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Anonymous users2024-02-07First of all, let's introduce the insulation grade of the motor.
refers to the insulating material used.
The heat resistance grade is divided into A, E, B, F, H grades. The allowable temperature rise refers to the limit at which the temperature of the motor rises compared to the ambient temperature.
The temperature class of insulation is Class A, Class E, Class B, Class F, Class H.
Maximum permissible temperature ( ) 105 120 130 155 180
Winding temperature rise limit (k) 60 75 80 100 125
Performance reference temperature ( ) 80 95 100 120 145
In electrical equipment such as generators, insulation is the weakest link. Insulation materials are particularly susceptible to high temperatures, which can accelerate aging and damage. Different insulating materials have different heat resistance, and electrical equipment with different insulating materials has different ability to withstand high temperatures.
Therefore, the maximum temperature at which electrical equipment works is specified in general.
According to the ability of different insulating materials to withstand high temperatures, 7 allowable maximum temperatures are specified, which are arranged according to the temperature magnitude: y, a, e, b, f, h and c. Their permissible operating temperatures are and above 180 °C.
Therefore, Class B insulation indicates that the insulation heat resistance temperature used in this generator is 130. When the generator is working, the user should ensure that the generator insulation material does not exceed the temperature to ensure the normal operation of the generator.
Insulation materials with grade B insulation, mainly made of mica and asbestos.
Glass filaments are made by organic glue glue or impregnation.
According to the question you said, your motor insulation is 155 degrees in grade F, and the temperature rise in grade B is 80 degrees, then the working environment temperature of your motor should be less than 155-80=75 degrees.
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Anonymous users2024-02-06It refers to the insulation of the electric motor and the heat resistance level of the insulating material used.
The insulation level of the motor is mainly set to prevent the thermal energy generated by the current from burning out the insulation layer, the most common is Class B insulation and Class F insulation. Class B insulating materials are commonly made of mica, asbestos, and glass filaments glued together or impregnated with organic glue.
It is the temperature that is higher than the ambient temperature generated by the heat generated by the transformer during operation. Its value is equal to the upper oil temperature of the transformer minus the ambient temperature. kunlaoshi。
For the coil of dry-type transformer, when the A-class insulating material is used, the maximum temperature rise should be less than 60K when the ultimate working temperature is 105; When the E-class insulating material is used, the maximum temperature rise should be less than 75K when the ultimate working temperature is 120K; When the B-class insulating material is used, the maximum temperature rise should be less than 80K when the ultimate working temperature is 130K.
When the F-class insulating material is used, the maximum temperature rise should be less than 100K when the ultimate working temperature is 155; When H-class insulating material is used, the maximum temperature rise should be less than 125K when the ultimate working temperature is 180. When C-grade insulating materials are used, the maximum temperature rise should be less than 150K when the ultimate working temperature is 220K.
Under no circumstances will the core, metal parts and the materials adjacent to it be subject to temperatures that would damage the core itself, other parts or materials adjacent to it. As well as the deterioration of the lubricating medium, the temperature of the centrifugal pump bearing with hot water and hot oil is even higher. The temperature of the conventional centrifugal pump bearing is normal at 75, mainly because the temperature is too high and will cause the deformation of the bearing.
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Anonymous users2024-02-05Maximum allowable temperature of class B: 130 °C;
Maximum allowable temperature of class F: 155;
When the motor adopts Class B insulation, the temperature rise limit (resistance method) of the stator winding should not exceed 80K;
When the motor adopts F-class insulation, the temperature rise limit of the stator winding should not exceed 100K;
The so-called ultimate operating temperature of the insulating material refers to the temperature of the hottest spot in the winding insulation during operation of the motor during the design life expectancy. According to experience, the life of A-grade materials in 105 and B-grade materials in 130 can reach 10 years, but in the actual situation, the ambient temperature and temperature rise will not reach the design value for a long time, so the general life is 15 20 years.
If the operating temperature exceeds the limit working temperature of the material for a long time, the aging of the insulation will be aggravated and the service life will be greatly shortened. Therefore, in the operation of the motor, temperature is one of the main factors of life.
Insulating materials are divided into Y, A, E, B, F, H, and C according to their heat resistance.
