Ac motor drive apparatus
CA 1293529 C · Owner: Tanaka, Shigeru · Inventors: Tanaka, Shigeru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An AC motor drive apparatus comprising a DC/AC power converter having a DC terminal coupled to a DC power source; a capacitor coupled to an AC terminal of said DC/AC power converter; a circulating current cycloconverter having an input terminal coupled to said capacitor and an output terminal coupled to an AC motor; a first control means coupled to said DC/AC power converter, responsive to a predetermined crest value Vcap* to, control said DC/AC power converter such that a crest value Vcap of a voltage on said capacitor substantially matches said predetermined crest value Vcap*; and a second control means coupled to said cycloconverter, responsive to a current supplied from said …
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 December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 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.
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.