INVERTER FOR THREE-PHASE BRUSHLESS DC MOTOR

PROBLEM TO BE SOLVED: To provide an inverter of three-phase brushless DC motor, which can detect currents with high accuracy, without using current sensor. SOLUTION: A current detecting section 7 detects voltage drops in three current detecting resistor elements 6a, 6b, and 6c, respectively installe...

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Bibliographische Detailangaben
Hauptverfasser:	KITAMINE KOTA, FURUTA SHIGEKI
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an inverter of three-phase brushless DC motor, which can detect currents with high accuracy, without using current sensor. SOLUTION: A current detecting section 7 detects voltage drops in three current detecting resistor elements 6a, 6b, and 6c, respectively installed between lower arm-side switching elements 5d, 5e, and 5f and a low-order DC power supply line 10. Consequently, the required band width for a circuit can be compressed significantly, as compared with the conventional resistor type current detection system.