Multi-Winding Motor Control for Torque Ripple Reduction
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Solution Overview
Problem
Multi-winding motors, particularly in Electronic Power-Steering Systems, face challenges in maintaining reliability due to torque ripple and noise caused by winding malfunctions, which existing technologies fail to adequately address.
Innovation Solution
A control apparatus and method that includes a current detector, abnormality determiner, compensation calculator, and signal output unit to detect and compensate for current imbalances and phase offsets in multiple windings, ensuring normal operation even when one winding malfunctions, by calculating and applying compensation currents and phase offsets to maintain desired torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-winding motor operates with all windings, then torque output and power density are improved, but reliability deteriorates when winding abnormalities occur causing torque ripple and noise
Solution Approach 1:
The control apparatus continuously monitors current in each winding and uses feedback signals to detect abnormalities. When a winding abnormality is detected, the system automatically adjusts control signals to compensate for the abnormality, maintaining reliable operation despite the fault condition
Solution Approach 2:
The system changes operating parameters dynamically by calculating compensation currents and phase offsets based on detected winding abnormalities. This allows the motor to adapt its current distribution and phase angles to maintain reliable torque output even when one or more windings are abnormal
2Object-affected harmful factors
If compensation control is applied to reduce torque ripple, then noise and vibration are reduced, but control complexity increases
Solution Approach 1:
The control apparatus performs self-diagnosis and self-compensation by automatically detecting winding abnormalities and calculating appropriate compensation currents without external intervention. This reduces the need for complex external control systems while effectively reducing torque ripple, noise, and vibration
3Reliability
If current monitoring and compensation calculation are implemented, then reliability under abnormal conditions is improved, but device complexity increases
Solution Approach 1:
The control apparatus integrates multiple functions into a single unified system: current detection, abnormality determination, compensation current calculation, and control signal generation. This multi-functional approach improves reliability under abnormal conditions while minimizing the addition of separate complex subsystems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces cogging torque and torque ripple, ensuring consistent steering torque and motor reliability even when windings are in abnormal states, thereby enhancing the performance and reliability of multi-winding motors in applications like Electronic Power-Steering Systems.
Implementation Method 1
a current detector configured to detect currents of a plurality of windings
Implementation Method 2
calculating a phase offset and/or a compensation current of each of the plurality of windings according to the determined abnormality
Implementation Method 3
outputting control signals to control at least one of the plurality of windings according to the phase offset and/or the compensation current
Data Source
AI summary
An apparatus for controlling a multi-winding motor may include: a current detector configured to detect currents of a plurality of windings, each of the windings associated with a corresponding rotor; an abnormal determiner configured to determine abnormality of at least one of the plurality of windings on the basis of the currents of the plurality of windings; a compensation calculation unit configured to calculate a current phase offset and/or compensation current of each of the plurality of windings according to the determined abnormality; and a signal output unit configured to output control signals to control at least one of the plurality of windings according to the current phase offset and/or the compensation current.