Introduction To The Advantages And Disadvantages Of Sintered NdFeB Magnets For Permanent Magnet Motors And Splicing

Introduction to the advantages and disadvantages of sintered NdFeB magnets for permanent magnet motors and splicing

 

Our common sintered NdFeB magnets for permanent magnet motors are basically ring-shaped and tile-shaped, and tile-shaped magnets are made of multiple pieces spliced together. What are the advantages and disadvantages of the two shapes of magnets?

 

The two different shapes of magnets are caused by different production processes. The overall one is called a radiation ring, that is, its magnetic poles are radial. The manufacturing process is complicated (the magnetic field must be radial when the orientation is formed), and the manufacturing cost is high. But the motor The performance is stable, especially the dynamic balance, and it has no effect on the stop position of the servo motor after power failure (this must of course be designed as a ramp).

 

The other is spliced with several pieces of magnetic steel, and each piece of magnetic steel has a magnetic pole direction. This will cause poor dynamic balance when the motor is running due to the inconsistent quality of each piece of magnetic steel. This can be achieved by installing a magnetic steel on the rotor. After measuring the surface field strength, it is known that the best field strength curve should be a sine wave.

 

Of course, there is also a bonded NdFeB magnet, but the magnetic moment of the bonded and sintered magnets in the same volume is several times or even dozens of times different, which means that the power will be much smaller, and the power is not so strong. Bonding material can be selected.