Assessment of fluid drag loss in a flooded rotor electro-hydrostatic actuator motor

Parminder Sangha, Tadashi Sawata, Jason Yon, Phil Mellor

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)


For a permanent magnet (PM) motor used in an electro-hydrostatic actuation system, fluid drag loss in the air gap can be as high as 60% of motor internal losses and affects the motor efficiency; especially at low temperatures where the viscosity of the hydraulic fluid increases significantly. A PM motor has been designed and built to assess electromagnetic, fluid drag loss and dynamic performance. The design process utilised a theoretical equation for the fluid drag loss estimation which assumes a laminar flow. Assumption of the laminar flow has been validated by computational fluid dynamic analysis. A dummy motor was built and the fluid drag losses were measured for various speeds and temperatures. The test results show reasonable agreement with the theoretical calculation although the self-heating effect of the fluid made measurements at constant temperatures difficult.
Original languageEnglish
Title of host publication2015 IEEE International Electric Machines & Drives Conference (IEMDC)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages139 - 142
Publication statusPublished - May 2015

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