Mold module utilized as power unit of electric power steering apparatus and electric power steering apparatus

An electric power steering apparatus comprising:

• a speed reducing mechanism coupled with a steering shaft of a vehicle,
• a motor whose rotor shaft is coupled with the speed reducing mechanism, and
• a motor controller that controls electric power supplied to an armature winding of the motor so as to make the motor produce predetermined torque,
• wherein the motor controller is provided with a mold module in which a plurality of lead frames for forming wiring leads and a plurality of electronic components mounted on the respective lead frames are molded with a molding resin and in which at least part of the plurality of lead frames are exposed at the rear side of the mold resin, and
• wherein the rear side of the mold module is adhered to the case of the motor through the intermediary of a heat transfer resin.

An electric power steering apparatus comprising:

• a speed reducing mechanism coupled with a steering shaft of a vehicle,
• a motor whose rotor shaft is coupled with the speed reducing mechanism, and
• a motor controller that controls electric power supplied to an armature winding of the motor so as to make the motor produce predetermined torque,
• wherein the motor controller is provided with a mold module in which a plurality of lead frames for forming wiring leads and a plurality of electronic components mounted on the respective lead frames are molded with a molding resin and in which at least part of the plurality of lead frames are exposed at the rear side of the mold resin, and the rear side of the mold module is adhered to the motor case through the intermediary of a ceramic insulation sheet.

An electric power steering apparatus comprising:

• a speed reducing mechanism coupled with a steering shaft of a vehicle,
• a motor whose rotor shaft is coupled with the speed reducing mechanism, and
• wherein the motor controller is provided with a mold module in which a plurality of lead frames for forming wiring leads and a plurality of electronic components mounted on the respective lead frames are molded with a molding resin and in which at least part of the plurality of lead frames are exposed at the rear side of the mold resin, a heat sink, and a controller case that incorporates the mold module and the heat sink, and
• wherein the rear side of the mold module is adhered to the heat sink through the intermediary of a heat transfer resin.

An electric power steering apparatus comprising:

• a speed reducing mechanism coupled with a steering shaft of a vehicle,
• a motor whose rotor shaft is coupled with the speed reducing mechanism, and
• wherein the motor controller is provided with a mold module in which a plurality of lead frames for forming wiring leads and a plurality of electronic components mounted on the respective lead frames are molded with a molding resin and in which at least part of the plurality of lead frames are exposed at the rear side of the mold resin, a heat sink, and a controller case that incorporates the mold module and the heat sink, and
• wherein the rear side of the mold module is adhered to the heat sink through the intermediary of a ceramic insulation sheet.