At what temperature can the OPPAIR screw air compressor motor work normally?
The insulation grade of the motor refers to the heat resistance grade of the insulating material used, which is divided into A, E, B, F, and H grades. The allowable temperature rise refers to the limit of the temperature of the motor compared with the ambient temperature.
Temperature rise refers to the value that the temperature of the stator winding is higher than the ambient temperature under the rated operating state of the motor (the ambient temperature is specified as 35°C or below 40°C, if the specific value is not marked on the nameplate, it is 40°C)
| Insulation temperature class | A | E | B | F | H |
| Maximum allowable 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, the insulating material is the weakest link. The insulating material is especially susceptible to high temperature and accelerated aging and damage. Different insulating materials have different heat resistance properties, and electrical equipment using different insulating materials can withstand The ability of high temperature is different. Therefore, general electrical equipment stipulates the maximum temperature for its work.
According to the ability of different insulating materials to withstand high temperature, 7 maximum allowable temperatures are specified for them, which are arranged in accordance with the temperature: Y, A, E, B, F, H and C. Their allowable operating temperatures are: Above 90, 105, 120, 130, 155, 180 and 180°C. Therefore, Class B insulation means that the heat-resistant temperature of the insulation used by the generator is 130°C. When the generator is working, the user should ensure that the generator insulation material does not exceed this temperature to ensure the normal operation of the generator.
Insulation materials with insulation class B are mainly made of mica, asbestos, and glass filaments glued or impregnated with organic glue.
OPPAIR screw air compressor
Q: At what temperature can the motor work normally? What is the maximum temperature the motor can withstand?
OPPAIR screw air compressor A: If the measured temperature of the motor cover exceeds the ambient temperature by more than 25 degrees, it indicates that the temperature rise of the motor has exceeded the normal range. Generally, the temperature rise of the motor should be below 20 degrees. Generally, the motor coil is made of enameled wire, and when the temperature of the enameled wire is higher than about 150 degrees, the paint film will fall off due to the high temperature, resulting in a short circuit of the coil. When the coil temperature is above 150 degrees, the temperature of the motor casing is about 100 degrees, so if it is based on its casing temperature, the maximum temperature the motor can withstand is 100 degrees.
Q: The temperature of the motor should be below 20 degrees Celsius, that is, the temperature of the motor end cover should exceed the ambient temperature by less than 20 degrees Celsius, but what is the reason why the motor heats up more than 20 degrees Celsius?
OPPAIR screw air compressor A: When the motor is running under load, there is power loss in the motor, which will eventually become heat energy, which will increase the temperature of the motor and exceed the ambient temperature. The value by which the motor temperature is higher than the ambient temperature is called the ramp-up. Once the temperature rises, the motor will dissipate heat to the surroundings; the higher the temperature, the faster the heat dissipation. When the heat emitted by the motor per unit time is equal to the heat dissipated, the temperature of the motor will no longer increase, but maintain a stable temperature, that is, in a state of balance between heat generation and heat dissipation.
Q: What is the allowable temperature rise in general click? Which part of the motor is most affected by the temperature rise of the motor? How is it defined?
OPPAIR screw air compressor A: When the motor is running under load, it is necessary to play its role as much as possible. The larger the load, the better the output power (if the mechanical strength is not considered). But the greater the output power, the greater the loss of power, the higher the temperature. We know that the weakest thing in the motor is the insulating material, such as enameled wire. There is a limit to the temperature resistance of insulating materials. Within this limit, the physical, chemical, mechanical, electrical and other properties of insulating materials are very stable, and their working life is generally about 20 years. Exceeding this limit, the life of the insulating material is shortened sharply, and even burns out. This temperature limit is called the allowable temperature of the insulating material. The allowable temperature of the insulating material is the allowable temperature of the motor; the life of the insulating material is generally the life of the motor.
Post time: Aug-22-2022
