Temperature rise test method of permanent magnet motor

In the previous article, we have learned about the fault detection method of permanent magnet motor. It can be seen that some faults may occur during the operation of this motor. At this time, we should listen to the sound , and then carefully find the fault point. We can also use Use your sense of smell and touch to determine the source of the problem. Today, the editor will analyze in detail the temperature rise test method of permanent magnet motors!

When using a permanent magnet motor, temperature rise may occur. We know that if its temperature is too high, it can easily cause damage to the machine. This requires us to control the temperature. To control it, we need to test the temperature rise. For its testing method, let’s learn about it together:

1. Determination of working temperature

The temperature rise of the permanent magnet motor under test is usually measured at the same time as its load-bearing capacity and transmission efficiency, or it can be measured separately. When the motor under test meets the regulations, read its temperature rise at rated speed and rated input power. Operating temperature.

2. Measurement of ambient temperature

Place a thermometer 1.5m away from the surface of the permanent magnet motor being measured. The height of the thermometer measuring point from the ground is the same height as the axis line of the reducer. The placement of the thermometer should not be affected by external radiant heat and airflow. The reading of the ambient temperature value The reading of the operating temperature value should be carried out at the same time.

The application of permanent magnet motor is very wide, and its operation is also very simple. If you want to use and maintain it better, its temperature should be controlled well. This requirement is very important. Everyone needs to understand it carefully. I hope that the above knowledge It can bring operational convenience to everyone.

Whether the voltage is stable directly affects the use of the equipment, especially the permanent magnet motor. So is there any way to keep its voltage stable? This article conducts specific analysis and discussion on this, and finally summarizes the following methods.

1. Use the automatic excitation adjustment device of the generator because it has good excitation characteristics and has various adjustment methods such as constant reactive power and constant power factor, which can effectively improve the transient response capability and system stability.

2. Connect a suitable resistor in parallel to both ends of the permanent magnet motor resistance. According to the resistance change of the resistive load after heating, the nonlinear resistance characteristics are obtained, so that the field resistance line and the starting section of the excitation characteristics have a larger intersection angle, and we get An obvious intersection point with the no-load characteristic curve, so that the permanent magnet motor will have a stable operating point at a lower voltage.

3. Benign magnetic conductive materials can be placed under the magnetic pole shoes to reduce the excitation magnetic field gap, so that the output saturation characteristics can be achieved under small excitation current conditions, thus ensuring the stability of the output voltage.

In fact, proper operation plays a very important role in the voltage stability of the DC deceleration motor, so before using it, we should check it and confirm that there is no abnormality before using it.