Multiplex-Winding Motor Position Estimation via Voltage and Current
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Solution Overview
Problem
In multiplex-winding rotary machines, when the rotational position detection means fails, the rotation performance decreases, and existing methods struggle to appropriately cope with this failure.
Innovation Solution
A driving apparatus for a multiplex-winding rotary machine that includes rotational position detection means, failure determination means, and control means to estimate the rotational position based on voltage and current from at least one winding group, allowing continued operation with minimal rotation performance even if the rotational position detection fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotational position detection means is used to control the rotary machine, then the rotary machine can be driven in a desired state, but the system cannot continue to drive when the rotational position detection means fails
Solution Approach 1:
The patent creates a virtual copy of the rotational position detection function through mathematical estimation. When the physical rotational position detector fails, the control device generates an estimated rotational position value based on voltage application patterns and current detection results, effectively copying the detection function through calculation rather than physical sensing.
Solution Approach 2:
The patent introduces current detection results as an intermediary element to bridge the gap when rotational position detection fails. By using the relationship between applied voltage, measured current, and rotational position, the system mediates the loss of direct position information through indirect electrical measurements.
2Reliability
If the rotational position detection means fails, then the detection function is lost, but the rotary machine should continue to operate with minimum performance
Solution Approach 1:
The patent uses readily available electrical measurements (voltage and current) that are already present in the system to create a backup position estimation method. These electrical signals serve as a low-cost, always-available alternative to the primary rotational position detector, requiring no additional expensive sensors or complex hardware.
Solution Approach 2:
The patent changes the measurement parameter from direct mechanical/electrical position sensing to electrical parameter analysis. By analyzing the relationship between applied voltage, measured current, and rotational position characteristics, the system transitions from direct position measurement to indirect estimation through electrical parameter relationships.
3Reliability
If multiple winding groups are provided, then the system can continue driving when some windings fail, but the control complexity increases
Solution Approach 1:
The patent divides the voltage application control into separate, independent control sections for each winding group. Each voltage application means can be controlled independently based on its own current detection results, allowing localized failure management without affecting other winding groups, thus simplifying the overall control architecture despite multiple windings.
Data Source
AI summary
Provided are rotational position detection means detecting the rotational position of a multiplex-winding rotary machine; failure determination means determining failure of the rotational position detection means; control means calculating a voltage instruction for each winding group, based on the rotational position detected by the rotational position detection means; and voltage application means applying voltage to each winding group, based on the voltage instruction. According to the failure determination by the failure determination means, the control means outputs a voltage instruction for rotational position estimation to the voltage application means, and estimates the rotational position θe, based on at least one of voltage and current obtained from the winding group in accordance with the voltage instruction.