At the Varroc Engineering booth at the New Delhi Auto Expo in February 2020, the one exhibit that stood out among many others, was its concept electric scooter
It is pertinent to note that although Varroc showcased the concept electric scooter, the company does not have any plans at present to develop and launch an e-scooter. They want to continue to offer modular solutions for EV manufacturers.
The frame of the scooter has been borrowed from a 110 cc petrol scooter (Hero), and the battery is from an external source, which we were not able to confirm independently. Every other component has been developed indigenously by Varroc, including traction motor, motor controller, DC-DC converter, 5-inch TFT instrument cluster with turn-by-turn navigation, headlight & taillight, sequential blinkers, switches & joystick, USB mobile charging port and body panels for the entire vehicle, including the seat.
Let’s look at these in some more details:
Traction Motor & Controller:
The global Tier 1 major claims the traction motor and controller has industry-leading efficiency levels of 93 % and 98 % respectively. The air cooled design of the traction motor and controller has high power density and regenerative braking for improved vehicle range. In addition, the compact dimensions allow Ingress Protection rating of IP67 for the traction motor and IP65 for the controller, making them ready to ride in any weather conditions. It also features selectable riding modes such as Eco, Cruise, Sports and Reverse. The Permanent Magnet Synchronous Motor has a 48 V DC bus with 3 kW of nominal power, peaking at 5 kW and a peak torque of 20 Nm. It can generate top speed of 6,500 rpm and a base speed of 2,400 rpm. The motor is 170 mm in length and weighs 7.5 kg.
The DC-DC converter is a scalable design with 10 A and 20 A variants, and used to convert 48 V to 12 V for powering auxiliary loads in the EV. The converter has a peak efficiency of 95 % at full load and is protected for fault conditions such as input over- and under-voltage, output short circuit and over temperature, among others. The DC-DC converter used in the concept scooter has an Ingress Protection rating of IP68 with natural air cooling, and an input voltage range of 36-60 V.
5-inch TFT Display “Uranus-EV”:
The instrument cluster with turn-by-turn navigation is flexible, and features easily available driver assistance information. Users can personalise the display owing to the flexible configuration of the unit. It allows connectivity with mobile phones, and uses high-resolution graphics for animation that can be changed without any change in hardware.
Headlight, Taillight & Blinkers:
Scaled down the integrated headlight size used in the bench top design with 3 D-Lens – two for LB and one for HB functions. A single common driver has been used for HB, LB, blinker and cluster functions. The taillight has been given a unique design with milky lens and stop function with pillow optics. A single common driver is used for tail, stop and rear blinker functions. The sequential indicator is integrated with the handlebar, and a single common driver used for all the functions, including LB, HB, DRL, sequential blinkers and cluster.
USB Charger Type A:
The USB charger on the concept scooter comes with a Type A connector, which is suitable for all the mass market mobile phones. An innovative rotary opening and closing mechanism has been used for the USB unit, which comes with surrounding illumination for better night visibility. The unit is also capable of automatically detecting the USB protocol, as per the connected smartphone.
The concept scooter also gets a slew of polymer products, including the seat assembly and body panels. Body panels include front cowl, front horn panel, front body, front mudguard, back panel, floor panel, foot rest panel, seat bottom panel, rear side panel, back neck panel, fender rear cover and mobile holder.