Uwandy

Uwandy-logo_3500x1000
E-mail: [email protected]

Motor Magnets - Arc Magnets, Hollow Cylindrical Magnets, Block magnets

Manufacture Capacity and Product Details

Composite:Nd(Dy, Tb), Fe, B, Pr, Al, Cu etc.Chemical Formula:Nd2Fe14B
Lead Time:7-25 days depending on quantityTolerance:±0.05mm
Grade:N, M, H, SH, UH, EH, AHDensity:7.4-7.65 g/cm³
Surface Treatment:Zn, Ni, NiCuNi, Cr, Epoxy, Ag, Au etc.Default Fillet:r=0.2-0.5mm
Working Temperature:80℃-240℃ depending on different gradesCertifications:RoHS, SGS, REACH, MSDS
MOQ:≥1 pieceCountry of Origin:China
Customization:Shape, Package, LogoBrand Name:Uwandy Magnets

Payment & Service

Payment

amount<$500

100% in advance

PayPal, T/T, WU

$500<amount<$3000

100% in advance

T/T, WU, D/P

$3000<amount<$30000

50% deposit in advance,  balance before shipment

T/T, WU, D/P

$30000<amount

30% deposit in advance, 50% before shipment, 20% balance to be negotiated

T/T, D/P, L/C

More better payment tems can be offered for regular customers

Service

1. We provide CAD drawing service for your order

2. We can offer suggestions on grade selection or better solutions for your project

3. We can offer free samples(value less than $50) to regular customers

Safety Warning

Neodymium magnets are brittle, super strong, easily shattered and broken, Here are some tips that will help when working with neodymium magnets:

1. Wear eye protection and gloves when working with magnets if necessary.

2. Slide the magnets rather than pulling off the stack.

3. Keep away magnets from kids in case accident happens.

4. Keep away magnets from objects that might cause damage like smartphone, GPS, pacemaker or other electronic devices.

5. Do not put magnets in high temperature environment, magnets will demagnetize while they are over heated.

6. Magnets can rust and get scratched because magnets contain iron and mostly are nickel plated.

Packing & Shipping

General Packing

1.Clear plastic bag→Small white box→Foam padding carton(36x24x16cm)

2. We will insert at least 6 pieces of steel sheets to block magnetic field for air transport

Shipping Method

Express, Air, Sea, Train, Truckload

Shipment Terms

EXW, FCA, FAS, FOB, CFR, CIF, CPT, CIP, DAT, DAP, DDP etc.

package

 

Motor Magnets

Motor magnets are permanent magnets applied in electric motors, utilizing the principle of repulsion between like poles and attraction between opposite poles to generate power. The basic principle of an electric motor involves the interaction between an electromagnet and a permanent magnet, converting electrical energy into kinetic energy. Electric motor magnets play the role of these permanent magnets in this process.

1 bldc motor
2 bldc motor
linear motor

What kind of magnetic materials are suitable for use in motors?

Electric motor magnets come in various materials, including neodymium iron boron magnets, samarium cobalt magnets, ferrite magnets, and others. Now, let’s discuss the advantages and disadvantages of these different types of magnets:

  • The advantages of neodymium magnets include strong magnetic performance and a moderate price. However, they have some drawbacks, such as high machining complexity. Low-performance magnets are more prone to breaking and corrosion, requiring protective coatings. Neodymium magnets also have a low Curie temperature, which can be improved by adding lanthanide metals like dysprosium or terbium.
  • The benefits of samarium cobalt magnets are their high Curie temperature, ease of machining, and magnetic properties that are only slightly inferior to neodymium magnets. The downside is their relatively high cost.
  • The benefits of ferrite magnets include a high Curie temperature, ease of machining, corrosion resistance, and affordability. The drawback is their relatively lower magnetic performance.
neodymium magnet
Neodymium Magnets
smco magnets
SmCo Magnets
ferrite magnets
Ferrite Magnets

In conclusion, the choice of material for electric motor magnets depends on the specific requirements. Typically, neodymium magnets and samarium cobalt magnets are commonly used in high-speed motors, while ferrite magnets are frequently employed in low-speed motors. If you are pursuing high performance and have a sufficient budget, both neodymium and samarium cobalt magnets fall within the available options. For those seeking cost-effectiveness, ferrite magnets and lower-grade neodymium magnets are also viable choices. Currently, the most widely used electric motor magnet in production environments is neodymium magnet.

