Magnet Motor Power Conversion Control Without Rotary Auto-Tuning
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Solution Overview
Problem
Existing control methods for magnet motors require rotary auto-tuning to achieve accurate estimation of the induced voltage coefficient, which increases working time and is inefficient.
Innovation Solution
A power conversion device that estimates the induced voltage coefficient using active or reactive power during actual motor operation, eliminating the need for rotary auto-tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotary auto-tuning is performed to adjust the induced voltage coefficient, then the control accuracy is improved, but the working time increases
Solution Approach 1:
The system performs self-adjustment by automatically estimating and correcting the induced voltage coefficient during normal operation using measured active power and reactive power, without requiring external rotary auto-tuning operations. The control device itself gathers necessary data and performs the adjustment internally.
Solution Approach 2:
The induced voltage coefficient is estimated and corrected in advance during normal operation before actual control tasks require high precision. The system proactively adjusts the coefficient using measured power values, so that accurate control parameters are ready when needed.
2Measurement precision
If rotary auto-tuning is performed to adjust the induced voltage coefficient, then the control accuracy is improved, but the operational efficiency decreases
Solution Approach 1:
The control device autonomously estimates the induced voltage coefficient by measuring active power and reactive power during normal operation, eliminating the need for separate rotary auto-tuning procedures. This self-service approach maintains high operational efficiency while achieving accurate parameter estimation.
Solution Approach 2:
The estimation and adjustment of the induced voltage coefficient occurs continuously during normal motor operation rather than requiring a separate tuning phase. The system continuously uses measured power values to maintain accurate control parameters without interrupting productive work.
3Measurement precision
If the induced voltage coefficient is estimated using traditional methods, then the estimation accuracy is degraded by inductance setting errors, but the method is simpler
Solution Approach 1:
Active power and reactive power measurements serve as intermediary variables that connect the electrical parameters to the induced voltage coefficient estimation. By using these power measurements as mediators, the system avoids direct dependence on potentially inaccurate inductance setting values while achieving accurate coefficient estimation.
Solution Approach 2:
The estimation method changes from relying on inductance parameters (Ld, Lq) to relying on power parameters (active power P and reactive power Q). This parameter substitution eliminates the sensitivity to inductance setting errors while maintaining estimation accuracy through measured electrical quantities.
Data Source
AI summary
The present invention achieves highly accurate control characteristics by estimating an induced voltage coefficient of a magnet motor without rotary auto-tuning. A first power Pc is calculated on the basis of the output voltage and output current of the magnet motor, and a second power P{circumflex over ( )} is calculated on the basis of the electric circuit constant, current command, output frequency, and induced voltage coefficient of the magnet motor. The induced voltage coefficient is estimated so that the calculated first power follows the second power, and the driving of the magnet motor is controlled in accordance with the induced voltage coefficient.