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Block Alnico Magnet For Electro Permanent Magnetic Chuck

1. Material: Alnico magnet

2. Shape: Block shape with hole

3. Dimensions: Customized

4. Grade: Alnico 5,Alnico 5-7,Alnico 6, Alnico 8,Alnico 9 and etc.

Download the magnetic properties of alnico magnet

5. Coating: Without treatment or Polishing process

6. Magnetized: Through thickness or as required

7. Max working Temp.: 450 ℃-550 ℃
8. Tolerance: +/-0.1 mm

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  • Product Detail
  • Technical Specifications

Why alnico magnet is used for electro permanent magnetic chuck as a reversible magnetic core?

        Alnico magnet has low coercive force, this means that its magnetic state is unstable and can be easily altered by an external magnetic field. It can be easily and rapidly magnetized and demagnetized by a short electrical pulse. Based on this characteristic, alnico magnet is selected as the reversible and switchable magnetic core inside the electro permanent magnetic chuck.

 

How alnico magnet works in electro permanent magnetic chuck?

        Alnico magnet work alongside fixed neodymium magnet inside the electro permanent magnetic chuck, when a short electrical pulse flips the alnico magnet polarity to turn the chuck clamping force on or off in fractions of a second.


    

  [The working surface of the chuck]   <--- The workpiece is being held in place here

            ⬇

    ┌───────┬───────┐

    │ Pole  │ Pole  │   <--- ④ Magnetic conductor

    ├───┬───┴───┬───┤

    │ ① │ ② ③ │ ① │   <--- ① NdFeb Magnet / ② Alnico Magnet  / ③ Wire Coil

    │   │ (Wire Coil)│   │

    └───┴───┬───┴───┘

            ⬇

        [Magnetic Yoke Base]     <--- ⑥ Provide a closed magnetic circuit loop


       

        ▶Activation (ON):  A short electrical current pulse aligns the magnetic field of the block alnico magnets with the fixed neodymium magnets, sending strong magnetic force to the electro permanent magnetic chuck surface to grip the metal part.


        ▶Holding State: Power turns off. The magnets hold the part securely with zero electricity used and no heat created.


        ▶Deactivation (OFF):   A reverse electrical pulse flips the block alnico magnets polarity. This redirects the magnetic field inside the metal body of the chuck, releasing the grip on the workpiece.


Click on this link to view the introduction of the Alnico Magnet



Magnetic Properties Of Cast Alnico Magnet
Grade MMPA
Equivalent
Class 		 Remanence
(Br) 		Coercive Force (Hcb) Maximum Energy Products
(BH)max 		Curie Temp.
Tc. 		Max
Working Temp.
Tw. 		Reversible Temp. Coefficient
a(Br)
T kGs KA/m kOe Kj/m³ MGO [°C] [°C] [%°C]
Isotropic *LN9 Alnico3 0.69 6.9 37 0.47 9 1.13 810 450 -0.03
*LN10 0.6 6 40 0.5 10 1.25 -0.03
*LNG12 Alnico2 0.72 7.2 44 0.55 12 1.5 -0.03
*LNG13 0.7 7 48 0.6 13 1.63 -0.03
*LNGT18 Alnico7 0.58 5.8 90 1.13 18 2.2 860 550 -0.03
Anisotropic LNG37 Alnico5 1.2 12 48 0.6 37 4.65 850 525 -0.02
LNG40 1.25 12.5 48 0.6 40 5 -0.02
LNG44 1.25 12.5 52 0.65 44 5.5 -0.02
LNG48 Alnico5DG 1.25 12.5 52 0.65 48 6 -0.02
LNG52 1.3 13 56 0.7 52 6.5 -0.02
LNG60 Alnico5～7 1.35 13.5 56 0.7 60 7.5 -0.02
LNGT28 Alnico6 1.05 10.5 56 0.7 28 3.5 -0.02
LNGT32 Alnico8 0.8 8 100 1.25 32 4.25 860 550 -0.03
LNGT38 0.82 8.2 110 1.38 38 4.75 -0.03
LNGT44 0.88 8.8 120 1.5 44 5.5 -0.03
LNGT48 0.9 9 120 1.5 48 6 -0.03
LNGT36J Alnico8HC 1.1 11 120 1.5 88 11 -0.03
LNGT60 Alnico9 0.9 9 110 1.38 60 7.5 -0.03
LNGT72 1.05 10.5 112 1.41 72 9 -0.03
LNGT88 1.1 11 120 1.5 88 11 -0.03
LNGT92 1.1 11 120 1.5 82 10.25 -0.03

Magnetic Properties Of Sintered Alnico Magnet

Grade 		MMPA
Equivalent
Class 		 Remanence
(Br) 		Coercive Force (Hcb) Maximum Energy Products
(BH)max 		Curie Temp.
Tc. 		Max Working Temp.
Tw. 		Reversible Temp. Coefficient
a(Br)
T kGs KA/m kOe Kj/m³ MGO [°C] [°C] [%°C]
Isotropic *FLN10 S-Alnico3 0.65 6.5 52 0.65 10 1.25 750 450 -0.03
*FLNG12 S-Alnico2 0.72 7.2 52 0.65 12 1.5 -0.03
*LNGT18 S-Alnico7 0.6 6 92 1.15 18 2.25 860 550 -0.03
Anisotropic FLNG35 S-Alnico5 1.15 11.5 52 0.65 35 4.4 850 510 -0.02
FLNGT28 S-Alnico6 1.05 10.5 60 0.75 28 3.5 860 550 -0.02
FLNGT40 S-Alnico8 0.88 8.8 120 1.5 40 5 -0.02
FLNGT42 1 10 105 1.3 42 5.25 -0.02
FLNGT44 0.92 9.2 120 1.5 44 5.5 -0.02
FLNGT48 0.95 9.5 128 1.6 49.5 6.2 -0.02
FLNGT36J S-Alnico8HC 0.75 7.5 140 1.75 36 4.5 -0.02

Mechanical Physical Properties Of Cast Alnico Magnet
Curie Temperature 760-890℃
Max. Operating Temperature 450-550℃
Resistivity 47-54μOhm.cm
Vickers Hardness 520-630Hv
Density 6.9-7.3g/cm³
Relative Recoil Permeability 1.7-4.7μrec
Saturation Field Strength 2.7-6.3kOe/215-500kA/m
Temperature Coefficient of Remanence (Br) -0.025~-0.02%/℃
Temperature Coefficient of Remanence (Hcj) +0.01~0.03%/℃ 

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