Motor life is closely related to its operating temperature
The aging of insulating materials is affected by both time and temperature factors, so the aging of insulating materials is a chemical phenomenon that involves slow oxidation and sudden curing, and results in damage to mechanical durability and dielectric strength. In many cases, considering the aging rate, the life of the insulating material can be expressed as the following exponential function:
Lifetime = AeB/T.........(1)
In equation (1), A and B are constants; T is the absolute operating temperature. According to past experience, if the temperature rises by 8°C-14°C, the failure time of the organic insulation material will be shortened by half, so the approximate life-temperature relationship can be obtained.
Insulation life test
Generally try to simulate working conditions. These conditions usually include: (1) Thermal shock caused by heating to the test temperature. (2) Continuous heating at this temperature. (3) Thermal shock caused by cooling to room temperature or lower temperature. (4) Vibration and mechanical stress that may be encountered in actual work. (5) Exposure to moisture. (6) The dielectric test determines the insulation state.
The motor rating is determined by the motor manufacturer's specifications for the total amount of power and mechanical output, as well as their duration and sequence. Includes the following typical situations:
(1) The amount of continuous work is determined.
(2) Short-term work quotas.
(3) the amount of work cycle.
(4) The amount of work for non-discrete constant loads.
Affecting motor rating factors
(1) Motor heat and heat dissipation conditions.
(2) Motor structure.
(3) Use environment.
(4) Cooling method.
(5) Work system.
(6) Insulation class.