专利名称：METHOD AND CIRCUIT ARRANGEMENT FOR
DETERMINATION OF THE ROTOR POSITIONOF A BRUSHLESS DC MOTOR WITHOUTSENSORS
发明人：HEIDRICH, TORSTEN,FASSNACHT, JOCHEN申请号：EP05803443.0申请日：20051108公开号：EP1834401A1公开日：20070919
摘要：The invention relates to a method and a circuit arrangement for determinationof the rotor position of a brushless DC motor (10) without sensors and to operationthereof with a rotor (12) preferably energized with permanent magnets and a preferablythree-phase armature winding (14) with a star connection and a controller (26) for asemiconductor switching device (24) for the successive connection of the windings of theDC motor (10) to a DC supply (16, 18), depending on the rotor position. According to theinvention, the controller (26) is supplied with a trigger signal (58), derived from the phase-summated current (I) for the motor (10) to fix the timepoints for the recording ofreference values of the voltages (Ui) induced in the individual phases as the time
condition for the generation of the commutation signal for the semiconductor switchingdevice (24). The output signal from a summator (34, 36, 38) from the difference of eachphase voltage (Ux) and the star point voltage (Us) is compared in a subsequent
comparator (40, 42, 44) with a voltage value for the voltage drop generated by a givenphase current (Iref) across the internal resistance of the phase and the induced voltages
(Uix) and the zero transition points thereof determined therefrom.
申请人：ROBERT BOSCH GMBH
地址：Postfach 30 02 20 70442 Stuttgart DE
国籍：DE
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