AlNiCo Bar&cylinder Magnets For Sensor

Type:AlNiCo bar&cylinder magnets for sensor
Samples:Available
MOQ:Depending on the size of the magnet
OEM service:Yes
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Product Details


AlNiCo bar&cylinder magnets for sensor


Raw materials for Aluminium-Nickel-Cobalt Magnets (AlNiCo) are aluminum, nickel, cobalt, iron, copper and titanium. Aluminium-Nickel-Cobalt Magnets are produced in a sintering – casting procedure. The hard material needs to be processed by grinding to be cost-effective. Due to its specifications, the best dimension is a remarkably longer length than its diameter. In combination with reed sensors/switches, we recommend a length/diameter ratio of more than 4. AlNiCo magnets have excellent temperature stability. Cylindrical AlNiCo magnets can be used with all Standex Electronics reed sensors/switches without any problems.

The most widely used magnetic sensors are variable reluctance, Hall effect and reed switch sensors. Automotive crash safety systems use sensors based on a holding mechanism that can be closed or open using electrical current hall effect switch magnet sensor

alnico magnets
alnico rod magnets



alnico sensor magnets.jpg


Features
Aluminium-Nickel-Cobalt Magnets
Working Temperature from -250 up to 450°C
Low-Temperature Coefficient
Adjustable Magnetic Moment
Easy to Adjust
The important ratio between diameter to length (1×4) for better stability


Typical Magnetic and Physical Properties of Alnico Magnet Material

Magnetic Materials

Density

Maximum
Energy
Product
BH (max)

Residual
Induction
Br

Coercive
Force
Hc

Intrinsic
Coercive
Force
Hc

Normal
Maximum
Operating
Temp.

Curie
Temp.

lbs/in

g/cm

MGO

Gauss

Oersteds

Iersteds

Alnico 5 (cast)

0.264

7.3

5.5

12800

640

640

975

525

1580

860

Alnico 8 (cast)

0.262

7.3

5.3

8200

1650

1860

1020

550

1580

860

Alnico 5 (sintered)

0.250

6.9

3.9

10900

620

630

975

525

1580

860

Alnico 8 (sintered)

0.252

7.0

4.0

7400

1500

1690

1020

550

1580

860


Tolerances
Unless otherwise specified, our tolerances on alnico material meet and often exceed International Magnetics Association (IMA, formerly MMPA) standards. For unfinished surfaces (as cast) the following tolerances apply: 0-1” ± .016 1-3” ± .031 3-5 ±.047 
5-7” ± .062 7-9” ±.078 9-12” ± .094

Finished surfaces are normally ground to ± .005 (See MMPA standards for more details.)


Magnetizing and Handling
Magnetizing is done after the magnet has been machined to the correct tolerances. Care should be taken when handling alnico material since it is brittle and can chip or break if dropped on a hard surface. Also, because it has a low resistance to demagnetization, it will lose power if it is stored improperly (poles repelling each other). For best results, store magnetized alnico so that pieces are attracting each other, or with a steel keeper. 


Machining
Alnico is a very hard and brittle material and does not lend itself to conventional machining. ALL Magnetics Inc. employs experienced machinists and the proper equipment to grind alnico to its required dimensions.


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