Magnets for Loudspeaker  Manufacturers, Traders, Suppliers

Different type of PERMANENT MAGNET: NdFeB magnets, Ferrite magnets, Alnico magnets，SMCO magnets，etc.,
Sintered NdFeB Magnets (also known as Neodymium magnets ,Neo magnets,or NIB) is the most powerful and advanced permanent magnet today .Sintered NdFeB magnets has the high remanence, high coercive force and high energy. It has very high performance and high cost ration. It can be easily formed into various sizes and different shapes, which are disc, ring, block, segment, special and so on.
Due to their outstanding magnetic properties (high remanence Br 1.1-1.5 T, middle high coercivity Hcj 800-3000 kA/m^3 and high maximum energy product (BH)max 220-430 kJ/m^3) together with competitive cost, sintered NdFeB magnets are widely applied in DC motors, servo motors, stepper/stepping motors, synchronous motors, linear motors, voice coil motors (VCMs), wind turbines and generators, magnetic resonance imaging (MRI), electric power steering (EPS), magnetic separation, etc.

CJ Magnet can provide you with Neodymium, Ferrite, Samarium Cobalt, Alnico rare earth permanent magnets and magnet assemblies.We can also provide you with customized services.

The speaker magnets on the market mainly include AlNiCo magnets, ferrite magnets, and NdFeB magnets:
Alnico magnet is the earliest magnet used in speakers. The disadvantage is that the power is small, hard, and brittle, and the processing is very inconvenient. In addition, cobalt resources are scarce, and the price of AlNiCo magnets is relatively high. From the perspective of cost performance, AlNiCo magnets are rarely used for speaker magnets.

Ferrite magnets have relatively low magnetic properties and require a certain volume to meet the driving force of the speaker, so they are generally used in larger audio speakers. The advantages of ferrite magnets are that they are cheap and cost-effective; the disadvantages are that they are larger in size and smaller in power.

NdFeB magnets have far superior magnetic properties than AlNiCo magnets and ferrite magnets and are currently the most used magnets on speakers, especially high-end speakers. Their advantages are their small size and high power under the same magnetic flux while their disadvantages are that they contain rare earth elements, so their price is higher.

Neodymium Magnets Features & Characteristics
Grades & Materials - Neodymium magnet materials in both standard and premium grades for reduced production and lead times. We offer sintered neodymium magnets in grades ranging from N30 to N55.
Sizes & Shapes - Sizes for standard Neodymium Iron Boron rare-earth magnets range from a few millimeters to approximately 150 mm, while assemblies can weigh up to several tons. Standard shapes include discs, blocks, rings, and arc segments in various sizes and grades. Non-standard shapes and sizes can be custom fabricated exact specifications from raw stock.
Temperature Considerations - Neodymium magnets are temperature sensitive. For applications in which the magnet may be exposed to temperatures in excess of about 250°F (120°C), careful consideration must be given to the choice of magnet grade and the magnetic circuit.
Manufacturing Methods - Due to the relatively brittle nature and high-magnetic strength of NdFeB magnets, cutting and grinding should be done prior to magnetization. We are fully equipped to machine these materials to virtually any shape and size for your project’s specialty requirements using our in-house grinding and EDM facilities. Finishing to tolerances of +/-0.05mm can be achieved, as required.
Surface Treatments - Neo magnets are susceptible to oxidation, so painting, epoxy coating, or plating is highly recommended to prevent corrosion. The common surface treatments include nickel plating, zinc, or epoxy coatings.
Handling & Storage - Neodymium materials are relatively brittle, but are magnetically very strong. They must therefore be handled carefully to avoid injury to personnel and damage to the magnets.

Neodymium magnets have replaced alnico and ferrite magnets in many of the myriad applications in modern technology where strong permanent magnets are required, because their greater strength allows the use of smaller, lighter magnets for a given application. Some examples are:

• Head actuators for computer hard disks
• Mechanical e-cigarette firing switches
• Locks for doors
• Loudspeakers and headphones
• Mobile phone speakers, taptic feedback and auto focus actuators
• Magnetic bearings and couplings
• Benchtop NMR spectrometers
• Electric motors
• Electric generators for wind turbines (only those with permanent magnet excitation)
• Voice coil
• Retail media case decouplers
• In process industries, powerful neodymium magnets are used to catch foreign bodies and protect product and processes
• Identifying precious metals in various objects (cutlery, coins, jewelry etc.)

Sintered NdFeB magnet is the most magnetic permanent magnet materials in the world today. With their excellent permanent magnet properties that surpass traditional materials, it is widely used in VCM, mobile phones, MRI, audio equipment, automotive motors and other fields, is an indispensable functional material for modern industry.

Please see File as attached below.