Design and thermal analysis on high torque low speed fractional-slot concentrated windings in-wheel traction motor

Huang, Yunkai; Zhu, Zichong; Guo, Baocheng; Lin, Heyun; Fang, Shuhua

doi:10.1109/icelmach.2016.7732720

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…For certain coil connection pattern, k dp is usually calculated through the star of slots diagram [22]. k wp = k dp k pp (4) Fortunately, pitch factor k pp is readily derived and can be written as a general function of p and z, as in (7), where h c is coil pitch and equals to 1 for FSCWMs with tooth coil winding. τ and α s denote the electrical pole pitch angle and slot pitch angle, given by (5) and (6).…”

Section: Pole Number Selection a Pole Number Determinationmentioning

confidence: 99%

“…For FSCWMs used in heavy vehicles with extremely low operation speed and large diameter, the number of poles and slots are usually large to increase torque output and improve heat dissipation in slot center [4]. As a result, hundreds of pole/slot combinations are feasible [5].…”

Section: Introductionmentioning

confidence: 99%

“…According to the conclusions from these comparative studies, multiplying basic pole/slot combination is a common practice when selecting pole and slot numbers for FSCWMs with low speed and/or large diameter. For instance, 40/48 in [13] and 32/36 in [4] have four 10/12 and 8/9 basic combinations (unit motor) respectively. Nevertheless, these combinations derived from multiplying basic pole/slot combinations are not necessarily the best candidates.…”

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: Pole Number Selection a Pole Number Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…In practice, the torque and power generated by a three-phase electric machine depend mainly on its geometrical dimensions, the materials used and design features [14,30,57,[62][63][64][65][66][67][68][69] These parameters are determined by the internal apparent power P i of the machine and the associated internal electromagnetic torque of the machine:…”

Section: Motor Modelingmentioning

confidence: 99%

Design, Analysis of the Location and Materials of Neodymium Magnets on the Torque and Power of In-Wheel External Rotor PMSM for Electric Vehicles

Łebkowski

2018

Energies

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The technology of mounting electric direct drive motors into vehicle wheels has become one of the trends in the field of electric vehicle drive systems. The article presents suggestions for answering the question: How should magnets be mounted on the External Rotor Permanent Magnet Synchronous Machine (ERPMSM) with three phase concentrated windings, to ensure optimal operation of the electric machine in all climatic and weather conditions? The ERPMSM design methodology is discussed. Step by step, a method related to the implementation of subsequent stages of design works and tools (calculation methods) used in this type of work are presented. By means of FEM 2D software, various ERPMSM designs were analyzed in terms of power, torque, rotational speed, cogging torque and torque ripple. The results of numerical calculations related to variations in geometric sizes and application of different base materials for each of ERPMSM machine components are presented. The final parameters of the motor designed for mounting inside the wheel of the vehicle are presented (Power = 53 kW, Torque = 347 Nm; Base speed = 1550 RPM), which correspond to the adopted initial assumptions.

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“…Therefore, predicting the temperature filed precisely and hotspot positions inside the SRM is needed. In order to keep the operating temperature of the SRM within the permitted limit, a cooling system should be developed [8][9][10][11][12][13][14]. Moreover, mechanical characteristics, including acoustic noise and vibration, are significant factors that impact on the operating reliability and service life of the SRM.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Mechanical Analysis of a 72/48 Switched Reluctance Motor for Low-Speed Direct-Drive Mining Applications

Elhomdy

Liu

2019

Applied Sciences

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In the process of electric motor design, it is essential to predict and provide an accurate thermal and mechanical model. The aim of this research is to improve the thermal and mechanical performance—which is implemented into a 72/48 switched reluctance motor (SRM) with 75 kW—of a low-speed direct-drive mining system (pulverizer). Thermal analysis of the SRM requires a deep understanding of the coolant behavior and the thermal mechanism in the motor. Computational fluid dynamics (CFD) based finite element analysis (FEA) was carried out in order to precisely visualize and estimate fluid state and temperature distribution inside the motor. Several different coolant configurations were carried out, with the purpose of determining an appropriate one for uniform temperature distribution in the SRM. The natural frequencies are presented with the developed finite element mechanical, structural model. To adapt in the mining application, the cooling jacket configurations with 17 channels and the shaft with spoke was found to be optimal for the SRM, which may raise the natural frequency and reduce the weight and temperature of the motor. The simulations results showed a good agreement with experimental results regarding temperature distribution within the motor.

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Design and thermal analysis on high torque low speed fractional-slot concentrated windings in-wheel traction motor

Cited by 8 publications

References 29 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

Design, Analysis of the Location and Materials of Neodymium Magnets on the Torque and Power of In-Wheel External Rotor PMSM for Electric Vehicles

Thermal and Mechanical Analysis of a 72/48 Switched Reluctance Motor for Low-Speed Direct-Drive Mining Applications

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