| 摘要 |
PROBLEM TO BE SOLVED: To implement a rotational speed change in a simple configuration while suppressing a reduction in motor output efficiency.SOLUTION: In a wiper motor 10, first brushes 100, 102 are electrically connected by a first wire 128, and second brushes 104, 106 are electrically connected by a second wire 130. The rotational speed of a motor body 12 is PWM-controlled by a circuit board 44. When the wiper motor 10 is controlled by PWM control, the pair of first brushes 100, 102 and the pair of second brushes 104, 106 are continuously used, so that there are no brushes left unused when the wiper motor 10 is driven. This can suppress a reduction in motor output efficiency caused by an induced voltage (counter voltage). This can also dispense with voltage equalizing wires to suppress complication of armature coil winding and connecting processes and provide a simply structured armature. |
