Since last month, Renault has enriched the range, which presents some innovations in the work of the electric Renault Mégane. We are at the fourth episode, which evokes 2 patents used for a wound rotor motor.
In total, there are more than 300 patents around the design Renault Megane E-Tech and its CMF-EV platform developed in alliance with Nissan and Mitsubishi. Launched on the market from the beginning of this year 2022, this electric car can receive one of 2 NMC lithium-ion batteries with an energy capacity of 40 or 60 kWh.
The kit is powered by a 96 or 160 kW (130 or 220 hp) engine. She is the subject of the fourth episode of the series. We learn that the cooling of the wound rotor motor manufactured in France at the Cléon plant (76) is based on patents FR304350 and FR3059487.
It’s about keeping the device at an optimal temperature so that even with intensive use, it maintains all its performance in all situations.
Compact but very powerful engine
” The first of these patents covers the oil cooling system of our wound rotor synchronous motor. We installed injectors in strategic locations to spray the wound rotor electric motor while simultaneously cooling the rotor and stator explains Fabrice Bernardin, head of the electronic technology work unit in Renault’s design department.
” The second patented innovation concerns a clever technique that allows us to use the momentum of the rotor using a ring gear system to emphasize stator cooling by spraying oil towards the heads. “, he continues.
The main benefit of these two innovations lies in the compactness of the electric motor, which still maintains its power and torque. Its weight has been reduced by a third compared to the previous generation. This has a positive effect on efficiency.
No rare earths
In total, Renault intends to compile 7 episodes to explain the innovations brought to the world of electric vehicles by the work on the Mégane E-Tech. The previous one related to the absence of rare earths in this wound rotor motor (patent FR3106243).
Edouard Nègre, responsible for the design of these electrical devices in the Renault Powertrain Design department, explained: “ We have invented a process for winding a rotor without a magnet. The magnet has been replaced with copper, which has a much smaller impact on the environment “.
He continued: ” The patented process also makes it possible to modulate the current passing through the rotor to reduce the electrical consumption of the battery, especially at high speed and on the highway. “.