| 摘要 |
PURPOSE:To reduce the variation in the speed by gradually increasing an air gap between a movable element and a stator at the positions in the same direction as the moving direction of the element, thereby decreasing the reverse attracting force. CONSTITUTION:A movable element 1 of a brushless linear motor is composed of magnetic materials having a pitch P1, and a coil 4 is wound on one tooth 3 of a stator 2. A magnet is formed on the side of the core of the stator 2, a magnetic flux from the magnet is emitted through a stator core 3, teeth 3 and a main gap to the element 1, and returned to the magnet. Thus, the element 1 is attracted and repelled by poles P1-P9 formed in the stator 2, the permanent magnet and a coil 4 to move in the direction of an arrow as shown. In this case, the poles P4-P6, P7-P9 increases the air gap distance l2 to the teeth of the element 1 in the direction that the element 1 moves. Thus, reverse torque can be reduced. |
