Motor mechanism of DC inverter-fed compressor

A motor mechanism of DC inverter-fed compressor, comprising:

• a first rotor layer made up of a plurality of first rotor units stacked together, the first rotor unit having at least one magnet slot capable of holding a permanent magnet at every quarter surface area thereon and having a plurality of first holes at one of the quarter areas;
• a second rotor layer made up of a plurality of second rotor units stacked together, the second rotor unit having the magnet slot at every quarter surface area thereon;
• a third rotor layer made up of a plurality of third rotor units stacked together, the third rotor unit having the magnet slot at every quarter surface thereon and having a plurality of third holes at one of the quarter areas, the third holes being configured at an area opposing the first holes, wherein the second rotor layer is disposed between the first and the third rotor layers;
• and
• a shaft hole disposed at the center of the first, second and third rotor units,
• wherein the respective heights of the first rotor layer, second rotor layer and third rotor layer are adjusted by adjusting the respective amounts of the first rotor units, second rotor units and third rotor units to achieve dynamic balancing.