| 1. |
- Acquaviva, Alessandro, 1987, et al.
(författare)
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Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application
- 2020
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Ingår i: Energies. - : MDPI AG. - 1996-1073 .- 1996-1073. ; 13:13
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Tidskriftsartikel (refereegranskat)abstract
- 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/mm2 (105 Nm) continuously, and 35 A/mm2 (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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| 2. |
- Acquaviva, Alessandro, 1987, et al.
(författare)
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Manufacturing of tooth coil winding PM machines with in-slot oil cooling
- 2020
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Ingår i: Proceedings - 2020 International Conference on Electrical Machines, ICEM 2020. - 9781728199450 ; , s. 2314-2320
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Konferensbidrag (refereegranskat)abstract
- This paper presents a description of the manufacturing challenges and solutions of two 50 kW radial flux inner-rotor tooth coil winding PM machines with in-slot cooling for vehicle application. The two machines are designed for different DC link voltages, 600 V and 48 V, and to achieve high efficiency and high power density. To enable this, liquid cooling is necessary. In the solution presented, the oil coolant is pushed through the stator yoke and in the slots with the intent of removing the heat close to the loss generation. The cooling channels in the slots are built during the stator potting process using a high thermally conductive potting material. The machines presented in this paper are designed for high speed operation and capable to withstand RMS current densities of 25 A/mm2 in continuous operation and 35 A/mm2 for 30 s peaks, at 6 1/min oil flow and a inlet temperature of 20oC. It is shown that stator is designed to be compatible with automated manufacturing for high volume production with a set of suggested improvements.
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| 3. |
- Rodionov, Artem, 1990, et al.
(författare)
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Sizing and energy efficiency analysis of a multi-phase FSCW PMSM drive for traction application
- 2020
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Ingår i: IECON Proceedings (Industrial Electronics Conference). - 2577-1647 .- 2162-4704. ; 2020-October, s. 2069-2074
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Konferensbidrag (refereegranskat)abstract
- This paper investigates the properties of multi-phase drive systems for electric propulsion systems in terms sizing and drive cycle performance.A multi-phase solution offers improved system safety due to redundancy. A 12 slot 10 poles fractional slot winding machine is chosen due to its promising characteristics in terms of short end-windings and ease for mass production utilizing pre-wound coils. The same machine can be reconfigured to be utilized both in 3-phase, using a single inverter, and in 6-phase mode using two 3-phase inverters. IGBT and SiC based inverter topologies are investigated for both 3-phase and 6-phase systems. In the multiphase mode the capacitor bank current rating can be reduced by 43.5% if PWM carrier shift is exploited.Multiple drive cycle studies are performed. For the 6-phase system a total reduction of electric machine losses of up to 4.6% and up to 3.8% inverter losses are reported.
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