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Title
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Sensorless load angle control for two-phase hybrid stepper motors
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Author
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Abstract
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| The widely used full-step open-loop stepping motor drive algorithms are characterised by a low torque/power ratio, large torque ripple and resonance problems. In order to use stepping motors in more demanding applications, closed-loop control is needed. In this paper, a previously described load angle estimation algorithm, solely based on voltage and current measurements, is used to provide the necessary feedback without using a mechanical position sensor. This paper introduces a novel closed-loop load angle controller which optimises the current level based on the estimated load angle. This approach is challenging as the current - load angle dynamics are highly nonlinear. However, in this research a linear model is proposed and used to tune a PI load angle controller. The controller reduces the current level to obtain the optimal load angle but does not change the way stepping-motor are driven by step command pulses. This results in a broad industrial employability of these algorithms. The proposed sensorless controller is validated trough both simulations and measurements. (C) 2017 Elsevier Ltd. All rights reserved. |
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Language
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English
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Source (journal)
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Mechatronics. - Oxford
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Publication
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Oxford
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2017
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ISSN
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0957-4158
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DOI
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10.1016/J.MECHATRONICS.2017.02.003
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Volume/pages
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43
(2017)
, p. 6-17
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ISI
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000400216100002
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Full text (Publisher's DOI)
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