| 摘要 |
PROBLEM TO BE SOLVED: To provide a grounding circuit for an electric car with almost no trouble of induction at any time, regardless of connection structure between a car body and a chassis such as pressure/absence of measures against electric erosion. SOLUTION: A grounding brush 7 and a car body 9 are connected with a resistor 14. A harmonic current generated by switching an inverter 4 is carried from the inverter circuit 4 to a path made up of a motor wire 11, a floating capacity 12 of the motor, a motor frame 16, an equalizer 17, a grounding brush 7, a resistor 14, the body 9, a body ground 3, an inverter box 22, a box ground 10, and a grounding switch 6. Thus, the harmonic current is not passed to a main circuit wire 13. A variation in potential of the body 9 caused by a voltage drop in wiring inductance 18 related with the harmonic current can be reduced, so that trouble of induction on a train wireless apparatus or a signal apparatus can be prevented. |
