| 摘要 |
A brushless DC motor, most especially a linear motor, has a wound and an unwound part, one part forming the stator and the other the armature, and includes a permanent field magnet arrangement to generate flux and windings linked by the flux. One motor part is provided with a series of flux-conducting portions and the other part is provided with a plurality of flux-carrying portions forming an air gap with the flux-conducting portions. By making the distance from one flux-conducting portion to the next small, and the distance from one flux-carrying portion to the next small, it becomes possible to minimize the distance through which the armature need move to go from a position linking maximum first-polarity flux with a respective winding to a position linking maximum second-polarity flux with that winding. By then providing the flux-carrying portions in an appropriately increased number, to thereby increase the values of the maximum first- and second-polarity linked flux, the force-to-velocity ratio of the motor can be almost arbitrarily increased, this being the equivalent of providing in a rotary motor speed-reducing gearing of high mechanical advantage.
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