Linear actuator, and pump device and compressor device therewith

A pump device comprising:

• a linear actuator comprising:
• a driving part comprising:
• an inner yoke;
• an outer yoke which is disposed around the inner yoke such that a first gap space and a second gap space separated in an axial direction are formed between an outer peripheral face of the inner yoke and the outer yoke;
• a coil for generating an alternating magnetic field in the first gap space and the second gap space with the outer yoke, the first gap space, the inner yoke, the second gap space and the outer yoke as a magnetic path;
• and
• a coil bobbin around which the coil is wound and which is provided with terminals for power supply to the coil;
• and
• a movable body provided with a magnet which is disposed between the inner yoke and the outer yoke, and the movable body being reciprocated in the axial direction in cooperation with an alternating magnetic field.

A compressor device comprising:

• a linear actuator comprising:
• a driving part comprising:
• an inner yoke;
• an outer yoke which is disposed around the inner yoke such that a first gap space and a second gap space separated in an axial direction are formed between an outer peripheral face of the inner yoke and the outer yoke;
• a coil for generating an alternating magnetic field in the first gap space and the second gap space with the outer yoke, the first gap space, the inner yoke, the second gap space and the outer yoke as a magnetic path;
• and
• a coil bobbin around which the coil is wound and which is provided with terminals for power supply to the coil;
• and
• a movable body provided with a magnet which is disposed between the inner yoke and the outer yoke, and the movable body being reciprocated in the axial direction in cooperation with the alternating magnetic field.