Double-Wound Motor Control for Torque Ripple Under Faults
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Solution Overview
Problem
Conventional control apparatuses for double wound motors require additional hardware and complex configurations to reduce torque ripple, which increases the likelihood of failures, costs, and space requirements, while they can only block torque ripple caused by inverter abnormalities, not winding abnormalities.
Innovation Solution
A control apparatus and method for a double wound motor that uses a gate driver to detect switch and winding abnormalities and a motor control unit to output current commands that attenuate torque ripple patterns, minimizing hardware additions and simplifying the circuit by pre-storing torque ripple information and performing current control based on detected abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional switching circuits (block switches) are added to block torque ripple, then torque ripple blocking capability is improved, but device complexity and failure probability increase
Solution Approach 1:
The patent extracts and removes the additional block switching circuits from the system. Instead of adding S11-S13 and S21-S23 block switches, the invention uses the existing inverter switches SW11-SW16 and SW21-SW26 to achieve torque ripple blocking by controlling them to remain in the off state during abnormal conditions, thereby eliminating the need for separate blocking circuits.
Solution Approach 2:
The existing inverter switches are made multi-functional by using them for both normal motor operation and torque ripple blocking. The same switches (SW11-SW16, SW21-SW26) that drive the motor windings are also used to block torque ripple currents when abnormalities occur, eliminating the need for dedicated blocking switches.
2Reliability
If block switches are added for each phase, then torque ripple blocking is improved, but manufacturing cost increases
Solution Approach 1:
The existing inverter switches are made multi-functional by using them for both normal motor operation and torque ripple blocking. The same switches (SW11-SW16, SW21-SW26) that drive the motor windings are also used to block torque ripple currents when abnormalities occur, eliminating the need for dedicated blocking switches.
3Reliability
If additional hardware is added to reduce torque ripple, then torque ripple reduction is improved, but space requirements increase
Solution Approach 1:
The patent extracts and removes the additional block switching circuits from the system. Instead of adding S11-S13 and S21-S23 block switches, the invention uses the existing inverter switches SW11-SW16 and SW21-SW26 to achieve torque ripple blocking by controlling them to remain in the off state during abnormal conditions, thereby eliminating the need for separate blocking circuits.
Data Source
AI summary
The present disclosure relates to a double wound motor and a control method therefor, and comprises: a first inverter and a second inverter for supplying phase currents respectively to a first winding unit and a second winding unit of the double wound motor; a gate driver for driving switches respectively included in the first inverter and second inverter and detecting whether there is a switch abnormality in the first inverter or second inverter and whether there is a winding abnormality in the first winding unit and second winding unit; and a motor control unit for outputting a current command to attenuate a torque ripple in response to a torque ripple pattern according to the switch or winding abnormality.