| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitor for a DC motor, capable of warning an operator of an adverse effect, such as stopping of the motor generated when there is short circuit, before the rotation stopping by detecting short circuit between the commutators of the DC motor, and a failure detector thereof and a short circuit detector. SOLUTION: Brushes 7c and 7d brought into sliding contact with the commutator 2 of an armature 1 of a DC motor 10 detect a current value when they come into sliding contact with adjacent commutator segments 8a, 8b, 8c at the same time. If a cycle T3 at a normal current value reaches three times as large as the value, it is determined as the commutator 2 having short circuit to permit a warning means to display warning output.
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