| 摘要 |
PROBLEM TO BE SOLVED: To load the motor of inverter drive and to suppress the heat generation of an inverter circuit by arranging a heat radiation plate integrated with a control circuit part inside the passage of intake air generated by a motor- driven blower. SOLUTION: An opening part 44c is provided on the upper wall surface of an orifice 44 and the heat radiation plate 42 for a control part is fixed with a machine screw 45 so as to project a heat radiation fin 42c through the opening part 44c into the orifice 44. Also, the opening part 44b is provided on the side wall outer surface of the orifice 44 and the heat radiation plate 40 for an inverter power source is fixed with the machine screw 45 so as to project the heat radiation fin 40c through the opening part 44b into the orifice 44. Thus, the heat generation by the heat generation components such as the rectifier circuit and FET of an inverter power source circuit and an inverter control circuit is radiated by exposing the heat radiation fins 40c and 42c of the heat radiation plate 40 for the inverter power source and the heat radiation plate 42 for the control part to an intake air flow by the motor-driven blower 7 and forced blowing and cooling are effectively performed.
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