Rotor Position Deviation Measurement in Permanent Magnet Synchronous Motors
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Solution Overview
Problem
Existing methods for measuring rotor position deviation in permanent magnet synchronous motors are inefficient and inflexible due to the need for additional equipment like mechanical brakes and reliance on precise motor parameters, leading to calculation complexity and reduced accuracy.
Innovation Solution
An apparatus comprising a control unit, power transformation unit, rotor position estimator, and calculation unit that transforms d-axis DC and q-axis AC voltage signals into three-phase command signals, allowing for estimation of rotor position deviation without external locking devices, using high-frequency signals to simulate saturation states and generate compensation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic field analysis method is used to measure rotor position deviation, then measurement accuracy is improved, but device complexity increases due to requirement of additional equipment such as mechanical internal contracting brake apparatus
Solution Approach 1:
The patent extracts the measurement function from a complex electromagnetic field analysis system with additional mechanical equipment, and integrates it into the existing motor control system using only the motor's own components and control units. This removes the need for mechanical internal contracting brake apparatus while maintaining measurement capability.
Solution Approach 2:
The control unit is designed to perform multiple functions: it controls the power transformation unit for motor operation and simultaneously measures rotor position deviation by processing feedback signals. This multi-functionality eliminates the need for separate dedicated measurement equipment.
2Measurement precision
If electromagnetic field analysis method is used to measure rotor position deviation, then measurement accuracy is improved, but ease of operation deteriorates due to large amount of calculation and dependence on precise motor parameters
Solution Approach 1:
The patent uses feedback from the motor's own operation (phase currents and voltages) to measure rotor position deviation. The control unit receives feedback signals from the motor during normal operation and calculates position deviation directly from these signals, eliminating the need for separate electromagnetic field analysis calculations and precise motor parameters.
Solution Approach 2:
The motor system measures its own rotor position deviation using its own operational parameters (phase currents, voltages, and control signals). The control unit processes the motor's self-generated feedback signals, making the system self-sufficient without external measurement equipment or complex parameter-dependent calculations.
3Measurement precision
If actual measurement method is used to measure rotor position deviation, then measurement accuracy is improved, but productivity deteriorates due to inconvenience for utilization and poor efficiency in actual operation
Solution Approach 1:
The patent enables continuous measurement of rotor position deviation during normal motor operation without interruption. The control unit continuously receives feedback signals and calculates position deviation in real-time, eliminating the need to stop the motor for measurement and maintaining continuous productive operation.
Solution Approach 2:
The motor system performs self-measurement during operation, eliminating the need for external measurement equipment and operators. The control unit automatically processes feedback signals and generates position deviation information, making the measurement process as automatic and efficient as the motor operation itself.
Data Source
AI summary
An apparatus for measuring a position deviation of a rotor of a permanent magnet synchronous motor includes a control unit, a power transformation unit, a rotor position estimator and a calculation unit. The control unit receives a d-axis DC voltage signal and a q-axis AC voltage signal and receives an initial value of the rotor position and a high-frequency signal to output a three-phase command signal. The power transformation unit receives the three-phase command signal and outputs a three-phase control signal for controlling the motor. The rotor position estimator receives a three-phase current feedback signal corresponding to an operation of the motor and generates an estimation value of the rotor position. The calculation unit performs calculation to the initial value and the estimation value to generate a deviation value of the rotor position. Moreover, a method for measuring the position deviation is also disclosed herein.