Can one power a single motor with two different RF sources?
I'm not looking to do this practically. I'm a student and need help with a theoretical circuit I'm drawing.It doesn't matter. It's too inefficient to be practical. Plus, the power levels required to drive even a tiny motor would be to even look in at, let alone be around.
I know it's terribly inefficient, but as a student trying to design a theoretical circuit I'm just trying to see if it's possible, and maybe some of the reasons why, or why not - aside from that it's inefficient. Thanks!Generating RF to drive a motor is a seriously bad inefficient idea.
Well that really is the issue. Saying something is wildly inefficient is another way of saying something produces a lot heat and needs to be really massive (and expensive) for the tiny amounts of useful power you can get from it. In this case, there's also the safety issue because RF leaks and scatters everywhere and those power levels it's dangerous to be around.I know it's terribly inefficient, but as a student trying to design a theoretical circuit I'm just trying to see if it's possible, and maybe some of the reasons why, or why not - aside from that it's inefficient. Thanks!
OK, let us try and channel your thinking.as a student trying to design a theoretical circuit I'm just trying to see if it's possible, and maybe some of the reasons why, or why not
A more recent example is Xenosaga. It's used to broadcast power to all the mechas from their ship that carries them. They still get their ass whupped by ships that basically draw their power from higher spatial dimensions.A great many SciFi stories utilise beamed wireless power, it's a common story line.
A classic example is Spacehounds of IPC by E.E. Doc Smith
Yes that helps a lot thank you!OK, let us try and channel your thinking.
1 How much power does the motor require?
Without knowing this, all other considerations are moot.
2 What range do you anticipate between the RF transmitter and the RF receiver?
As mentioned else where, if you are relying on true electro-magnetic coupling, the inverse square law applies.
ie as you double the distance between tx and rx, so the received energy drops by a factor of four ( ie 2 squared).
If you are relying on magnetic coupling, you start to encounter an inverse cube law.
3 What frequency do you plan to use?
A higher frequency would allow the use of directional antennas, radiating the RF energy in the required direction. This would improve the range, but the inverse square law still applies.
Also don't forget that you cannot just park a great big transmitter on any frequency you like. You are likely to make the existing users of that frequency very angry.
4 While on the subject of frequency.
It is fairly easy to rectify RF power up to a few 10s of kilohertz, just use the same sort of diodes as used in switchmode power supplies.
But when you get into the MHz region, rectifying significant amounts of power becomes more difficult.
You my be able to use an active rectifier scheme...
Who knows. It all depends on the amount of power you need to rectify.
So, does that help with your theoretical study?