Method of controlling the speed of a d.c. motor and device...

Details Method of controlling the speed of a d.c. motor and device... Method of controlling the speed of a d.c. motor and device...

Category

H - Electricity

Subcategory

02

Subsubcategory

P

CPC

318/108

IPC codes

H02P 7/14 (2006.01) H02P 7/288 (2006.01)

Type

Patent

Patent number

CA 1186368

Description

ABSTRACT: A device for controlling the speed of a d.c. motor (M), which device employs a method in accordance with which the motor supply voltage (V) is controlled by a control voltage (Vo) supplied by a comparator circuit which compares a reference signal (Sref) with a signal (SV) representing the speed of the motor (M), which signal (SV) is derived from a signal (SM) induced by the motor rotation via a signal processing circuit. According to the invention the motor supply voltage (V) is controlled by the control voltage (Vo) by means of a circuit having a "negative resistance" (-R), which circuit at least partly compensates for the internal resistance (r) of the motor. The device is employed in magnetic-tape sound recording and reproducing equipment, especially in equip- ment to be installed in motor-cars.

Application Number

406853

Affiliated with

Also associated with

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