| 摘要 |
PURPOSE:To easily and effectively eliminate the slip of wheels in an electric railcar by so reducing the target value of an armature current as to decrease a motor output while an unbalance exists in a magnetic field current between DC series motor groups. CONSTITUTION:If a specific wheel driven by first DC series motor group slightly slips, the armature current of the motor group in which the slip occurs decreases, and a deviation occurs between the armature current and a target current value. In order to eliminate the deviation, a current flowing to the first field winding group 12 is reduced. Thus, a difference occurs between the current of the first group and the field current of a second DC series motor group. A comparator 33 detects the difference of the field currents of the motor groups detected by field current detectors 31, 32, and applies a field current unbalance signal to a current setter 34. The setter 34 decreases the target current value by the unbalance detection signal.
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