Rotor Surface Ferrite Permanent Magnets in Electrical Machines: Advantages and Limitations

Petrov, Ilya; Niemelä, Markku; Ponomarev, Pavel; Pyrhönen, Juha

doi:10.1109/tie.2017.2677320

Cited by 58 publications

(24 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A rotor yoke in outer rotor PMSMs can be made of solid steel to improve robustness and simplicity [18]. However, in TCW PMSMs there is a wide range of harmonics in the air gap current linkage spectrum [18], [19], which leads to significant losses in the rotor yokes made of solid steel. These losses are the price one has to pay when using a simple rotor construction together with a TCW.…”

Section: Electromagnetic Parameters Of the Modular 24-slot 20-polmentioning

confidence: 99%

Fault-Tolerant Modular Stator Concentrated Winding Permanent Magnet Machine

Petrov

Lindh

et al. 2020

IEEE Access

Self Cite

View full text Add to dashboard Cite

This paper studies a modular permanent magnet synchronous machine (MPMSM) converted from a traditional single-core 24-slot 20-pole tooth-coil winding permanent magnet synchronous machine (TCW PMSM). The performance of the TCW PMSM is compared with the performance of the MPMSM (rearranged from this TCW PMSM) by the finite element method (FEM). It is found that if an electrical machine with a modular structure is designed, the efficiency of the MPMSM may be degraded compared with the conventional structure, especially, if a solid rotor yoke is used. However, the advantages of the proposed MPMSM are related to an option to scale up the machine by applying a certain number of modules, or removing faulty modules (while keeping the healthy modules working). This makes this type of a motor design applicable in certain life-critical applications, or in applications where scaling of the motor power might be needed. As a prototype, a low-power, low-speed generator added to a hook block of a hoist to supply power to measurement electronics is studied.

show abstract

Section: Electromagnetic Parameters Of the Modular 24-slot 20-polmentioning

confidence: 99%

Fault-Tolerant Modular Stator Concentrated Winding Permanent Magnet Machine

Petrov

Lindh

et al. 2020

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to References [4,34], it can be found that for FSCWs, the most harmful MMF harmonics are those which are close to the fundamental harmonic (also called the synchronous harmonic in Reference [4]). Here, for a 5-pole-pair FSCW machine, the most harmful MMF harmonics will be the 1st and 7th harmonics, knowing that the fundamental harmonic is the fifth harmonic.…”

Section: Winding Configurations and Mmf Analysismentioning

confidence: 99%

“…Unfortunately, the volatile price of NdFeB after 2011 as well as a limited flux-weakening capacity have immensely limited their further development for EV applications, which require a low cost and a wide speed range [4]. For this reason, owing to their advantages such as mature technology, robust structure, relatively low cost, and excellent flux-weakening performance, induction machines (IMs) are often more competitive for EV applications [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of Stator MMF Harmonics on the Utilization of Reluctance Torque in Six-Phase PMA-SynRM with FSCW

et al. 2018

View full text Add to dashboard Cite

Abstract:Although fractional-slot concentrated winding (FSCW) offers many significant advantages, such as short end-turn windings, high slot filling factor, and low cogging torque, it is frequently limited by excessive stator magnetomotive force (MMF) harmonics which will induce high eddy losses in the permanent magnets (PMs). What is more, in the literature, it can be observed that the reluctance torque of the salient-pole machine with FSCW is usually much lower than that obtained with integral slot winding. To explore the underlying reason why the reluctance torque in a salient machine with FSCW significantly decreases, a new six-phase FSCW with 24 slots and 10 poles, which can significantly reduce the undesirable stator MMF harmonics, is obtained by using the concept of stator shifting. Then, two permanent-magnet-assisted synchronous reluctance machines (PMA-SynRMs) with the proposed winding layout and conventional asymmetric 12-slot/10-pole six-phase winding layout are designed and simulated by the finite-element method (FEM). The reluctance torque, total torque, and d/q-axis inductances with different current phase angles are also compared under different loaded conditions. The results show that a reduction in stator MMF harmonics can indeed lead to a significant enhancement in reluctance torque under heavy loaded conditions, while the dominance will diminish under light loaded conditions.

show abstract

“…The advantages of PMSMs compared to induction motors have been discussed previously [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

A Method for Efficiency Determination of Permanent Magnet Synchronous Motor

et al. 2020

View full text Add to dashboard Cite

The utilization rate of permanent magnet synchronous motors (PMSM) is increasing in the industry today. Due to this fact, the high efficiency ratio of PMSMs has reached IE5 premium class efficiency. Therefore, the efficiency coefficient of the PMSM varies from 92% to 97%. As a result, this type of motor is replacing traditional asynchronous motor by falling into efficiency classes of IE1, IE2, IE3, and IE4, which range from 75% to 92% in the industry. Thus, the object of the research was to develop a method to determine the efficiency of permanent magnet synchronous motor applications in order to identify and verify the variating parameters. In this study, an innovative and safe method of PMSM testing when the nominal parameters of the motor are unknown was presented through research. Also, the comparison of PMSM oscillograms with different types of load types and phase shift oscillograms, generated using operation amplifier, were analyzed and is scrutinized. During the design process, the PMSM was projected for the IE5 premium efficiency class. However, after production, the PMSM sometimes does not match the nameplate parameters, which are declared by the factory. As a result, during the testing procedures, the PMSM nameplate parameters did not match the projected parameters. Facing the problem of the projected and tested efficiency mismatch, the PMSM highest efficiency determination experiments were performed in a laboratory in order to prove the highest efficiency of the PMSM. The results showed different PMSM input parameters. Furthermore, the experimental results of the PMSM testing were confirmed with electrical machines theory, and simulation results were performed with electrical circuits. The theory of PMSM operating in different values of input voltage is represented in graphical abstract.

show abstract

Rotor Surface Ferrite Permanent Magnets in Electrical Machines: Advantages and Limitations

Cited by 58 publications

References 21 publications

Fault-Tolerant Modular Stator Concentrated Winding Permanent Magnet Machine

Fault-Tolerant Modular Stator Concentrated Winding Permanent Magnet Machine

Influence of Stator MMF Harmonics on the Utilization of Reluctance Torque in Six-Phase PMA-SynRM with FSCW

A Method for Efficiency Determination of Permanent Magnet Synchronous Motor

Contact Info

Product

Resources

About