The basic working principle of a
diesel generator setis to generate electrical energy by driving an AC generator through a diesel engine. Specifically, diesel engines generate heat energy by burning diesel, which is converted into mechanical energy to drive the rotation of an AC generator. AC generators use the principle of electromagnetic induction to convert mechanical energy into electrical energy for output.
The working principle of an AC generator mainly includes the following aspects:
1. Establishment of magnetic field: During the operation of the generator, the excitation winding establishes a magnetic field with the same polarity, namely the main magnetic field, through direct current excitation current.
2. Cutting motion: The prime mover (such as a diesel engine) drives the rotor to rotate, and the rotor magnetic field rotates with the shaft and sequentially cuts the stator windings of each phase.
3. Current carrying conductor: After the generator runs, the three-phase symmetrical current group acts as the power winding, generating induced electromotive force or induced current.
4. The generation of alternating electromotive force: By the relative motion between the rotor magnetic field and the stator winding, mechanical energy is converted into electrical energy. When the rotor rotates, the induced electromotive force in the stator winding changes periodically and outputs an alternating current.
5. The working principle of the starter motor: The starter motor is usually composed of a DC motor, a transmission mechanism, and a control device. When it is necessary to start the diesel engine, the starter is powered by the battery, and the driving gear meshes with the flywheel of the diesel engine. The high-speed rotating electric motor drives the crankshaft of the diesel engine to rotate, thereby starting the diesel engine.
The overall structure of a diesel generator set includes:
Diesel engine: provides power and drives the generator to rotate.
AC generator: converts mechanical energy into electrical energy.
Control system: including speed regulator and excitation control to ensure stable voltage and frequency.
Protection device: Ensure that the equipment can automatically cut off the power supply in case of abnormal conditions, protecting the safety of the equipment.
Through the collaborative work of these components, diesel generator sets can efficiently and stably provide power output.
