On-vehicle motor-driven compressor

An on-vehicle motor-driven compressor comprising:

• a compression unit configured to compress fluid;
• an electric motor configured to drive the compression unit;
• and
• an inverter device configured to drive the electric motor, wherein
• the inverter device includes:
• an inverter circuit configured to convert direct-current power into alternating-current power, and
• a noise reducer arranged on an input side of the inverter circuit, wherein the noise reducer is configured to reduce common-mode noise and normal-mode noise contained in the direct-current power before being input to the inverter circuit,
• the noise reducer includes:
• a common-mode choke coil, and
• a smoothing capacitor, wherein the common-mode choke coil and the smoothing capacitor configure a low-pass filter circuit,
• the common-mode choke coil includes:
• a loop-shaped core,
• a first winding wound around the core,
• a second winding wound around the core, wherein the second winding is spaced apart from and opposed to the first winding, and
• a loop-shaped conductor that covers the core while extending over the first winding and the second winding,
• the core includes an exposed portion that is not covered with the conductor, and
• a hole is defined inside of the core and the hole has two openings at both ends thereof, and the conductor covers the two openings of the hole.