When the crankshaft of diesel engine rotates, it drives the generator to rotate and generate electricity. There are direct current generator and alternating current generator. DC generator is mainly composed of generator casing, magnetic pole iron core, magnetic field coil, armature and carbon brush. The alternator is mainly made of magnetic materials, several permanent magnets (called rotors) with alternating north and south poles, and armature coils (called stators) made of silicon cast iron and wound with series coils. The working principle of DC generator is different from that of AC generator, but it achieves the goal of power generation.

Diesel generator set is a kind of small power generation equipment, which uses diesel oil as fuel and diesel engine as prime mover to drive generator to generate electricity. The whole unit is generally composed of diesel engine, generator, control tank, fuel tank, storage battery for starting and control, protection device, emergency cabinet and other components. The whole can be fixed on the foundation for positioning, and can also be installed on the trailer for mobile use.

Diesel generator set is a kind of non continuous operation power generation equipment, if the continuous operation for more than 12 hours, its output power will be about 90% lower than the rated power. If users need to use it continuously for a long time, it is necessary to configure a common type of generator set, that is to say, the power drop of the unit should be taken into account for a long time. The relationship between common power and standby power is: for example, users need 100kW diesel generator set, and the standby power of 100kW diesel generator set is 100kW * 110% = 110KW. That is to say, the common power of 100kW diesel generator set is 90kw. Although the power of diesel generator set is low, due to its small size, flexibility, portability, complete set, easy operation and maintenance, it is widely used in mines, railways, field construction sites, road traffic maintenance, as well as factories, enterprises, hospitals and other departments as a backup power source or temporary power supply.

Diesel generator set is a type of AC power supply equipment of self provided power station. It is a small independent power generation equipment. It uses internal combustion engine as power and drives synchronous alternator to generate electricity. If the brushless synchronous alternator is installed in the same axis with the crankshaft of the diesel engine, the rotation of the diesel engine can be used to drive the rotor of the generator. Using the "electromagnetic induction" principle, the generator will output the induced electromotive force, and the current can be generated through the closed load circuit. Diesel generator set is composed of internal combustion engine and synchronous generator. The maximum power of internal combustion engine is limited by mechanical load and thermal load of parts, which is called rated power. The rated power of AC synchronous generator refers to the rated power output under rated speed and long-term continuous operation. Generally, the output rated power of diesel engine is equal to that of synchronous alternator Constant power is called matching ratio.

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