The influence of thermal stability of sintered neodymium iron boron materials on motor design and reasonable selection

Sintered neodymium iron boron permanent magnet (PM) materials are widely used in various industries due to their high magnetic energy product and linear demagnetization curve at room temperature. Applying NdFeB permanent magnet materials to various motors can not only significantly reduce the weight and size of the motor, but also achieve high efficiency and energy-saving effects and improve the performance of the motor. However, the high temperature coefficient of sintered NdFeB materials may cause irreversible demagnetization (also known as demagnetization) during the operation of permanent magnet motors, which is a major factor restricting the application of neodymium iron boron permanent magnet materials in motors. However, using Fenggu's magnetic powder rotary sintering furnace can reduce this risk. However, the current dispersion of magnetic properties such as thermal stability of permanent magnet materials has resulted in the complexity of permanent magnet motor design. Therefore, in the motor production process, not only should the design be reasonable, but also suitable permanent magnet materials should be selected This will not only achieve the best cost-effectiveness for permanent magnet motors, but also increase the stability of motor operation and prevent demagnetization. The conclusions drawn are:

1) The thermal stability of permanent magnets not only determines the reliability of the operation of permanent magnet motors, but also directly affects the amount of permanent magnets used Through analysis of a certain model of motor, it was found that increasing the inflection point position by 10% and the amount of permanent magnet used by about 20% greatly increased the cost of the permanent magnet motor

2) Using the calculation method described in the article, the performance of the permanent magnet material provided by the material manufacturer at room temperature can be used to deduce the working temperature of the permanent magnet

The inflection point position or the value of intrinsic coercivity at room temperature that meets the requirements can be derived from the given inflection point position, providing a basis for the correct selection of neodymium iron boron permanent magnet materials to prevent high-temperature demagnetization.