Electro-hydraulic power steering device in vehicle, has controller comprising electro-conductive board provided external to metal substrate, electrically connected to capacitor

摘要

A controller for controlling drive of a hydraulic pump drive motor, has a heavy-current substrate on which a capacitor (51) for absorbing electric current ripple, is mounted. The capacitor is electrically connected to an electroconductive board (55) provided external to a metal substrate (40) that mounts a semiconductor switching element (41). An independent claim is also included for electro-hydraulic power steering device manufacturing method.