Synchronous Motor Magnetic Pole Position Detection Abnormality
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Solution Overview
Problem
Synchronous motors face control issues and torque generation problems due to positional displacement of the rotational position detector over time or during installation, leading to inaccurate magnetic pole position detection.
Innovation Solution
A magnetic pole position detecting device and method that includes a storage unit for a reference magnetic pole position, a detector to assess the current magnetic pole position, and a determination unit to compare the two, determining abnormality when the difference exceeds a predetermined range, thereby preventing improper operation and alerting the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotational position detector is mounted on the synchronous motor, then the magnetic pole position can be detected, but the mounting position may shift or deviate over time causing detection abnormality
Solution Approach 1:
The patent stores a reference magnetic pole position value before operation begins. This preliminary action establishes a baseline for comparison that remains valid even if the detector mounting position shifts during operation, allowing the system to detect abnormalities without requiring continuous recalibration.
Solution Approach 2:
The determination unit continuously compares the currently detected magnetic pole position with the stored reference value. When the difference exceeds a predetermined threshold, the system identifies detection abnormality. This feedback mechanism enables real-time monitoring of detector reliability without adding complex hardware.
2Reliability
If the magnetic pole position is continuously monitored to detect mounting position shifts, then detection abnormality can be identified, but the system complexity increases
Solution Approach 1:
Instead of adding complex real-time monitoring hardware, the patent creates a virtual copy of the reference magnetic pole position value stored in memory. The determination unit simply compares current readings against this stored copy, achieving reliable abnormality detection through software-based comparison rather than additional physical sensors or complex circuitry.
Data Source
AI summary
A magnetic pole position detecting device for a synchronous motor includes: a storage unit for storing a reference magnetic pole position of the synchronous motor as a predetermined reference; a magnetic pole position detector for detecting the magnetic pole position of the synchronous motor when a predetermined condition is satisfied; and a determination unit for comparing the reference magnetic pole position stored in the storage unit with the magnetic pole position detected by the magnetic pole position detector to determine that detection of the magnetic pole position is abnormal when the difference between the two falls out of a predetermined range.