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Virtual Panel Event about Industrial Connectivity

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This 60-minute virtual panel discussion between industry experts will explore the intersection of connectivity (more)

UKIVA Machine Vision Conference



Join us on 15 July 2021 on the MVC Technology Presentation Hub and explore eight online seminar theatres. (more)

PPMA Show 2021

NEC, Birmingham(B40 1NT)

28/09/2021 - 30/09/2021

PPMA Show 2021 will be the UK’s largest ever event dedicated to state-of-the-art processing and (more)

Southern Manufacturing

Farnborough, Hants(GU14 6TQ)

06/10/2021 - 07/10/2021

Southern Manufacturing and Electronics is the most comprehensive annual industrial exhibition in the (more)

Advanced Engineering 2021

NEC Birmingham(B40 1NT)

03/11/2021 - 04/11/2021

Join us in our 12th and most important edition to date, as we invite engineers and management from all (more)

DC motors for electronic gear shift

DC motors for electronic gear shift

The EPS (electronic power shift) system from, took many years to develop. DC motors from Maxon Motor are a key component on the EPS (electronic power shift) system from bicycle component manufacturer Campagnolo, responsible for executing the shifting processes within tenths of a second.

The history of Campagnolo's EPS went through six planning phases, each resulted in important innovations, direction changes and great challenges. The cooperation with Maxon Motor commenced in 1994. Three years later, the first solution for a shift mechanism using a Maxon motor was born. After several redesigns, as well as modifications to the bicycle itself, the engineers from the Campagnolo Campy Tech Lab developed a completely new design, switching from a 10-speed to an 11-speed system.

The EPS Electronic Power Shift system consists of a rechargeable battery, electronics, shift lever, wiring and drive mechanism. The Maxon motors are used at the rear shift mechanism and at the front derailleur. The derailleur was completely redesigned to make it suitable for modern frames. The motors were adapted as well. To achieve the required maximum precision with minimum tolerances, the focus was placed on miniaturising the rear derailleur and fine-tuning the electronic calibration.

With the electronic shift system, a very high shifting accuracy, a high speed of response and the required power are achieved. This makes faster shifting possible and the position of the derailleur can be adjusted with higher accuracy than is the case with a mechanical system. Switching from the smallest to the largest sprocket requires just a single click at the shift lever. To be more precise: The electronic shift mechanism can shift through eleven gears in only 1.5 seconds.

The motors are the core of the shift system – they move the derailleur and the shift mechanism of the racing bicycle. The brushed Maxon DC motors had to be small and strong enough to provide peak power. For the EPS electronic shift system, customised DC motors, from the RE family, and gearheads are used. For the shift mechanism (at the rear), a motor with a single-stage, integrated gearhead is used. “The Maxon motor technology offers solutions that easily withstand the extreme ambient conditions encountered on racing bikes and, in combination with the extremely good performance of the small RE motors, the electronic shift system is unique on the market,” explains Marco Campagna, Group Product and Marketing Manager at Campagnolo.


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