| 摘要 |
PURPOSE:To prevent the heating of a drive motor due to forgotton operation of an operation switch of a power increasing mechanism by interrupting an operation signal of the mechanism when the temperature of the motor exceeds the preset value. CONSTITUTION:A bypass contactor closure discriminator 9 outputs, when the current flow rate outputted from a current flow rate detector 7 becomes approx. 80%, a closure signal at the normally operating time. A bypass contactor unit 13 closes, when a closure signal is applied, a bypass contactor 11 to apply the voltage of a battery 1 directly to a drive motor 3. In case that a power increasing switch 21' is ON, a bypass contactor closure signal is, when the current flow rate becomes approx. 30%, outputted. When the temperature of the motor 3 exceeds the prescribed temperature level, a thermoswitch 23 becomes OFF to interrupt the function of the power increasing switch 21'. |
