A method for producing a hybrid magnet as well as hybrid magnet produced by the method and an electric machine comprising the hybrid magnet

摘要

A method of making a hybrid magnet (20), comprising the steps of: (a) providing a powder (10, 10 ') comprising particles (11, 11') of at least two magnetic materials (12, 12 '), the powder (10, 10') being a mixture of the at least two magnetic materials (12, 12 '). ) or in each case one of the at least two magnetic materials is present as separate powder, (b) coating the separated or mixed powder particles (11, 11 ') of the at least two magnetic materials (12, 12') with a diamagnetic or paramagnetic coating material (17, 17 '), (c) molding a mixture of the coated particles (13, 13 ') into a shaped body (19), (d) heat treating to sinter the coating material (17, 17 ') at a temperature lower than a temperature suitable for sintering the magnetic materials (12, 12'), converting the coating material (17, 17 ') into an amorphous matrix (21) a diamagnetic or paramagnetic material (22) embedding the particles of the at least two magnetic materials (12, 12 '), and (E) magnetizing the at least two magnetic materials (12, 12 ') in an external magnetic field, wherein the steps (c), (d) and (e) are carried out in any order in succession or in any combination at the same time.