noun
field system; field magnet
Technical term in electrical engineering for the part of a motor, generator, or other electromagnetic device that produces the magnetic field, as opposed to the armature.
直流モーターでは、界磁に永久磁石を使うことが多い。
In DC motors, permanent magnets are often used for the field system.
界磁巻線に電流を流して磁界を発生させる。
A current is passed through the field winding to generate a magnetic field.