Patent ID: 8791608

Claim:
A primary for a linear drive motor: a stage comprising: a first stack having an inner tooth with an interior surface and exterior surface and an outer tooth with an interior surface and an exterior surface, the inner and outer teeth being monolithically formed in the first stack, the inner tooth interior surface being spaced from the outer tooth interior surface so that the inner and outer teeth form a generally u-shaped cross-section for the first stack, the first stack being monolithically formed from a steel, the inner tooth having a tooth width defined by the inner tooth interior surface and inner tooth exterior surface, the outer tooth having a tooth width defined by the outer tooth interior surface and outer tooth exterior surface; a second stack having an inner tooth with an interior surface and exterior surface and an outer tooth with an interior surface and an exterior surface, the inner and outer teeth being monolithically formed in the second stack, the inner tooth interior surface being spaced from the outer tooth interior surface so that the inner and outer teeth form a generally u-shaped cross-section for the second stack, the second stack being monolithically formed from a steel, the inner tooth having a tooth width defined by the inner tooth interior surface and inner tooth exterior surface, the outer tooth having a tooth width defined by the outer tooth interior surface and outer tooth exterior surface; a magnet disposed between the first and second stacks adjacent the exterior surfaces of the inner teeth of the first and second stacks; and a coil wrapped between the first and second stacks with an inner diameter portion of the coil circumscribing the interior surfaces of the inner teeth of the first and the second stacks and an outer diameter portion of the coil adjacent the interior surfaces of the outer teeth of the first and the second stacks.