Rotary Electric Machine Pre-Magnetization Feedback Control

The patent uses feedback by measuring the actual current in the rotor winding and using this measurement to determine when to initiate stator excitation. The control system continuously monitors the electrical quantity (current or voltage) and adjusts the timing of rotating magnetic field generation based on real-time feedback, ensuring optimal pre-magnetization timing that adapts to actual system conditions rather than relying on fixed predetermined delays.

The patent transforms the static predetermined delay approach into a dynamic timing system that adapts to variable voltage conditions. By measuring electrical quantities in real-time and adjusting the pre-magnetization duration based on actual current or voltage levels, the system dynamically optimizes the excitation timing to match the specific electrical conditions encountered during operation.

The control system incorporates feedback mechanisms that measure electrical quantities (current or voltage) during pre-magnetization and use these measurements to determine the optimal timing for initiating rotating magnetic field generation. This feedback-based approach enables the system to adapt to variable voltage conditions while maintaining relatively simple control logic that responds to actual system state rather than requiring complex predictive models.

The system performs self-adjustment by using its own electrical measurements to control its own excitation timing. The control unit monitors the electrical quantity within the rotor circuit and automatically determines when sufficient magnetization has been achieved, eliminating the need for external intervention or complex timing calculations and enabling the system to self-optimize based on its actual operating conditions.