Asynchronous Motor Rotor Thermal Modeling for Overload Protection

The patent applies dynamics by transitioning from a static adiabatic thermal model to a dynamic thermal model that accounts for heat exchange between rotor and stator. The thermal model dynamically adjusts based on operational parameters including heat transfer coefficients and thermal capacities, allowing accurate representation of transient thermal processes during motor startup, operation, and shutdown.

The patent implements parameter changes by introducing variable thermal parameters including heat transfer coefficient (k), thermal capacity (C), and thermal time constant (τ). These parameters are adjusted based on motor operating conditions, enabling the model to adapt to different thermal states and accurately calculate rotor thermal levels under varying load and speed conditions.

The patent applies segmentation by dividing the motor operation into three distinct states: startup state, running state, and shutdown state. Each state has its own specific thermal model and calculation formula, allowing precise thermal level determination tailored to the characteristics of each operational phase. This segmented approach accurately captures the different thermal behaviors during motor acceleration, steady-state operation, and deceleration.

The patent implements dynamics by creating a state-dependent thermal modeling system that dynamically selects appropriate thermal models based on motor operating conditions. The system transitions between different thermal calculation approaches depending on whether the motor is starting, running, or shutting down, ensuring optimal accuracy for each operational phase.