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Eurobike 2017

Rear-wheel drive for pedelecs

Published 2017-09-06

Go Swissdrive has launched a CAN-connectable rear-wheel drive for pedelecs. It is compatible with the CAN hub by Cobi.

Rear-wheel drives are more silent than the mid-mounted motors (Photo: Go Swissdrive)

Following the trend towards mid-mounted motors in the past few years, more and more manufacturers as well as users are currently rediscovering rear-wheel drives. Under the motto “Silent e-Motion,” the Swiss company, has presented for the first time models using its e-bike drive system at the Eurobike 2017 trade fair in Friedrichshafen (Germany). Feature include the low resistance technology, which minimizes pedal resistance above 25 km/h, the hill descent control with a recuperation output of 200 W, and energy recovery starting automatically at a pre-set speed. Additionally, the drive provides a boost function, which allows getting full performance temporarily at any support level and from recuperation, as well as thermal management for better performance. E-bike and pedelec users now have the possibility of customizing riding profiles and motor configurations via the Swiss manufacturer’s smartphone app. The product can be connected via Cobi’s bike system and Bluetooth to a smartphone.

“Switching our motor control to the extremely fast CAN network, which is also used by the automotive industry, has given us some really new possibilities,” said Immanuel Seeger from the Swiss company. “The switch to the new controller does not just open up new possibilities, such as a descent control system; we have also been able to significantly increase maximum energy recovery to more than 200 watts,” he added.

Look into the rear-wheel drive: The control electronic provides a CAN interface (Photo: Go Swissdrive)

The hill descent control system can be custom-adjusted by the rider. In descent control mode, a push of a button makes the motor start to recuperate above a pre-selected maximum speed. In other words, it decelerates gradually at the same time as recovering energy, rather like an alternator. Below the set speed, the electronics automatically switch the recuperation off again. In practice this results in a gain in safety, comfort and range for those riders who prefer to engage long descents at lower speeds. A further benefit is the reduced wear on the brakes.

In order to access maximum power, e.g. at traffic lights or on sudden upward inclines, there is now also a so-called boost function. A press of the thumb gives access to full power. Because the drive acts directly on the rear wheel hub, there is no increase in material wear even on full power, unlike with central motors. There is no wear to the motor itself, or indeed the drive train, i.e. chain, and pinions. To increase continuous power on hills, the supplier has developed a thermal management system. Sensors continuously monitor motor temperature and adjust it to the current performance. Flat spots on hills are thus systematically avoided by means of the new electronics.

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