Piston unit for compressor

A piston unit for a compressor, comprising:

• a first head provided in a first chamber of a cylinder for a first linear reciprocal movement in the first chamber;
• a second head provided in a second chamber of the cylinder for a second linear reciprocal movement in the second chamber, wherein the second head is vertically spaced apart from the first head;
• a bridge connecting the first head and the second head;
• and
• a coil member provided around the bridge and fixed to the cylinder,
• wherein an outer diameter of the coil member is greater than a diameter of the first and second chambers,
• wherein the bridge comprises:
• a first non-magnetic portion coupled to the first head;
• a second non-magnetic portion coupled to the second head;
• and
• a magnetic portion provided between the first and second non-magnetic portions,
• wherein a diameter of the first and second non-magnetic portions is equal to a diameter of the magnetic portion,
• wherein an inner diameter of the coil member is less than a diameter of the first and second heads,
• wherein the magnetic portion of the bridge includes first, second, third, fourth, and fifth magnetic members,
• wherein the diameter of the first and second heads is greater than a diameter of the first, second, third, fourth, and fifth magnetic members,
• wherein all of the first, second, third, fourth, and fifth magnetic members are adjacent to each other.