Technical Support

About the Brushless DC Motors

Brushless motors have been developing rapidly in recent years. With advantages like high efficiency, low noise, long lifespan, high reliability, and precise control, they are widely used in industrial automation, home appliances, electric vehicles, medical and aerospace fields. As technology matures and costs decline, they will penetrate more areas, replacing traditional asynchronous motors, with a very promising future.

What are brushless DC motors?

Brushless DC motors, or "BLDC motors," are synchronous electric motors powered by DC (direct current) voltage. They are electronically commutated without brushes, hence the name "brushless motors." Brushless DC motors consist of a fixed armature along with permanent magnets which rotate, hall sensors, stator windings, rotor magnet North and South, Hall sensor magnets, an accessory shaft, and a driving end of the shaft.

How do brushless DC motors work?

Brushless DC motors have an electronic commutation system, no brushes, and no mechanical commutators. This allows brushless electric motors to operate at higher speeds than their brushed counterparts. There can also be a different number of poles on the stator for each motor.

Difference brush DC motor and a brushless DC motor?

Brush (or "brushed") DC motors use commutation brushes to periodically change current direction for torque. However, brush wear means they need more maintenance and have a shorter lifespan than brushless DC motors. BLDC motors use hall sensors at the motor's back end. These sensors output high - low pulses when detecting magnetic field changes, so BLDC motors need more complex controllers like VSDs. Without commutation brushes, BLDC motors are far more efficient, require little maintenance, and have a longer life than brushed DC motors.

How Select A Brushless Motor

These questions will help to narrow down your selection. You will then need to determine all specifications, known ones along with possible ones. For example, do you need a specific frame size, weight, power, speed, length, etc.? Each motor listed will offer specifications inherent to that particular model, such as rated voltage, rated torque, torque constant, back EMF constant, and rated power which all related to the appropriate driver. Select a driver based on the rated power, rated voltage, and the current required to run your motor given your application requirements. Keep in mind there are many different motors and driver/controllers to choose from. If you require assistance with making a selection, our applications engineers will be happy to assist you.

Mounting

For BLDC motor installation, ensure proper wiring. Mount on a stable, shock - free surface. Consider heat dissipation. Keep controllers 10mm from other devices, ground system, and protect from noise.

Hall Sensor Feedback

Hall sensors provide feedback when the stator windings of a brushless DC motor are energized. The controller needs rotor position info from these sensors, which are in the back - end cap.

Brushless Motor Life Cycle

Brushless motors differ from predecessors in commutation, using electric methods. They're cost - effective but lifespan can be affected. Bearing failure, lack of proper lubrication (avoid non - approved ones), and high temperature harm them. Cooling methods can lower temps at high loads. Consider these in design and installation.