Solar PV is the most common power generation method in space, and chemical batteries are the most common power storage method in space. Let's discuss other possible means of generating and storing power for spacecraft and their payloads.
Search on "converters" used to get AC from DC by driving the AC generator with a DC motor on the same shaft, and significantly, they by tradition had equal torque-arms to the air-gap or neary so, if you extend the torque-arm of the motor it can give the same output with less wattage by the motor:generator ratio, a Class 2 lever with load and resistance on the same side of the fulcrum.
This principle Is used in the human body all over as Class 2 levers are "force mutipliers" so for us with constraints can supply continuos power, the ace.in.the.hole for Coral from an existing high TRL makers to just throw together one from OTS models to vet them, as a non-priorty favor I asked my DELMIA sales guy may get a bid on that for the certainty alone, I'd like to pay him.
How you order for a custom version is 100 on the 1st run means one gets no mistakes, asking for pricing per 1000 has them create a new assembly line.
Details & calculations available, they'll sell out
I have a few questions coming from reading your document here, and specifically this excerpt from it
Can you walk me through the derivation of how the power (Watts) indicated creates torque? It looks like you may have applied the Lorentz force but it would help me to see the steps written out. If you can clarify which units should accompany the indicated
20.00 that would help as well.
Second: you wrote down the equation KE = 1/2 * I * omega^2 , where I is the moment of inertia and omega is angular velocity. Since the two rings/disks are on the same shaft, what's the actual total moment of inertia for the combination of shaft, inner ring, and outer ring? I didn't see a calc for it but I may have missed it.
I also see 1250 Watts and 1350 Watts indicated as what looks like force vectors acting at the outer and inner rings respectively. What's the source of the power at each of these locations, and are the arrows meant to indicate what look like opposite directions? Please also help me see the relationship between the wattage, torque, and angular velocity in that diagram with some math steps.
This is a 3rd try, it keeps closing trying to attach a drawing, the 1350w is 1000w to drive the 4kw generator, 250w is feedback to the motor, 100w is for losses this makes the feedback motor independant of the usage, pumps etc.
KE is arm length times force, the motor must equal the output after losses.
www.kjmagnetics.com/calcultor.asp click repulsion, it returns lbf & gauss, mY blocks are 7x4x3mm and put out over a pound, these are empirically derived.
The 81mm cuts 80 Tesla/rev using Nd 40s, 240rpm gives 28v, 27A.
Here are a few alternatives that I can think of
For power generation:
A focusing mirror heats a fluid in either a liquid metal Rankine cycle or a gas Brayton cycle. It hasn’t been developed much because in involves moving parts which are assumed to make it unreliable without maintenance. Efficiency isn’t great in the liquid metal Rankine cycle, and turbines for the Brayton cycle need to be engineered to very high tolerances to operate efficiently, but solar-thermal does scale up very well since mirrors can be made much less expensively than PV panels, and a relatively small Brayton cycle turbine can handle a lot of power.
The technology for space nuclear power at the kilowatt level has been around since the 60’s, but is problematic for political/regulatory reasons. The technological barrier to scaling up space fission reactors is the development of reactors operating at very high temperatures, like gas-cooled, sodium-cooled, or molten salt-cooled reactors, which could have very high power density. High temperatures allow the crucial heat radiators to work much more efficiently.
Power is beamed to a spacecraft from a space station or surface base, or from the ground in some cases. There are loads of ideas on how to do this. I’ll list a few here:
Laser beams converted into electricity by photovoltaics.
Microwave beams converted into electricity by rectenna arrays.
Neutral particle beams converted into electricity by traveling-wave direct energy converters.
For energy storage:
Hydrogen-Oxygen fuel cells can be scaled up to the megawatt level, but have issues with the lifetime of electrodes, similarly to chemical batteries.
Also can be scaled up to the megawatt level. I don’t know of any major drawbacks besides that their gyroscopic effects can cause issues with attitude control.
Can store electrical energy as orbital kinetic energy, but only in places where there are strong planetary magnetic fields. Tens of kilowatts of power input/output is probably doable with a tether weighing around a ton.