Patent ID: 8622721

Claim:
A motor-driven compressor comprising: a housing including a suction port and a discharge port; a rotary shaft; a compression mechanism disposed in the housing, the compression mechanism compressing refrigerant flowed through the suction port into the compression mechanism and discharging the refrigerant through the discharge port; and an electric motor disposed in the housing, the electric motor driving the rotary shaft to rotate to drive the compression mechanism, the electric motor including: a rotor fixedly mounted on the rotary shaft, the rotor includes a permanent magnet and a compressor interior environment improvement agent containing at least one of an absorbent for absorbing moisture and a neutralizer for neutralizing acid; and a stator fixed to the housing, wherein the rotor includes a magnet hole formed to extend through the rotor along the axial direction of the rotor, the permanent magnet is disposed in the magnet hole, the rotor includes an agent hole formed to extend through the rotor along the axial direction of the rotor, the compressor interior environment improvement agent is disposed in the agent hole, the rotor includes a rotor core including the magnet hole and the agent hole and a pair of end plates disposed on the opposite ends of the rotor core, each end plate closes the agent hole and the magnet hole so as to seal the agent hole and the magnet hole, and a communication passage is formed in the rotor core or the inner surface of the end plate for communication between the magnet hole and agent hole.