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A primary for a linear drive motor has a stage with stacks made from solid steel. Each stack has inner and outer teeth made that form a generally u-shaped cross-section for the stack. A magnet is disposed between the first and second stacks and a a coil wrapped between the first and second stacks. T

A primary for a linear drive motor has a stage with stacks made from solid steel. Each stack has inner and outer teeth made that form a generally u-shaped cross-section for the stack. A magnet is disposed between the first and second stacks and a a coil wrapped between the first and second stacks. The stacks may be placed in a housing or may be formed as a housingless stage. The stacks and/or housing may be modified to selectively skew motor alignment to reduce motor cogging. The stacks may be contoured to follow various secondary forms. The stack inner and outer teeth lengths may be adjusted to help balance or optimize the magnetic circuit, to increase tooth surface area for increasing force, to allow more motor windings in the coil of the stack assembly, and to help locate the magnet and coil near the tooth surface.

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1. 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

1. 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; anda 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. 2. The primary of claim 1 further comprising fluid passages formed in the first and second stacks. 3. The primary of claim 2 wherein the fluid passages cool the first and stacks. 4. The primary of claim 3 wherein the gas passages have discharges on the bottom faces of the first and second stacks. 5. The primary of claim 1 further comprising application mounting holes in a top surface of at least one of the first and second stacks. 6. The primary of claim 1, wherein the outer tooth of the first and second stacks each has a projection extending in a direction that is transverse to the width dimensions of the outer tooth. 7. The primary of claim 6, wherein the outer tooth projection is configured for mounting of a bearing for the primary. 8. The primary of claim 1, wherein the inner tooth has a length along a direction transverse to the inner tooth width, and the outer tooth has a length extending from a direction transverse to the outer tooth width, and the inner tooth length is less than the outer tooth and length. 9. The primary of claim 8, wherein the coil envelops the magnet. 10. The primary of claim 1, wherein bottom surfaces of the teeth are arcuate and conform to a curved secondary of the linear drive motor. 11. The primary of claim 1, wherein the stacks comprise an annealed low carbon steel. 12. The primary of claim 1, wherein the teeth of the stack have a spacing that is offset relative to a secondary associated with the primary stage. 13. A primary for a linear drive motor comprising: a stage comprising: a stack assembly 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; anda 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. 14. The primary of claim 13, further comprising a housing having an encoder locator with an encoder read head for the linear drive motor mounted therein and stack assembly locator with the stack assembly mounted therein, the encoder locator and the stack assembly locator all being synchronized with a secondary of the linear drive motor. 15. The primary of claim 14, further comprising fluid passages formed in the housing communicating with the stacks. 16. The primary of claim 14, wherein the inner tooth has a length along a direction transverse to the inner tooth width, and the outer tooth has a length extending from a direction transverse to the outer tooth width, and the inner tooth length is less than the outer tooth and length. 17. The primary of claim 14, wherein the outer tooth of the first and second stacks each has a projection extending in a direction that is traverse to the width dimensions of the outer tooth. 18. The primary of claim 14, wherein the stacks comprise an annealed low carbon steel. 19. The primary of claim 14, wherein the stacks are formed from a magnetic stainless steel. 20. The primary of claim 14, wherein bottom surfaces of the teeth are arcuate and conform to a curved secondary of the linear drive motor. 21. The primary of claim 14, further comprising epoxy coating the stack assembly. 22. The primary of claim 14, wherein the housing has at least one additional stack assembly locator with at least one additional like stack assembly mounted therein, the at least one additional stack assembly locator being shifted relative to the stack assembly mounted therein for creating skew in the alignment of the teeth of the primary relative to teeth of a secondary. 23. The primary of claim 14, wherein the inner teeth of the first and second stacks each have a ledge extending from their respective exterior surfaces with the magnet abutting the ledge. 24. The primary of claim 23, wherein the ledge has a dimension corresponding to an amount of skew in the alignment of the teeth of the primary relative to teeth of a secondary. 25. The primary of claim 14, wherein the housing has a first passageway configured to deliver cooling fluid adjacent the stack assembly locator. 26. The primary of claim 25, wherein the first passageway communicates with at least one of the stacks in the stack assembly. 27. The primary of claim 26, further comprising ports in the stack assembly that form a fluid tight connection with the first passageway in the housing when the stack assembly is mounted in the stack assembly locator of the housing. 28. The primary of claim 27, wherein the housing has a second passageway configured to receive fluid from the stack assembly.