DE3247046

• Main Authors: LJUNG, ERIK ANDERS, STOCKHOLM, SE, HARTWIG, CARL SVERKER MAGNUSSON, TAEBY, SE
• Format: Patent
• Language: English
• Published: 14.09.1989
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; BORING; CHAIRS FOR DENTISTRY; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROL OR REGULATION THEREOF; CONTROLLING; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; FUNERAL DEVICES; GENERATION; HAND TOOLS; HUMAN NECESSITIES; HYGIENE; MACHINE TOOLS; MANIPULATORS; MEDICAL OR VETERINARY SCIENCE; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MILLING GRAIN; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; OPERATING TABLES OR CHAIRS; PERCUSSIVE TOOLS; PERFORMING OPERATIONS; PHYSICS; PORTABLE POWER-DRIVEN TOOLS; PREPARATORY TREATMENT OF GRAIN FOR MILLING; REGULATING; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORT OR ACCOMODATION FOR PATIENTS; TRANSPORTING; TURNING

A method and a means for feeding electric energy to a portable power tool is based on a principle according to which the brushless AC motor of the tool is individually supplied with power from a solid state inverter type power supply by which the amplitude and frequency of the AC current are automatically and individually adapted to the instantaneous load conditions experienced by the motor.