BLDC Motor - Thermal Analysis

BLDC Motor - Thermal Analysis

• A production grade BLDC motor required verification of temperature rise during duty cycles; The motor was newly manufactured, and the objective was to verify potential thermal loads that could develop in the windings and magnets, assess insulation life margins, evaluate possible bearing temperature drift, and determine how heat conducts through the housing and interface paths.
  

• Core objectives were to quantify transient temperature fields, verify compliance with material and insulation limits, define margins for planned duty cycles, and identify regions that could gain from targeted cooling adjustments.
  

• A transient 3D thermal model formed the basis of analysis incorporating hex dominant mesh, temperature dependent properties from supplier data, copper loss heat sources mapped to the winding slot regions; contact conductance across stack, magnet, and housing interfaces, and film coefficients on external surfaces to represent convection.
  

• Results showed peak temperatures confined to winding regions, controlled gradients through stator to housing, cooler shaft and bearing zones, and correlation with expected patterns.
  

• Benefits to the client included validated temperature predictions for operating profiles, guidance for insulation class selection, small airflow enhancements near the housing, and reduced hotspot risk that supports durability targets.