Motor insulation levels: A, E, B, F, H. Motor insulation levels are divided into 5 levels: A, E, B, F and H. Resistance grades The heat resistance of the insulating materials used are divided into degrees A, E, B, F and H. The permissible temperature rise refers to the limit of the increase in motor temperature compared to the ambient temperature. The level of motor insulation is closely related to the insulating material used. The better the insulating material, the higher the level of insulation.
At present, high-quality H-class water-based insulating paint insulation material 9019W is often used for impregnated insulation and moisture-proof treatment in motors high and low voltage at high speed and variable frequency, air-conditioning of motors, transformers and inductance coils of electrical appliances.
Detailed informationPeople stipulated 7 temperaMaximum allowable temperatures for different insulating materials based on their ability to withstand high temperatures. They are arranged according to temperature: Y, A, E, B, F, H and C. . Their admissible working temperatures are: 90, 105, 120, 130, 155, 180 and above 180°C.
Therefore, Class B insulation indicates that the heat resistance temperature of the insulation used by the generator (motor) is 130°C. When the generator is operating, the user must ensure that the generator's insulation material does not exceed this temperature to ensure normal generator operation.
Baidu Encyclopedia - Engine Insulation Level
Is it normal for the car generator to heat up
Common causes and solutions to an excessively high temperature rise of the generator< /p>
(1) Reason: The overload time is too long.
Handling: Reduce load.
(2) Raisound: friction between the stator and rotor core.
Treatment: Most of the reasons are caused by bearing damage. The machine must be stopped immediately to repair or replace the bearing.
(3) Reason: There is a short circuit or leakage in the stator winding.
Treatment: Check the stator winding.
(4) Reason: Poor heat dissipation in the air duct.
Treatment: Check whether the air duct is blocked and the fan is damaged.
(5)Cause: Bad rectification state.
Processing: If it is a silicon rectifier, check the silicon components. Check if the field circuit is grounded.
(6) Reason: The engine is wet.
Processing: Drying can be done by short circuit current method.
If the inlet air temperature is too low, what impact will this have on the generator?
ItIt is normal for the generator to generate heat during operation.
The car generator is the main source of power for the car. When the engine is running normally, its function is to power all electrical equipment (except the starter) and charge the battery at the same time. .
Based on the three-phase stator winding of an ordinary alternator, the number of winding turns is increased and the terminals are taken out, and a set of three-phase rectifier bridge is added. At low speed, the original winding and the additional winding are output in series, while at higher speed, only the original three-phase winding is output.
Detailed information:
The gasoline engine drives the generator to operate, converting gasoline energy into electrical energy.
In the cylinderfrom the gasoline engine, the mixed gas burns violently, expands quickly in volume, and pushes the piston down to do the work.
Whether it is a diesel generator or a gasoline generator, each cylinder performs work in a certain order. The thrust acting on the piston becomes the force that causes the crankshaft to rotate through the connecting rod, thus driving the engine. crankshaft to rotate. By installing the brushless synchronous alternator coaxially to the crankshaft of the electric machine, the rotation of the electric machine can be used to drive the generator rotor. Using the principle of "electromagnetic induction", the generator will produce induced electromotive force. and a current can be generated through the closed charging loop.
2. Precautions for use:
① Frequently clean the scale and dust on the appearance of the generator and keep it clean and well ventilated.
② VFrequently check the tightening conditions of the generator-related fasteners and tighten the screws in time.
③The tension of the drive belt should be appropriate. If it is too loose, it will slip easily and result in insufficient power production; if it is too tight, it will easily damage the belt and generator bearings.
④When installing the battery, be careful not to install it incorrectly. Usually, install the positive wire first and not the ground wire, otherwise the diode will burn out easily.
⑤ When using an integrated circuit regulator, the ignition switch should be turned off immediately when the engine is not running.
⑥ It is never allowed to use the “scraping” method to test whether to produce electricity.
Baidu Encyclopedia - Car Generator
Baidu Encyclopedia - Generator
Condensation is easy to form, whichreduces the insulation resistance of the generator.
Heating of the wire increases, causing insulation cracks due to excessive thermal expansion and elongation. The temperature difference between the copper and iron of the rotor is too large, which may cause permanent deformation of the rotor coil.
The insulation becomes fragile and may not be able to withstand the mechanical torque generated by a sudden short circuit.
Generators are mechanical devices that convert other forms of energy into electrical energy. They are driven by water turbines, steam turbines, diesel engines or other electrical machines to convert water flow, air flow. , fuel combustion or atomic nuclei The energy produced by fission is converted into mechanical energy and transmitted to the generator, which is then converted into electrical energy.