Shielded axially slitted solid rotor design for high‐speed solid rotor induction motors

Abstract

With its simple construction, excellent mechanical and thermal capabilities to withstand stress, solid rotor induction motors (SRIMs) have become widely used in the areas of high-speed and high-pressure application fields. In this study, a novel solid rotor structure with slits in axial directions, of which the top of the rotor iron teeth is coated with copper, is presented. The design of the novel construction is discussed in detail and all rotor geometrical design parameters are optimised. The performance of the novel rotor design is compared with that of equivalent axial-slit and copper-coated solid rotors. To determine the performances, the systems were simulated by two-dimensional time stepping finite-element analysis. In the novel structure, the fundamental flux can penetrate much deeper than that of a smooth-type induction motor because of the presence of slits. In addition, because of the existence of coating on the top of the teeth, the rotor creates decreased torque ripple resulting in less vibration. The novel rotor design provides a better efficiency with less rotor loss together with a disadvantage of decreased power factor.

Influence of asymmetrical stator axes on the electromagnetic field and driving characteristics of canned induction motor

“…Previous reports highlighted the existence of substantial faults during the operation of a motor [8–11], e.g. rotor axis misalignment, rotor asymmetries, inter‐turn short circuit, etc.…”

“…3 Analysis method of the electromagnetic field and driving characteristics in the ASA conditions Previous reports highlighted the existence of substantial faults during the operation of a motor [8][9][10][11], e.g. rotor axis misalignment, rotor asymmetries, inter-turn short circuit, etc.…”

“…These metallic alloys can cause the electromagnetic field distribution and resulted in the driving characteristic of the CIMs to be different from that of the IMs [7,8]. Different analyses of IMs using structural optimisation, fault diagnosis, mathematical model and multiphysics modelling have been presented in the literature [8][9][10][11][12][13]. Interestingly, the structural similarity between CIM and IM has enabled the CIM to be investigated based on analysis methods of the IMs.…”

Design of a High-Speed Solid-Rotor Induction Machine With an Asymmetric Winding and Suppression of the Current Unbalance by Special Coil Arrangements

“…Mitigating the solid-rotor losses by modifying the rotor itself has also been studied. For example, slitted rotors are widely used to reduce the slip related losses (caused by the fundamental of the air-gap flux density) [10]- [12]. Rotor sleeves (coatings) are highly recommended to suppress the high-frequency eddy-current losses induced by the air-gap flux density harmonics [13]- [15].…”

Application of Improved Process Neural Network Based on the Fireworks Algorithm in the Temperature-Rise Predictions of a Large Generator Rotor

“…For an in-line arrangement of two drag-type hydrokinetic rotors, flow patterns between the two rotors and the rotor performance were investigated [23]. In [24], a novel rotor design provided better efficiency with less rotor loss but showed the disadvantage of a decreased power factor. The use of space vectors and symmetrical components of instantaneous values of currents and voltages was studied in [25].…”