Signal Processing Apparatus for Servo Motor Encoder Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In servo motor systems, time variant signals from optical encoders can be adversely affected by temperature and environmental factors, leading to DC offsets, amplitude attenuation, and phase differences, which compromise the accuracy of position and speed control.
Innovation Solution
A signal processing apparatus comprising a first adder, a weighting integrator, and gain-adjustable amplifiers is used to process time variant signals, eliminating DC offsets, maintaining phase differences at 90 degrees, and adjusting amplitudes to fixed values, thereby stabilizing the feedback signals for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional signal processing is used without correction, then the system is simple, but DC offsets and amplitude attenuation occur due to temperature and environmental factors, compromising control accuracy
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for DC offsets and amplitude variations in lookup tables before actual operation. During runtime, the system simply retrieves and applies these pre-computed corrections, avoiding complex real-time calculations while maintaining high measurement precision for position and speed control
Solution Approach 2:
The patent introduces intermediary correction circuits that process the encoder signals between the optical encoder and the control system. These intermediary components include DC offset correction circuits and amplitude correction circuits that mediate the signal transmission, compensating for environmental effects without requiring complex changes to the core control system
2Reliability
If DC offset correction is applied to eliminate harmful factors, then control accuracy improves, but the device complexity increases due to additional correction circuits
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors the encoder signals for DC offset drift and automatically adjusts correction values. The correction circuits receive feedback about signal characteristics and dynamically adapt their correction amounts, improving reliability while keeping the control logic relatively simple through automated closed-loop adjustment
Solution Approach 2:
The DC offset correction system performs self-service by automatically detecting and correcting its own drift without external intervention. The correction circuits are designed to self-calibrate using reference signals and automatically compensate for temperature-induced offsets, reducing the need for manual adjustment and simplifying operation despite the presence of correction hardware
3Stability of the object's composition
If amplitude correction is applied to maintain fixed amplitude values, then signal consistency improves, but additional gain-adjustable amplifiers increase device complexity
Solution Approach 1:
The patent applies dynamics by using gain-adjustable amplifiers that dynamically adapt their amplification factor based on real-time signal amplitude measurements. The system continuously monitors encoder signal amplitude and automatically adjusts the gain to maintain consistent output amplitude, enabling the correction mechanism itself to be flexible and adaptive rather than rigid and fixed
Solution Approach 2:
The patent utilizes parameter changes by varying the amplification gain parameter in response to detected amplitude variations. The gain-adjustable amplifiers change their operating parameter (gain factor) based on feedback about signal amplitude, allowing the system to compensate for amplitude attenuation caused by environmental factors through dynamic parameter adjustment rather than hardware redesign
Data Source
AI summary
A signal processing apparatus comprising: a first gain-adjustable amplifier receiving the first input signal and generating a first output signal according to a gain; a first magnitude detector receiving the first output signal and generating a first magnitude signal; a first adder for subtracting the first magnitude signal from a reference value, thereby generating a first sampling signal; and a first weighting integrator receiving the first input signal, the second input signal and the first sampling signal, and generating the first integrated signal to control the gain of the first gain-adjustable amplifier.