Scalability of surface PM machines with concentrated windings designed to achieve wide speed ranges of constant-power operation

El-Refaie, Ayman; Jahns, T.M.

doi:10.1109/iemdc.2005.195949

Cited by 6 publications

(8 citation statements)

References 17 publications

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“…where N a (θ) and N b (θ) are winding functions of phase A and B, θ is the angular measure along the air gap (in mechanical reference), δ is the length of effective air gap (the sum of physical air gap, the thickness of retaining sleeve, and the thickness of PM). Self-inductance L can be obtained using (15) as well if replace N b (θ ) with N a (θ ). Winding functions are usually decomposed to Fourier series for harmonic analysis and written as…”

Section: B Air-gap Inductancementioning

confidence: 99%

“…Self-and mutual components of L g can be calculated together by replacing N b (θ ) in (15) with synthesized 3-phase winding function N abc (θ), as given in (18).…”

Section: B Air-gap Inductancementioning

confidence: 99%

“…Therefore, it is difficult to reasonably compare the flux-weakening ability of these combinations. There are few researches involved in this aspect [15], [16], especially regarding the influence of pole numbers.…”

Section: Introductionmentioning

confidence: 99%

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Investigation Study of the Influence of Pole Numbers on Torque Density and Flux-Weakening Ability of Fractional Slot Concentrated Winding Wheel-Hub Machines

et al. 2019

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Fractional slot concentrated winding machines (FSCWMs) with the low operation speed and large diameter usually have a large number of poles and slots; thus, numerous pole/slot combinations are feasible. The common practice to choose pole/slot combinations by multiplying the basic combinations may neglect some competitive candidates. Taking 36-slot FSCWMs as examples, this paper investigates the influence of pole numbers on torque density and flux-weakening ability, the two most vital performances of wheel-hub machine. It is shown that the machines with pole number slightly less than the slot number have the highest torque densities. Each component of synchronous inductance is separately analyzed, and its variation against pole numbers shows obvious regularity. Machines with pole numbers larger than the slot numbers have an excellent flux-weakening ability due to the large inductance and small permanent magnet flux linkage. The measurements together with the finite element analysis results confirm that the stator leakage inductance contributes the most to the superior flux-weakening ability. The identical analysis is also performed on 54-slot and 81-slot FSCWMs, with similar regularities observed.

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Section: B Air-gap Inductancementioning

confidence: 99%

“…Self-and mutual components of L g can be calculated together by replacing N b (θ ) in (15) with synthesized 3-phase winding function N abc (θ), as given in (18).…”

Section: B Air-gap Inductancementioning

confidence: 99%

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Investigation Study of the Influence of Pole Numbers on Torque Density and Flux-Weakening Ability of Fractional Slot Concentrated Winding Wheel-Hub Machines

et al. 2019

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“…I N RECENT years, permanent magnet (PM) machines, especially fractional slots concentrated winding PM machines, have been widely used in many applications [1]- [6], such as servo motors, wind generators, traction motors, etc. As a special topology of PM machines, flux switching permanent magnet (FSPM) machines were first introduced in 1955 [7], but at that time this topology did not received many interest due to immature process, poor performance, and high price of PMs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Flux Switching Permanent Magnet Machines

et al. 2016

IEEE Trans. Energy Convers.

126

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This paper investigates the nature of a flux switching permanent magnet (FSPM) machine based on the flux harmonic theory. First, analytical expressions for air-gap flux density distribution, back-electromagnetic force (EMF), and torque are developed to analyze the electromagnetic features of FSPM machines. It is found that the conventional winding theory, such as star of slots, can be directly employed to analyze FSPM machines without any modification. Combinations of stator and rotor teeth, winding connection, and conditions for symmetrical-phase back-EMF waveform are analyzed and obtained using star of slots. The armature winding pole pairs of FSPM machines are redefined. Based on this new concept and the proposed analytical expressions, slots per phase per pole and winding factor in FSPM machines are derived, a new type winding configuration with overlapping windings for FSPM machines is predicted and verified to be with ∼90% larger back EMF than those of conventional FSPM machines with nonoverlapping windings. All these analysis results are validated by finite element analyzes. IndexTerms-Air-gap permeance function, backelectromagnetic force (EMF), flux switching permanent magnet (FSPM) machines, winding configuration.

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“…Further, the cogging torque can be extremely low, without the use of design features such as skew. However, the research which has been reported to date has focused on the electromagnetic and control performance, in terms of torque density [1]- [20], cogging torque [21]- [23], rotor eddy current loss [24][25][26][27], and flux-weakening performance [28][29][30] etc.…”

Section: Introductionmentioning

confidence: 99%

Analytical modelling and finite element computation of radial vibration force in fractional-slot permanent magnet brushless machines

Zhu

Xia

et al. 2009

2009 IEEE International Electric Machines and Drives Conference

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Analytical models have been developed for analysing the radial vibration force in fractional-slot permanent magnet machines and validated extensively by finite element analyses. They are used to investigate the influence of (a) stator slotting, (b) tangential field component, (c) radius in the airgap for computation, and (d) load condition etc. on the radial vibration force calculation. The major findings can be summarised as follows. (1) Even on open-circuit, the low harmonic component (e.g. 2 nd for 10-pole/12-slot machine, and 1 st for 8-pole/9-slot machine) of radial force exists due to slotting effect although the amplitude is relatively low, while the slotless analytical model cannot predict this phenomenon; (2) However, on load, slotless analytical model is accurate enough in the radial force analysis, since in this case, the low order harmonic component of radial force is mainly due to the interaction between the magnet field and the armature reaction field, and is largely determined by the combination of pole and slot numbers; (3) It is much more reliable to calculate the radial force in the middle of airgap, rather than close to the stator bore, while the harmonic contents of radial force are almost independent of radius in the airgap; (4) The simple formula accounts only for the radial field component in the middle of airgap is accurate enough for radial force calculation.

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Scalability of surface PM machines with concentrated windings designed to achieve wide speed ranges of constant-power operation

Cited by 6 publications

References 17 publications

Investigation Study of the Influence of Pole Numbers on Torque Density and Flux-Weakening Ability of Fractional Slot Concentrated Winding Wheel-Hub Machines

Investigation Study of the Influence of Pole Numbers on Torque Density and Flux-Weakening Ability of Fractional Slot Concentrated Winding Wheel-Hub Machines

Synthesis of Flux Switching Permanent Magnet Machines

Analytical modelling and finite element computation of radial vibration force in fractional-slot permanent magnet brushless machines

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