IRON CORE TYPE LINEAR MOTOR WITHOUT COGGING FORCE

摘要

The linear motor with iron core is a core value of the magnetic element, the interaction between the slot and a permanent magnet has generated a nose gingryeok (cogging force) due to the. This causes a vibration in the nose gingryeok mover when the motor is running and causing an imbalance of power. Especially if you are placing a large number of movers in direct or parallel to obtain a large thrust has also become a very big nose gingryeok is kkichige fatal adverse effect on performance. The precision and the driving value to avoid the degradation of the motor evoke the required nose gingryeok jugeona a change in the size and shape of the slot, such as method of varying the distance between the mover have been researched. However, the method proposed in conventional or a side effect of reducing the thrust are given to the change in shape of the teeth and slots of the core, there is a disadvantage of the structure should be arranged at regular intervals, a plurality of moving characters in order to eliminate the nose gingryeok. In the present invention, to essentially remove the nose gingryeok in hardware, when the pole pitch (pole pitch) of a permanent magnet that _p and hayeoteul the UVW 3-phase coil as a unit, and the other coil unit the unit of interval 1/3 _p (the electrical angle 60 ) by a total of three pairs of co gingryeok occurring in each coil unit in the gun by having a single coil unit 3 pairs of core When a hit is configured such that the sum is consequently cancel each other. A linear motor with a core (the core cheuksik stage) proposed by the present invention is also provided with a number of cores, however it becomes possible that complete removal of the nose to the direct and parallel gingryeok gingryeok nose has the advantage that does not exist. In addition, a shape similar to that of the core arranged to be symmetrical with both sides of the stage cheuksik core (the core on both sides formula) becomes to be greater than the thrust generated as the core of a small volume.