Performance calculation for a high speed solid-rotor induction motor

Gieras, Jacek F.

doi:10.1109/iecon.2010.5675415

Cited by 27 publications

(38 citation statements)

References 35 publications

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“…Second layer could be any other nonmagnetic metal such as copper or brass. Double layer moving or rotating part is well known configuration to improve performance of solid rotor rotating induct ion mo t or or solid secondary linear induction motors [21]- [22]. It increases equivalent conductivity of rotating ro d an d causes low magnetic reluctance using high permeability iron part.…”

Section: Methodsmentioning

confidence: 99%

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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Section: Methodsmentioning

confidence: 99%

Rotational Eddy Current Speed Sensor

et al. 2019

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“…This type of topology has a tip speed limit of 550 (m/s) [7]. The higher stator-iron-torotor-iron air gap, compared to cage constructions, also reduces the higher harmonics by increasing the copper coating thickness, but there is a limit in the coating thickness.…”

Section: Chaptermentioning

confidence: 99%

“…Research examples in copper-coated SRIMs are: 300 (kW), 1000 (Hz), 2-pole compressor [7]; 800 (Hz), 2-pole induction machine [8]; 1500 (W), 666 (Hz), 2-pole induction machine [30]; 60 (kW), 1000 (Hz), 2-pole compressor [21].…”

Section: Chapter 2 Literature Review -High-speed Electrical Machinesmentioning

confidence: 99%

Electromagnetic modelling of high speed induction motors

Velázquez¹,

Smith²

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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Improvement in the power density of induction machines can be achieved when they operate at high rotational speeds using frequency converters that provide a higher frequency supply to the motor. Applications such as compressors require intrinsically high-speed operation. In these cases the mechanical integrity is prioritized over the electromagnetic performance and solid rotors are normally used instead of laminated rotors so they can withstand the peripheral and radial stresses caused by the high speeds. Small skin depths are associated with solid rotor structures; this complicates the electromagnetic analysis when FE modelling is used because a fine mesh is typically required. Although analytical methods in general tend to be less accurate than FE models, they can provide faster and reasonably accurate results. This thesis evaluates the use of an analytical multi-layer model as a preliminary design tool for determining the electromagnetic performance of high-speed copper-coated solid rotors. A simple FE model is developed in order to validate the results obtained from the analytical model. The input to the analytical multi-layer and FE models is normally current; consequently they are modified to work with voltage as the input reference. The multi-layer model is compared under constant current operation and constant voltage operation. The limitations of the analytical multi-layer model are highlighted. Declaration 13 Declaration No portion of the work referred to in the thesis has been submitted in support of an application for another degree or qualification of this or any other university or other institute of learning.

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“…Of course, the presented simplified circuit approach (performed under assumption of linear B-H curve) does not take into account many essential effects and phenomena connected with two-layer rotor (iron body coated with copper) which are described in details e.g. [1,2]. In order to consider this problem properly in the whole range it is necessary to take into account eddy currents penetrating copper layer, as well as non-linear permeability of ferromagnetic layer what are reason for making electromagnetic calculations intricate and complex (requiring also analysis based on partial differential equations).…”

Section: Design Of Rotary Module -"Transformation Of Structure" mentioning

confidence: 99%

“…Although, the performance calculation for induction motor with double-layer rotor is similar to that of a squirrel-cage induction motor the electromagnetic effects are more complex. The effects of attenuating magnetic field in copper and steel layers by eddy currents can be described with the help of the equivalent circuit in which all rotor parameters are dependent on slip s. Such a model (the equivalent circuit with slip-dependent parameters which is presented in Fig.9), as well as the corresponding expression for rotor impedance was given in [1,2]. The torque v. slip and current v. slip curves calculated according to the above-presented equivalent circuit and according to dependences for its parameters included in [1][2][3] were calculated for the rotary module in point and are presented in Fig.10 against the background of lower and upper extreme curves.…”

Section: Advanced Circuit Theorymentioning

confidence: 99%

How to convert a factory-manufactured induction motor into rotary-linear motor? Part 2 design issues from viewpoint of educational purposes and industrial demands

Kluszczyński

Szczygieł

2014

15th International Workshop on Research and Education in Mechatronics (REM)

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2DoF rotary-linear motor is perfect study case to show that both circuit and field methods are very helpful and effective in mastering design abilities. The proposed circuit design method is termed "transformation of structure" method. Its essence is to change step by step the basic 3-phase induction motor into the desired rotary module of the 2DoF induction motor. What is important, "transformation of structure" is accompanied by detailed analytical study showing in simultaneous way conversion of the most significant curves from one phase into the another. The calculations are based on the modified equivalent circuit. As regards field design method, it employs Maxwell and FEMM program. Comparison of the results obtained with the help of circuit and field methods shows evidently advantages and disadvantages of each method, as well as confirms, in general, their equivalency.

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Performance calculation for a high speed solid-rotor induction motor

Cited by 27 publications

References 35 publications

Rotational Eddy Current Speed Sensor

Rotational Eddy Current Speed Sensor

Electromagnetic modelling of high speed induction motors

How to convert a factory-manufactured induction motor into rotary-linear motor? Part 2 design issues from viewpoint of educational purposes and industrial demands

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