Patent ID: 8842436

Claim:
An inverter module in which a power system board that converts DC power supplied from a power source to AC power and applies the AC power to an electric motor and a control board that controls the AC power applied to the electric motor are integrated via a resin case, wherein the inverter module is configured such that the power system board, on which a semiconductor switching device is mounted, is provided at the lower part of the resin case and the control board, on which a control-and-communication circuit operating at a low voltage, including a CPU, is provided above the power system board, and the resin case is filled with a thermosetting resin to a height position where the top surface of the power system board is covered, so that the power system board is encapsulated in the resin, and is filled with a gel-like material from the upper surface of the filled thermosetting resin to a height position where a lower half of large components, including a transformer and an electrolytic capacitor, which are mounted on the top surface of the control board, is covered, and where the upper half of the large components is not covered.