PMSM Torque Ripple Compensation Using Short-Circuit Measurement
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Solution Overview
Problem
Existing motor control systems struggle to efficiently compensate for torque ripples caused by manufacturing variations in permanent magnet synchronous motors, leading to increased production time and costs due to the need for numerical analysis and tuning on each motor.
Innovation Solution
A motor control device and method that calculates an input current based on a torque ripple-compensated target torque using a compensation factor, determined by measuring torque ripple information in a state where each phase of the motor is electrically shorted, and generates a control signal to minimize torque ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If numerical analysis and tuning are applied to each motor in the production line to compensate for torque ripple, then manufacturing precision is improved, but productivity deteriorates due to increased time consumption
Solution Approach 1:
The patent applies preliminary action by pre-calculating torque ripple compensation values during the motor design phase and storing them in a lookup table. During production, the control device simply retrieves the pre-calculated compensation values based on measured motor parameters, eliminating the need for time-consuming numerical analysis and tuning of each individual motor while maintaining compensation precision
Solution Approach 2:
The patent uses copying by creating a simplified model or lookup table that replicates the results of complex numerical analysis. Instead of performing full numerical analysis on each motor, the system copies the essential compensation characteristics into a pre-computed table that can be quickly referenced during production, significantly reducing processing time while preserving compensation effectiveness
2Manufacturing precision
If numerical analysis and tuning are performed on each motor to reflect manufacturing variation, then manufacturing precision is improved, but loss of time increases due to extended testing and tuning duration
Solution Approach 1:
The patent performs the complex numerical analysis and tuning work in advance during the design phase, storing the results in a pre-computed compensation table. During actual production and testing, the system only needs to measure basic motor parameters and retrieve the corresponding compensation values from the table, reducing the time required from hours to minutes per motor while maintaining individual compensation accuracy
Solution Approach 2:
The patent changes the approach from performing complex iterative tuning procedures to using a pre-computed lookup table based on key motor parameters. By transforming the compensation method from a time-intensive process to a parameter-based retrieval system, the patent significantly reduces testing and tuning time while preserving the ability to reflect individual motor manufacturing variations
Data Source
AI summary
The embodiment relates to a motor control device and method and provide a motor control device and method capable of compensating for torque ripples generated due to the manufacturing variation in the motor. In particular, there may be provided a motor control device and method capable of compensating for torque ripple by applying a compensation factor calculated from torque ripple information measured in a state in which three phases of the motor is electrically shorted to control current based on the torque ripple-compensated target torque.