neodymium magnets

Customized Permanent AlNiCo Rotor Magnets

AlNiCo (Aluminium, Nickel, Cobalt and Iron alloy) is obtained by casting process, shaped in cheap phenolic resin sand moulds. It is the oldest and most stable magnetic material, with temperature coefficients of -0,03%/°C (Br) and -0,02%/°C (HcJ). It can operate in environments up to 500 °C with a very good resistance against corrosion, therefore coatings are seldom required. For multi-pole magnetizing patterns isotropic material is available. Higher energy anisotropy is obtained by external coils orientation during the thermal treatment.
  • Item NO.:

    BHAM-01
  • Lead Time:

    30-35 days
  • Product Orgin:

    China
  • Shipping Port:

    Shanghai
  • min order:

    100pcs
  • Grade:

    Alnico 5
  • Product Detail

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.

Customized Shape AlNiCo Magnets
Rare Earth Permanent Sintered Ring AlNiCo Magnets
Products description

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.

Customized Permanent AlNiCo5 Magnet for Motors


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