The hybrid magnet was made by combining electromagnet with permanent magnet(PM).

Starting from the two operational states of permanent magnet, this article explains that the working point of permanent magnet in the permanent magnet actuator is sited on the reversional curve, and the demagnetized curve of NFeB permanent magnet is approximately in a straight line,and its reversional curve coincides with the demagnetized curve, moreover,its flux density has repeatability.

In this paper, an IBEM(Indirect Boundary Element Method) is presented for calculating permanent magnet field, and the formula of calculating magnetic field intensity is deduced.

Grinding the facet of parts with permanent magnet device;

Research on application of permanent magnet loop in magnetic force grinding;

In order to achieve the objective of the dynamic steady suspension of a train model under the condi- tion of excluding force both from permanent magnet and electromagnetism,the authors put forward a train model suspended by permanent magnet and oriented by electromagnetism.