Enhanced Torque Control for Motor Generators via Dual-Mode Switching
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Summary
Problems
Existing motor generator drive control devices face limitations in increasing torque output due to constraints on switching element current, which restricts the ability to achieve high torque production.
Innovation solutions
A drive control device and method that switches between two control modes to manage the switching element's current, allowing a higher current limit by reducing the number of switching pulses and extending the on-period in the second mode, while maintaining a lower DC output voltage, thereby increasing torque output.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the current limit value for the switching element is increased to produce high torque, then the torque output is improved, but the switching element overheats due to excessive current
Why choose this principle:
The patent applies periodic action by switching between two control modes (first control mode with PWM and second control mode with reduced switching frequency) based on torque requirements. When high torque is needed, the system transitions to the second control mode where the switching element operates with fewer switching cycles, allowing higher current to flow during active periods while reducing overall heat generation through less frequent switching.
Principle concept:
If the current limit value for the switching element is increased to produce high torque, then the torque output is improved, but the switching element overheats due to excessive current
Why choose this principle:
The patent implements dynamics by making the control mode adjustable and switchable based on real-time torque command values. The system dynamically transitions between the first control mode (lower current limit, higher switching frequency) and the second control mode (higher current limit, lower switching frequency) to optimize both torque output and thermal management of the switching element.
Application Domain
Data Source
AI summary:
A drive control device and method that switches between two control modes to manage the switching element's current, allowing a higher current limit by reducing the number of switching pulses and extending the on-period in the second mode, while maintaining a lower DC output voltage, thereby increasing torque output.
Abstract
Provided is a drive control device including: a DC voltage source; an inverter configured to switch a switching element, to thereby apply a drive voltage to a rotary electric machine to cause a drive current to flow through the rotary electric machine; and a control unit configured to: control an output voltage of the DC voltage source; and perform control of causing, based on a torque command value for the rotary electric machine, a drive current to flow through the switching element in a first control mode, in which a drive current having a value equal to or smaller than a first current limit value is caused to flow, and a second control mode, in which a drive current having a value larger than the first current limit value is caused to flow.