Efficient Position-Sensorless Motor Control with Reduced Complexity
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Summary
Problems
Conventional position-sensorless motor control techniques require complex signal processing to estimate rotor position, which is inefficient and computationally intensive.
Innovation solutions
A position-sensorless motor control device that reduces axis error between the d- and γ-axes by superposing a current with a different frequency on the drive current, extracting γ-axis and δ-axis components, and controlling the motor based on the arithmetic product of these components, allowing for simple processing and axis error reduction.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional position-sensorless control techniques are used to estimate rotor position, then position-sensorless control is achieved, but complicated signal processing is required
Why choose this principle:
The patent changes the frequency parameter of the injected voltage signal to enable rotor position estimation. By injecting a high-frequency rotation voltage and detecting the resulting current response at this specific frequency, the system can estimate rotor position without complex processing of multiple frequency components or sophisticated signal analysis algorithms.
Principle concept:
If conventional position-sensorless control techniques are used to estimate rotor position, then position-sensorless control is achieved, but complicated signal processing is required
Why choose this principle:
The patent extracts only the necessary information (rotor position) by detecting the current response at the injected high-frequency voltage frequency. Instead of processing the entire current signal with complex algorithms, the system extracts the specific frequency component that contains the rotor position information, simplifying the overall processing requirement.
Application Domain
Data Source
AI summary:
A position-sensorless motor control device that reduces axis error between the d- and γ-axes by superposing a current with a different frequency on the drive current, extracting γ-axis and δ-axis components, and controlling the motor based on the arithmetic product of these components, allowing for simple processing and axis error reduction.
Abstract
A position-sensorless motor control device has a superposer that superposes, on the drive current with which the motor is driven, a superposed current having a different frequency than the drive current, a superposed component extractor that extracts, from the motor current fed to the motor, the γ-axis and δ-axis components of the superposed current, and a controller that controls the motor so that the direct-current component of the arithmetic product of the extracted γ-axis and δ-axis components of the superposed current converges to zero.