Transverse edge effect in sheet-rotor induction motors

Bolton, H.R.

doi:10.1049/piee.1969.0144

Cited by 80 publications

(13 citation statements)

References 6 publications

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“…The periodic length τ per for both the complex hybrid model and FEA was selected to be even times the fundamental pitch of one periodical section of the primary τ 1 (in this case, τ per = 12 × τ 1 ). The conductivity of the aluminum plate was reduced accordingly, to take into consideration the transverse end-effects of the investigated motor [18].…”

Section: Results and Model Validationmentioning

confidence: 99%

2D Hybrid Steady-State Magnetic Field Model for Linear Induction Motors

Aleksandrov¹,

Overboom²,

Lomonova³

2019

MCA

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This paper presents a 2D hybrid steady-state magnetic field model, capable of accurately modeling the electromagnetic behavior in a linear induction motor, including primary slotting, finite yoke length, and longitudinal end-effects by primary motion. This model integrates a complex harmonic modeling technique with a discretized magnetic equivalent circuit model. The Fourier model is applied to regions with homogeneous material properties, e.g., air regions and the track of the motor, while the magnetic equivalent circuit (MEC) approach is used for the regions containing non-homogeneous material properties, e.g., the primary of the linear induction motor (LIM). By only meshing the domains containing highly-permeable materials, the computational effort is reduced in comparison with the finite element method (FEM). The model is applied to a double-layer single-sided LIM, and the resulting thrust and normal forces show an excellent agreement with respect to finite element analysis and measurement data.

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Section: Results and Model Validationmentioning

confidence: 99%

2D Hybrid Steady-State Magnetic Field Model for Linear Induction Motors

Aleksandrov¹,

Overboom²,

Lomonova³

2019

MCA

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“…22 shows eddy current distributio n fo r short shell. The calculated differential induced voltage is 110 µV in long shell aluminum model and it becomes 66 µV in short shell aluminum model due to the modified path for induced eddy currents [23]- [24]. Fig.…”

Section: Methodsmentioning

confidence: 91%

Rotational Eddy Current Speed Sensor

et al. 2019

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A novel eddy current speed sensor is develope d to measure rotational speed of conductive o bj e ct s. Th e s e nso r co ns ist s o f o n e e xcitation coil and two pick up coils around rotating cylinder or rod. The sensor does not use magnetic y o ke. Fo r t h e a n aly si s a n d e xperimental verification we used 30 mm diameter non-magnetic aluminum and also magnetic solid iron cylinders. The calculated and me asured speed range is until 1200 rpm. 2D analytical method is developed to calculate sensor performance. 2D finite element i s a l so use d for simulations to compare results with 2D analytical method. 3D finite elemen t a n a lys is i s requ ired t o t a k e i nt o a cco u nt significant 3D effects due to the air coils configuration. The experimental results are presented at different steady s t a te s pe eds. Th e calculations results are compared with measurements to validate theoretical models and sensor performance. The eddy current s pe ed se nsor shows high linearity even at low speeds. For ferromagnetic rods we suggest novel double-layer configura t io n: n on-m ag net ic conductive ring or shell on top of the iron rod minimizes the influence of the permeability changes. The main advantage o f t h e n o vel se nsor is that it has neither mechanical nor electrical contact to the rotating rod.

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“…Fringe fluxes, for instance, are seen to be present just outside the air gap, and these will tend to augment the motor's active flux per pole. Some allowance can be made for this by artificially increasing the stator width, 8 an addition of one air-gap length giving curves in Figs. 3d, Ad and 5d.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Forces in induction motors with laterally asymmetric sheet secondaries

Bolton

1970

Proc. Inst. Electr. Eng. UK

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An analysis is presented for the problem of the sheet-secondary induction motor when the sheet is displaced sideways from a symmetrical position. It is shown that the forces which act on the sheet are decentralising and that the magnitude of these forces and of the changes in propulsive force and winding impedance are dependent on five dimensionless parameters which are functions of the motor's design and its operating slip. Measurements made on a small linear motor, while indicating that the neglected skin effect and endwinding leakage fluxes can be significant, show reasonable agreement with the analysis. A means of reducing the decentralising force is suggested, and reference is made to a method of achieving lateral stabilisation of a freely suspended sheet. List of principal symbolsWhere appropriate, symbols in capital letters indicate the peak values of phasor quantities. a b c,d E

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Transverse edge effect in sheet-rotor induction motors

Cited by 80 publications

References 6 publications

2D Hybrid Steady-State Magnetic Field Model for Linear Induction Motors

2D Hybrid Steady-State Magnetic Field Model for Linear Induction Motors

Rotational Eddy Current Speed Sensor

Forces in induction motors with laterally asymmetric sheet secondaries

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