The number of applications for brushless DC motors is wide and includes home appliances such as household vacuum cleaners, blenders, hair dryers, cameras, and fans to list a few. These motors also find application in electric vehicles, namely low-power electric vehicle motor controllers and motor control protection systems. They are also used in medical equipment, electronic beds for example, as well as sporting equipment such as AEG (Automatic Electric Gun).
The advantages of the traditional brush motor are in their low cost and that they don't have an IC control circuit drive. The disadvantages, however, outweigh the advantages in comparison with brushless motors. The common original brush motor is a mechanical conversion operation, which needs to be driven by brush contact. The brush has high impedance and large current loss. The resultant continuous contact friction generates high heat. Thus, the output efficiency of the motor is low, the temperature is high, and the product life short. These motors, moreover, do not have the function of battery protection and locked-rotor protection. Due to the friction brushes also generate dust over time which can burst into flames in what is a high temperature environment. Overcoming this problem requires regular cleaning which adds a lot to maintenance costs over time.
Brushless motors have many advantages over traditional brush motors. They are safer and more reliable. Because the mechanical loss of the brushless motor is controlled by the high-speed computing CPU and IC circuit, the motor operation is precisely regulated, and its output and conversion efficiency are very high, which is more than twice that of the brush motor.
