What question did this study set out to answer?

To design and validate an improved flow-directed oil-cooling system that overcomes winding temperature limits to increase continuous torque in outer-rotor PMSMs.

August 15, 2026Applied Thermal EngineeringOpen Access

Flow-Directed Oil Cooling of an Outer-Rotor PMSM for Electrohydraulic Applications

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Authors

DZDaniil ZadorozhniukLappeenranta-Lahti University of Technology HCHüseyin Tayyer CansevenLappeenranta-Lahti University of Technology ESEero SchermanLAB University of Applied Sciences

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Implication

Experimental study demonstrates flow-directed oil cooling reduces stator winding temperatures in outer-rotor PMSMs, indicating substantial gains in continuous torque capacity.

Key Points

To design and validate an improved flow-directed oil-cooling system that overcomes winding temperature limits to increase continuous torque in outer-rotor PMSMs.
Designed a flow-directed cooling system routing oil through 24 axial stator channels and eight end-winding jets from a single pump.
Coupled a nonlinear hydraulic-network model for flow distribution with a 3D thermal finite-element model utilizing analytical heat-transfer coefficients.
Tested and validated the thermal cooling architecture on a 7 kW, 22.3 Nm outer-rotor PMSM prototype across various flow rates and torque levels.
At 7 kW, 3000 rpm, and 1 L/min oil flow, mean measured winding temperature decreased from ~155 °C with baseline circulation to 92 °C (model predicted 97 °C).
Enabled continuous operation at 150% rated torque at 3.7 L/min with a mean measured winding temperature of ~91 °C (model predicted 96.5 °C).
Validated simulations projected reaching the 155 °C thermal limit at approximately 52 Nm, representing 230% of original rated torque.

Cite This Study

Zadorozhniuk et al. (2026) studied this question.

synapsesocial.com/papers/6a8019ce75c2e31742c8600f https://doi.org/10.1016/j.applthermaleng.2026.132793

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Implication

Experimental study demonstrates flow-directed oil cooling reduces stator winding temperatures in outer-rotor PMSMs, indicating substantial gains in continuous torque capacity.

Flow-Directed Oil Cooling of an Outer-Rotor PMSM for Electrohydraulic Applications

Discussion

Member takes

Implication

Key Points

Cite This Study

Flow-Directed Oil Cooling of an Outer-Rotor PMSM for Electrohydraulic Applications

Discussion

Member takes

Implication

Key Points

Cite This Study

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