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Ironless motors are often preferred in sensitive applications
Permanent magnet, dc linear servomotors have two fundamental constructions, ironcore and ironless (also referred to as slotless). An important feature of the ironless motor's design is zero cogging which assures ultrasmooth operation.
Zero cogging is possible because there are no attractive forces between the frameless components. Coils are not wound around iron teeth or slots in an ironless design. This makes the ironless linear motor well suited for applications requiring very low bearing friction, high acceleration of lighter loads, and constant velocity at low speeds.
Ironcore motors have coils wound on silicon steel laminations. The coils are wound between the teeth and the slots on the lamination stack. The ironcore...