What is the BLDC motor? What is the difference between brushless and brushed motors.
What is a brushless motor?
Answer: A brushless motor refers to a
brushless DC motor composed of an electric motor, its main body, and a driver, which is a typical electromechanical integrated product.
Due to the self controlled operation of brushless DC motors, they do not require additional starting windings on the rotor like synchronous motors that start under heavy loads under variable frequency speed regulation, nor do they produce oscillations and loss of step during sudden load changes. The permanent magnets of small and medium-sized brushless DC motors now mostly use high energy product rare earth neodymium iron boron (Nd-Fe-B) materials. Therefore, the volume of rare earth permanent magnet brushless motors is reduced by one frame size compared to three-phase asynchronous motors of the same capacity.
What is the difference between brushless and brushed?
Answer: The difference between brushed motors and brushless motors is whether they are equipped with commonly used brush commutators. The commutation of brushed DC motors has always been achieved through the contact between graphite brushes and annular commutators installed on the rotor.
The brushless motor, on the other hand, feeds back the rotor position to the control circuit through a Hall sensor, allowing it to obtain the accurate time of motor phase reversal. Most brushless motor manufacturers produce motors with three Hall effect positioning sensors. Due to the absence of brushes and related interfaces, brushless motors are cleaner, produce less noise, require no maintenance, and have a longer lifespan.
How to distinguish between brushless and brushed?
Answer: There are 8 cores for brushless motor wires and 2 cores for brushed motor wires.
