Torque ripple reduction in permanent magnet synchronous machines with concentrated windings and pre-wound coils

Abstract

Ideally, improvements of the manufacturing process do not cause deteriorations of the product characteristics. Pre-wound coils for electrical machines with concentrated windings are such an improvement. The easiest way to enable the assembling of pre-wound coils is simply the absence of pole shoes. This paper discusses the absence of pole shoes based on a sample machine. The focus lies on changes of cogging, avg. nominal and peak torque and the occurring torque ripple. Furthermore, different technologies as a variation of the tooth thickness, skewing, magnetic slot wedges and plug-in connections are investigated to compensate deteriorations of torque behavior. In addition, the effects of these technologies on the manufacturing process of a stator are discussed.

Effect of Stator Segmentation and Manufacturing Degradation on the Performance of IPM Machines, Using iCARe® Electrical Steels

“…For example, for the topology shown in Fig. 1 (c), high stresses and even plastic deformation are expected when the segments are inserted in the teeth [1]. In contrast, stator segments from the topology shown in Fig.…”

“…With regards to the production of the stator core, recent publications have demonstrated the potential advantages of a segmented approach, where the stator core is assembled from a number of sub-stacks, as demonstrated in Figs 1 (a) to (d) [1][2][3][4]. The topology from Fig.…”

Impact of Stator Segmentation on the Performance of Aerospace Propulsion Machines

“…Stator segmentation is identified as a potential method to reduce the wastage of lamination [11]. The impact of stator segmentation on cogging torque and torque ripple are analyzed in [12] and [13] respectively. The presence of gaps between stator segments is found to increase the magnitude of cogging torque [12].…”

Improving the Torque Characteristics of Interior Pm Synchronous Motor Using an Asymmetric on-Off Method on the Rotor Surface

“…Design optimization is then performed to reduce the noise and vibration. Similar efforts have been made on shape optimization of the rotor, stator and/or permanent magnets to improve the motor characteristics in [9][10][11][12][13][14][15][16][17]. In [18][19][20][21][22] some efforts are made to study the local forces in surface mounted permanent magnet motor, switched reluctance motor and a simple electromagnetic device.…”