| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress variations in motor torque caused by variations in field current. <P>SOLUTION: One side terminals of field windings 7, 8 are connected to slip rings 11a, 11b, respectively. The other side terminals of the field windings 7, 8 are connected to a slip ring 11c. Brushes 12a, 12b, 12c slide along the slip rings 11a, 11b, 11c, respectively. The brush 12c is connected to a positive electrode of a DC power supply 22 whose negative electrode is grounded. The brush 12a is connected to a drain of a driving element 23 whose source is grounded. The brush 12b is connected to a drain of a driving element 24 whose source is grounded. Drive signal input terminals 25, 26 turn on/off the driving elements 23, 24 or perform PWM current control of them to drive the field windings 7, 8, individually. <P>COPYRIGHT: (C)2010,JPO&INPIT |
