Motor-driven compressor

A motor-driven compressor, comprising:

• a compression unit configured to compress a 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 DC power to AC power;
• and
• a noise reducing unit that is provided on an input side of the inverter circuit and is configured to reduce common-mode noise and normal-mode noise included in the DC power before the DC power is supplied to the inverter circuit,
• the noise reducing unit includes:
• common-mode choke coils;
• and
• a smoothing capacitor that is included in a low-pass filter circuit together with the common-mode choke coils,
• the common-mode choke coils include a first coil and a second coil, the first coil includes:
• an annular first core;
• a first winding wound around the first core;
• a second winding that is wound around the first core at a position away from the first winding so as to face the first winding;
• and
• an annular first conductor that extends over and surrounds the first winding and the second winding,
• the first conductor includes two regions respectively covering two openings of a first hole inside the first core, the two regions being opposed to each other with the first hole between them,
• the first core includes:
• a first straight portion that extends linearly, at least a part of the first winding being wound around the first straight portion;
• and
• a second straight portion that extends parallel with the first straight portion, at least a part of the second winding being wound around the second straight portion,
• the second coil includes:
• an annular second core;
• a third winding wound around the second core;
• a fourth winding that is wound around the second core at a position away from the third winding so as to face the third winding;
• and
• an annular second conductor that extends over and surrounds the third winding and the fourth winding,
• the second conductor includes two regions respectively covering two openings of a second hole inside the second core, the two regions being opposed to each other with the second hole between them,
• the second core includes:
• a third straight portion that extends linearly, at least a part of the third winding being wound around the third straight portion;
• and
• a fourth straight portion that extends parallel with the third straight portion, at least a part of the fourth winding being wound around the fourth straight portion,
• the first winding and the third winding are electrically connected to each other,
• the second winding and the fourth winding are electrically connected to each other, and
• the first coil and the second coil are arranged side by side such that a current flowing through the first winding and the third winding generates an annular magnetic flux that passes through both of the first straight portion and the third straight portion.