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1. (WO1987003753) D.C. MOTOR CONTROL SYSTEM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1987/003753 International Application No.: PCT/US1986/002533
Publication Date: 18.06.1987 International Filing Date: 24.11.1986
IPC:
G05F 1/613 (2006.01) ,H02P 7/288 (2006.01)
G PHYSICS
05
CONTROLLING; REGULATING
F
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
1
Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
10
Regulating voltage or current
46
wherein the variable actually regulated by the final control device is dc
613
using semiconductor devices in parallel with the load as final control devices
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
P
CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS OR REACTORS OR CHOKE COILS
7
Arrangements for regulating or controlling the speed or torque of electric dc-motors
06
for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
18
by master control with auxiliary power
24
using discharge tubes or semiconductor devices
28
using semiconductor devices
285
controlling armature supply only
288
using variable impedance
Applicants:
NCR CORPORATION [US/US]; World Headquarters Dayton, OH 45479, US
Inventors:
SINGH, Amar, Jit; US
Agent:
DUGAS, Edward @; Intellectual Property Section Law Department/NCR Corporation World Headquarters Dayton, OH 45479, US
Priority Data:
809,68016.12.1985US
Title (EN) D.C. MOTOR CONTROL SYSTEM
(FR) SYSTEME DE COMMANDE DE MOTEURS A COURANT CONTINU
Abstract:
(EN) In a D.C. motor control system, a D.C. motor drives a cooling fan for data processing equipment, the speed of the fan motor being controlled in accordance with the temperature sensed by a temperature sensor (50). A D.C. power supply (10) supplies power for the D.C. motor and the data processing equipment. The current through the motor is sensed by a sensor (42) to provide a control signal to a compensating circuit (41) which generates a compensating current (mirror image current) such that the total current drawn for the D.C. power supply (10) by the D.C. motor and the compensating circuit (41) remains substantially constant. This avoids voltage fluctuations in the D.C. power supply (10) which could undesirably affect the operation of the data processing equipment.
(FR) Dans un système de commande de moteurs à courant continu, un moteur à courant continu entraîne un ventilateur de refroidissement pour un équipement de traitement de données et la vitesse du moteur d'entraînement du ventilateur est régulée en fonction de la température détectée par un capteur de température (50). Une alimentation à courant continu (10) alimente le moteur à courant continu et l'équipement de traitement de données. Le courant traversant le moteur est capté par un capteur (42) qui envoie un signal de commande à un circuit compensateur (41) produisant un courant de compensation (courant d'image spéculaire) de sorte que la totalité du courant absorbé par le moteur à courant continu et par le circuit compensateur (41), tiré de l'alimentation à courant continu (10), reste essentiellement constant. Cela permet d'éviter les fluctuations de tension dans l'alimentation à courant continu (10) qui pourraient affecter négativement le fonctionnement de l'équipement de traitement de données.
Designated States: JP
European Patent Office (DE, FR, GB)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0252095JP7087718