Stepping motor control circuit
CA 1095584 A · Owner: Teletype Corporation · Inventors: Stephens, Dennis L.; Feldy, Edmund C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Feldy-Stephens - 3-2, STEPPING MOTOR CONTROL CIRCUIT ABSTRACT OF THE DISCLOSURE, A stepping motor is described having two operative modes, the first mode being a normal rotary mode and the second a stationary mode. during rotary operation the, induced energy created by interruption of the current flow through the energized phase winding is dissipated quickly by a zener diode connected across the winding. In the stationary mode, a pulsed current is fed to one of the phase windings of the motor to assure stationary positioning of the rotor. During stationary operation the zener, diode is shunted with a second conventional diode providing a low impedance path to the current induced in the …
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 February 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 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.