Nanyang explosion-proof motor: How is the thermal protection function of explosion-proof motors achieved?

2024-01-11 17:45:44

Explosion proof motor is a type of motor used for working in hazardous environments, such as industrial locations in flammable gases or vapors. Due to the potential risk of explosion in these environments, explosion-proof motors must have thermal protection function to ensure their safe operation. Below, Nanyang explosion-proof motors will explain to you:

The thermal protection function of explosion-proof motors is mainly achieved through temperature sensors and thermal protectors. The temperature sensor is mainly used to monitor the temperature of the motor. Once the temperature exceeds the safe range, the thermal protector will automatically cut off the power to prevent the motor from overheating and causing fire or explosion.

The most commonly used temperature sensor in explosion-proof motors is a thermistor. The resistance value of a thermistor varies with temperature, so the temperature of the motor can be determined by measuring the resistance value. Thermistors are usually installed at the winding or bearing of the motor to ensure accurate monitoring of the motor's temperature.

A thermal protector is a device used to protect a motor from overheating damage. It usually consists of a bimetallic sheet, a resistance wire, and a cut-off switch. When the temperature of the motor exceeds the set safe temperature, the thermistor will cause current to flow through the resistance wire, causing it to heat up. When the resistance wire reaches a certain temperature, the bimetallic sheet will bend due to thermal expansion and contraction, triggering a cut-off switch to cut off the power supply.

In addition to thermistors and thermal protectors, thermal switches can also be used to achieve thermal protection functions. A thermal switch typically consists of a thermal element and a cut-off switch. When the temperature of the motor exceeds the set safe temperature, the thermistor will change its resistance value, trigger the cut-off switch, and cut off the power supply.

In order to ensure the normal operation of the thermal protection function of explosion-proof motors, it is necessary to conduct regular inspections and maintenance. Regular testing can be carried out by measuring the resistance value of the thermistor and checking the working status of the thermal protector or thermistor switch. If the thermal protection device is found to be ineffective or has other faults, it should be replaced or repaired in a timely manner.

Nanyang Explosion proof Motor tells you that the thermal protection function of the explosion-proof motor is achieved through temperature sensors and thermal protectors. The temperature sensor is mainly used to monitor the temperature of the motor, while the thermal protector is used to cut off the power supply when the temperature exceeds the safe range to prevent the motor from overheating and causing fire or explosion. The implementation of thermal protection function requires regular testing and maintenance to ensure its reliability and safety.