Swedish automotive manufacturer Koenigsegg has developed a new electric motor called Quark that utilizes a torque/power-rich balance between radial and axial flux topology dubbed Raxial Flux. Further, Koenigsegg has integrated two Quark e-motors with its recently introduced 6-phase inverter David, plus planetary gear sets, in order to create the Terrier, a torque vectoring EV-drive unit.
Quark Electric Motor with Novel Raxial Flux Topology
The Quark E-motor relooks at the fundamentals of magnetism, materials, cooling and packaging instead of following the norm, hence its name. The Quark elementary particle experience all four fundamental forces (electromagnetism, gravitation, strong interaction, and weak interaction).
The mixing of radial and axial flux layout enables the best torque to power to weight ratio in the industry, a company statement claimed.
Leading this development is Electric Motor Design Lead Dragos-Mihai Postariu who comments: “The Quark is designed to bolster the low-speed range of the Gemera (4 seater, plugin hybrid, limited production hypercar by Koenigsegg), where you need it, for brutal acceleration. The ICE then focuses on the high-speed range. What this means in terms of performance for the Gemera is a big power surge followed by a continuous record-speed push to 400 km/h without any torque or power losses.”
“The Quark is unique in its high efficiency in combination with its class-leading torque-to-power-to-rpm-to-weight matrix. This means, when using the Quark in applications such as marine, aircraft or VTOL, there is no need for a step-down transmission, instead direct drive can be achieved, as the RPM of the motor is right from the get-go. Small high-revving motors can have higher peak power to weight ratio, but they need transmissions in most applications in order to get to the desired output rpm and torque, causing energy loss and adding weight and complexity to do the same job. So any benefit in size is lost. In other cases, like the Terrier application, the transmissions can be reduced in size and complexity compared to higher-revving, less torque dense motors, which is also a big win. I guess we’re trying to reach the edge of optimal in-betweeness,” adds CEO and Founder Christian von Koenigsegg.
The Terrier EV Drive Unit
The launch of the Quark E-motor, in parallel with the recently unveiled David inverter, enabled Koenigsegg to create torque vectoring drive unit for the EV industry – The Terrier. The electric drive unit is made from two Quark e-motors and a David Inverter.
The Terrier needs one inverter (instead of two), as David’s 6-phase lends 3 phases to each Quark, thereby reducing weight, size and components. Furthermore, given the Quark’s flat packaging, David can neatly slot between two Quarks to create a square dense package. Finally, as the Quarks give massive power and torque at reasonable RPMs, only small low-ratio highly efficient planetary gear sets are needed at each output. The compact packaging allows the Terrier to be elasto-bolted to the monocoque or chassis directly.
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