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My project is to pull an object along a path with solenoids, by cycling their on/off state. I don't know if ferrous core solenoids pulling steel would be more efficient than pulling a neodymium magnet with air-core solenoids. Simple diagram is shown below.

Would ferrous core solenoids with a steel slug be more efficient than air-core solenoids with a neodymium slug?

My goal is to have smaller solenoids ~1cm in diameter. I'm not sure how the size of the solenoid might affect this answer. If voltge/current/power affects the answer, please let me know. Thank you in advance.

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Scott
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  • If you have wheels, it’s easier but the Japanese maglev train floats on the repulsive force between the copper or aluminum coils in the track and a series of helium-cooled, niobium-titanium superconducting magnets. You must define your expected power levels required and then torque . – Tony Stewart EE75 Jul 24 '21 at 13:47

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