Brushless DC Motor

As more and more applications rely on the brushless DC motor – medical equipment, home appliances, building controls and industrial automation – there's increased pressure to increase their energy efficiency. Advanced solutions from Infineon, such as our family of configurable H-bridge and 3-phase gate driver ICs that can be combined with powerful Infineon MOSFETs, provide the power, efficiency and reliability your systems require. They also offer applications a host of advantages, from diagnostic features, for instance overtemperature, overvoltage and current sense/status, to cost savings on a system level. Browse our wide range of semiconductor offerings as well as application kits and support tools for brushless DC motors. See additional motor control applications here in Battery Powered Applications, Home & Building and Industrial Automation.

A brushless DC motor is a rotating electric machine with a classic three-phase stator like that of an induction motor. The rotor has surface-mounted permanent magnets. Polarity reversal is achieved by power transistors that switch in synch with the rotor position. Rectangular voltage strokes coupled with the given rotor position are what drive the brushless DC motor. The generated stator flux interacts with the rotor flux, which defines the torque and the motor's speed.

Key Characteristics

  • Commutation occurs on windings
  • High reliability: no brush wear
  • High efficiency
  • Low EMI
  • Medium construction complexity with multiple fields, delicate magnets
  • Driven by multi-phase inverter controllers

Example Application for Brushless DC Motor (integrated)

Example Application for Brushless DC Motor (discrete)