Latest news with #I2SM
Top Gear
7 days ago
- Automotive
- Top Gear
ZF has a new EV powertrain that promises a 30 per cent winter range improvement
Electric The Select modular e-drive platform has a magnet-free motor and better heat-managing smarts Skip 2 photos in the image carousel and continue reading Vehicle tech supplier ZF has created a modular e-drive powertrain that it says gives electric cars up to 30 per cent more range in extreme cold conditions. How so? The Select modular system – to give the thing its official name – combines electric motors, converters, inverters, transmission and the software package needed to optimise electron-fuelled propulsion, though the company says all the components are interchangeable. Advertisement - Page continues below The not-so-secret sauce is a magnet-free motor (I2SM, for the nerds), which ditches the permanent magnets in favour of a slimmer, lighter setup that saves five kilos and fits into tighter spaces. According to ZF, it chucks out up to 300kW (402bhp in old money), and generates a silly 4,057lb ft of torque. And it's slicing energy losses by more than 25 per cent at motorway speeds. Using something it calls 'TherMaS' - a compact, propane-based heat pump refrigeration circuit, rather than a pricey Scandinavian spa treatment – the German engineers have been able to extend range through heat management efficiency. You might like The results? At a nippy -7°C, you get 15 per cent more range compared to current systems. At a nose-freezing -25°C, you're looking at up to 30 per cent more – which sounds pretty game-changing if you're based in the Arctic Circle. The multi-tasking design uses the inspirational 'X-in-1' (akin to your favourite shampoo) but by utilising power supply and battery for different things, there are fewer components contributing to those lightweighting gains. New innovations to the gearing, inverter and converter which among other attributes enable bi-directional charging, too. Advertisement - Page continues below ZF also acknowledges that there's still a place for hybrids – set to be around for a few more years than first expected – so it has upgraded its eight-speed automatic transmission to be deployed in any kind of hybrid, not just mild and plug-in as it once was. Plus, there's that new generation of range extenders it's been working, too. Thank you for subscribing to our newsletter. Look out for your regular round-up of news, reviews and offers in your inbox. Get all the latest news, reviews and exclusives, direct to your inbox.
Yahoo
19-03-2025
- Automotive
- Yahoo
How firms are putting a new spin on EV motor tech
The problems associated with rare and difficult-to-obtain materials – as used in motors that power electric cars as well as batteries – provide a good reason for focusing on recycling and finding alternatives. Most EVs have permanent magnet synchronous motors (PMSMs), where the rotor has permanent magnets embedded in it that are attracted to a rotating magnetic field generated using power from the battery. Magnets made from rare earth elements (REEs) are far more powerful than any other kind but raise the question of economic security. (China dominates the market for rare earth elements, with 70-80% of the supply.) A project established in 2019 with the hefty title Sustainable Recovery, Reprocessing and Reuse of Rare-Earth Magnets in a European Circular Economy is aiming to make the process more effective. Nineteen European partners are involved, including ZF, which is evaluating recycled REEs for use in new motors and developing designs that make electric motors easier to recycle. These powerful magnets are tricky to separate from the rotor and they break up into a magnetised powder that sticks to other ferrous scrap. But a new method called hydrogen processing of magnet scrap (HPMS), developed at Birmingham University, produces a non-magnetic, reusable powder without removing magnets from the rotor first. The rare earth-rich powder can be reprocessed into new magnets while avoiding traditional energy-intensive methods, so the energy used to produce magnets is 12% of that needed to make them from virgin material. ZF has built and tested motors made using HPMS and found the performance of the magnets was almost identical to those manufactured using freshly mined materials. Another way of reducing the need for virgin REEs is not to use permanent magnets at all. Externally, or separately, excited synchronous motors replace the permanent magnets in the rotors with electromagnetic windings and have been used by Renault since the launch of the Zoe in 2012. Feeding an electric current from the outside of the motor into the rotating core involves the use of brushes so the motor isn't 'brushless' like a PMSM. One alternative that avoids the use of brushes is ZF's I2SM (in-rotor inductive excited synchronous motor). This has a small electronic generator called an inductive exciter, uniquely fitting inside the rotor shaft rather than on the end, which makes the motor longer. It works on the same principle as wirelessly charging a car or mobile phone, generating current that in turn is used to create a magnetic field in the rotor. ZF claims the same power and torque density as a PMSM equivalent and the motor also fits into a similar space, making it easier for car manufacturers using PMSMs to make the switch. ]]>
