Electromagnets are classified as either resistive or superconducting based on the coiling wires used. Dexter’s experience lies in resistive electromagnet technologies.
Electromagnets are comprised of two main elements to produce a magnetic field when powered: the coil(s) and a current source.
Their general purpose is to provide a magnetic force to actuate mechanical components. The field can be manipulated by a change in current, core material, or the number of wire loops.
In contrast to permanent magnets, electromagnets can be switched off and don’t require special rare earth materials. However, sometimes a selection of a unique core material can aid in a higher field output. The three main power setups of electromagnets are Low Frequency AC, DC, and Pulse.
Electromagnets are very widely used in electric and electromechanical devices, including:
|• Motors and generators.||• Actuators, such as valves|
|• Transformers||• MRI Machines|
|• Relays||• Electric bells and buzzers.|
|• Loudspeakers and headphones||• Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks|
- Dynamically controllable field strength
- Can be turned off (safety, reduce power consumption)
- Can feasibly achieve higher strengths
- Assembly of device is safer
- Electromagnets don’t risk demagnetization the way permanent magnets do
- Constantly maintains magnetic field without a drop in strength
- Can be lightweight and compact due to higher energy density of magnet material
- Can be a cost-effective solution (especially since no power is needed to run/operate)
- No maintenance or cooling required as magnets do not produce heat from an energy source