Kenttävirran

Kenttävirran, also known as the field current, is a term used in the context of electrical engineering and power systems. It refers to the current that flows through the field windings of an electric machine, such as a generator or a motor. The field current is responsible for creating the magnetic field necessary for the operation of these machines.

In a generator, the field current is used to produce the magnetic field that induces an electromotive force (EMF) in the armature windings, which in turn generates electrical power. The magnitude and direction of the field current can be adjusted to control the output voltage and power of the generator.

In a motor, the field current is used to create the magnetic field that interacts with the current in the armature windings to produce mechanical torque. By controlling the field current, the speed and torque of the motor can be regulated.

The field current is typically supplied by a separate excitation system, which can be a direct current (DC) source or a rectified alternating current (AC) source. The design and control of the field current are crucial for the efficient and reliable operation of electric machines in various applications, including power generation, electric vehicles, and industrial machinery.