Brushless DC motors – find manufacturers and suppliers

Brushless DC motors (BLDC motors) are electric motors that use direct current (DC) as an energy source but, unlike conventional DC motors, do not use mechanical brushes for commutation.

Instead, they are controlled electronically using microcontrollers or special motor controllers.

Below you will find information on how brushless DC motors work, how they are controlled and regulated, their areas of application and their advantages:

How brushless DC motors work:

BLDC motors are electric motors that use direct current (DC) as an energy source but, unlike conventional DC motors, do not use mechanical brushes for commutation. Instead, they are controlled electronically using microcontrollers or special motor controllers.

A BLDC motor consists of the following main components:

1. Stator (fixed part):
   Contains copper coils that generate electromagnetic fields.
   Works in a similar way to the stator of a classic electric motor.
2. Rotor (rotating part):
   Consists of permanent magnets (e.g. neodymium magnets).
   Is set in motion by the magnetic fields of the stator.
3. Sensors (e.g. Hall sensors):
   Detect the position of the rotor and enable precise control.
4. Electronic control (inverter/driver):
   Sequentially switches the stator windings on and off.
   This generates a rotating magnetic field that drives the rotor.

Control & regulation of brushless DC motors:

1. Sensor-based control (Hall sensors):
   Measures the rotor position and enables precise control.
   Suitable for applications with high torque requirements.
2. Sensorless control:
   Utilizes electromagnetic feedback from the motor to determine position.
   Fewer components, but more complex electronics required.
3. PWM control (pulse width modulation):
   Controls the speed by changing the voltage or current flow.
   Efficient and flexible to use.
4. FOC (Field-Oriented Control):
   Advanced method for optimizing torque and energy consumption.
   Uses vector-based control for maximum efficiency.

Application of brushless DC motors:

Brushless DC motors are used in many industries:

1. Automotive industry:
As drive motors for e-bikes, e-scooters and electric cars.
To drive cooling systems and hydraulic pumps.
Lower energy consumption and higher reliability as a drive for power steering systems.

2. Aerospace:
Lightweight and efficient drives with high performance for drones and UAVs.
As aircraft actuators with lower weight and more precise control than hydraulic systems.

3. Robotics & industrial automation:
In CNC machines and industrial robots as precise control with high efficiency.
In conveyor belts and automation systems as a durable and low-maintenance drive.

4. Medical technology:
Ideal for driving electric prostheses and orthoses thanks to high precision and small size.
Medical devices such as pumps, scanners and surgical instruments can be driven precisely.

5. Household appliances:
Quiet and energy-efficient drive for vacuum cleaners and washing machines.
In fans and air conditioning systems for a long service life and better speed control.

6. Leisure and sports:
Lightweight, powerful motors with efficient control for e-bikes and pedelecs.
Electric skateboards and hoverboards can be driven with high torque power thanks to their compact design.

Advantages of brushless DC motors:

• Higher efficiency:
  Less energy loss due to lack of brushes.
  Less heat generation, which means less cooling is required.
• Longer service life:
  No mechanical wear due to brushes.
  Less maintenance required.
• Higher power density:
  Stronger torque and higher speeds than comparable brushed motors.
  Compact design enables smaller and lighter devices.
• Quiet operation:
  No brushes means no sparking or mechanical noise.
  Ideal for applications that require low noise levels (e.g. household appliances).
• Precise control:
  Very precise speed and torque control possible.
  Perfect for robotics, CNC machines or drones.

Brushless DC motors offer numerous advantages in terms of efficiency, durability and controllability. They are the preferred choice for modern applications that require precise control and high performance.

Here are the most important criteria to consider when buying brushless DC motors.

Buying brushless DC motors (BLDC motors) requires careful analysis of various technical, economic and application-specific criteria. The right choice can significantly improve the efficiency, performance and longevity of an application.

• Before a BLDC motor is procured, the specific requirements of the application must be precisely defined:
• Is the motor intended for industrial use to drive conveyor belts, pumps, CNC machines or robots?
• Are there high torque requirements and is continuous operation expected?
• Is the motor intended for use in the automotive industry and in e-mobility, for example in electric vehicles (e-bikes, e-scooters, drones)?
• High energy efficiency with a lightweight design is required here.
• In household appliances and medical technology, the motors should be low-noise and compact.
• The aerospace industry requires high power density and precision to drive drones and for satellite control.
• - High power density & precision
• Every application requires different motors. A powerful motor for an industrial application may not be ideal for a small e-bike.
• Determine the required power in watts or kilowatts, the motor efficiency (higher values save energy) and the power loss and thus the heat generation?
• What operating voltage is required? e.g. 12V, 24V, 48V, 400V? What is the maximum current consumption under load?
• What is the required starting torque and rated torque (Nm)?
• What is the maximum speed (rpm) for the application?
• Does the motor have to deliver high torque at low speed?
• Which control and sensor technology is optimal for the application?
• With or without Hall sensors? (Important for precise control)
• FOC (Field-Oriented Control) or PWM control?
• Is a connection to a control system required, e.g. CAN bus, RS485, I²C? or support for smart control systems or IoT applications?
• Is the motor optimized for battery systems (e.g. in electric vehicles)? Can it be easily connected to an existing power supply unit?
• Does the motor meet important industry standards such as SO 9001, CE, UL and certifications for safety-critical applications, e.g. medical, aviation?
• Carefully determine the price-performance ratio.
• Please note: A cheap motor can result in high maintenance costs in the long term. Quality pays off.
• A more expensive motor with higher efficiency can be cheaper in the long term than a cheap motor with high energy consumption**
• Check the warranty conditions and the service offered by the manufacturer or supplier.
• Make sure that spare parts are readily available in case repairs or maintenance are required.
• If necessary, check whether the motor can be modified or customized for specific requirements.
• A good supplier offers technical advice & support - not just a low price!

A well-chosen brushless DC motor offers high efficiency, long life and optimum performance for the desired application.

Brushless DC motors can be purchased from various suppliers. You will find comprehensive information on manufacturers and suppliers of Brushless DC motors around the world on Exportpages.