A method of improving the resolution and accuracy of rotary encoders using a code compensation technique

Hagiwara, Nobumi; Suzuki, Yoshihisa; Murase, Hideaki

doi:10.1109/19.126640

Cited by 102 publications

(24 citation statements)

References 3 publications

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“…However, the cost of an incremental rotary encoder overwhelmingly increases depending on its resolution. On the other hand, a sinusoidal encoder can provide high resolution and high accuracy for high performance applications and at a low price when compared to incremental rotary encoders [1]- [12].…”

Section: Introductionmentioning

confidence: 99%

“…The position information from sinusoidal encoders can be calculated with several techniques [1]- [12]. Typically, the position information of sinusoidal encoder based systems can be obtained by a combination of the standard counting techniques associated with encoder interface circuitry and additional information provided by arctangent computation [2]- [6].…”

Section: Introductionmentioning

confidence: 99%

“…There are several approaches which have been described as either hardware or software methods [1]- [3], [5], [8]. In [1], digitized samples of sinusoidal encoder signals and the output of a divide by four counter circuit were used as an external trigger signal for updating the angular readings.…”

Section: Introductionmentioning

confidence: 99%

“…In [1], digitized samples of sinusoidal encoder signals and the output of a divide by four counter circuit were used as an external trigger signal for updating the angular readings. The gain and offset errors can be calibrated by analyzing a large number of random measurements to determine the minimum and maximum values.…”

Section: Introductionmentioning

confidence: 99%

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Signal Compensation for Analog Rotor Position Errors due to Nonideal Sinusoidal Encoder Signals

Kim¹,

Kim²,

Jang³

2014

Journal of Power Electronics

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This paper proposes a compensation algorithm for the analog rotor position errors caused by nonideal sinusoidal encoder output signals including offset and gain errors. In order to achieve a much higher resolution, position sensors such as resolvers or incremental encoders can be replaced by sinusoidal encoders. In practice, however, the periodic ripples related to the analog rotor position are generated by the offset and gain errors between the sine and cosine output signals of sinusoidal encoders. In this paper, the effects of offset and gain errors are easily analyzed by applying the concept of a rotating coordinate system based on the dq transformation method. The synchronous d-axis signal component is used directly to detect the amplitude of the offset and gain errors for the proposed compensator. As a result, the offset and gain errors can be well corrected by three integrators located on the synchronous d-axis component. In addition, the proposed algorithm does not require any additional hardware and can be easily implemented by a simple integral operation. The effectiveness of the proposed algorithm is verified through several experimental results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Signal Compensation for Analog Rotor Position Errors due to Nonideal Sinusoidal Encoder Signals

Kim¹,

Kim²,

Jang³

2014

Journal of Power Electronics

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“…Compared with the arc-tangent processing method used by other single pole pair magnetic encoder (7) , the processing algorithm based on data sheet-searching simplifies the operation and greatly improves the signal processing speed. In the practical application, firstly, the alnico (rotor) and the six magnetic sensing elements (stator) are fixed onto the motor; then the data sheet should be established by adjusting the system.…”

Section: Principle and Signal Processing Of Encodermentioning

confidence: 99%

Development of Novel Magnetic Encoder and Vector Control Method for Servo Control of High-Speed Motor

Hao

Liu

Mizugaki

2009

JAMDSM

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This paper presents a novel unipolar magnetic encoder and a new Vector control method of AC servo which can enable the feedback of the rotor position with high accuracy in high speed occasion. The signal generator of encoder consists of three pairs of semiconductor hall elements and a rotor of alnico magnet with one pair of poles. This encoder is featured with the operation module and the communication module to transmit an angular data in the form of asynchronous serial transfer protocol. Besides, a delay compensation algorithm is proposed to ensure the accurate estimation of instant angular position and the estimation error is also analyzed. At last, an experimental apparatus was built for a 600W, 4 pairs of pole, at rated speed 20,000min -1 , permanent-magnet synchronous motor drive and the proposed vector control scheme has been implemented. The experiment results supported the validity of the proposed magnetic encoder and vector control method for high-speed AC servo control within 0.05 % error of revolving speed.

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Implementation and evaluation of motion detection module based on hall sensors for the geared motor of automatic gate

Woo

2019

IEEJ Transactions Elec Engng

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The use of geared motor modules, installed in automatic doors to optimize the stability, efficiency, and manufacturing costs related to automatic door opening and closing, has been attracting scientific attention. Generally, signal processing and the sensor circuit board inserted in the geared motor have been widely used in optical systems. However, the optical system is disadvantageous in that it is susceptible to external shock, humidity, and dust. In this article, a magnetic impulse ring-based motion detection circuit board simpler in structure than the existing optical systems, having excellent durability against external environments, and can be miniaturized is proposed. Experimental results show that the proposed module based on Hall sensor has RPM (revolution per minute) detection characteristics more than 6 dB better than conventional optical module. Also, the proposed module has about 14 dB excellent power consumption than existing optical modules, thus its applicability is confirmed.

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A method of improving the resolution and accuracy of rotary encoders using a code compensation technique

Cited by 102 publications

References 3 publications

Signal Compensation for Analog Rotor Position Errors due to Nonideal Sinusoidal Encoder Signals

Signal Compensation for Analog Rotor Position Errors due to Nonideal Sinusoidal Encoder Signals

Development of Novel Magnetic Encoder and Vector Control Method for Servo Control of High-Speed Motor

Implementation and evaluation of motion detection module based on hall sensors for the geared motor of automatic gate

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