How to measure the winding temperature in the five motor temperature rise test of the geared motor?
The motor temperature rise test is a very important test in the motor type test. The temperature rise of the motor determines the service life of the motor insulation. The method of measuring the winding temperature in the motor temperature rise test generally has five methods of measuring the KA167 reducer by the thermometer method, the thermocouple method, the electric resistance method, the embedded thermometer method and the double bridge charging temperature measurement method.
First, the thermometer method measures the motor winding temperature
Thermometers include expansion thermometers (such as mercury, alcohol thermometers), semiconductor thermometers, and non-embedded thermal or resistance thermometers. The thermometer method is the easiest to measure the temperature of the motor directly. However, the thermometer can only touch the surface of each part of the gearbox motor, and if the measurement is not correct, the environment has a great influence on the measurement results.
Second, the thermocouple method measures the motor winding temperature
The thermocouple method is to attach a thermocouple to the surface of the equipment component, and measure the temperature of the surface of the equipment component by a temperature measuring instrument to calculate the temperature rise. The factors affecting the temperature rise by thermocouple method include thermocouple, temperature measuring instrument, environmental conditions of the adhesive and test, and the operating level of the test engineer.
When the bevel gear reducer uses a thermocouple to measure the temperature of the winding, it should be considered. Since the thermocouple reading lags behind the temperature change of the winding, the temperature of the thermocouple may continue to rise after the motor is de-energized, so the temperature of the motor winding should be recorded. The highest temperature, which may not be reached after a power failure.
Third, the resistance method measures the motor winding temperature
The resistance method measures the motor winding temperature as measured by the principle that the conductor resistance increases with increasing temperature.
Fourth, the embedded thermometer method to measure the motor temperature
The high-power K167 reducer motor generally pre-embeds the thermometer at the temperature measurement point. The temperature-detecting components generally have thermocouples and resistance thermometers. The heated end of the thermometer is buried in the depth of the tank, and the leading end of the thermometer is led to the outside and connected to the measuring instrument to read the temperature.
Five, double bridge charged temperature measurement method to measure motor temperature
The double-bridge charging temperature measurement method measures the motor temperature by superimposing a weak DC current on the load current without interrupting the alternating load current to measure the change of the winding DC resistance with temperature to determine the temperature of the AC winding. Rise.