Common shapes of neodymium magnets in motor applications

Electric motor magnets come in various shapes, including arc-shaped, square, and cylindrical magnets with holes. Among these, arc-shaped magnets and magnets with holes are often used for rotors or stators, while square magnets are commonly employed on the tracks of linear motors.

Motor Magnet 2
Arc Magnets
Motor Magnet 4
Hollow Rod Magnets
Motor Magnet 5
Block Magnets

How should I choose a coating for neodymium magnets used in motor applications?

Common coatings for neodymium magnets include zinc, nickel-copper-nickel, and epoxy. When selecting a coating for electric motor magnets, the initial consideration should be the intended usage environment for the magnets. Will the motor operate in a dry or relatively humid environment? If the motor’s working environment is not prone to magnet corrosion, both zinc and nickel coatings can be viable options. However, in more humid environments, it’s advisable to opt for coatings like epoxy, which offer higher resistance to salt spray corrosion.

1. zn coated neodymium magnets
Zn Coated
2. nickel coated neodymium magnets
Nickel Coated
3. epoxy coated neodymium magnets
Epoxy Coated

What adhesive should be used for bonding neodymium magnets in motor applications?

The adhesive commonly used to secure neodymium magnets in electric motors is acrylic structural adhesive. After electroplating, the surface coating of neodymium magnets becomes smoother than the original material. At this point, regular adhesive is unable to effectively bond the magnet to the stator or rotor.We recommend the following 5 best acrylic adhesive brands:

  1.  Loctite adhesive
  2.  3M adhesive
  3.  Gorilla glue
  4.  E6000 craft adhesive
  5.  Permatex adhesive

When buying adhesive for glueing motor magnets, please ensure that it is acrylic adhesive, and it’s advisable to contact the manufacturer’s customer service before making a purchase.

acrylic adhesive for motor

What sizes of motor magnets can Uwandy produce?

Uwandy can produce magnets in various sizes. Typically, for magnetization along the thickness direction, the thickness should not exceed 50mm, as exceeding this limit can make it challenging to change the magnetization direction between the north and south poles at the magnet’s center. If you need square magnets, the length and width of the magnet generally should not exceed 100mm. Please send us your drawings to [email protected] for evaluation, and we will assess whether we can manufacture the size you require and provide you with a quotation.

ShapesDiameterThickness
Disc/Rod Magnet4-100 mm1-50 mm
ShapesLengthWidthHeight
Rectangular/Block Magnet1-100 mm1-100 mm1-50 mm

Magnetization direction of arc magnets, hollow cylindrical magnets and block magnets

The magnetization direction for arc magnets is typically the vertical direction at the midpoint of the curved surface. Magnetizing arc magnets does not require custom magnetizer and fixtures. In contrast, the magnetization direction for rod magnets with thru hole involves axial multipole and radial ring magnetization, which requires the customization of corresponding magnetizer and fixture. The cost for mangetizer and fixture is usually above $2,000, making it relatively expensive. Therefore, before proceeding with a prototype, it’s advisable to provide the quantity for bulk orders, the annual demand, and inquire about the pricing for bulk orders.

magnetization direction of arc magnet - through thickness
Magnetized through thickness
magnetization direction of hollow cylindrical magnet - radial magnetized
Radial magnetized
magnetization direction of block magnet - through thickness
Magnetized through thickness

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Rated 4.0 out of 5
October 2, 2023

powerful neodymium magnet!

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Rated 5.0 out of 5
October 2, 2023

Strong disc magnets!

Chris Nelson
4.5
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4.5 out of 5 stars (based on 2 reviews)
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