Brushless motor

A brushless motor comprising a stator core having a plurality of tooth portions disposed at spaces in a peripheral direction, coil means wound in a required manner in the plurality of tooth portions, an annular rotor magnet disposed in opposition to the stator core and having N poles and S poles alternatively, and a position detecting sensor for detecting the rotating angular position of the rotor magnet, wherein

• the plurality of tooth portions are provided in the same number as the number of magnetic poles of the rotor magnet,
• the position detecting sensor is disposed among adjoining tooth portions of the plurality of tooth portions,
• the coil means are composed of a single-phase coil, and the coils are wound on the plurality of tooth portions so that the winding directions are alternatively opposite to each other,
• and the control means, based on the detection signal of the position detecting sensor, does not substantially contain a posing period, and switches off a current supplied to the coils.