DRIVER OF BRUSHLESS DC MOTOR

PROBLEM TO BE SOLVED: To drive a rotor smoothly without using a pole position detector such as a Hall sensor by a method wherein stator winding current waveform patterns corresponding to various types of loads are stored beforehand and a detected current waveform pattern is compared with the stored...

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Bibliographic Details
Main Author ENDO SHINSUKE
Format Patent
LanguageEnglish
Published 06.06.1997
Edition6
Subjects
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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Summary:PROBLEM TO BE SOLVED: To drive a rotor smoothly without using a pole position detector such as a Hall sensor by a method wherein stator winding current waveform patterns corresponding to various types of loads are stored beforehand and a detected current waveform pattern is compared with the stored waveform patterns and, in accordance with the comparison result, a pulse voltage supplied to the winding is adjusted. SOLUTION: A three-phase power supply 1 is rectified and smoothed to obtain a DC voltage which is chopped by power semiconductor devices 4a 4f and supplied to the stator windings 6 of a DC motor 5 and a rotor 7 is synchronized with rotary magnetic fields of the stator side to rotate. In a driver like this, a load current is detected by a current detecting resistor 11 and inputted to a microprocessor 8 and stored temporarily in a memory device 12. The load current waveform pattern is compared with current waveform patterns which correspond to various types of loads and are stored in a ROM 9 and the power semiconductor devices 4a-4f are operated in accordance with the comparison result. With this constitution, the step out caused by the load fluctuation can be avoided and the brushless DC motor 5 can be driven stably.
Bibliography:Application Number: JP19950325015