Φ Abstract -Powder magnetic circuits find more and more application in modern electric machines. These magnetic circuits frequently comprise soft magnetic core and powder permanent magnets as a source of magnetic flux of excitation. It is connected with a lot of advantages of these kinds of materials. The main purpose of the work is to design a brushless DC motor with powder permanent magnet and powder soft magnetic core. It was assumed that the powder magnetic core will be prepared from iron powder bonded by resin and permanent magnet will be prepared from powder of Nd-Fe-B melt-spun ribbon. Investigation of technology of magnetic materials was done and presented. Measurements of properties of magnetic materials were considered in design and analysis of motor. During designing process the dimensions and operational parameters of designing motor were assumed. Permanent magnet DC brushless motor with nominal power 250 W and rotational speed 6000 rpm was designed.

Development of new magnetic materials enables development of electric machines. Nowadays a lot of universities, research centers and factories work on application of powder magnetic circuits in electromagnetic transducers. This type of magnetic circuits has a lot of advantages. The paper presents methods of tailoring physical properties of powder magnetic circuits and the influence of the type of magnetic circuits on the parameters of electric motors.

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