China Neodymium And Ferrite Magnets Manufacturer & Supplier 
In the application of magnetic steel, you may notice that some embedded rotor magnetic steel slots feature small holes at their corners. What purpose do these serve? This article will introduce the design objectives and advantages of these corner holes in embedded rotor magnetic steel slots.
The most direct impact of the small holes designed at the corners of the magnetic steel slots is the improvement in magnetic saturation. Under certain specific operating conditions, the sharp corners of the magnetic steel slots may cause uneven magnetic field distribution, thereby affecting the magnetic saturation state of the steel. By drilling holes at the corners, the issue of magnetic field unevenness caused by sharp edges can be effectively mitigated, reducing magnetic saturation phenomena. Circular or curved holes enable a more uniform magnetic field, contributing to enhanced motor efficiency and stability.
In embedded rotors, the corners of the magnets are typically areas where stress concentration is particularly pronounced. Sharp corners can easily cause localized excessive stress, leading to fractures or damage in the material's vulnerable sections. By designing small holes at these corners, stress distribution can be effectively made more uniform, preventing stress concentration and enhancing the rotor's overall mechanical strength. This design not only extends the rotor's service life but also reduces mechanical failures caused by excessive stress.
V-shaped magnetic pole structure
Magnetic steel itself is typically made from brittle materials and is susceptible to damage during processing. Particularly in high-speed, high-temperature environments, excessive mechanical stress or temperature fluctuations can cause cracks or damage to the magnetic steel. The design of small holes at the edges effectively reduces the fragility of the peripheral areas, shielding the magnetic steel from direct impact by external pressures.
In addition to addressing magnetic and mechanical issues, the corner hole design can serve as an overflow port, facilitating the smooth discharge of excess adhesive.
The above outlines some benefits of corner cutouts in embedded rotor magnet slots. We hope this information proves helpful. Should your company require flat sheet magnets, curved magnets, or multi-pole ring magnets for motors, please feel free to contact us.
Common magnet types for motor rotors;