Abstract
The encoders are electromechanical devices that give information about the angular position and the number of turns of the shaft, which they are connected. These devices are divided into digital or analogue according to output types. On digital outputs, the output can be binary coded, gray coded or pulsed. The frequency (M) or period (T) method produces accurate results in pulse-output encoders. However, these methods alone cannot give accurate results in some encoder types, which are saw tooth type encoders that produce analogue outputs in different shapes. In this study, a new method was proposed, which reduces the relative error ratio too much below 1 % in an absolute encoder that produces an analogue output ranging from 0 V to 5 V according to the angular position of the shaft. Unlike in the studies in the literature, M method and Analog Digital Converter (ADC) were used together. Thanks to this proposed method (M + ADC), it is possible to increase the measurement accuracy of the encoders with analogue output in all speed regions.
Highlights
Encoders are used in angular position and speed feedback of electric motors
A new method is proposed, which reduces the relative error ratio too much below 1 % in an absolute encoder that produces an analogue output ranging from 0 V to 5 V according to the angular position of the shaft
We used a mechanical system that we designed for the speed test of the battery-operated wheelchair. In this system consisting of two cylinders, the speed of the vehicle is determined by an absolute encoder connected to the (a) cylinder
Summary
Encoders are used in angular position and speed feedback of electric motors. The encoders are electromechanical devices that produce digital or analogue signals according to the movement of the motor shaft to which they are connected They give information about the number of rotations of the shaft and its angular position. The value obtained from the counter at the end of the set time is divided by the number of pulses that the encoder produces in one revolution This new value gives the number of rotations of the shaft at the time specified by the timer. A new method is proposed, which reduces the relative error ratio too much below 1 % in an absolute encoder that produces an analogue output ranging from 0 V to 5 V according to the angular position of the shaft. The proposed new method (M + ADC) aims to increase the measurement accuracy over the entire speed region
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