neodymium(NdFeB) magnets, samarium cobalt(SmCo5, Sm2Co17)magnets, Alnico magnets, permanent rare earth magnets.

how to magnetized alnico,SmCo(samarium cobalt),NdFeB(neodymium iron boron) magnet?

A practical experiment involves dropping a magnet down a copper pipe. The inner diameter of the copper pipe should be only slightly greater than the diameter of the magnet to give the best effects. We suggest using our EP656 D12mm x 3mmA magnets with 15mm diameter copper pipe and our EP372 D18mm x 3mmA magnets with 22mm diameter copper pipe. Dropping the magnet outside of the pipe will show the speed at which the magnet falls due to gravity alone – this can be timed, typically less than a second for 0.5m fall. If the magnet is then dropped down the copper pipe, the magnet does not fall as quickly – it takes much longer, around 5 to 6 seconds. Faraday's law is a fundamental relationship which comes from Maxwell's equations. It serves as a succinct summary of the ways a voltage may be generated by a changing magnetic environment. The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil. It involves the interaction of charge with magnetic field.

A permanent magnet radial magnetizer is provided for use in radially magnetizing a workpiece ring. This magnetizer includes a lower magic hemisphere and an upper magic hemisphere which have respective equatorial surfaces in oppositely facing relationship to form a gap that receives a workpiece ring to be radially magnetized, and which have respective permanent magnet toroidal flux-line pathways, and which enclose a spherical cavity containing an iron filler.

1. A permanent magnet radial magnetizer, comprising: a lower magic hemisphere having an axis; an upper magic hemisphere coaxially aligned with and mounted in opposition to said lower magic hemisphere; said lower magic hemisphere and said upper magic hemisphere each having an equatorial surface forming a gap therebetween for receiving a workpiece to be radially magnetized; said lower magic hemisphere and said upper magic hemisphere each having an inner surface which forms a spherical cavity; said lower magic hemisphere and said upper magic hemisphere each having a flux line pathway within said cavity, said flux line pathway having an axial flux component and a radial flux component; and selective fill medium disposed in said cavity.

2.The magnetizer of claim 1, further comprising: a ring-shaped workpiece to be magnetized.

3. The magnetizer of claim 1, wherein said lower magic hemisphere and said upper magic hemisphere are each a northern type of permanent magnet hemisphere, and said radial flux components are directed radially outwardly.

4. The magnetizer of claim 1, wherein said selective fill medium is iron fill Magnetic Material.

  • 5. The magnetizer of claim 1, wherein said lower magic hemisphere and said upper magic hemisphere are each a southern type of permanent magnet hemisphere, and said radial flux components are directed radially inwardly.

    6. The magnetizer of claim 1, further comprising: a jig device having an upper jig portion connected to said upper magic hemisphere, a lower jig portion connected to said lower magic hemisphere, said upper and lower jig portions being adjustably coupled to each other for supporting said upper and lower magic hemispheres, and for varying the thickness of said gap.

    7. The magnetizer of claim 1, wherein said lower magic hemisphere and said upper magic hemisphere have respective outer surfaces with a common outer radius dimension; said inner surfaces of said lower magic hemisphere and said upper magic hemisphere have a common inner radius dimension; and the ratio of the common outer radius dimension to the common inner radius dimension has a selective value of about three.

    8. A permanent magnet radial magnetizer, comprising: a lower magic hemisphere having an axis; an upper magic hemisphere coaxially aligned with and mounted in opposition to said lower magic hemisphere; said lower and upper magic hemispheres each having an equatorial surface with a recess formed therein for receiving a workpiece to be radially magnetized; said lower and upper magic hemispheres each having an inner surface which forms a spherical cavity; said lower and upper magic hemispheres each having a flux line pathway within said cavity, said flux line pathway having an axial flux component and a radial flux component; and selective fill medium disposed within said cavity.

    9.Block magnets are defined by three dimensions: Length, Width and Thickness. To be consistent, we define the Thickness dimension along the axis of magnetization. The thickness is usually the smallest dimension, but not always!

    We're sometimes asked if we can provide block magnets magnetized through the length or width. Yes, we do have some long "bar" magnets, where the magnetization is in the longest dimension. We do still define this as the Thickness, though. Ring magnets can be axially or diametrically magnetized. Arc Segment magnets can be magnetized in one of four directions.

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