What are the precautions for using an eddy current dynamometer?

　　What are the precautions for using an eddy current dynamometer? We have previously provided a brief introduction to this question, but we found that many customers still do not understand. Today, I would like to take this opportunity to explain it to everyone. I hope it can be of good help to the relevant personnel.

　　The eddy current dynamometer has characteristics such as simple structure, convenient operation, high testing accuracy, and long service life. Its different torque and speed characteristics can ensure the stability of the load point across the entire power range, and it can quickly adjust the load and unload, making it very suitable for program control and remote operation. To avoid problems during use, it is recommended that you pay attention to the main body of the dynamometer during operation. The main body requires regular maintenance. Key checks include water leakage, water pressure, overheating, abnormal vibration, and noise. At this time, it is recommended to visually check for water leakage in the main body; use a pressure gauge to check the inlet water pressure; use a thermometer or touch the temperature of the main body, bearings, and cooling water; observe or listen for sources of abnormal vibration and noise. Additionally, the eddy current dynamometer must be protected every three months, during which time you can check the insulation resistance of the excitation coil. A megohmmeter can be used to test the insulation resistance between the end of the cable and the frame. Every three months, concentricity must also be checked. The vibration meter of the eddy current dynamometer can be used to measure the vibration of each part; concentricity can be checked with a dial gauge.

　　In addition, when using the eddy current dynamometer, attention must also be paid to its water pressure controller. It is recommended that users check this every three months, focusing on whether the water pressure switch is functioning. The method is to switch the inlet valve and measure the pressure value; check whether the measurement switch contacts have output. Then there is the external cable. At this time, the key points are appearance and connections. Check if the cable insulation is damaged; whether the joints are loose or rusty; whether there is dust on the terminal part. Cooling water is also very important. These areas need maintenance every six months, with the maintenance point being the flow of cooling water. The flow can be measured with a flow meter. Of course, before starting the eddy current dynamometer, the excitation current of the dynamometer should be zero, allowing the engine to start under near-zero load conditions. Then the inlet valve can be opened, and the cooling water enters the cooling channel of the dynamometer through the flow switch, draining back to the water tank through the base drain pipe, or directly discharged through the discharge pipe. Start the eddy current dynamometer to drive the dynamometer spindle to rotate at the same speed, and check again whether the lubricating oil and cooling water are unobstructed. If the speed exceeds 3500 RPM, close attention should be paid to checking the temperature rise of the spindle bearings. If the temperature at the bearing is too high, the oil supply should be appropriately increased.

　　The above article introduces the precautions for using the eddy current dynamometer. If you are not familiar with these, hurry up and learn about them. I hope it can help more friends. In the next issue, we will bring more exciting content. If there are any unclear points, you can always consult us.