Synchronous Motor Drive Unit Flux Error Correction
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Solution Overview
Problem
Existing drive units for synchronous motors face complexity in magnetic flux operations and require detailed analyses under various load conditions to accurately calculate mutual inductance between axes, leading to inaccuracies in magnetic flux control.
Innovation Solution
A drive unit that includes a magnetic flux operation part calculating magnetic flux components based on current and field currents, and a magnetic flux operation error correcting part that corrects phase differences between input voltage and current to improve accuracy, using a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed magnetic flux analyses under various load conditions are performed to calculate mutual inductance, then accuracy of magnetic flux operations is improved, but device complexity and calculation complexity increase
Solution Approach 1:
The patent extracts and corrects only the specific error component (phase difference between input voltage and current) rather than performing complete detailed magnetic flux analyses. The magnetic flux operation error correcting part isolates and addresses the critical accuracy issue without requiring comprehensive analysis of all magnetic flux components under various load conditions.
Solution Approach 2:
The patent changes the approach from calculating mutual inductance parameters under various load conditions to measuring and correcting the phase difference parameter. This parameter substitution simplifies the problem by focusing on the critical phase difference between input voltage and current, which directly affects magnetic flux operation accuracy.
2Measurement precision
If detailed magnetic flux analyses are performed to grasp mutual inductance, then accuracy of magnetic flux operations is improved, but loss of time increases
Solution Approach 1:
The patent performs preliminary correction of the phase difference between input voltage and current before detailed magnetic flux operations. The magnetic flux operation error correcting part pre-adjusts the phase difference, eliminating the need for time-consuming detailed analyses under various load conditions to determine mutual inductance.
Solution Approach 2:
The patent replaces time-consuming detailed magnetic flux analyses with a faster parameter measurement approach. By measuring the phase difference between input voltage and current and using this to correct magnetic flux operations, the system achieves high accuracy without the time expenditure required for comprehensive load condition analyses.
Data Source
AI summary
Provided is drive unit of a synchronous motor capable of improving the accuracy of magnetic flux operations with a simple configuration. To this end, the drive unit has a magnetic flux operation part which, in the case where a direction of a magnetic field pole of the synchronous motor is regarded as a d-axis and a direction orthogonal to the d-axis is regarded as a q-axis, calculates a magnetic flux of the d-axis and a magnetic flux of the q-axis on the basis of a current of the d-axis, a current of the q-axis, and a field current of the synchronous motor; and a magnetic flux operation error correcting part which calculates a phase difference between an input voltage and an input current of the synchronous motor and corrects an inner-phase difference angle calculated from the magnetic flux of the d-axis and the magnetic flux of the q-axis on the basis of the phase difference.