Toy Helicopter Rotor Speed Feedback Control

The patent implements a feedback control system that continuously monitors rotor speed and adjusts power delivery to the second rotor to maintain torque balance. The microprocessor receives feedback from the rotor speed sensor and dynamically modifies PWM signals to the motor controller, creating a closed-loop system that automatically compensates for torque imbalances without requiring complex mechanical additions.

The patent replaces complex mechanical solutions (such as mechanically linking rotors or using complex gear systems) with an electronic control system. By using a microprocessor-based feedback loop that adjusts electrical power delivery to motors, the system achieves torque balancing through electronic means rather than mechanical constraints, thereby reducing overall device complexity.

The patent implements a self-calibrating system where the microprocessor automatically determines the correct power distribution to each rotor based on real-time speed feedback. The system performs its own calibration by monitoring rotor speeds and automatically adjusting PWM duty cycles to achieve balanced torque, eliminating the need for manual calibration procedures and making the helicopter easy to operate immediately out of the box.

The patent transitions from static calibration (fixed power distribution settings) to dynamic calibration (real-time power adjustment based on operating conditions). The feedback control system continuously adapts power delivery to each rotor based on current speed measurements, allowing the helicopter to maintain optimal maneuverability across varying flight conditions without requiring manual recalibration.