| 摘要 |
An electronic device for regulating and controlling the delivery of yarn ( 18 ) coming from feed units of textile machines, which is designed to vary the r.p.m. of a d.c. brushless motor ( 23 ) so as to keep it as synchronized as possible, according to an adjustable scale factor, with the speed of the textile machine served; the device comprises the d.c. brushless motor ( 23 ) and an electronic circuit based upon operation of a microcontroller ( 21 ) that is able to control the r.p.m. of the motor ( 23 ) and the currents (I 1 , I 2 , I 3 ) in the phases of the aforesaid motor ( 23 ).
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