Modeling the influence of commutation in voltage source inverters on rotor losses of permanent magnet machines

Merdzan, M.; Borisavljevic, A.; Lomonova, E. A.

doi:10.1109/epe.2014.6910777

Cited by 11 publications

(27 citation statements)

References 12 publications

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“…In order to illustrate the difference between four considered topologies, Table III shows relative amplitudes (with respect to the fundamental) of first 13 harmonics in winding spatial distribution. Spatial harmonics which are multiple of three are not listed in the table since they do not create a net stator field [28]. From Table III it can be seen that structure used in topology T2 contains both even and odd harmonics in spatial winding distribution, in contrast to other three topologies, which suggests that high rotor losses might be expected.…”

Section: Rotor Losses In High-speed Pm Machines With Different Wmentioning

confidence: 91%

“…The number of stator turns is selected so that all four machines generate a torque corresponding to 3.7 kW of output power at the rotational speed of 240.000 rpm for a high-speed PM generator driven by a micro-gas turbine [28]. To get an impression about difference in number of turns, the fundamental winding factor for all four machines is shown in Table II.…”

Section: Rotor Losses In High-speed Pm Machines With Different Wmentioning

confidence: 99%

“…Since stress in the sleeves due to the connection with magnets and due to rotation act in the same direction, adding up [27], materials with high tensile strength have to be used. In the existing applications different metallic materials such as titanium [13], stainless steel [3], and Inconel [28] can be found. In many high-speed applications metallic sleeves are used for the torque transfer to the shaft, since high-speed PM rotors are often made with solid PM cylinders without the inner shaft in order to avoid high values of stress appearing at inner bore of hollow magnet cylinders [29].…”

Section: B Retaining Sleeve Materialsmentioning

confidence: 99%

“…Time harmonics due to PWM are clearly visible. Calculation of rotor losses caused by PWM harmonics is done using the method presented in [28].…”

Section: Rotor Losses In High-speed Pm Machines With Different Wmentioning

confidence: 99%

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Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM

Merdzan

Paulides

Lomonova

2015

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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. (2015). Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM. In Proceedings of the 10th IEEE International Conference on Ecological Vehicles and Renewable Energies (EVER 2015), March 31 -April 2, 2015. Piscataway: Institute of Electrical and Electronics Engineers (IEEE). General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-Due to development in fields of materials and power electronics, use of high-speed electrical machines has boosted significantly in recent decades. They are widely used in number of applications, such as electrically assisted turbochargers, flywheel energy storage systems, spindle applications, turbo molecular pumps, micro gas turbines. In applications where high efficiency and high power density are required, the most suitable machine type for high-speed operations is a permanent magnet (PM) machine. In this paper the performance of several different topologies of high-speed PM machines required for use in a micro-gas turbine application are evaluated. Different winding topologies, retaining sleeve materials and magnetization patterns are considered, where the main criterion for the machine performance are eddy current losses in the rotor. Influence of time harmonics in stator currents caused by the inverter Pulse Width Modulation (PWM) is incorporated in the calculation.

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Section: Rotor Losses In High-speed Pm Machines With Different Wmentioning

confidence: 91%

Section: Rotor Losses In High-speed Pm Machines With Different Wmentioning

confidence: 99%

Section: B Retaining Sleeve Materialsmentioning

confidence: 99%

“…Time harmonics due to PWM are clearly visible. Calculation of rotor losses caused by PWM harmonics is done using the method presented in [28].…”

Section: Rotor Losses In High-speed Pm Machines With Different Wmentioning

confidence: 99%

See 2 more Smart Citations

Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM

Merdzan

Paulides

Lomonova

2015

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

Self Cite

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“…Although the effect of the PWM on the iron loss has been extensively studied up to this date [2], [3], to the best of the authors' knowledge, the effect of CMVE on the iron loss of electrical machines has not been fully described in details. A theoretical analysis to evaluate the increase of the motor PWM loss due to CMVE for a conventional three-level converter was given in [4]; however, neither iron loss measurements nor computational verifications were performed.…”

Section: Introductionmentioning

confidence: 97%

The Effect of Common-Mode Voltage Elimination on the Iron Loss in Machine Core Laminations of Multilevel Drives

et al. 2015

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This paper studies the effect of common-mode voltage elimination (CMVE) on the iron loss of electrical machine core laminations under multilevel converter supply. Three identical magnetic ring cores are excited by either a three-level converter or a five-level voltage source converter to study the behavior of CMVE on a three-phase system. Both multilevel converters are controlled by using a space vector pulse width modulation as it is one of the most often used techniques for CMVE. These experimental results are confirmed numerically with a dynamic iron loss model. In addition, the effect of CMVE, at different switching frequencies, on the core loss of a synchronous machine is numerically studied. The results presented in this paper show that the core loss is considerably increased when the CMVE is implemented. However this iron loss increase in five-level drive systems is lower compared to the three-level ones. Therefore, it is important that the designers of drive systems take such effects into consideration.Index Terms-Common-mode voltage elimination, iron loss, magnetic material, multilevel converters, pulse width modulation.

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Ultra-light-weight high torque density brushless PM machine design: Considering driving-cycle of a four-wheel drive race car

Paulides¹,

Encica²,

Beernaert

et al. 2015

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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This paper explores the design of an ultra light-weight power and torque dense motor to enhance the performance of a light-weight electric racing vehicle. Such a racing vehicle is to compete in formula student racing events. The state-of-the-art powertrain in these vehicles are axial-field machines or medium speed radial-field machines with a gear. This paper concerns a high speed traction machine radial-field design that closely considers the endurance duty-cycle and/or driving cycle of a race car and provides fast acceleration. The proposed electrical machine is designed to be ultra-light-weight. Therefore, an 18,000 rpm (single gear), 24 slot, 4 pole and 33 Nm brushless highly saturated permanent magnet machine is designed, with an active mass of around 3.0 kg (-10kWlkg and 10 Nmlkg). To account for the various race events, the velocity of the racing tracks is to be closely matched with the machine output characteristics. Within this paper, the design and no-load results will be presented. In the near future (Q2 of 2015), following extended tests, this machine (integrated with a specifically designed single-stage gear) will be used to drive the vehicle using torque vectoring on all four-wheels. We expect that this will result in a significant performance gain in acceleration, endurance and handling characteristics of the 2015 University Racing Eindhoven race vehicle.

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Modeling the influence of commutation in voltage source inverters on rotor losses of permanent magnet machines

Cited by 11 publications

References 12 publications

Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM

Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM

The Effect of Common-Mode Voltage Elimination on the Iron Loss in Machine Core Laminations of Multilevel Drives

Ultra-light-weight high torque density brushless PM machine design: Considering driving-cycle of a four-wheel drive race car

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