| ▲ | chinathrow 10 hours ago |
| Click "More" and scroll down: "In contrast to conventional radial flux motors, the electromagnetic flux in an axial flux motor runs parallel to the axis of rotation. The key components are arranged in a disc‑shaped layout: two rotors sandwich the stator from the left and right. This design enables an especially compact motor architecture, high power and torque density, and new freedoms in drivetrain packaging. In the new Mercedes‑AMG GT 4‑Door Coupe, the motor at the front axle is just under nine centimetres wide; the two motors at the rear axle each measure around eight centimetres in width. The three axial flux motors are integrated per axle into so‑called High Performance Electric Drive Units (HP.EDU), where they are combined with a compact input planetary gearbox in a single housing." |
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| ▲ | giancarlostoro 8 hours ago | parent | next [-] |
| Really the kind of thing that should be earlier in an article about… that very thing the reader is wondering about, but maybe we arent the target audience? |
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| ▲ | swiftcoder 8 hours ago | parent | prev | next [-] |
| This is the same design that enables the PCB Stator Motors, right? |
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| ▲ | klaff 4 hours ago | parent | next [-] | | Yes. If you have a laser printer, that windup sound you hear at the start of a job is the polygon mirror motor spinning up thousands of RPMs - those are PCB stator motors. As were VCR head motors. | |
| ▲ | utopiah 6 hours ago | parent | prev [-] | | "Advantages : A motor can be built upon any flat structure, such as a PCB, by adding coils and a bearing." https://en.wikipedia.org/wiki/Axial_flux_motor with image of "A miniature DC brushless axial motor used in a Digital Data Storage drive, showing the integration with PCB construction techniques." |
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| ▲ | phyzix5761 6 hours ago | parent | prev | next [-] |
| For some reason that reminds me of https://www.youtube.com/watch?v=aW2LvQUcwqc |
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| ▲ | engineer_22 6 hours ago | parent | prev | next [-] |
| > This design enables an especially compact motor architecture, high power and torque density, and new freedoms in drivetrain packaging. Hand waving. |
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| ▲ | 0-_-0 6 hours ago | parent [-] | | No, it means the motor is smaller and it can be put into the wheel | | |
| ▲ | klaff 4 hours ago | parent | next [-] | | It doesn't make that a good idea. Armature losses are proportional to torque squared - doesn't matter if it is radial or axial design. That's why all the EVs today have gear boxes with ratios like 13:1. Get rid of that gearbox and the steady-state losses go up with the square of that ratio. Then there are the issues of sprung mass, and where to put the mechanical brakes. | | |
| ▲ | zardo 2 hours ago | parent | next [-] | | YASA claims their integrated brake/wheel motor is lighter than comparable (supercar) disc brake systems. | |
| ▲ | ed_balls 2 hours ago | parent | prev [-] | | >gear boxes with ratios like 13:1. you add planetary gears >sprung mass you can integrate all into one hub (breaks, bearings, gears etc) and it weights pretty much the same. what you gain is more space for a bigger battery, torque vectoring, no loss on diff and CVs |
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| ▲ | MostlyStable 5 hours ago | parent | prev [-] | | aren't there other issues with having the motor in the wheels? Unsprung mass, plus the wheels can get pretty banged around? | | |
| ▲ | parineum 38 minutes ago | parent [-] | | You could add a short drive shaft behind the springs to put the motor on the car body. That'd give you some additional advantage of moving much of the brake weight off of the wheel as well. |
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| ▲ | 6 hours ago | parent | prev [-] |
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