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This paper investigates the back EMFs of four surface-mounted permanent magnet machines with different winding arrangements for education purpose. They are a): a 4-pole machine with integral-slot distributed winding, b): an 8-pole machine with fractional-slot distributed winding, c): a 12-pole machine with integral-slot concentrated winding and d): a 24-pole machine with fractional-slot concentrated...
As a new type of induction machine, brushless doubly-fed machine (BDFM) has excellent speed regulation performance and can run in the condition of variable-speed-constant-frequency power generation. It has good applicable potentials on energy-saving-speed-adjusting motors and wind power generation system, but its structure and operating principle are more complex. To study the effect of different...
The paper shows how the techniques of generalised harmonic analysis may be used to simulate the steady-state behaviour of a multi-phase cage induction motor with any form of open-circuit or short-circuit fault in the stator winding. The analytical model is verified using a 4-pole machine with a 48-slot stator. Each coil of the stator winding of this machine is brought out to a patch-board that enables...
This paper discusses the design of a fault tolerant electric motor for an aircraft main engine fuel pump. The motor in question is a four phase fault tolerant motor with separated windings and a six pole permanent magnet rotor. Methods of reducing machine losses in both the rotor and stator are introduced and discussed. The methods used to calculate rotor eddy current losses are examined. 3D finite...
In this paper, we investigate the main factors of the stray load loss of cage induction motors from both results of the measurement and analysis. The losses generated at the rotor cage, stator and rotor cores are calculated by the finite element analysis, respectively. To consider the inter-bar current loss, which is produced by the eddy currents at the rotor core between the bars, the 3-D analysis...
Stator current spectral analysis techniques are usually used to detect rotational faults in induction motors. However, position-varying load torque oscillation at multiples of the rotational speed has exactly the same effect. Harmonics resulting from the load torque oscillation often obscure or even overwhelm the detection of rotor faults since the magnitudes of a load torque oscillation induced harmonics...
The reliability of the loss calculation is a very important issue during the electrical design phase of hydro generators. Therefore, the accurate calculation of eddy currents in the stator clamping system is a matter of particular interest with initial design and design optimization. Due to the nonlinear magnetic behaviour of the clamping plate, the eddy current losses in these regions can reach high...
An analytical method used to predict the magnetic field in an interior permanent magnet (IPM) motor, is developed and validated in this paper. By using space harmonic analysis and conformal transformation (or conformal mapping (CM)) techniques, the air-gap magnetic field distribution, with considering of stator slots effect and rotor saliency effect, is precisely calculated. The accuracy of this analytical...
In this paper, a new space vector modulation (SVM) technique for six-phase induction machines (SPIM) is presented. The machine has two three phase stator windings spatially shifted by 60 electrical degrees and connected to a single neutral. The neutral point may be connected to the source or not. It is shown that existing SVM techniques fail to reduce significantly harmonic currents for these machines...
We have investigated a method to regulate the voltages in the secondary windings of an induction machine stator with multiple windings. By introducing one or more triple-n harmonics in a three-phase machine, the rectified output voltage of one or more grounded-wye windings can be controlled and regulated. Voltage regulation is achieved through triple-n harmonic current injection, so there is no net...
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