This work presents a novel self-regulated toroidal continuously variable transmission (ART-CVT) that features a passive control of the speed ratio, achieved with no need for supplementary actuation system. The proposed transmission system is based on a full-toroidal CVT topology which combines a specially shaped geometry of the conjugate profiles with a pre-load system to create a correlation between the speed ratio and the input torque. Such a solution is conceived to reduce the complexity that is usually associated with active regulated systems and it is envisaged to be applicable to low-power/low-cost systems such as small wind turbines, powered-two-wheelers, or bicycles. We illustrate a simplified mathematical model that is able to describe the response of the proposed ART-CVT in quasi-static steady-state operational conditions. Additionally, we propose a case-study in a realistic scenario: a design for an ART-CVT that matches the requirements of a low-power wind turbine coupled with a synchronous generator directly connected to the grid without additional power converters. The achieved results show that an ART-CVT is able to reach working conditions close to the maximum theoretical aerodynamic performance without any active regulation.

A passively regulated full-toroidal continuously variable transmission / Milazzo, M.; Moretti, G.; Burchianti, A.; Mazzini, D.; Oddo, C. M.; Stefanini, C.; Fontana, M.. - In: MECCANICA. - ISSN 0025-6455. - 55:1(2020), pp. 211-226. [10.1007/s11012-019-01096-y]

A passively regulated full-toroidal continuously variable transmission

Moretti G.;Fontana M.
2020-01-01

Abstract

This work presents a novel self-regulated toroidal continuously variable transmission (ART-CVT) that features a passive control of the speed ratio, achieved with no need for supplementary actuation system. The proposed transmission system is based on a full-toroidal CVT topology which combines a specially shaped geometry of the conjugate profiles with a pre-load system to create a correlation between the speed ratio and the input torque. Such a solution is conceived to reduce the complexity that is usually associated with active regulated systems and it is envisaged to be applicable to low-power/low-cost systems such as small wind turbines, powered-two-wheelers, or bicycles. We illustrate a simplified mathematical model that is able to describe the response of the proposed ART-CVT in quasi-static steady-state operational conditions. Additionally, we propose a case-study in a realistic scenario: a design for an ART-CVT that matches the requirements of a low-power wind turbine coupled with a synchronous generator directly connected to the grid without additional power converters. The achieved results show that an ART-CVT is able to reach working conditions close to the maximum theoretical aerodynamic performance without any active regulation.
2020
1
Milazzo, M.; Moretti, G.; Burchianti, A.; Mazzini, D.; Oddo, C. M.; Stefanini, C.; Fontana, M.
A passively regulated full-toroidal continuously variable transmission / Milazzo, M.; Moretti, G.; Burchianti, A.; Mazzini, D.; Oddo, C. M.; Stefanini, C.; Fontana, M.. - In: MECCANICA. - ISSN 0025-6455. - 55:1(2020), pp. 211-226. [10.1007/s11012-019-01096-y]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/255829
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