Sensored vs Sensorless Brushless DC Motors

Brushless DC (BLDC) motors are popular for their efficiency and reliability. This blog explores the differences between sensored and sensorless BLDC motors, highlighting their respective advantages, disadvantages, and best applications.

Sensored BLDC Motors


  1. Precise Control: Equipped with sensors like Hall effect sensors, these motors offer accurate rotor position detection, ensuring smooth operation at all speeds.
  2. Low-Speed Performance: Excellent for applications requiring precise control at low speeds, such as robotics and industrial automation.


  1. Complexity and Cost: The inclusion of sensors increases the motor's complexity and cost.
  2. Maintenance: Sensors can be susceptible to wear and environmental factors, potentially requiring more maintenance.

Sensorless BLDC Motors


  1. Simplified Design: Without sensors, these motors are less complex, reducing cost and increasing reliability.
  2. Durability: Fewer components mean fewer points of failure, enhancing durability and lifespan.


  1. Low-Speed Performance: Sensorless motors can struggle with precise control at very low speeds, making them less ideal for certain applications.
  2. Control Complexity: Advanced algorithms are needed to estimate rotor position, which can complicate the control system.

Best Applications

Sensored BLDC Motors:

  • Robotics
  • Industrial automation systems
  • Applications requiring precise low-speed control

Sensorless BLDC Motors:

  • Electric vehicles
  • Drones and UAVs
  • Household appliances
  • General-purpose applications where cost and reliability are critical


Choosing between sensored and sensorless BLDC motors depends on the specific requirements of the application. Sensored motors excel in precision and low-speed control but come with added complexity and cost. Sensorless motors offer a simpler, more durable solution at a lower cost but may not perform as well at low speeds. Understanding the strengths and weaknesses of each type will help in selecting the right motor for your needs.

How do Sensorless Brushless DC Motors work?