Why choose a brushless DC motor?
1. DC brushed motor has fast response speed and high starting torque
DC brushed motors have fast starting response speed, high starting torque, smooth speed change, and almost no vibration from zero to maximum speed. They can drive larger loads during starting. Brushless motors have high starting resistance (inductance), so the power factor is small, the starting torque is relatively small, there is a buzzing sound and strong vibration during starting, and the load driven during starting is small.
2. DC brushed motor runs smoothly and has good starting and braking effects
Brushed motors are regulated by voltage and speed, so they start and brake smoothly, and also run smoothly at constant speed. Brushless motors are usually controlled by digital frequency conversion, which first converts AC to DC and then DC to AC, and controls the speed through frequency changes. Therefore, brushless motors operate unstably and vibrate greatly during starting and braking, and only stabilize when the speed is constant.
3. DC brushed motor has high control accuracy
DC brushed motors are usually used together with gearboxes and decoders to increase the output power of the motor and improve control accuracy. The control accuracy can reach 0.01 millimeters, allowing moving parts to stop almost anywhere they want. All precision machine tools use DC motors to control accuracy. Due to the instability during start-up and braking, the moving parts of a brushless motor will stop at different positions every time, and must be stopped at the desired position through positioning pins or limiters.
