Torque to weight radio matters in the context of aircraft, not because aircraft demand torque more torque than other classes of vehicles (obviously not true), but because aircraft generally operate in a very narrow powerband once they’re cruising. And in the context of planes, thermal efficiency is actually really what controls the design process (though like many engineering endeavours, its very complicated). First torque to weight ratio does not matter for energy transfer, power to weight ratio does. It only talks about axial motors for the first three minutes, and nearly everything it stated on the topic was incorrect, and everything after that is just generally describing the process of synchronous three phase AC motor power delivery (which can be applied to literally any motor configuration). I don’t subscribe to that channel that posted this video, but youtube did serve it to my feed, and I watch about 5 minutes into it before I couldn’t handle how blatantly silly it was. One good way to spot this is if the creator actually lists their references–I’m not even asking for scholarly peer reviewed references, but just any reference at all so I can see where they’re getting their information and evaluate it on its own merit. And even independent of this, it is very common for science youtube to absolutely butcher scientific concepts that require a lot of nuance and deep understanding they often turn into the kind of non-vetted pseudoscience that result in more unfounded scientific myths than they actually solve. I have a lot of respect for science youtubers–they really do work their behinds off to provide interesting content that promotes science to the masses, but this was a particularly low effort video. If you do happen to care about the science, I have a phd in mechanical engineering (degree specialties in robotics and electrodynamics), and I can tell you this video Lesics posted on axial flux motors is just blatantly incorrect. A more optimized motor should have a mechanism to twist the commutator according to measurement, or an extra set of field coils that can be energized to cancel the twist. Nothing is adjusted according to conditions by the motor itself. This fixed manual adjustment doesn’t do away with the need to monitor and adjust phases – it simply trades off efficiency and longevity by having no control system whatsoever. That’s what the guy is doing in the video. but not for vehicles or lifting machines and others with variable loads. You pick the good operating point and assume the motor always runs that way – which if fine for pumps and fans etc. Any fixed brush motor can only be optimized to run well in one direction at one speed and/or torque condition. The trouble is that the magnetic field inside the motor twists as it reacts with the applied current, so the timing should change depending on the load condition. >the control system is built into the designīrushed DC motors need the commutation timing to be variable depending on the speed and torque. Posted in Transportation Hacks Tagged axial flux, axial flux motor, electric vehicle, ev, motor Post navigation We’ve seen plenty of PCB motors and most of those are axial in design. Usually, the impetus for using an axial flux motor is the ease of construction, but with the right design, they can be quite efficient (up to 96% according to the video). The Lynch motor, for example, is a type of axial flux motor that dates back to 1979. While these are not very common, they do exist even today. There’s more to it than just that of course, and the video below has nice animations showing how it all works. In the axial system, the flux lines are parallel to the axis of rotation. The simple explanation is that in a radial system, the magnetic flux lines are perpendicular to the axis of rotation. Soon, though, radial flux generators and motors became the norm. The reason this is actually something old is that the early generators built by Faraday were actually of the axial flux type. These are promising for electric vehicles, especially aircraft, since the motors should have high torque to weight ratio. In the everything old is new again folder, has a good overview of axial flux motors.
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