto a current amplifier connected in cascade with the voltage amplifier and responsive to the amplified position signal to produce a drive current. A feedback circuit is interconnected between the output of the current …
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 August 25, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 25, 1998.
- 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.