Patent ID: 6886366

Claim:
Electronic device for regulating and controlling the delivery of yarn ( 18 ) coming from yarn storage units of textile machines, said electronic device comprising at least one local power supply ( 38 ) for supplying electric power and means for varying the r.p.m. of a motor ( 23 ) so as to keep it synchronised, according to an adjustable scale factor, with the speed of the textile machine to which said device is connected, wherein said motor ( 23 ) is, a D.C. brushless motor and said means for varying the r.p.m. of the motor ( 23 ) comprise an electronic circuit, which includes at least one microcontroller ( 21 ) that controls the r.p.m. of the motor ( 23 ) and the currents (I 1 , I 2 , I 3 ) circulating in the phases of said motor ( 23 ), characterised in that said D.C. brushless motor has three windings, which can be powered at any time to let the rotor of said motor ( 23 ) travel depending on a prefixed position of the rotor, so that, with three combinations of use in one direction of said motor windings, said combinations providing for just two windings to be powered at a time, three further intermediate switching combinations can be utilised, wherein, alternately, one winding is connected to the positive pole of said power supply ( 38 ) and the other two windings are simultaneously connected to the negative pole of said power supply ( 38 ), or vice versa, to obtain six switchings for each motor pole corresponding to six equidistant angular shifts of said rotor.