Motor Stator Preheating With Closed-Loop Power Braking Control

The patent implements a feedback mechanism where the power control module continuously monitors the power error between the power command and actual output power, then dynamically adjusts the current braking command to correct deviations. This closed-loop feedback system maintains measurement accuracy without complicating operation, as the adjustment occurs automatically based on real-time power error detection.

The patent changes the parameter being controlled from a fixed preset current command to a dynamically adjustable current braking command that varies based on power error. By modifying this key parameter, the system achieves accurate output power measurement while maintaining ease of operation, as the parameter adjustment is performed automatically by the control module rather than requiring manual intervention.

The patent applies the self-service principle by enabling the power control module to calculate and measure output power using existing system components (current sensor, voltage command, and control algorithms). The system serves its own measurement needs without requiring external power measurement equipment, thereby maintaining high measurement accuracy while avoiding increased device complexity and additional hardware costs.

The patent makes the power control module multi-functional by enabling it to perform both power command issuance and output power measurement/calculation using the same hardware resources. The current sensor and control module serve dual purposes: controlling motor operation and measuring output power accuracy, thus eliminating the need for separate measurement equipment and reducing overall system complexity.

The patent implements continuous power measurement and adjustment during normal preheating operation, eliminating the need for separate calibration procedures. The power control module continuously calculates output power and adjusts the current braking command in real-time based on power error, maintaining accurate measurements without interrupting the preheating process or requiring additional calibration time.

The patent uses the power error calculation as an intermediary mechanism to bridge the gap between power command and actual output power. By introducing this intermediate calculation step that compares commanded power with measured power, the system achieves accurate calibration without requiring external measurement devices or time-consuming calibration procedures, as the power error itself guides the adjustment process.