But if this is the use of ferrite magnets, then this phenomenon does not occur unless there is some professional demagnetization tool, you can make it reach the demagnetization requirements, otherwise, it is difficult to achieve demagnetization, which is also it's a great advantage, the other when it is used, has its own economic advantage.
This is the most user psychology, because the use of a magnet, if it is used at the time, high prices, even though its performance is good, it will not be a lot of users to choose, because any user want to make their production out of the motor has a very low cost.