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Engine driven by an internal combustion engine. It starts fast, easy to operate. However, the cost of generating electricity from internal combustion engines is high, so diesel generating sets are mainly used as emergency backup power sources or in areas where mobile plants and some large power grids have not yet reached the destination. Diesel generator speed is usually 1000 rev / min or less, the capacity of several thousand kilowatts to several thousand kilowatts, especially 200 kilowatts below the unit more applications. It is relatively simple to make. The torque output from the diesel shaft is periodically pulsating, so the generator is operating under severe vibrations. Therefore, the diesel generator structural components, especially the shaft to have sufficient strength and rigidity to prevent these components due to vibration and fracture. In addition, in order to prevent the torque ripple caused by the generator rotation angular velocity is not uniform, causing voltage fluctuations, causing light flashing, diesel generator rotor also requires a larger moment of inertia, shaft Shaft and should make the inherent torsional frequency and Diesel torque ripple in any of the alternating components of the frequency difference of more than 20%, in order to avoid resonance, resulting in shaft accident.

Diesel generator set is mainly composed of diesel engine, generator and control system. Diesel engine and generator have two kinds of connection modes. One is flexible connection, that is, the two parts are connected by coupling. The other is rigid connection. The generator steel connecting piece is connected with the diesel flywheel disk. At present, the rigid connection is more and more. The diesel engine and the generator are connected and installed on a common chassis, and then matched with various sensors, such as water temperature sensors, , The diesel engine operating status is displayed to the operator, and with these sensors, you can set an upper limit, when it reaches or exceeds this limit when the control system will alarm in advance, this time if the operator did not take measures to control the system will Automatically stop the unit, diesel generator is to take this approach to play a role in self-protection. Sensor from the role of receiving and feedback of various information, the real display of these data and the implementation of protection is the unit's own control system.