Fan Motor Torque-Speed Control for Constant Output

The patent transforms the complex constant motor output control problem into a simpler constant air flow control problem by changing the control parameter from motor output to air flow. The control circuit calculates air flow based on rotation speed and torque, then controls the motor to maintain constant air flow, which indirectly achieves constant motor output control with simpler calculations.

The patent introduces air flow as an intermediary parameter between rotation speed and torque. Instead of directly controlling motor output using complex relationships between speed and torque, the system uses air flow as a mediator that simplifies the control calculation while still achieving the desired constant motor output effect.

The patent reduces manufacturing costs by changing the control approach from direct motor output control to constant air flow control. This parameter change allows the use of simpler control circuitry and calculations, reducing the need for expensive high-performance processors and complex control algorithms, thereby lowering overall manufacturing costs.

The patent employs a cost-effective control strategy that uses basic sensor data (rotation speed and torque) and simple calculations to achieve the control objective. This approach replaces expensive complex control systems with a more economical solution that uses readily available components and straightforward computation.