• 전력전자학회논문지
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• 제9권5호
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• pp.485-490
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• 2004

본 논문에서는 나노급 서보 전동기의 초정밀 위치제어를 위한 위치정보를 얻기 위하여 정현파 엔코더에 적용하기 위한 새로운 위치 보간 알고리즘에 대하여 기술한다. 기존의 정현파 엔코더에서 사인 및 코사인 파형에서 정밀위치정보를 얻기 위하여 대용량의 메모리와 빠른 변환속도를 갖는 2개의 A/D를 이용하였다. 그러나 제안된 보간 방법을 이용할 경우에는 적은 용량의 메모리와 단지 하나의 A/D와 비교기만을 이용하여 정현파 엔코더에서 정밀위치정보를 얻을 수 있다. 초정밀 제어를 위한 제안된 알고리즘의 유용성은 실험결과로부터 알 수 있다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 추계학술대회 논문집
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• pp.56-59
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• 2003

This paper presents new interpolation algorithm for measuring high resolution position information which is propered to nano servo control motor using analog quadrature encoder. In the past, there is a large memory and two high price A/D converter for high resolution analog quadrature encoder interpolation. but this paper show that it can make high resolution interpolate using small memory, one A/D converter and comparator. Experimental results show that the proposed algorithm for high resolution position is useful.

• Journal of Power Electronics
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• 제6권2호
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• pp.139-145
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• 2006

This paper describes the ultra precise position estimation of a servomotor using a sinusoidal encoder based on Arcsine Interpolation Method for the cost reduction of circuit design. The amplitude and offset errors of the sinusoidal encoder output signals, from the encoder itself and analog signal processing procedures, are effectively compensated and on-line tuned by utilizing a low cost programmable differential amplifier without any special expensive equipment. For a theoretical evaluation of the practical resolution of this system, the relationship between the amplitude of ADC(Analog to Digital Converter) input signal errors and the anticipated resolution is also addressed. The performance of the proposed method is verified by comparing it with speed control characteristics of the servomotor driving system using a digital incremental 50,000ppr encoder in the experiments.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.260-264
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• 2005

This paper describes the ultra precise position control of servo motor using sinusoidal encoder based on 'Arcsine Interpolation Method'. First, the paper theoretically analyzes and verify throughout experiments, the relationship between A/D converter input ripple and the total resolution to measure the precise position. Second, this paper presents a way to compensate the total gain and offset error by utilizing a low cost programmable differential amp, by which without any special expensive equipments they are easily on-line tuned and effectively compensated. Lastly, it was compared to servomotor position control characteristics using digital incremental 50,000ppr encoder. The test results show that, with much cheaper sinusoidal encoder, the proposed method exhibits better performance both in position control and ASD applications than the 50,000ppr optical encoder.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.237-239
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• 2005

This paper describes the ultra precise position estimation of a servomotor using sinusoidal encoder based on Arcsine Interpolation Method. The amplitude and offset errors of the sinusoidal encoder output signals are effectively compensated and on-line tuned by utilizing a low cost programmable differential amp without any special expensive equipments. To theoretically evaluate the practical resolution of this system, the relationship between the amplitude of A/D converter input signal errors and the anticipated resolution is briefly dealt with. The performance of the proposed method is verified by the experiments, by comparing it with position and speed control characteristics of the servomotor driving system using a digital incremental 50,000ppr encoder.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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• pp.839-841
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• 2004

This paper presents a SPMSM servo motor drive system using high performance TMS320 F281T DSP for the industrial application. This high performance DSP contains some special peripheral circuits such as PWM (Pulse Width Modulation) waveform generation circuit, Quadrature Encoder Pulse (QEP) generation circuit and Analog to Digital Converter (ADC) circuit. In this paper, a servo drive control system is constructed using high performance DPS for the overall system cost reduction and the size minimization.