Synchronous Machine Control via Adjustable High-Frequency Voltage
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Solution Overview
Problem
Conventional synchronous rotating machine control methods face challenges in accurately setting the amplitude and frequency of high-frequency voltage, leading to increased driving noise and position errors.
Innovation Solution
A control device that generates a first command value for driving voltage and acquires a second command value for high-frequency voltage from storage, superimposing it to output a third command value, allowing for estimation of the rotational position based on high-frequency current, with user input and storage of multiple parameter values for amplitude and frequency adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sensorless control method is used to estimate magnetic pole position, then sensor fault tolerance is improved, but driving noise increases and position accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by allowing users to adjust the amplitude and frequency parameters of the high-frequency voltage applied to the synchronous rotating machine. By optimizing these parameters, the system achieves accurate magnetic pole position estimation while minimizing driving noise and maintaining reliability in sensorless operation.
2Ease of repair
If conventional sensorless control method is used to estimate magnetic pole position, then sensor maintenance requirements are reduced, but position estimation accuracy deteriorates
Solution Approach 1:
The patent enables users to adjust the amplitude and frequency parameters of the high-frequency voltage to optimize position estimation accuracy. This parameter adjustment capability ensures precise magnetic pole position detection while maintaining the benefits of sensorless operation, thereby reducing maintenance requirements without sacrificing measurement precision.
3Ease of operation
If fixed high-frequency voltage parameters are used, then control simplicity is improved, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The patent implements dynamics by transitioning from fixed high-frequency voltage parameters to user-adjustable parameters. This allows the control system to adapt to different operating conditions and machine characteristics while maintaining ease of operation through an intuitive parameter adjustment interface, thereby achieving both simplicity and versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables users to easily determine the amplitude and frequency of high-frequency voltage, reducing noise and position errors, while allowing for optimal operation of synchronous rotating machines without sensors.
Implementation Method 1
application of an alternating-current voltage to a synchronous rotating machine results in generation of a current having an amplitude in a direction orthogonal to the alternating-current voltage
Data Source
AI summary
A machine learning device includes: a state observer that observes, as a state variable, at least one of driving noise of a synchronous rotating machine and an error with respect to a preset position of a rotational position of the synchronous rotating machine determined by driving voltage; and a learner that determines a value of a parameter on a basis of the state variable observed by the state observer. The learner includes: a reward calculator that calculates a reward on a basis of the state variable; and a function updater that determines the value of the parameter on a basis of the reward that has been calculated. The reward calculator increases the reward when the driving noise is smaller than a target value of driving noise.