Neodymium pot magnets

Composition and construction of NdFeb pot magnets

These super-strong pot magnets are made of the alloy neodymium-iron-boron - (NdFeB) - which Goudsmit markets under the brand name Neoflux®. The shell provides magnetic shielding. Goudsmit supplies neodymium pot magnets with a brass or steel shell. The holding surface is covered with a protective coating to prevent corrosion.

Magnetic short circuit

To prevent loss of holding force due to magnetic short-circuit, neodymium magnets with a brass shell may not be pressed directly into steel. Always maintain a minimum distance between the brass shell of the pot magnet and the steel. Contact our experts for specific recommendations.

Operating temperature and loss of magnetic strength

Neodymium cylindrical, flat pot magnets have a maximum operating temperature of up to 80 °C. When heated to this temperature, the magnet loses 15 to 20% of its magnetic force. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature.
External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.

Ferrite pot magnets

Composition and construction of ferrite pot magnets

Good magnetic properties, affordably priced. Ferrite pot magnets, also referred to as ceramic pot magnets, are fitted with a steel pot that provides shielding of the magnetic field. Flat ferrite pot magnets require only a minimal installation height. This provides constructive advantages. Ferrite pot magnets are corrosion-resistant and therefore do not require additional coating on the magnet surface.

Operating temperature and loss of magnetic strength

Ferrite pot magnets have an operating temperature of up to 200 °C. When heated to this temperature the magnet loses 30 to 40% of its magnetic force. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature. The magnetic force of these pot magnets is lower than that of neodymium pot magnets.
External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.

Samarium-cobalt pot magnets

Composition and construction of SmCo pot magnets

Second strongest type of magnet. Samarium-cobalt pot magnets offer the unique combination of high magnetic force and high operating temperature. These super-strong pot magnets are made of an alloy of samarium and cobalt. The holding force at room temperature is 5 times higher than that of ferrite pot magnets.

With the exception of Neoflux® pot magnets, samarium cobalt pot magnets are the strongest that we have in our product range.

Installation and demagnetization

Samarium cobalt pot magnets are very stable and are difficult to demagnetize in a strong alternating current field. The steel pot does not provide any magnetic shielding. Therefore, these pot magnets may not be built into steel components without taking special measures. The distance between the steel component and the samarium cobalt pot magnet must be 1.5 to 6 mm, depending on the size of the pot magnet.

Operating temperature and loss of magnetic strength

Samarium cobalt pot magnets have an operating temperature of up to 200 °C. When heated to this temperature, the magnet loses 15 to 20% of its magnetic strength. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature.

External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.