| 摘要 |
PROBLEM TO BE SOLVED: To attain detection of sensor-less electrical angle, by calculating the behavior of ideal current in switching with no dead time, between the mutual behavior of current where the behavior of current flowing through a prescribed phase of a coil winding according to the applied voltage of the coil winding of a motor is detected at a plurality of times of timing, and the behavior of ideal current, and computing an electrical angle. SOLUTION: A voltage applying part 130 for applying voltage between respective coils in order to obtain respective phases of current of a motor 40 inputted separately is provided at an output part in a controlling ECU 100 equipped with a microprocessor CPU 120 for arithmetic operation. The control outputs Gu to Gw and SD from the CPU 120 are outputted in the voltage applying part 130, and the voltage applied to the coil of the motor can be controlled from the outside. The detection of current may be conducted by detecting its behavior three times or more at the completion of forward voltage application and reverse voltage application. It is thus possible to eliminate the dispersion of switching elements and the effect of temperature or secular change thereof, that is, the effect of dead time. |
