Staff View: Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission

Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission

In a typical continuously variable transmission (CVT) for automotive, engine torque is transmitted from the primary pulley (connected to the vehicle's engine) to the secondary pulley (connected to the wheels) through a metal pushing V-belt. The CVT ratio (rCVT ) is defined as the pitch radius o...

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Main Authors:	Delhaise, L. J., Mazali, Izhari Izmi, Daud, Z. H. C., Kob, M. S. C., Asus, Z.
Format:	Conference or Workshop Item
Language:	English
Published:	2020
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/91384/1/IzhariIzmiMazali2020_CurrentUsagebyaDCMotor.pdf http://eprints.utm.my/id/eprint/91384/ http://dx.doi.org/10.1088/1757-899X/884/1/012085
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spelling	my.utm.913842021-06-30T12:08:36Z http://eprints.utm.my/id/eprint/91384/ Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission Delhaise, L. J. Mazali, Izhari Izmi Daud, Z. H. C. Kob, M. S. C. Asus, Z. TJ Mechanical engineering and machinery In a typical continuously variable transmission (CVT) for automotive, engine torque is transmitted from the primary pulley (connected to the vehicle's engine) to the secondary pulley (connected to the wheels) through a metal pushing V-belt. The CVT ratio (rCVT ) is defined as the pitch radius of the belt on the secondary pulley divided by the pitch radius on the primary pulley. Conventionally, rCVT is varied using hydraulic pressure generated by an oil pump which is powered by the engine. A continuous hydraulic pressure is required to maintain high clamping force applied on the belt so that sufficient traction between the belt and the pulleys can always be provided. This requirement, unfortunately, causes significant power losses in the CVT and to address this, the idea of electro-mechanical CVT (EM CVT) is proposed. In an EM CVT, rCVT is varied using a power screw mechanism and a DC motor while the desired ratio and the belt's clamping force is maintained using the thread of the power screw mechanism, consequently eliminating the aforementioned issue. This paper describes the process of measuring the current used by a DC motor to vary rCVT in an EM CVT. The results show that the current usage is higher during upshifting from rCVT of 1.95 to 1.43 (about 45 A) as compared to downshifting from 1.43 to 1.95 (about 23 A). This is due to the application of disc springs in the secondary pulley that reduces the required motor torque for downshifting. The results also prove that no current is consumed by the motor during a constant rCVT . In conclusion, the motor's current usage has been successfully measured and the results can be used for a future development of the EM CVT's battery system. 2020-07 Conference or Workshop Item PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/91384/1/IzhariIzmiMazali2020_CurrentUsagebyaDCMotor.pdf Delhaise, L. J. and Mazali, Izhari Izmi and Daud, Z. H. C. and Kob, M. S. C. and Asus, Z. (2020) Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission. In: 2019 Sustainable and Integrated Engineering International Conference, SIE 2019, 8 December 2019 - 9 December 2019, The Everly Hotel, Putrajaya, Malaysia. http://dx.doi.org/10.1088/1757-899X/884/1/012085
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Delhaise, L. J. Mazali, Izhari Izmi Daud, Z. H. C. Kob, M. S. C. Asus, Z. Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission
description	In a typical continuously variable transmission (CVT) for automotive, engine torque is transmitted from the primary pulley (connected to the vehicle's engine) to the secondary pulley (connected to the wheels) through a metal pushing V-belt. The CVT ratio (rCVT ) is defined as the pitch radius of the belt on the secondary pulley divided by the pitch radius on the primary pulley. Conventionally, rCVT is varied using hydraulic pressure generated by an oil pump which is powered by the engine. A continuous hydraulic pressure is required to maintain high clamping force applied on the belt so that sufficient traction between the belt and the pulleys can always be provided. This requirement, unfortunately, causes significant power losses in the CVT and to address this, the idea of electro-mechanical CVT (EM CVT) is proposed. In an EM CVT, rCVT is varied using a power screw mechanism and a DC motor while the desired ratio and the belt's clamping force is maintained using the thread of the power screw mechanism, consequently eliminating the aforementioned issue. This paper describes the process of measuring the current used by a DC motor to vary rCVT in an EM CVT. The results show that the current usage is higher during upshifting from rCVT of 1.95 to 1.43 (about 45 A) as compared to downshifting from 1.43 to 1.95 (about 23 A). This is due to the application of disc springs in the secondary pulley that reduces the required motor torque for downshifting. The results also prove that no current is consumed by the motor during a constant rCVT . In conclusion, the motor's current usage has been successfully measured and the results can be used for a future development of the EM CVT's battery system.
format	Conference or Workshop Item
author	Delhaise, L. J. Mazali, Izhari Izmi Daud, Z. H. C. Kob, M. S. C. Asus, Z.
author_facet	Delhaise, L. J. Mazali, Izhari Izmi Daud, Z. H. C. Kob, M. S. C. Asus, Z.
author_sort	Delhaise, L. J.
title	Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission
title_short	Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission
title_full	Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission
title_fullStr	Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission
title_full_unstemmed	Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission
title_sort	current usage by a dc motor to vary ratio in an electro-mechanical continuously variable transmission
publishDate	2020
url	http://eprints.utm.my/id/eprint/91384/1/IzhariIzmiMazali2020_CurrentUsagebyaDCMotor.pdf http://eprints.utm.my/id/eprint/91384/ http://dx.doi.org/10.1088/1757-899X/884/1/012085
_version_	1705056705916698624
score	13.211869

Current usage by a DC motor to vary ratio in an electro-mechanical continuously variable transmission

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