4 Pack Electromagnet Coil for DIY Maglev Projects, 21mm OD, High Thrust Copper Core

100 percent brand new and high quality magnetic levitation coils designed to generate a controllable magnetic field for stable magnetic suspension of small permanent magnets. Key benefits: - Enables adjustable magnetic force for precise levitation control, making setup and tuning straightforward. - Compact copper-colored metal construction provides reliable mechanical stability for experiment and prototype use. - Four identical coils in one set allow multi-point setups or spare parts without additional purchases. - Simple electrical control allows pushing or pulling of a top permanent magnet by changing current magnitude and direction. Key features and specifications: - Material: metal, with a copper-colored finish for visual compatibility with electronics and hobby projects. - Outer diameter: approximately 21 mm. - Inner diameter: 9 mm. - Height: approximately 22 mm. - Wire diameter: 0.45 mm. - Electrical inductance: 6.7 MHz. - Quantity: 4 pieces in the set. How it works: - When an electric current flows through each coil, a magnetic field is produced around the coil that can generate a repulsive or attractive force on a nearby permanent magnet. - By adjusting the current magnitude and direction, the magnetic force can be tuned to achieve stable magnetic suspension or controlled motion in electromagnetic demonstrations. Typical use scenarios: - Experimental levitation demonstrations for physics classes and hobby projects where controlled magnetic suspension is required. - Prototype development for contactless bearings, sensors, or magnetic coupling experiments that need small, repeatable coils. - DIY magnetic displays or novelty devices that rely on adjustable magnetic interaction with a permanent magnet. Package contents: - Four magnetic levitation coils supplied as described above. This product is supplied as four identical metal coils ready for integration into experimental setups, prototypes, or educational demonstrations.