| 摘要 |
PURPOSE:To restrain increase in temperature of driving motors by controlling a driving motor which is specifically determined in the forwarding direction of a vehicle since related wheel is subject to the highest axial load, and having an invertor control the related motored fan to increase the quantity of cooling air. CONSTITUTION:When a forwarding signal, for example, is generated from a main controller 13, an inverter control circuit 14 gives a high frequency signal to the variable voltage and variable frequency inverters 9 to 12 of motored fans 1 to 4 corresponding to the motors 20 to 23 which drives wheels a carriage behind a vehicle in the forward direction thereof or wheels provided for the carriage. The motored fans 1 to 4 to which high frequency voltage is carried increase in quantity of air supplied for the motors 20 to 23 which drive the wheels of the carriage behind the vehicle in the forward direction. Even if the output of the driving motor of the wheel subjected to heavy axial load, the increase in temperature may be restrained effectively. |
