Small high-speed induction motors

Johansson, Mikael; Larsson, Martin; Naslund, L.; Hylander, Jonny

doi:10.1109/iemdc.2003.1211276

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…For high-speed laminated cage rotors, the classical equivalent circuit is well suited to calculate the electromagnetic performances of the machines [41] due to their similarity to standard induction machines. However, this is not the case for smooth solid rotors because they lack the well-defined current paths found in conventional cage rotors.…”

Section: Chaptermentioning

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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Section: Chaptermentioning

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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“…Medium and high-speed induction machines gain more attention due to better efficiency, larger power-to-weight ratio, and smaller size and cost. They can be used without mechanical gear in wide speed range, typically from 1 to 5 (or 6), and mainly operate in field weakening regime [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Stator Voltage Vector Direct Torque Control of induction machine

Matić

Rakić

Vukosavić

2012

2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC)

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This paper presents improved high speed Induction Motor (IM) torque control algorithm that achieves full inverter voltage utilization in field weakening and smooth speed transition from the base speed to high speed region. The Stator Voltage Vector Direct Torque Control (SVV DTC) algorithm simultaneously controls IM torque and rotor flux by regulating stator voltage angle and amplitude in the base speed region, and by regulating only the voltage angle in the field weakening region. Fast torque dynamics is obtained in wide speed range by using torque regulator with variable gain. The main benefit from the proposed algorithm is in field weakening range, in which the machine is supplied by maximal available voltage without outer flux trajectory reference. This approach enables full utilisation of both magnetic material of the machine and power capabilities of the inverter, which is not possible with traditional vector drives with current regulators. Transition from base speed region to field weakening is obtained by simply limiting the output voltage. Experimental results gathered on the high speed low cost IM drive confirm the effectiveness of the proposed SVV DTC approach.

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“…High-speed motors are used in many applications, such as machine tool spindles, centrifugal compressors, vacuum pumps, friction welding units, and turbine generators. Compared with conventional general-purpose motors, the major advantages of high-speed motors are smaller size under a given power, higher power and torque densities, smaller moment of inertia and fast response, and directly connected with other high speed mechanical devices without gears [1,2].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of High-Speed SMC Motor Based on Thermal Network and 3-D FEA With Rotational Core Loss Included

2009

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This paper presents the thermal analysis of a highspeed motor with soft magnetic composite (SMC). Due to the high operation frequency, the core loss is much greater than the other losses and hence is the major heat source in the high-speed motor. Therefore it is of crucial importance to be able to calculate the core loss accurately. In this paper, the rotational core loss model is employed and implemented by using threedimensional (3-D) magnetic field analysis (FEA). Two methods to model the thermal behavior are presented. The first method uses a combination of lumped and distributed thermal parameters, which are obtained from motor dimensions and thermal constants. The second method employs 3-D FEA to accurately calculate the temperature distribution. Core losses are directly coupled into the thermal calculation by keeping the same hexahedral meshing for magnetic field analysis and thermal analysis. A testing bench for the high-speed SMC motor prototype has been set up to measure the core loss. The temperature rises were measured by thermal probes. The calculation and measurement results are compared and discussed.

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Small high-speed induction motors

Cited by 5 publications

References 3 publications

Electromagnetic modelling of high speed induction motors

Electromagnetic modelling of high speed induction motors

Stator Voltage Vector Direct Torque Control of induction machine

Thermal Analysis of High-Speed SMC Motor Based on Thermal Network and 3-D FEA With Rotational Core Loss Included

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