Pole-Slot Selection Considerations for Double Layer Three-phase Tooth-Coil Wound Electrical Machines

Skoog, Stefan; Acquaviva, Alessandro

doi:10.1109/icelmach.2018.8506772

Cited by 13 publications

(6 citation statements)

References 16 publications

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“…A pole-pair number of five or six will now set the maximum mechanical speed to 14.4 and 12 krpm, respectively. Using the methodology presented in [13], the only slot (Q)-pole (p) options left for a balanced three-phase machine are Q6p8, Q12p8, Q12p10 and Q9p12, all illustrated in Figure 1. A FEA comparison between these four feasible pole-slot combinations in terms of output torque and iron losses at 300 Hz electrical frequency is shown in Figure 2.…”

Section: Electromagnetic Analytical Sizing and Design Choicesmentioning

confidence: 99%

“…The Q12p10 offers the best balance between high fundamental winding factor and low harmonic leakage inductance factor; 0.933 and 0.97 respectively. More high-level performance indices are derived in [13].…”

Section: Electromagnetic Analytical Sizing and Design Choicesmentioning

confidence: 99%

“…The coil disposition and geometries of stator and rotor with details about disposition of conductors and cooling channels are shown in Figure 3. The Q12p10 machine has a key winding factor [13] of 2, meaning each phase coil consists of two electrically series connected coils on adjacent teeth. Each coil has 28 turns, which allows for a 1.6 mm diameter enamel copper wire to be used and avoiding parallel strands in the coils.…”

Section: Q12p8 Q6p8mentioning

confidence: 99%

“…The resulting pressure drop is measured to 37.6 kPa at the maximum oil flow of 6.0 l/min at room temperature. This type of utilization of part of the stator yoke to introduce cooling channels can be generalized for all TCWMs featuring a key winding factor equal to an even integer; which corresponds to an even number of adjacent tooth-coils belonging to the same phase winding [13].…”

Section: Cooling Channel Size and Electromagnetic Effectsmentioning

confidence: 99%

“…With this machine type, it may be possible to devote some of the space that is normally used for active material, for cooling channels instead, without sacrificing performance. Still, it offers high torque density and high efficiency [12][13][14] when combined with a permanent magnet (PM) rotor, as well as low cost manufacturing. In [15], a 12-slot 8-pole TCWM for traction application is compared with a distributed winding (DW) interior-magnet, a switched reluctance, and an induction machine.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application

et al. 2020

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Tooth coil winding machines offer a low cost manufacturing process, high efficiency and high power density, making these attractive for traction applications. Using direct oil cooling in combination with tooth coil windings is an effective way of reaching higher power densities compared to an external cooling jacket. In this paper, the validation of the electromagnetic design for an automotive 600 V, 50 kW tooth coil winding traction machine is presented. The design process is a combination of an analytical sizing process and FEA optimization. It is shown that removing iron in the stator yoke for cooling channels does not affect electromagnetic performance significantly. In a previous publication, the machine is shown to be thermally capable of 25 A/mm 2 (105 Nm) continuously, and 35 A/mm 2 (140 Nm) during a 10 s peak with 6 l/min oil cooling. In this paper, inductance, torque and back EMF are measured and compared with FEA results showing very good agreement with the numerical design. Furthermore, the efficiency of the machine is validated by direct loss measurements, using a custom built calorimetric set-up in six operating points with an agreement within 0.9 units of percent between FEA and measured results.

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Section: Electromagnetic Analytical Sizing and Design Choicesmentioning

confidence: 99%

Section: Electromagnetic Analytical Sizing and Design Choicesmentioning

confidence: 99%

Section: Q12p8 Q6p8mentioning

confidence: 99%

Section: Cooling Channel Size and Electromagnetic Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application

et al. 2020

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Analysis and Design of an Axial Flux Permanent Magnet Motor for in-Wheel System Using a Novel Analytical Method Combined With a Numerical Method

Tak

2020

IEEE Access

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Analysis on Circulating Current Loss in the Formed Winding of Permanent Magnet Synchronous Motors

et al. 2021

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Permanent magnet synchronous motors with the formed winding can not only improve the slot fill factor and heat dissipation capacity but also effectively reduce the additional loss in the winding. Formed winding permanent magnet synchronous motors will become the future development tendency. Due to inherent features of the formed winding, the circulating current loss is a non-negligible issue. This paper proposes using the formed winding in permanent magnet synchronous motors and analyzes the circulating current loss in the formed winding. First, the finite element models of integer slot and fractional slot motors are established, and the magnetic field analysis are carried out. Then two commonly used methods of calculating circulating current loss are introduced in detail, and their calculation results are compared. Moreover, the high-precision field-circuit coupled finite element method is used to calculate the circulating current loss of integer and fractional motors. And circulating currents of the hairpin winding and the formed winding are compared. The analysis indicates that the circulating current in the formed winding cannot be ignored. Finally, comprehensive and in-depth research on the influencing factors of circulating current loss in the formed winding has been conducted. The results clarify that the number of parallel strands, the width of the slot opening, and the stator current have a considerable influence on the circulating current loss. INDEX TERMSCirculating current loss, field-circuit coupling, permanent magnet synchronous motors, slot-pole combination, the formed winding.

show abstract

Pole-Slot Selection Considerations for Double Layer Three-phase Tooth-Coil Wound Electrical Machines

Cited by 13 publications

References 16 publications

Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application

Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application

Analysis and Design of an Axial Flux Permanent Magnet Motor for in-Wheel System Using a Novel Analytical Method Combined With a Numerical Method

Analysis on Circulating Current Loss in the Formed Winding of Permanent Magnet Synchronous Motors

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