What is the core loss related to?

What is the core loss related to?

Core loss is also called iron loss. It, along with copper losrs:s and windage loss, constitutes the three main aspects of the motor's energy loss. So, what is the core generally related to? Generally, it is related to the following facto

1. Material:

Generally, the core is made by laminating cold - rolled silicon steel sheets. Iron loss is one of the most important indicators of the performance of silicon steel sheets, and the grade of silicon steel sheets is named according to its iron loss value. Taking Baosteel's non - oriented silicon steel sheets as an example; B35A250 represents that its core loss value is 2.5W/KG under the test condition of 1.5T@50Hz. The lower the grade value, the lower the loss value, which means the material performance is more superior and its unit price is higher. The common core loss values of silicon steel sheets are as follows:

2. Lamination process:

Generally, the lamination process of the core can be divided into self - locking rivet points, welding, gluing, and clamping strips. The core loss values are different for different processes. In principle, the eddy current loss caused by inter - layer conduction in the core laminated by gluing has been reduced to zero. Therefore, high - end core designs all use gluing lamination. Baist has been focusing on glued cores for many years and has mature production experience of glued cores. At the same time, it is one of the few domestic manufacturers capable of mass - producing glued cores.

3. Motor design:

The motor design will affect the core loss, especially the appropriate number of motor teeth and the matching number of magnets. At the same time, the appropriate material selection and winding parameter design will also affect the overall motor loss.

4. Motor speed:

According to the motor design theory, the frequency of the motor is speed * number of pole pairs/60. The eddy current loss of the core loss is proportional to the square of the frequency. Therefore, the higher the motor speed, the greater the core loss of the silicon steel sheets with the same thickness or the same grade. This is also the reason why high - speed motors on the market all use ultra - thin silicon steel sheets, such as 0.1mm super silicon steel. The following are the typical loss values of silicon steel sheets with common thicknesses at different frequencies, for reference only.