Materials for Wind Permanent Magnet Generators

Magnets
Grade: The grade of a magnet refers to the maximum energy product of the material that composes the magnet. In simple terms it is to tell how strong the magnet is. The higher the grade the stronger the magnet is. Unit of energy product is Gauss. Sintered Nd-Fe-B will remain indefinitely; they experience a minute reduction in flux density over time. As long as their physical properties remain intact, they can work well with same efficiency for 100 years.
Magnets will start losing their properties if they are heated above their rate temperatures which is why one cannot overload a permanent magnet generator.

The surfaces of the magnets are coated to protect them from external environment and this does not affect its magnetic properties.This increases the air gap between the magnets and the device it is held to. The coatings are very thin and hence the air gap change is negligent.

Precision Manufacturing
Bearing Housing: These are very important for safe operation and durability of industrial bearings. These are used to mount the bearings safely.
There are many types of bearing housings available. The possibility of relubrication should be kept in mind while choosing the type. Housings which require relubrication are called relube type, and others are called maintenance-free bearing housing. Other types can be split type and unsplit type.