phase 4 pole brushless d c motor which is illustrated by way of example only in the accompanying drawings referring now to fig1 2b there is illustrated partially in block form in fig1 a system of a 3 phase 4 pole brush less d c motor according to the present invention the 3 phase 4 pole brushless d c motor includes a rotary machine 1 having a stator 4 constituted by three phases a b and c each phase having four windings 40 which are connected in parallel each phase is connected in parallel to a voltage controller directly in the case of a direct current power supply and through a direct current rectifier in the case of an alternating current supply so that the motor is composed efficiently the rotary machine 1 also has a rotor 7 constituted by one or more embedded permanent magnets 8 making the rotor having better flux concentration a rotor shaft 11 of the rotary machine 1 is projected outwardly from a bracket 12 which is fixed on one end of the rotary machine 1 a commutation encoder 2 is fixed along the length of the rotor shaft 11 towards one end thereof by means of a screw 16 and washer or like means so that the.