The speed of the permanent magnet speed control is unstable
Thread Content
The speed at 40% load is 1400 revolutions per minute, and it is very stable. Reduce the load to 30% of capacity; the speed fluctuates between 1100 and 1000, with one peak and one trough occurring every thirty minutes. What is the reason? Also, does the lower the load, the higher the temperature of the conductor disc? What principle?
What power? Is the motor 4-pole? Is the load a pump or a fan? Fluctuations in rotational speed may be due to an incorrect selection, as the key aspects of permanent magnet speed control have not been understood. If it’s convenient, could you let me know which brand’s product it is? Temperature and speed are related by a curve; a 4-pole motor experiences the greatest heat generation at around 1000 revolutions per minute.
Equipment Name, Equipment Tag Number, Pump Model: 250x200R2DM70. Rated Flow Rate: 328 m3/h; Actual Flow Rate: √. Rated Head: 219.6 m. Shaft Power: 180.8 kw. Motor Model: YB2-3554-4W. Rated Power: 250 kw. Rated Speed: 1485 r/min. Rated Current: 30.4 A. Rated Voltage: 6000 V. Actual Current: 24 A. Power Factor: 0.84. There is a curve relationship between temperature and speed; could you provide me with a curve graph of it? An approximate one will suffice. Our model is McPherson’s MAC-D
I’m not quite sure if the motor is of grade 4; it’s a centrifugal pump. Bottom loop pump
This shows the change in rotational speed after load adjustment
This is the speed control curve of the permanent magnet speed regulator; the peak at the bottom represents the heat generation curve. It can be seen that the highest level of heat generation occurs at around 1000 revolutions per minute. Regarding the issue of speed fluctuations, the 1st and 3rd curves in the legend overlap to some extent; in other words, there is more than one point of intersection. This indicates that when operating at this air gap, the load speed is unstable and subject to fluctuations. Could you please tell me the model of the permanent magnet speed regulator? It would be helpful to have a photo of the conductor disc for further assessment. It’s a product from my former employer; I’ve been away for almost 3 years now.
Seeing President Huang’s messages again gives me a very warm feeling:victory:
Yours is grade 4 YB2-3554-4W; the last 4 refers to that
Are the solutions you offer for water pump fans very different? Without replacing the permanent magnet equipment
This diagram is very professional; is it made by a foreigner?
This post was last edited by Qi Yanlong on 2020-4-6 at 14:05. It’s worth examining; could the article be shared?