Motor Winding Mode Switching for Stable Torque and Power Output
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Solution Overview
Problem
Existing motor driving technologies face issues with torque controllability and output power management due to sudden changes in torque and unnecessary power limits when switching between closed-end and open-end winding modes, primarily focusing on reverse magnetic flux without considering torque requirements and inverter states.
Innovation Solution
A motor driving apparatus and method that determines driving modes based on both reverse magnetic flux and output power limits for each mode, using a controller to manage a mode change switch and multiple inverters, ensuring stable torque control and efficient power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mode switching is performed based only on reverse magnetic flux, then the motor can operate in different winding modes, but sudden torque changes occur due to difference in maximum output torque between modes
Solution Approach 1:
The patent changes the control parameters from only reverse magnetic flux to include both reverse magnetic flux and output power limit. By monitoring both parameters and determining switching points based on their combination, the system avoids sudden torque changes while maintaining mode switching capability. This is achieved by calculating the output power limit for each mode and using it together with reverse magnetic flux to determine when to switch between closed-end and open-end winding modes.
2Device complexity
If output power limit is collectively set for both inverters, then the control is simplified, but the output is affected even in the state of the driving element irrelevant to the corresponding mode
Solution Approach 1:
The patent segments the output power limit control into mode-specific limits. Instead of a single collective power limit, the system determines a first output power limit for closed-end winding mode and a second output power limit for open-end winding mode separately. This segmentation allows each inverter configuration to operate with its own optimized power limit, improving output efficiency without significantly increasing control complexity.
Solution Approach 2:
The patent implements dynamic adjustment of output power limits based on the operating mode. The controller dynamically switches between the first output power limit (for closed-end mode) and the second output power limit (for open-end mode) according to the current winding configuration. This dynamic approach ensures that the power limit is always appropriate for the active mode, preventing unnecessary restrictions on output while maintaining simplified control logic.
Data Source
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AI summary
A motor driving apparatus driving a motor including a plurality of windings corresponding to each of phases, includes a mode change switch and a plurality of inverters that operate the motor in a closed end winding mode or an open end winding mode; and a controller configured for controlling the mode change switch and the plurality of inverters according to a first mode determination result based on a reverse magnetic flux and a second mode determination result according to an output power limit for each mode.