An Improved Speed Sensing Method for Drive Control

Variable-speed electrical drive control typically relies upon a two-loop scheme, one for torque/speed and another for stator current control. In modern drive control methods, the actual mechanical speed is needed for both loops. In practical applications, the speed is often acquired by incremental r...

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Main Authors: Manuel R. Arahal, Manuel G. Satué, Juana M. Martínez-Heredia, Francisco Colodro
Format: Article
Language:English
Published: MDPI AG 2025-01-01
Series:Sensors
Subjects:
Online Access:https://www.mdpi.com/1424-8220/25/2/515
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author Manuel R. Arahal
Manuel G. Satué
Juana M. Martínez-Heredia
Francisco Colodro
author_facet Manuel R. Arahal
Manuel G. Satué
Juana M. Martínez-Heredia
Francisco Colodro
author_sort Manuel R. Arahal
collection DOAJ
description Variable-speed electrical drive control typically relies upon a two-loop scheme, one for torque/speed and another for stator current control. In modern drive control methods, the actual mechanical speed is needed for both loops. In practical applications, the speed is often acquired by incremental rotary encoders. The most used method derives speed from an encoder pulse count during a fixed amount of time. It is known that this sensing method produces time delay in the speed feedback loop as well as fluctuations in the speed measurements. Time lags produce phase loss that has potentially negative effects on the overall drive performance. Nevertheless, the pulse counting method is favored in most cases due to its simplicity and existing support for its use in digital signal processors. In this paper, a new speed sensing method is proposed to reduce time lag without incurring increased fluctuations. The proposal uses a novel transient detector to determine the actual operational regime of the drive: transient or stationary. Transient detection is not based on measured speeds but works directly with the train of incoming encoder pulses. The method is designed to work well with established digital signal processor routines. The proposal is assessed through experimentation on a real five-phase induction motor.
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series Sensors
spelling doaj-art-12d1352f10af4e208226f1f89a6c081b2025-01-24T13:49:12ZengMDPI AGSensors1424-82202025-01-0125251510.3390/s25020515An Improved Speed Sensing Method for Drive ControlManuel R. Arahal0Manuel G. Satué1Juana M. Martínez-Heredia2Francisco Colodro3Departamento de Ingeniería de Sistemas y Automática, Universidad de Sevilla, 41092 Seville, SpainDepartamento de Ingeniería de Sistemas y Automática, Universidad de Sevilla, 41092 Seville, SpainDepartamento de Ingeniería Electrónica, Universidad de Sevilla, 41092 Seville, SpainDepartamento de Ingeniería Electrónica, Universidad de Sevilla, 41092 Seville, SpainVariable-speed electrical drive control typically relies upon a two-loop scheme, one for torque/speed and another for stator current control. In modern drive control methods, the actual mechanical speed is needed for both loops. In practical applications, the speed is often acquired by incremental rotary encoders. The most used method derives speed from an encoder pulse count during a fixed amount of time. It is known that this sensing method produces time delay in the speed feedback loop as well as fluctuations in the speed measurements. Time lags produce phase loss that has potentially negative effects on the overall drive performance. Nevertheless, the pulse counting method is favored in most cases due to its simplicity and existing support for its use in digital signal processors. In this paper, a new speed sensing method is proposed to reduce time lag without incurring increased fluctuations. The proposal uses a novel transient detector to determine the actual operational regime of the drive: transient or stationary. Transient detection is not based on measured speeds but works directly with the train of incoming encoder pulses. The method is designed to work well with established digital signal processor routines. The proposal is assessed through experimentation on a real five-phase induction motor.https://www.mdpi.com/1424-8220/25/2/515induction motormulti-phase IMpredictive controlspeed sensing
spellingShingle Manuel R. Arahal
Manuel G. Satué
Juana M. Martínez-Heredia
Francisco Colodro
An Improved Speed Sensing Method for Drive Control
Sensors
induction motor
multi-phase IM
predictive control
speed sensing
title An Improved Speed Sensing Method for Drive Control
title_full An Improved Speed Sensing Method for Drive Control
title_fullStr An Improved Speed Sensing Method for Drive Control
title_full_unstemmed An Improved Speed Sensing Method for Drive Control
title_short An Improved Speed Sensing Method for Drive Control
title_sort improved speed sensing method for drive control
topic induction motor
multi-phase IM
predictive control
speed sensing
url https://www.mdpi.com/1424-8220/25/2/515
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