AC Rotary Machine Control Apparatus Feedforward Disturbance Suppression
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Solution Overview
Problem
Existing control systems for AC rotary machines with multiple windings face challenges in reducing the number of operations, improving response speed, and effectively suppressing disturbances, particularly when using low-cost microcomputers with low operation speeds, due to complex calculations and interference between current control systems.
Innovation Solution
A control apparatus for AC rotary machines that includes current detection units, basic voltage calculation units, and voltage calculation units for each winding, allowing voltage command values to be calculated based on current command values, basic voltages, and currents of both windings, with the option to include additional units for improved response and disturbance suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If non-interference control is implemented using detected currents from multiple windings, then interference effects can be suppressed, but the number of operations increases and response speed decreases due to time delays between detection and control operations
Solution Approach 1:
The patent applies preliminary action by calculating the non-interference voltage in advance using current command values and electric constants before the actual current detection and control operations. This feedforward approach computes the compensation voltage based on expected current variations, allowing the control system to respond immediately without waiting for current detection and processing delays, thus maintaining high response speed while suppressing interference effects
2Speed
If non-interference voltage calculation is performed for each inverter control circuit, then feedforward response is improved, but the number of complicated operations increases significantly
Solution Approach 1:
The patent merges the non-interference voltage calculation into a single shared unit that serves all inverter control circuits. Instead of having separate calculation units for each inverter, one unified non-interference voltage calculation unit computes the compensation voltage based on the total current command values and electric constants, then distributes this voltage to all inverters. This consolidation maintains the feedforward response benefit while dramatically reducing the number of operations and computational complexity
Data Source
AI summary
A control apparatus for an AC rotary machine includes a current detection unit that detects a current of a first winding and a current of a second winding, a basic voltage calculation unit that calculates a basic voltage on the basis of a current command value, a first voltage calculation unit that calculates a voltage command value of the first winding on the basis of the current command value, the basic voltage, and the current of the first winding, and a second voltage calculation unit that calculates a voltage command value of the second winding on the basis of the current command value, the basic voltage, and the current of the second winding. At least the first voltage calculation unit calculates the voltage command value of the first winding by further taking into account the current of the second winding.