MOTOR CONTROL DEVICE

• Main Authors: ISOMURA TOSHIAKI, KAWAKURA HIROKO
• Format: Patent
• Language: English
• Published: 31.01.2002
• Edition: 7
• Subjects: CHAIRS FOR DENTISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; FUNERAL DEVICES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; HUMAN NECESSITIES; HYGIENE; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MEDICAL OR VETERINARY SCIENCE; OPERATING TABLES OR CHAIRS; PERFORMING OPERATIONS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORT OR ACCOMODATION FOR PATIENTS; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To detect a current that flows in a motor with high accuracy using a simple circuit structure. SOLUTION: When a motor 9 stops, a fail-safe driving signal FS turns off a relay 29 to break a power source voltage VB. When the motor 9 operates, the signal FS turns on the relay 29 to supply power to a driver 22 and also turns on transistors 34, 36 to supply the voltage VB. The voltage to the transistor 35 is divided by resistors 43, 44 and is turned on by a voltage delayed by the time constant of the resistor 43 and a capacitor 38 to output a detection signal. This detection signal causes a microcomputer 15 to output a driving signal to a pre-driver 20. The resistance of the resistors 43, 44 are set, in such a way as to turn on the transistor 35, if the delayed voltage is hither than the minimum operating voltage of a motor current sensor 24. As the delay time, a time is set that is required, until the operation of the sensor 24 becomes stable after the supply of the power source voltage VB.