<p>The brushless motor includes a rotor (4) with which a rotation shaft (3) is fixed. The rotation shaft is rotatably supported by a support tube (6) through a pair of bearings (9a,9b). The bearings are provided inside the support tube. The rotation shaft is installed in an axial installation part (17) of a sensor magnet (14). The sensor magnet is attached at the end of the rotor. The sensor magnet detects the change in magnetic pole associated with the rotation. An armature coil is set up in a stator (2). The energising power of the armature coil is controlled so that a rotating magnetic field is produced. Due to friction with the bearings, a wear powder is produced. The produced wear powder is sucked out through the axial installation part of the sensor magnet.</p>
