In order to solve the above technical problems, the invention provides a control system of a brushless DC motor, which is low in cost and simple and effective in detection mode. The invention provides a low-cost control system for a brushless DC motor. The control system includes a power supply, a driving module, a detection module, a control module and an intelligent terminal. The detection module has a current detection submodule and a back EMF detection submodule.
The first variable information includes the current of the brushless DC motor, and the second variable information includes a back EMF zero-crossing signal of the brushless DC motor. The invention can accurately detect the position of the rotor in any working state of the brushless motor. It does not need to install a Hall element, making the cost low and the detection mode simple and effective. When the brushless DC motor starts, the current is detected by the current detection submodule.
The rotor position is obtained through the detected current, and the brushless DC motor is driven to run. When the brushless DC motor is completely started, it is continuously driven to run through the current detection submodule.
