In the paper, a validated numerical model describing heat transfer and air flow phenomena in a PM BLDC motor is presented. Validation was performed using the results of multiple velocity and temperature measurements. The air velocity was measured by constant temperature anemometers (CTA) and using Laser Doppler Anemometry (LDA) outside and inside the motor casing, respectively. The temperature measurements were conducted involving over 40 thermocouples located on the stator winding, internal and external casing walls and in the surrounding air. The numerical and experimental results were in a satisfactory agreement.