AlNiCo magnet is produced primarily from Aluminum (Al), Nickel (Ni), Cobalt (Co), and Iron (Fe). Therefore, alloying elements like Copper (Cu), Titanium (Ti), and Niobium (Nb) are added to the composition to enhance coercivity of AlNiCo. AlNiCo rod magnet can be manufactured by either casting or sintering technology. AlNiCo rod magnet is certainly specified according to diameter (D) x length (T), where the length should exceed the diameter to avoid self-demagnetization. AlNiCo rod magnet is commonly utilized by both industrial and civilian applications like meters, instruments, and sensors, then representative application includes guitar pickup magnets and ABS wheel speed sensor magnets.
Permeance Coefficient of AlNiCo Rod Magnet
Permeance coefficient (Pc) of ordinary axially magnetized cylinder magnet can be determined by the equivalent magnetic charge method, where L, Le, and r is the length, effective length, and radius of magnet, respectively. Permeance coefficient is a function of L/D ratio. Le can be seen as L when recoil permeability μrec equal to 1. While μrec of ferrite magnet and rare earth magnet is very close to 1. For AlNiCo, each grade has its own μrec value and thus possesses different effective length factor k. AlNiCo magnet is susceptible to demagnetization due to lower coercivity and larger μrec, then a higher L/D ratio can improve operating point on the B-H curve, and this is the reason why AlNiCo magnet is generally long in length.
Permeance Coefficient Calculator of AlNiCo Rod Magnet
Notes:
- Calculations are based on the equivalent magnetic charge method.
- Effective length factor k in the calculator refer to Arnold Magnetic Technlogies.
- The calculation results are solely for reference.
