Electric drive device and electric power steering device

Abstract

A position detecting purpose permanent magnetconstituting a position detection sensor is installed at an opposite side to an output side of a rotational shaftof a rotor housed within a motor housingA. A GMR elementwhich constitutes the position detection sensor and a position detection circuit thereof are installed on a side of a motor coveron which a position detection purpose permanent magnetis arranged. GMR elementis arranged on a position opposed against the position detection purpose permanent magnet. Thus, since the GMR element and the position detection purpose permanent magnet is installed, a mutually positioning assembly (attachment) accuracy can be improved. In addition, since the electric power conversion circuit and both of the GMR element and its position detection circuit are kept away, such an effect that an accurate detection signal can be obtained can be achieved.