| 摘要 |
PROBLEM TO BE SOLVED: To provide a linear actuator capable of suppressing changes of a clearance.SOLUTION: In the inside of a bottomed-cylindrical outer yoke 2, a magnet 3 vertically oriented and an inner yoke 4 are provided in an order from a lower side. A magnetic gap is formed in a lateral direction between the inner yoke 4 and the outer yoke 2. When a coil 6 in the magnetic gap is energized, linear movement is generated by electromagnetic force generated in a direction of a thumb according to the Fleming's left-hand rule. A bobbin 7 wound with the coil 6 is provided with a positioning magnet 9 which has a magnetic pole repelling to a magnetic pole due to a leakage magnetic flux from the inner yoke 4 toward the outer yoke 2 above the magnetic gap, and positions the coil 6 at a balancing position of repulsion force.SELECTED DRAWING: Figure 1 |
