How often does the motor work normally?

Update:28 Apr 2018
Summary:

★ How high can the motor withstand high temperatures? A […]

★ How high can the motor withstand high temperatures?
Answer: If the temperature of the motor cover is measured to exceed 25 degrees above the ambient temperature, 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. The general motor coil is wound by enameled wire

Made, and the enameled wire in the temperature above 150 degrees when the paint film will be off because of excessive temperature, causing the coil short circuit. 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 case temperature, the maximum temperature the motor can withstand is 100 degrees.

★ The temperature of the motor should be less than 20 degrees Celsius, that is, the temperature of the motor cover exceeds the ambient temperature should be less than 20 degrees Celsius, but what is the reason for the motor heating over 20 degrees Celsius?
A: The direct cause of motor heating is due to large currents. It may be caused by a short circuit or open circuit of the coil, demagnetization of the magnetic steel, or a low efficiency of the motor. Normally, the motor is operated for a long time with a large current.

★ What causes the motor to heat up? What kind of process is this?
Answer: When the motor is running, there is power loss in the motor and eventually it will become thermal energy. This will increase the temperature of the motor and exceed the ambient temperature. The motor temperature higher than the ambient temperature is called temperature rise. once

With warming, the motor must dissipate heat around it; the higher the temperature, the faster the heat dissipation. When the amount of heat emitted by the motor per unit of time equals the amount of heat that is dissipated, the temperature of the motor no longer increases, but maintains a constant temperature

, which is in a state of heat and heat balance.

★What is the allowable temperature rise for normal clicks? Which part of the motor is affected by the temperature rise of the motor? How is it defined?
Answer: When the motor load is running, starting from its role as much as possible, the larger the output power, the better is the load (if not considering the mechanical strength). However, the greater the output power, the greater the power loss and the higher the temperature. I

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, and electrical properties of insulating materials are very high.

Stability, its working life is generally about 20 years. Exceeding this limit, the life of the insulation material is drastically shortened and even burned. This temperature limit is called the allowable temperature of the insulating material. Permissible temperature of insulating material

Degree is the allowable temperature of the motor; the life of the insulating material is generally the life of the motor.