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Subject: search.filters.subject.Resolver converter

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    Resolver-signal demodulator for variable frequency excitation signals
    (2014-02-04)
    Kaewpoonsuk, Anucha
    ;
    Rerkratn, Apinai
    ;
    Riewruja, Vanchai
    An alternative approach to implement the resolver-signal demodulator is presented in this paper. The realization technique utilizes the phase shift behavior of an all-pass filter connected with a designed logic circuit to generate the control signals for sub-circuits. The proposed demodulator produces two output signal voltages, which are the sine and cosine envelopes of resolver-shaft angle without low-pass filter circuit. Experimental results verifying the performance of the proposed circuit are closely agreed with the expected values. © 2014 ISSN 1881-803X.
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    A simple amplitude detector-based demodulator for resolver converters
    (2010-12-01)
    Kaewpoonsuk, Anucha
    ;
    Katman, Ratchanoo
    ;
    Kamsri, Thawatchai
    ;
    Rerkratn, Apinai
    ;
    Riewruja, Vanchai
    This paper presents a simple method based on sinusoidal-amplitude detector for realizing the resolver-signal demodulator. The proposed demodulator consists of two full-wave rectifiers, two ±unity-gain amplifiers, and two sinusoidal-amplitude detectors with control switches. Two output voltages are proportional to sine and cosine envelopes of resolver-shaft angle without low-pass filter. Experimental results demonstrating characteristic of the proposed circuit are included. ©ICROS.
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    A novel resolver-to-DC converter based on OTA-based inverse-sine function circuit
    (2008-12-01)
    Kaewpoonsuk, Anucha
    ;
    Petchmaneelumka, Wandee
    ;
    Rerkratn, Apinai
    ;
    Tammaruckwattana, Sirichai
    ;
    Riewruja, Vanchai
    A new technique for realizing the resolver-to-DC converter using the OTA-based inverse-sine function circuit is presented. The proposed converter comprises the demodulator, absolute detector, minimum detector, ± unity-gain amplifier, controlled signal logic circuit, and OTA-based inverse-sine function circuit. The output voltage is linearly proportional to the resolver angle with maximum absolute error of about 0.195%, which is less than the error from the conventional resolver-to-DC converter based on the similar OTA-based inverse-sine function circuit. PSPICE simulation and experimental results verifying the performances of the proposed circuit are in close agreement with the expected values. © 2008 SICE.
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    A full-range-360° resolver-to-DC converter
    (2007-12-01)
    Kaewpoonsuk, Anucha
    ;
    Kamsri, Thawatchai
    ;
    Petchmaneelumka, Wandee
    ;
    Riewruja, Vanchai
    In this paper, a triangular-to-sawtooth waveform converter and a control logic circuit have been described. Using two designed circuits connected with OTA-based sine-to-triangular wave converter and demodulator, a resolver-to-DC converter is proposed. The converter linearly produces output signal proportional to the shaft angle in full range of 360°. Experimental results verifying the performances of the proposed converter circuit agree well with the theoretical prediction. ©ICROS.
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    A simple resolver-to-DC converter
    (2006-12-01)
    Kaewpoonsuk, Anucha
    ;
    Petchmaneelumka, Wandee
    ;
    Kamsri, Thawatchai
    ;
    Riewruja, Vanchai
    In this paper, a simple resolver-to-dc converter is presented. The realization method is based on the proposed OTA-based sin<sup>-1</sup> function circuit. The proposed converter provides a simple configuration and produces an output signal, which is linearity proportional to the shaft angle. Performances of the proposed circuit are discussed in detail and confirmed by the experimental results. © 2006 ICASE.