| 摘要 |
There is provided a motor controller which eliminates a positioning operation between a power semiconductor element and a base plate to improve assemblability. A motor controller has a power semiconductor element ( 3 ) closely contacted with a heatsink ( 1 ) and mounted in a first base plate ( 4 ), wherein a spacer ( 2 ) having an engaging section ( 2 e) formed therein as a hole for the power semiconductor element ( 3 ) is interposed between the heatsink ( 1 ) and the base plate ( 4 ), and the power semiconductor element ( 3 ) is positioned in the spacer ( 2 ). Further, the peripheral wall of the hole is arranged so as to shut off a space between a terminal projecting from the side of the power semiconductor element ( 3 ) and the heatsink ( 1 ).
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