Customized Permanent AlNiCo Rotor Magnets
Alnico rotor magnets are made with Alnico 5 material and have a maximum temperature of approximately 1000°F.
They are supplied un-magnetized unless otherwise requested. Magnetization after assembly is required to gain the full benefits of these magnets. Alnico magnets, cast and sintered, are finished ground using abrasive grinding to produce the final shape and tolerance. Once ground the material is a shiny metallic finish. These materials are brittle and cannot be machined or drilled.
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Material: AlNiCo
Size: Various kinds or as per customers' request
Shape: Disc/ Customized (block,disc,Cylinder, Bar, Ring, Countersunk, Segment,hook,cup, Trapezoid, Irregular shapes ,etc)
Performance: AlNiCo 2/5/6/7/8
Coating: Plain
Size tolerance: ±0.002mm for diamater/thickness, ±0.002mm for width/length
Magnetization: Thickness Magnetized, Axially Magnetized, Diametrally Magnetized
Max. Working Temperature: 550°C
Common Characteristics of Alnico magnets
1. Very temperature stable, great for high heat applications
2. Wide range of working temperatures, up to 550ºC
3. May be ground to size
4. Does not lend itself to conventional machining (hard and brittle)
5. High residual induction and energy product compared to ceramic material
6. Low coercive force compared to ceramic and rare earth materials (more subject to demagnetization)
Physical Properties of Cast Alnico |
|
Curie Temperature (℃) |
760-890 |
Max. Operating Temperature (℃) |
450-550 |
Resistivity (μohm.cm) |
47-54 |
Hardness (Hv) |
520-630 |
Density (g/cm³) |
6.90-7.30 |
Relative Recoil Permeability (μrec) |
1.70-4.70 |
Saturation Field Strength (kOe, kA/m) |
2.7-6.3/215-500 |
Temperature Coefficient of Br (%/℃) |
-0.025 ~ -0.02 |
Temperature Coefficient of iHc (%/℃) |
+0.01 ~ +0.03 |
Alnico rotor magnets application
Strong Alnico rotor magnets are designed with multiple poles; each pole alternates in polarity. The hole in the rotor is designed for mounting onto shafts. They are excellent for use in synchronous motors, dynamos, and air turbine generators.
