Patent ID: 8339801

Claim:
An electric power steering apparatus, comprising: an electric motor for outputting an assist torque to a handle of a vehicle; and a controller for controlling drive of the electric motor, wherein the controller comprises: a power board, on which a bridge circuit including a plurality of semiconductor switching elements for switching a current of the electric motor according to the assist torque is mounted; capacitors for absorbing a ripple of the current switched by the plurality of semiconductor switching elements; a control board, on which a microcomputer for generating a drive signal for controlling the bridge circuit based on a steering torque of the handle is mounted; and a connection member formed by insert molding high-current conductive plates, through which a high current flows, and signal conductive plates, to/from which a low-current signal is input/output, with a frame-like insulating resin provided in proximity to an outer periphery of the power board, wherein the capacitors are arranged in a row along an end surface of one side of the power board and are electrically connected to the high-current conductive plates, and wherein the signal conductive plates are located on a side which is opposed to a side along which the capacitors are arranged and each of the signal conductive plates has one end electrically connected to a wiring pattern formed on the power board and another end electrically connected to the control board, wherein each of the signal conductive plates has a first path passing from the frame-like insulating resin to the power board and a second path passing from the frame-like insulating resin to the control board, and wherein a gap for absorbing deflection is formed in an area in which the first path and the second path are opposed to each other.