exciter

An exciter is a type of DC generator that is usually mounted on the same axis as the motor. As the rotor shaft rotates, it drives the exciter to rotate as well. The alternating current generated inside the exciter is converted into direct current by a rectifier at its ends, and this direct current is then sent to the rotor of the generator through brushes and slip rings in order to create a direct current magnetic field. As the rotor rotates, the magnetic field lines move relative to the stator coils, and the movement of these magnetic field lines through the coils induces a voltage in them.

New hydrogen generators are generally reciprocating machines, and since these machines have high power, they must be driven by synchronous motors with a steep characteristic curve and a high power factor. A synchronous machine cannot start on its own like a three-phase asynchronous motor; it is usually started in an asynchronous manner. The rotor has two sets of windings: one synchronous winding and one asynchronous winding. During startup, the asynchronous winding is used for soft starting, which enables the rotor to acquire rotational speed. The exciter is a generator that is coaxial with the motor. As the rotor rotates, it moves relative to the stator windings of the exciter through which direct current flows, thereby cutting through magnetic field lines and inducing alternating current in the rotor of the exciter. This alternating current is then rectified into direct current and supplied to the rotor of the synchronous machine. In this way, currents flow in both the stator and rotor of the synchronous machine, and the magnetic fields generated are perpendicular to each other, allowing the rotor to keep rotating. Synchronization is achieved through the control of the excitation controller and the rectification module.