IPM Motor Inductance Detection Using Anti-Windup Feedback
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Solution Overview
Problem
Inaccurate motor parameters, particularly inductance, lead to torque ripple and noise in IPM synchronous motors, especially in weak magnetic flux control sections.
Innovation Solution
An apparatus and method using anti-windup feedforward to detect abnormal inductance in IPM synchronous motors by comparing control inductance with actual inductance through error values derived from anti-windup q-axis and d-axis voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor parameter (inductance) is inaccurate, then torque control performance deteriorates, but torque ripple and noise occur
Solution Approach 1:
The patent implements a feedback mechanism by calculating an error value from the difference between anti-windup q-axis voltage and anti-windup d-axis voltage, then using this feedback to detect and correct inductance parameter abnormalities, thereby improving torque control performance and eliminating torque ripple and noise
Solution Approach 2:
The patent replaces traditional mechanical parameter measurement methods with an electrical field-based detection method, using voltage signals from the motor's d-axis and q-axis to calculate inductance parameters, achieving more precise and dynamic parameter detection
2Manufacturing precision
If control inductance differs from actual inductance, then motor performance deteriorates, but detection complexity increases
Solution Approach 1:
The patent enables the motor control system to self-diagnose inductance parameter abnormalities using its own operating voltage signals (anti-windup d-axis and q-axis voltages), eliminating the need for external detection equipment and keeping the detection system simple while achieving high precision
Solution Approach 2:
The patent makes the motor control system multi-functional by enabling it to perform both motor control and inductance parameter detection using the same voltage signals and control circuitry, thereby avoiding additional detection devices and reducing overall system complexity
Data Source
AI summary
Disclosed are an apparatus and a method for detecting the abnormal inductance of the IPM synchronous motor, in which since it may be confirmed whether a motor parameter used for controlling a current IPM synchronous motor is normal by using anti-windup feedforward, it is possible to set a more accurate motor parameter, so maximum performance of the IPM synchronous motor can be shown and a torque ripple and noise generated by an inaccurate motor parameter can be prevented.