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The paper presents the analysis of a 3-D numerical model developed for a new claw pole synchronous machine with hybrid and contactless excitation. The main field is produced by NdFeB permanent magnets placed in the rotor, and by two fixed field coils mounted inside machine shields and fed from a controlled DC current supply. The complex structure of the claw-pole magnetic circuit required usage of...
The paper presents a new double layer three phase 4 to 6 pole-changing winding, with 48 slots and 6 terminals. In order to obtain a higher fundamental winding factor when winding is 6-pole connected, a degree of asymmetry is accepted for the winding when 4-pole connected. The new winding is compared with a well known two-layer winding presented in literature. An experimental motor equipped with the...
The paper presents a new possibility of obtaining lower space harmonic content for the fractional-slot, tooth-concentrated windings by interspersing the phase windings. By using multiple layer windings it is possible to reduce or even to cancel some space sub-harmonics having as final result lower eddy current losses induced by the armature reaction in the iron structure of the rotor. The general...
In the last decade, the use of PWM voltage-source inverters to control three-phase squirrel-cage induction motors increased significantly. Consequently, high-frequency current activity in the bearings of inverter-fed motors and/or of devices mechanically coupled to their shaft is presently a common problem, ultimately shortening the bearings lifetime. In fact, bearing failures occurrence in inverter-fed...
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