Synchronous Motor Startup Phase Correction Using Rotor Phase Detection
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Solution Overview
Problem
Existing drive systems for synchronous motors face challenges in accurately assigning the phase at startup due to errors in the initial magnetic pole position, which can prevent successful motor operation.
Innovation Solution
A drive system incorporating a rotor phase detection unit, phase estimation unit, and phase error adjustment unit to correct phase errors by generating a correction amount for the initial magnetic pole position, allowing for precise phase control during startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase control is performed using initial magnetic pole position at startup, then motor startup control is enabled, but phase assignment accuracy deteriorates when initial magnetic pole position contains errors
Solution Approach 1:
The system performs preliminary phase error correction by detecting the actual rotor phase and comparing it with the initial magnetic pole position before executing the startup control. This preliminary detection and correction action ensures that phase assignment accuracy is improved while maintaining startup reliability, resolving the technical contradiction between these two parameters
2Measurement precision
If correction amount is generated to adjust phase error, then phase assignment accuracy is improved, but control system complexity increases
Solution Approach 1:
The system implements feedback by detecting the actual rotor phase position and using this information to generate a correction amount that adjusts the initial magnetic pole position. This feedback mechanism improves phase assignment accuracy while maintaining relatively simple control logic, as the correction is generated automatically based on the detected phase error without requiring complex control algorithms
Solution Approach 2:
The system changes the parameter of the initial magnetic pole position by adding a correction amount to it, based on the detected phase error. This parameter adjustment approach improves phase assignment accuracy while keeping the control system simple, as it only requires adding a correction value to the existing initial position parameter rather than implementing complex control structures
Data Source
AI summary
A drive system according to an aspect of an embodiment includes a rotor phase detection unit, a phase estimation unit, a phase error adjustment unit, and a drive control unit. The rotor phase detection unit detects a phase of a rotor of a synchronous motor and outputs phase information indicating the detected phase. The phase estimation unit generates an initial phase command of defining a position of the rotor of the synchronous motor by using a correction amount for correcting a phase error. The phase error adjustment unit generates the correction amount for adjusting a phase error of an initial magnetic pole position of the synchronous motor by using a phase error of the initial phase command at a timing defined by the phase information. The drive control unit controls the driving of the synchronous motor by using the initial phase command obtained by adjusting the phase error.