The Magnetising Process
The majority of Hirst Magnetic Instrumens Ltd. t magnetising systems contain capacitors which are charged to a high voltage (800 or 3,000 volts) and discharged through magnetising fixtures or coils. This capacitive discharge magnetising system allows the end user to magnetise permanent magnets individually or in product assemblies. The right choice of system is influenced by a number of factors, as highlighted in more detail in the contents below.
In order to magnetise an item it is necessary to expose it to a sufficiently strong magnetic field. The magnetic field is generated by passing a large current through a special coil of wire known as a fixture.
Each magnet is created when a suitable piece of material is placed in the centre of the wire coil and subjected to a strong magnetic field generated within the fixture.
The fixture is often designed specifically for the application ensuring it generates the required field over the specific area/volume of the magnet. The fixture needs to be protected against damage caused by high voltages and currents, excess temperatures and mechanical stresses generated during magnetising.
Many types of magnetising pattern can be produced, each one being associated with a specific industry application.