What is brushless dc motor
Brushless DC Motor is much smaller in weight and volume than brushed DC motors, the corresponding moment of inertia can be reduced by 40% to 50%. STEPPERONLINE Brushless DC Motor has large output with light weight. Brushless DC Motor eliminates the carbon brush and slip ring structure, so it can run at low speed and high power. In addition, Brushless DC Motor has excellent torque characteristics, good medium and low speed torque performance, large starting torque and small starting current. Brushless DC Motor has soft start soft stop, good braking characteristics, so it will save the original mechanical brake or electromagnetic brake device. BLDC motors have fixed permanent magnets, which rotate and a fixed armature, eliminating the problems of connecting current to the moving armature. And possibly more poles on the rotor than the stator or reluctance motors. The latter may be without permanent magnets, just poles that are induced on the rotor then pulled into arrangement by timed stator windings. An electronic controller replaces the brush/commutator assembly of the brushed DC motor, which continually switches the phase to the windings to keep the motor turning. The controller performs comparative timed power distribution by using a solid-state circuit instead of the brush/commutator system. Brushless DC Motor has high efficiency, the motor itself has no excitation loss and carbon brush loss, eliminating multi-stage deceleration, the overall power saving rate can reach 20% ~ 60%. The speed control of BLDC motor is essential for making the motor work at desired rate. The speed of a brushless dc motor can be controlled by controlling the input dc voltage. The higher the voltage, more is the speed. When motor works in normal mode or runs below rated speed, input voltage of armature is changed through PWM model. When the brushless dc motor is operated above rated speed, the flux is weakened by means of advancing the exiting current. https://www.stepperonline.ru/