MOTOR DRIVE DEVICE

To prevent components provided on a power board from malfunctioning due to heat generated by the power board.SOLUTION: A motor drive device 10 comprises: a control board 12 on which is mounted a control circuit 20 that outputs a control signal of a secondary voltage; and a power board 14 on which is mounted a power circuit 22 to which a primary voltage higher than the secondary voltage is applied. The power board 14 includes: a first board 14a on which is mounted a primary voltage component 22a to which only a primary voltage is applied; and a second board 14b on which is mounted a conversion component 22b for converting the primary voltage to the secondary voltage and the secondary voltage to the primary voltage.SELECTED DRAWING: Figure 1 【課題】パワー基板の発熱によってパワー基板に設けられる部品が誤作動を起こしてしまうことを防止する。【解決手段】モータ駆動装置１０は、２次電圧の制御信号を出力する制御回路２０が実装された制御基板１２と、２次電圧より大きい１次電圧が印加されるパワー回路２２が実装されたパワー基板１４と、を備える。パワー基板１４は、１次電圧のみが印加される１次電圧部品２２ａが実装された第１基板１４ａと、１次電圧を２次電圧に、２次電圧を１次電圧に変換する変換部品２２ｂが実装された第２基板１４ｂと、を有する。【選択図】図１