About the concept of consumed life of electrical machine windings and its application

Abstract

In order to economize on electrical energy and materials a higher Iond of electrical motors is necessary. In this way it is possible that the motors operate above their rated power. Consequently, the rated temperature of the winding is exceeded and, therefore, its lifetime is shortened. For the description of the winding aging process the consumed life is an appropriate quantity. The meaning of this quantity is explained and its application is demonstrated.

Reliability-Oriented Design of Inverter-Fed Low-Voltage Electrical Machines: Potential Solutions

“…Due to the limited wear-out data of electrical machines, these parameters are commonly derived from the accelerated aging test. The adoption of Dakin's equation can be seen in the thermal qualification standards [30,31] and published papers [45,46,49,[74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93]. However, most of the papers simply apply Dakin's equation by assuming the thermal stress as the dominated aging factor without any preconditions (e.g., PD-free), which would lead to the inaccuracy of prediction.…”

The use of slightly asymmetrical windings for rotating electrical machines

“…In this context, the aim of this paper is to demonstrate with several examples that the use of slightly asymmetrical windings can be a reasonable choice and, in certain cases, a favorable option during the design stage of electrical machines like IPMSMs, which require proper design, modeling, and control accuracy …”

“…9,10 In this context, the aim of this paper is to demonstrate with several examples that the use of slightly asymmetrical windings can be a reasonable choice and, in certain cases, a favorable option during the design stage of electrical machines like IPMSMs, which require proper design, modeling, and control accuracy. [11][12][13][14][15][16][17][18][19] More in detail, by considering an IPMSM (named IPMSM-A) equipped with a 3-phase symmetrical winding as a reference structure, the corresponding star of slots is determined by adopting Tingley's scheme. Then, this motor geometry is analyzed by using a finite element method (FEM) approach, to determine both the generated cogging torque and the torque/load angle characteristics.…”

Investigation of winding MMF harmonic reduction methods in IPM machines equipped with FSCWs

“…To be able to reduce the MMF harmonics, some other studies have been proposed different methods such as adopting asymmetrical windings, applying a new vector control schema observing the back electromotive force (back‐EMF) waveform, and adopting axial flux modular structure with straight slots and concentrated windings . The importance and effect of MMF harmonics on the performance characteristics of various machines form induction machine to reluctance machine has also been emphasized …”

“…22 The importance and effect of MMF harmonics on the performance characteristics of various machines form induction machine to reluctance machine has also been emphasized. 23,24 In this study, influence of FSCWs on the electromagnetic and thermal performance of an IPM machine, designed by using the same specifications as Toyota Prius 2010 IPM machine, has been investigated. It has been validated that the significantly high level of MMF harmonics causes an increase in the rotor losses.…”