Brushless dc motor is widely applied in many fields and the three types of its applications are in the following. The first is the continuous loading application, which mainly requests steady speed but the speed accuracy is not highly emphasized in this situation.
Examples as pumps, fans, blowers and other application types are with low costs and more for the open-loop control. The second is the application of variable load, which mainly requires the speed change within a certain range and has higher demand of the rotational speed of the motor characteristics and dynamic response time.
Drying machine and compressor in the household appliances and pump control, electric controller and engine control in the automobile industry are very good examples. The cost of the system of this kind of application is relatively higher.
The third is the location application. Most of the industrial control and automation applications fall into this category. Such applications tend to deliver the energy, so dynamic response of the speed,the controller and the torque are specially required.