CFD and experimental investigation into a non‐intrusive method for measuring cooling air mass flow rate through a synchronous generator

Bersch, Kevin; Connor, Peter H.; Eastwick, Carol; Galea, Michael

doi:10.1049/joe.2018.8236

Cited by 3 publications

(6 citation statements)

References 8 publications

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“…The interfaces between the stationary and rotating parts are modelled with the frozen rotor approach, which is commonly used in quasi-steady CFD e.g. [15,16]. The turbulence is modelled with the standard k-epsilon model since it allows using wall functions in the studied complex geometry.…”

Section: Motor Heat and Mass Transfer Analysismentioning

confidence: 99%

Two Cooling Approaches of an Electrohydraulic Energy Converter For Non-Road Mobile Machinery

Lindh

Tiainen

Grönman

et al. 2023

IEEE Trans. on Ind. Applicat.

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The energy efficiency of non-road mobile machinery can be improved by using e.g. an electric drive system as a servo controller of a hydraulic machine to get an efficient electrohydraulic (EH) converter. However, the cooling of EH devices require more understanding and new innovations. This work presents a design of a 7-kW integrated EH machine and studies its electric motor heat transfer phenomena both experimentally and numerically. Further, to better match the torque and speed performances of the permanent magnet synchronous motor (PMSM) and the hydraulic machine a planetary step-down gear is utilized to triple the output torque of the PMSM. The integrated motor and gear system is then connected to a bent axis piston hydraulic machine, which is capable of operating both as a motor and a pump. Two different electric motor cooling approaches are investigated. The first cooling approach is to use some hydraulic oil inside the motor-gear chamber to let it flow freely as a result of the rotor rotation and move the losses to the surface of the converter cover, which is equipped with some air cooling fins. In the second approach, the oil flows through the converter and removes the losses more effectively. Motor losses and thermal behaviour are studied within these two cooling approaches. Computational fluid dynamic (CFD) simulations are performed to find how the coolant is distributed inside the machine and how heat is distributed in the device.

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Section: Motor Heat and Mass Transfer Analysismentioning

confidence: 99%

Two Cooling Approaches of an Electrohydraulic Energy Converter For Non-Road Mobile Machinery

Lindh

Tiainen

Grönman

et al. 2023

IEEE Trans. on Ind. Applicat.

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“…Similarly, one of the two inlets were moved circumferentially to enable the periodic simplification. Early investigations showed that these simplifications had a negligible influence on the model accuracy (see section V and [26]). The vented machine geometry is shown in Fig.…”

Section: A Model Setupmentioning

confidence: 99%

“…The actual bearing friction torque is complex to calculate and is influenced by a variety of factors, such as the type of bearing, the bearing age, the bearing arrangement, etc. As many of the influencing factors were unknown, a simple analytical approach was chosen to estimate the bearing friction torque MB from the bearing friction coefficient μB, the radial bearing load Fr and the bearing bore diameter dB according to (9) [26].…”

Section: B Torquementioning

confidence: 99%

Thermal and Electromagnetic Stator Vent Design Optimisation for Synchronous Generators

Bersch

Nuzzo

Connor

et al. 2021

IEEE Trans. Energy Convers.

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“…Additionally, the location of one of the two inlets had to be moved circumferentially. However, early investigations and subsequent validation showed that these simplifications only have a negligible influence on the model accuracy (see section C. or [15]) . Fig.…”

Section: A Model Setupmentioning

confidence: 99%

“…The change in mass flow rate and torque with rotational speed is predicted correctly. Further details about the setup and results of the mass flow and torque validation can be found in [15].…”

Section: Experimental Validationmentioning

confidence: 99%

Combined Thermofluid and Electromagnetic Optimisation of Stator Vent Cooling

Bersch¹,

Nuzzo

Connor³

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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A combined electromagnetic and thermal modelling approach has been developed to optimise the design of multiple radial stator vents in an air-cooled, synchronous generator with a power rating of several hundred kVA. An experimentally validated 3-D Conjugate Heat Transfer Computational Fluid Dynamics model has been created and coupled with 2-D Electromagnetic Finite Element Analysis. Correlations between the combined vent width and rotor copper, rotor iron and stator iron losses were derived from the electromagnetic analysis. These correlations were implemented into the optimisation procedure of the parametric thermofluid model. Five parameters: vent locations, widths and the height of a baffle, were optimised simultaneously with the aim of minimising the peak stator winding temperature. The peak stator winding temperature was reduced by 11.1 %. The average stator winding temperature decreased by 6.3 %. To maintain the machine's power output, the removal of active stator material was compensated by increasing the rotor current.

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CFD and experimental investigation into a non‐intrusive method for measuring cooling air mass flow rate through a synchronous generator

Cited by 3 publications

References 8 publications

Two Cooling Approaches of an Electrohydraulic Energy Converter For Non-Road Mobile Machinery

Two Cooling Approaches of an Electrohydraulic Energy Converter For Non-Road Mobile Machinery

Thermal and Electromagnetic Stator Vent Design Optimisation for Synchronous Generators

Combined Thermofluid and Electromagnetic Optimisation of Stator Vent Cooling

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