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DSP-Based Stepping Motor Drivers for the LHC Collimators
The control electronics of the LHC collimators stepping motors will be located in radiation safe zones up to 800 meters far from the motors. With such cable lengths the standard chopping drivers do not work properly because of the voltage losses on the cable and even more because of the high cable c...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
2008
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1109/TNS.2007.913475 http://cds.cern.ch/record/1110973 |
_version_ | 1780914290723651584 |
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author | Masi, A Conte, G L Losito, R Martino, M |
author_facet | Masi, A Conte, G L Losito, R Martino, M |
author_sort | Masi, A |
collection | CERN |
description | The control electronics of the LHC collimators stepping motors will be located in radiation safe zones up to 800 meters far from the motors. With such cable lengths the standard chopping drivers do not work properly because of the voltage losses on the cable and even more because of the high cable capacitance. The capacitance in fact produces a ringing phenomenon on the driver feedback current that limits the control chopping frequency to the point of being incompatible with the tight EM emissions requirements of the LHC tunnel. In some cases the feedback loop may even become unstable and the driver would fail. The problem was solved by accurately modeling the overall motor-cable system taking into account non-linearities due to hysteresis and eddy currents and by designing an adaptive digital controller, self-tuning to the real cable length. The controller will aim at increasing the chopping frequency to reduce the spectral density of the emissions and at damping the oscillations of the feedback current to avoid instability. In this paper the model of the motor-cable system as well as the digital controller are described. Particular attention is devoted to the hardware implementation based on a TI Cx2000 DSP. |
id | cern-1110973 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2008 |
record_format | invenio |
spelling | cern-11109732019-09-30T06:29:59Zdoi:10.1109/TNS.2007.913475http://cds.cern.ch/record/1110973engMasi, AConte, G LLosito, RMartino, MDSP-Based Stepping Motor Drivers for the LHC CollimatorsAccelerators and Storage RingsEngineeringThe control electronics of the LHC collimators stepping motors will be located in radiation safe zones up to 800 meters far from the motors. With such cable lengths the standard chopping drivers do not work properly because of the voltage losses on the cable and even more because of the high cable capacitance. The capacitance in fact produces a ringing phenomenon on the driver feedback current that limits the control chopping frequency to the point of being incompatible with the tight EM emissions requirements of the LHC tunnel. In some cases the feedback loop may even become unstable and the driver would fail. The problem was solved by accurately modeling the overall motor-cable system taking into account non-linearities due to hysteresis and eddy currents and by designing an adaptive digital controller, self-tuning to the real cable length. The controller will aim at increasing the chopping frequency to reduce the spectral density of the emissions and at damping the oscillations of the feedback current to avoid instability. In this paper the model of the motor-cable system as well as the digital controller are described. Particular attention is devoted to the hardware implementation based on a TI Cx2000 DSP.oai:cds.cern.ch:11109732008 |
spellingShingle | Accelerators and Storage Rings Engineering Masi, A Conte, G L Losito, R Martino, M DSP-Based Stepping Motor Drivers for the LHC Collimators |
title | DSP-Based Stepping Motor Drivers for the LHC Collimators |
title_full | DSP-Based Stepping Motor Drivers for the LHC Collimators |
title_fullStr | DSP-Based Stepping Motor Drivers for the LHC Collimators |
title_full_unstemmed | DSP-Based Stepping Motor Drivers for the LHC Collimators |
title_short | DSP-Based Stepping Motor Drivers for the LHC Collimators |
title_sort | dsp-based stepping motor drivers for the lhc collimators |
topic | Accelerators and Storage Rings Engineering |
url | https://dx.doi.org/10.1109/TNS.2007.913475 http://cds.cern.ch/record/1110973 |
work_keys_str_mv | AT masia dspbasedsteppingmotordriversforthelhccollimators AT contegl dspbasedsteppingmotordriversforthelhccollimators AT lositor dspbasedsteppingmotordriversforthelhccollimators AT martinom dspbasedsteppingmotordriversforthelhccollimators |