The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1983
Filed:
Mar. 13, 1981
Albert E Sloan, Gateshead, GB;
Technical Operations Limited, Gateshead Nell, GB;
Abstract
A pulse control circuit for a three-terminal d.c. series motor having an armature and two oppositely-wound field windings comprises a respective main thyristor in series with each field winding, one or other of the main thyristors being operated at a variable mark-to-space ratio to energize the field winding appropriate to drive the motor in a selected direction. The circuit includes switch means operable to connect the motor in a regenerative braking mode in which the armature and each field winding are connected to the battery in series with a freewheel diode and with a diode across the motor so that charging current can flow from the motor to the battery during regenerative braking. Circuit means are provided to effect initial energization of at least one field winding when the circuit is first switched to the regenerative braking mode.