Shenzhen Kinmore Motor Co., Ltd.
Brushless motor control solutions require specific control devices to realize their functions. When selecting an appropriate control scheme, consider not only performance requirements, but also cost and system complexity. In the control scheme of brushless DC motor, the three most common methods are: Trapezoidal，Sinusoidal and Field Oriented Control (FOC）.
| Control Method | Principle | Advantages | Disadvantages | Key Components |
| Trapezoidal | The motor windings are excited sequentially, with each excitation of two phases producing a square wave current. | Simple structure and low cost; suitable for cost-sensitive applications. | Torque fluctuation, noise; poor running smoothness. | Electronic speed controller (ESC), Microcontroller unit (MCU), Hall sensors |
| Sinusoidal | The motor phase current is accurately adjusted and changes according to the sinusoidal waveform to provide smooth rotation. | Smooth operation, low noise; medium cost, improved performance. | The control algorithm and hardware requirements are more complex than Trapezoidal control. | Digital signal processor (DSP), high-performance MCU, Current sensors |
| FOC | The motor current is decomposed into two components, magnetic flux and torque, and controlled separately to achieve precise torque and speed control. | High efficiency; optimal running smoothness and dynamic response; precise control of speed and torque. | The implementation is complex and the cost is high; it requires high computing power of the controller. | High-performance digital signal processors (DSPs), current and position sensors, power electronic modules |
