Rotary Speed Sensor Adaptive Hysteresis Noise Rejection
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Solution Overview
Problem
Conventional rotating machinery speed detection systems face challenges such as electrical noise, manufacturing variations, and vibration, which affect the accuracy of rotational speed measurements, particularly at low speeds and in the presence of noise close to the fundamental frequency.
Innovation Solution
A rotary speed detection device comprising a comparator module, a sensor lead, and a limit set module that adjusts hysteresis levels based on the amplitude of the oscillating voltage waveform, using peak or root-mean-square detection to provide upper and lower limits, thereby improving noise rejection and accuracy across varying rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filtering methods are used to reduce noise in speed detection, then noise rejection is improved, but measurement accuracy deteriorates at low speeds and when noise frequency is close to fundamental frequency
Solution Approach 1:
The patent changes the parameter of hysteresis level dynamically based on the amplitude of the oscillating voltage waveform. By adjusting the hysteresis level according to signal amplitude, the system achieves adaptive noise rejection that maintains measurement accuracy across different operating conditions, particularly at low speeds where conventional fixed filtering fails.
Solution Approach 2:
The patent implements a dynamic hysteresis level that varies with the amplitude of the sensor output signal. This dynamic adjustment allows the comparator to adapt to changing signal conditions in real-time, improving both noise rejection and measurement accuracy compared to static filtering methods.
2Object-affected harmful factors
If hysteresis level is increased to improve noise rejection, then noise rejection is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent changes the hysteresis level parameter dynamically based on signal amplitude characteristics. The hysteresis level is set to a higher value when signal amplitude is large (improving noise rejection) and adjusted appropriately when amplitude is small (maintaining measurement accuracy), thus resolving the trade-off between noise rejection and accuracy.
Solution Approach 2:
The system implements a dynamic hysteresis mechanism where the hysteresis level is continuously adjusted according to the amplitude of the oscillating voltage waveform. This dynamic adaptation allows the system to optimize both noise rejection and measurement accuracy under varying operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the accuracy of rotational speed detection at low speeds and reduces errors caused by noise, providing reliable speed measurements even in conditions where conventional filtering is ineffective.
Implementation Method 1
a coil fixed relative to the gear element and electrically connected to the sensor lead, a pole piece extending through the coil, and a magnet connected to the power piece. The rotation sensor coil can be configured to apply a voltage to the sensor lead that varies according gear element rotational speed.
Implementation Method 2
The limit set module is connected to the sensor lead node and to the comparator by an upper limit lead and a lower limit lead to provide upper and lower limits to the comparator that vary according to amplitude variation in voltage applied to the sensor lead.
Data Source
AI summary
A speed detection device includes a comparator module, a sensor lead with a node connected to the comparator module, and a limit set module. The limit set module is connected to the sensor lead node and to the comparator by an upper limit lead and a lower limit lead to provide upper and lower limits to the comparator that vary according to amplitude variation in voltage applied to the sensor lead.