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Induction motors (IMs) provide the driving force for the industry. A kurtosis energy based spectrum synch (KESS) technique is proposed in this work to detect incipient IM broken rotor bar defect using electric current signals. In IM fault detection, the proposed KESS technique will capture the peakedness of the fault frequency components distributed over several fault related local bands. These bands...
In many direct-drive applications such as servo system, wind power generation, etc., it is desirable to use motors having a high torque density at a low rotation speed without reduction gears for the improvement of noises, reliability and maintenance.
Flux-modulation power-split devices for hybrid electrical vehicle (HEV)s have been obtaining attentions in recent years due to its brushless and high torque density. However, the flux-modulation power-split devices always suffered from low power factor, which is even lower than 0.6 and results in higher cost and larger volume in the converter. This paper proposes a novel dual mechanical port, spoke...
Eddy current loss is a typical problem in permanent magnet machines especially in machines equipped with fractional-slot concentrated windings. PM segmentation which cut the circulating path of eddy current in radial flux PM machines have been widely studied in literature to reduce this loss. Both circumferential and axial magnet segmentations were evaluated by an analytical method concerning the...
Two main drawbacks of flux reversal machines (FRMs) are high cogging torque and low power factor, among which the latter one has not been addressed. This paper proposes an analytical method based on winding function theory to analyze the power factor of a FRM. Firstly, the back-EMF, synchronous inductance and power factor of a FRM are derived. With the employment of the equations, the main reason...
A finite element model is used for flexural vibration analysis of a static (non-rotating) rotor with two open cracks, and the stiffness matrices of the cracked elements are obtained using transfer matrix analysis and local flexibility theorem. Through numerical simulation, the effects of the slenderness ratio and the crack depth on the mode shapes and the changes in the eigenfrequencies of the cracked...
Based on the simple hinge crack model, the dynamic equation of a rotor containing transverse crack and initial deflection is modelled in dimensionless form, which can be applied to the vibration analysis of cracked rotor with different parameters at stationary, transient and nonlinear state. By analytical solution, the frequency components of the cracked rotor with initial deflection are compared...
A finite element (FE) model, which is based on transfer matrix analysis and local flexibility theorem, is introduced for crack identification of a static (non-rotating) rotor with an open crack. Through numerical simulation, the effects of the location and depth of the crack on the mode shapes and the changes in the eigenfrequencies of the cracked rotor are investigated, and the ratio of the changes...
Based on the simple hinge crack model, the dynamic equation of a rotor containing transverse crack and initial deflection is modelled in dimensionless form, which can be applied to the vibration analysis of cracked rotor with different parameters at stationary, transient and nonlinear state. By analytical solution, the frequency components of the cracked rotor with initial deflection are analyzed,...
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