Do electric motors motors also have plateau reaction?
When it comes to plateau reaction, we are all familiar with it. When we go to a higher altitude, many people will have plateau reaction, and electric motors are no exception. Have you ever heard of plateau reaction of electric motors? What measures should we take to adjust the plateau reaction of the motor?
First, the main characteristics of plateau area are:
1, air pressure or air density is small.
2, the air temperature is lower, and the temperature change is larger.
3, the air relative humidity is smaller.
4, higher solar radiation illumination.
The oxygen content of the air at 5000m is only 53% of the oxygen content of the air at sea level.
What are the symptoms of ordinary motors running in plateau environment?
Plateau environment, high altitude, low air pressure, lack of oxygen, high temperature, temperature difference, wind and sand, for the motor ventilation and heat dissipation conditions, insulation and protection are extremely severe test. If the ordinary motor is directly applied to the plateau environment, may be due to the deterioration of operating conditions of heat burned or failure frequently.
Second, what is the impact of altitude on the motor?
Altitude on the motor temperature rise, motor corona (high-voltage motors) and DC motor commutation have an adverse effect.
The following three aspects should be noted:
(1) The higher the altitude, the greater the motor temperature rise, the lower the output power. However, when the temperature decreases with the increase in altitude enough to compensate for the effect of altitude on temperature rise, the rated output power of the motor can be unchanged;.
(2) High-voltage motors should be protected against corona when used at high altitude.
(3) altitude is unfavorable to the DC motor commutation, pay attention to the selection of carbon brush material.
Third, plateau motor
Plateau motor: refers to the use of the motor at an altitude higher than 1000 meters. Refers to the national industry standard: JB/T7573-94 plateau environmental conditions under the general technical conditions of electrical products and plateau motor is divided into many levels: they are not more than 2000 meters, 3000 meters, 4000 meters, 5000 meters.
Plateau motor running at high altitude, due to low air pressure, poor heat dissipation conditions, and loss will increase, operating efficiency is reduced. Therefore, the rated electromagnetic load and heat dissipation design of motors operating at different altitudes are different. If the motor is not of high altitude specification, it can be operated with reduced load appropriately. Otherwise, the life and performance of the motor will be affected, and even burned in a short time.
Fourth, the plateau on the plateau on the motor operation of the adverse effects of what measures should be taken?
What measures should be taken for the adverse effects of motor operation?
Plateau motor running at high altitude, due to low air pressure, poor heat dissipation conditions, and loss will increase, the operating efficiency is reduced. Therefore, the rated electromagnetic load and heat dissipation design of motors operating at different altitudes are different for the same motor. If the motor is not of high altitude specification, it can be operated with reduced load appropriately. Otherwise, the life and performance of the motor will be affected, or even burned in a short time.
1, the cooling effect of the air medium is reduced, the heat dissipation capacity decreases, the temperature rise increases, every 1000M, the temperature rise to increase 3-10%, so to correct the temperature rise limit value.
2, the higher the altitude, the greater the motor temperature rise, the lower the output power. But when the temperature with the increase in altitude and reduce enough to compensate for the impact of altitude on the temperature rise, the motor's rated output power can be unchanged;
3, corona starting voltage reduction, high voltage motors used in plateau to take anti-corona measures;
4, altitude on the DC motor commutation unfavorable, pay attention to the selection of carbon brush materials.
5, caused by the reduction of insulation strength: every 1000 meters, insulation strength to reduce 8-15%.
6, the breakdown voltage of the electrical gap decreases, so according to the size of the altitude of the corresponding increase in the electrical gap.
