has either leading edges of rotor or magnet groups located asymmetrically in relation to axis of rotor A motor has a rotor which has a pair of magnet groups (43,44) to generate a magnet pole pair around the axis of the rotor. Each magnet group has a number of permanent magnets arranged in the peripheral direction. There is a coil unit (50,55). A stator (45,46) is coupled to the coil unit to generate a magnet pole pair. They lie opposite the magnet poles of the rotor when the coil unit is excited. The magnet poles of the stator have leading edges which the magnet groups approach first during the rotation of the rotor. Either the leading edges of the rotor or the magnet groups are located asymmetrically in relation to the axis of the rotor.
