12.5x5x1mm Nd Thin Ring Magnet

SKU: 44607-1

$0.30USD or lower Each

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The homopolar motor was the first electric motor. The Indigo D12.5xd5x1mm permanent ring magnet can produce a magnetic field needed for this simple DC electric motor. It needs no commutator since the resulting force produced in the wire depends on its 2 magnetic poles. AC motors are far more common but railguns, using high current low voltage homopolar generators, can propel objects faster than conventional cannons.

If you buy our Electric Circuits kit, there should be enough spare wire left over to build this motor. In addition, the simple Mark II Magnaprobe can be used to investigate the magnetic field produced in this experiment.

We have sold NdFeB magnets since 1996 and N42 grade since 2003, the best value for strength & temperature vs cost. Don't be fooled by claims of higher strength, N52, at lower cost.

Read the complete Google Customer Review for: "...(Indigo) N42 Neodymium magnets...the real deal…bought magnets on Amazon advertised as N52… another cheap Chinese fake"

We also provide complete Documentation including MSDS & ROHS; see below.
Details Specs Docs Reviews Related Products
Details

Other homopolar motor designs can use various ring magnets as well as disc magnets. All other Indigo neodymium magnets are certified N42 grade. Don't be fooled by unsubstantiated specifications of so-called "N52" grade.

Here are a few Google Reviews:

...(Indigo) N42 Neodymium magnets, they are the real deal…bought magnets on Amazon...advertised as N52… another cheap Chinese fake. …(Indigo) sells authentic, high quality stuff … Highly recommended...full review at: Tracy Myerson.

Been doing business with Indigo for many years...Neodymium magnets are superb in quality and price...tools, magnifiers, tweezers...all ...withstanding the test of time...full review at: Peter Maran.

Fantastic support and product. Beats Amazon price with real customer service...product was of the highest quality and exactly as described. Will buy other items from Indigo instruments.... full review at: Ron Bennett

 

Specifications
SKU:44607-1;     Size:OD12.5 x 5 x 1
Pull Force in Pounds & Kilograms at different distances (mm) above Magnet
Distance (mm): 0 0.1 1 10
Pounds 1.47 1.19 0.5 0.01
Kilogram 0.67 0.54 0.23 0.00

 

Click on N42 Magnet Specifications for a table that lists general characteristics such as coercivity & remanence.

Click on N42 Magnet Tolerances for a table that lists the range of variation in thickness, diameter, etc.

Click on American vs Metric to see a table with conversions & as well as rounded mm equivalents closest to inch sizes.

Documentation

Magnet Documentation
Drawing Compliance MSDS ROHS Graph REACH
Magnet Technical Diagram Certificate of Compliance MSDS ROHS N42 Graph REACH Document
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