The invention is driven by the space voltage vector that three-phase inverter of a pulse width modulation output, the position sensor and the brush is not the brushless DC motor in the way the initial electrical angular position of the rotor of (BLDC motor) estimated and starting method It relates. ; Initial electrical angular position estimation method of the rotor according to the invention, one assumed that the d axis of the rotor position in the space voltage vector that represents the smallest inductance interval since, once in the space voltage vector period represents the largest inductance and a step of estimating that the q axis of the rotor position. Therefore, -30 for the d-axis location in the voltage space vectors each electric range or +30 degrees can be estimated within an electrical angle range. For the reverse motor inductance characteristics, and it applies the magnitude relationship between the inductance when compared to the contrary. ; Also, BLDC motor start-up process according to the invention, the magnitude relation or changes as compared to the two spatial voltage inductance of the vector, respectively used in the synthesis, after the applying time the inductance of the larger space voltage vector showing the maximum value to estimate that the rotor 30 is also moved at the time of reduction, and a voltage is applied to the q axis of the estimated rotor. Thus, FIG. 30 can generate the maximum torque by tracking the position of the rotor as a unit.
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