Automatic HVAC - BLDC blower motor

In heating, ventilation, and air conditioning (HVAC) systems, using temperature control with PWM driven brushless DC motors improves reliability and efficiency compared to linear operation and brushed motors. This delivers significant performance, fuel and CO2 savings over the vehicle's lifetime.

Block diagram

Design considerations

50 W – 400 W Brushless DC motor drive

  • BLDC preferred for controllability and low power performance

Controlled by 6 MOSFETs operated with PWM

  • puts the focus on switching losses and EMC performance
  • power saving of 100 W on average
  • emission reduction of approx. 0.24 kg CO2 per 100 km.

Applications face a high ambient temperature