FIXMAN New Product- Generator Introduction

We are professional tool manufacturer since 1995. Our brand, FIXMAN is the leading brand in tool field. FIXMAN focus on professional tools in automotive, constructionindustrial, and home use field. At present, FIXMAN registered in 138 countries and areas and sell to 60 countries and areas. We provide a variety product range of over 6,000 items and there are more than 1,000 global network stores that are selling different kinds of FIXMAN Products.

FIXMAN keeps expanding our product range to satisfy the different kinds of requirement from our customers.

 

 

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A generator is a mechanical device that converts other forms of energy into electrical energy. It is driven by water turbines, steam turbines, diesel engines or other power machinery, and converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and then transmits it to the generator. Converted into electrical energy by a generator. Generators are widely used in industrial and agricultural production, national defense, science and technology and daily life.

There are many forms of generators, but their working principles are based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its construction is: use appropriate magnetic and conductive materials to form magnetic circuits and circuits that conduct electromagnetic induction with each other to generate electromagnetic power and achieve the purpose of energy conversion.

 

working principle

The generator is mainly composed of stators, rotors, end covers, brushes, bases and bearings.

The stator is composed of a base, a stator core, a wire-wrapped winding, and other structural parts that fix these parts.

The rotor is composed of rotor iron core, rotor magnetic poles (with yoke and magnetic pole winding), slip ring, (also known as copper ring, slip ring), fan and rotating shaft.

The stator and rotor of the generator are connected and assembled through bearings, frame and end cover, so that the rotor can rotate in the stator, and a certain excitation current is passed through the slip ring to make the rotor become a rotating magnetic field, and the stator coil performs the movement of cutting the magnetic lines of force. , Thereby generating an induced potential, which is drawn through the terminal and connected to the loop, and then a current is generated. Since there is an open circuit at the connection between the brush and the rotor, the rotor rotates in a certain direction and generates alternating current. Therefore, the alternating current in the circuit such as home circuit, referred to as alternating current. The frequency of the output current of the Chinese power grid is 50 Hz.

A generator that matches a steam turbine generator and a steam turbine. In order to obtain higher efficiency, steam turbines are generally made of high-speed, usually 3000 rpm (frequency of 50 Hz) or 3600 rpm (frequency of 60 Hz). The speed of the steam turbine in nuclear power plants is low, but it is also above 1500 rpm. In order to reduce the mechanical stress caused by centrifugal force and wind friction, the rotor diameter of the high-speed turbo-generator is generally small and the length is relatively large, that is, a slender rotor is used. Especially for large-capacity high-speed units above 3000 rpm, the diameter of the rotor is strictly limited due to the material strength, and generally cannot exceed 1.2 meters. The length of the rotor body is restricted by the critical speed. When the length of the body reaches more than 6 times the diameter, the second critical speed of the rotor will be close to the operating speed of the motor, and greater vibration may occur during operation. Therefore, the size of the rotor of a large-scale high-speed turbo-generator is strictly limited. The rotor size of an air-cooled motor of about 100,000 kilowatts has reached the above-mentioned limit size. To increase the motor capacity, it can only be achieved by increasing the electromagnetic load of the motor. For this reason, the cooling of the motor must be strengthened. Therefore, all turbo-generators with 50,000 to 100,000 kilowatts or more use hydrogen cooling or water cooling technology with better cooling effect. Since the 1970s, the maximum capacity of steam turbine generators has reached 1.3 to 1.5 million kilowatts. Since 1986, major breakthroughs have been made in the research of high critical temperature superconducting materials. Superconducting technology is expected to be applied in steam turbine generators, which will produce a new leap in the development history of steam turbine generators.

 

 


Post time: Oct-06-2021