Insulation grade table of electric motors:
Motor temperature rise description: the temperature rise of a certain part of the motor is the difference between the temperature of the part and the temperature of the cooling medium, and the unit is k. The temperature rise of the motor includes the temperature rise of the stator and rotor windings, and the temperature rise of the stator and rotor cores; The temperature rise of the collector ring and the allowable temperature of the bearing (explained earlier).
The temperature rise of the winding of the B-class motor is limited to 80K; The F-class motor is also 80K according to the B-class assessment; According to the F-level assessment is 105K, according to the corresponding standard, the B-class insulating material can withstand the working temperature for a long time is 130, the F-level can withstand 155 for a long time, according to the actual operation of the maximum ring temperature of the motor 40, the allowable working temperature of the motor is:
120 at grade B (ambient temperature 40 + temperature rise 80) 130
145 at class F (ambient temperature 40 + temperature rise hood 105) 155
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Anonymous users2024-02-04The insulation grade of the motor refers to the heat resistance level of the insulating material used, which is divided into A, E, B, F, H grades.
The temperature rating of the insulation.
Class A and Class E. Class B and Class F.
The maximum allowable temperature of class h ( ).
180 winding temperature rise limit (k).
125 Performance reference temperature ( ).
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Anonymous users2024-02-03The insulation grade of an electric motor refers to the heat resistance level of the insulating material used in it. It is divided into grades A, E, B, F, and H. The allowable temperature rise refers to the Class B insulation (allowable working temperature of 130 degrees) and Class F insulation (allowable working temperature of 155 degrees) of the electric motor
The limit to the increase in the temperature of the motor compared to the ambient temperature.
The temperature rating of the insulation.
Class A and Class E. Class B and Class F.
The maximum allowable temperature of class h ( ).
180 winding temperature rise limit (k).
125 Performance reference temperature ( ).
145 According to the ability of different insulating materials to withstand high temperatures, 7 allowable maximum temperatures are specified, which are arranged according to the temperature size: Y class (allowable working temperature 90 degrees), A class (allowable working temperature 105 degrees), E class (allowable working temperature 120 degrees), B class (allowable working temperature 130 degrees), F class (allowable working temperature 155 degrees), H class (allowable working temperature 180 degrees), and C class (allowable working temperature greater than 180 degrees). There is a relationship between the insulation level and the temperature.
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Anonymous users2024-02-02Electric motorsof insulation,Boding insulating plastics,According to the heat resistance, it is divided into Y, A, E, B, F, H, and C.
Each grade corresponds to the achievable temperature resistance, e.g. Class F up to 155°C, while Class A also has its corresponding temperature resistance.
If the corresponding operating temperature is exceeded, it is easy to lose the insulation performance.
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Anonymous users2024-02-01Thermal classification F and thermal classification 155f are the same, but the writing is different, and the F grade requires 155 to work properly.
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Anonymous users2024-01-31Abstract:The main purpose of setting the insulation grade of the motor is to prevent the heat energy generated by the current, and when the insulation layer is made of F-class insulating material, the maximum temperature rise should be less than 100K when the ultimate working temperature is 155
What does it mean that the motor insulation grade F and temperature rise are rated B?
The main purpose of setting the insulation grade of the motor is to prevent the heat energy generated by the current, and when the insulation layer is made of F-class insulation material, its ultimate working temperature is 155, and the maximum temperature rise should be less than 100K
How to understand the temperature rise of F and B with F-grade materials?
F-grade materials can only do F-level temperature rise, right?
So how to do the B-level temperature rise?
The grade of the insulating material of the motor is class F, but the heat resistance of the insulating material is class B, which refers to the insulation grade of the motor and the heat resistance grade of the insulating material used in it.
Thank you, you're welcome, give a thumbs up if it's convenient, thank you.
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Anonymous users2024-01-30F-class insulated motor, the maximum temperature of the limit is 155, the motor in the case of normal operation, due to the inability to measure the temperature of the coil, the temperature of the casing is not allowed to exceed 145, and the maximum temperature of the motor casing can not exceed 140.
The insulation grade of the motor refers to the heat resistance level of the insulating material used, which is divided into A, E, B, F, H grades. The allowable temperature rise is the limit at which the temperature of the electric motor rises compared to the temperature of the surrounding environment. The hand-shielded grade of the motor is closely related to the insulation material used, and the better the insulation material, the higher the insulation grade.
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