Resolver Signal Peak Detection with Noise Filtering and Phase Compensation
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Solution Overview
Problem
Existing methods for detecting resolver signals in motors face challenges in accurately detecting peak magnitudes, peak times, and peak points due to noise introduction, which leads to position angle errors affecting motor control.
Innovation Solution
A system and method utilizing a bandpass filter, a moving average processor, and a lead phase compensator to remove noise from resolver output signals, maintain the signal magnitude, and compensate for phase delays, enabling accurate detection of peak parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bandpass filter is used to remove noise from the resolver output signal, then noise removal is improved, but signal magnitude changes and phase delay occur
Solution Approach 1:
A lead phase compensator is introduced as an intermediary component after the bandpass filter to compensate for the phase delay caused by the filter. The compensator adjusts the phase of the filtered signal to restore it to the original phase, thereby eliminating the measurement error while preserving the noise removal benefit
Solution Approach 2:
The system measures the actual phase delay introduced by the bandpass filter and uses this information to adjust the compensation amount in the lead phase compensator. This feedback mechanism ensures that the phase is accurately restored despite variations in operating conditions
2Measurement precision
If the excitation signal is input as a square wave to the resolver, then position angle detection is enabled, but harmonic noise is introduced into the resolver output signal
Solution Approach 1:
The bandpass filter extracts only the fundamental frequency component of the resolver output signal, separating it from the harmonic noise. By filtering out frequencies other than the fundamental frequency, the system obtains a clean sine or cosine wave suitable for accurate position angle detection
Solution Approach 2:
The system acknowledges that square wave excitation necessarily introduces harmonic noise, but converts this harmful effect into a benefit by using the harmonic content as a signature to identify and filter out unwanted frequencies, while preserving the necessary fundamental frequency for position detection
3Measurement precision
If noise is present in the resolver output signal, then peak point detection becomes difficult, but using filtering methods introduces phase delay time
Solution Approach 1:
The lead phase compensator acts as an intermediary that reverses the time delay introduced by the bandpass filter. By calculating the measured phase delay and applying an equal and opposite phase shift, the system recovers the original timing information needed for accurate peak point detection
Data Source
AI summary
The present disclosure provides a system and method for detecting a resolver signal of a motor allowing accurate detection of a peak magnitude, a peak time, a peak point, etc. of a resolver output signal. A bandpass filter and a moving average processor are configured to remove noise introduced into the resolver output signal and maintain a magnitude of the resolver output signal at original magnitude without change. A phase compensation process performed by a lead phase compensator can compensate a phase delay time for the resolver output signal.