Storage battery-powered multiphase permanent magnet brushless DC motor

The invention relates to a storage battery-powered multiphase permanent magnet brushless DC motor for electric vehicles, which is characterized in that: the phase current I phi of a three-phase brushless DC motor is in proportion to the electromagnetic torque Te of the three-phase brushless DC motor, and the peak value and duty ratio D of the discharge current of a storage battery are equal to those of the phase current of the storage battery; when Te increases, the peak values of the phase current and the discharge current also increase proportionally, so that the storage battery discharges under high magnification, and the number of the actual discharging ampere-hour is much smaller than that of the equipment ampere-hour of the storage battery. In the invention, n independent three-phase armature windings are correspondingly connected with the output ends of n three-phase voltage-source inverting bridges; and the PWM modulation frequencies fPWMs of n three-phase voltage-source inverting bridges are the same, but the PWM initial phases of the half of the inverting bridges have a mutual 1/2TPWM phase shift relative to the PWM initial phase of the rest inverting bridges, and TPWM is equal to 1/fPWM. The storage battery-powered multiphase permanent magnet brushless DC motor of the invention can extend the driving range on a single charge of the storage battery-powered electric vehicle operated under the same operating condition by 20 to 25 percent, or make the equipment capacity of the storage battery reduced to 80 to 75 percent of the original capacity when the driving range on a single charge is not changed.