Types of Perpetual Motion Machines

Perpetual motion machines (which don’t exist) come in many forms.

Perpetual motion machines of the first kind violate the First Law of Thermodynamics. They produce mechanical work (i.e. movement) without any energy being input; this violates the principle of the conservation of energy.

Perpetual motion machines of the second kind violate the Second Law of Thermodynamics. They convert thermal energy directly into mechanical work, with no exhaust heat being emitted; this violates the rule of the production of entropy, that entropy in a system must always increase.

Perpetual motion machines of the third kind do not, as their name suggests, violate the Third Law of Thermodynamics. Rather they claim to maintain motion (once started) forever, and do so by assuming that frictional forces can be eliminated completely (often through operating in a perfect vacuum, which is also not possible).


10 thoughts on “Types of Perpetual Motion Machines

  1. A field-emission diode can rectify thermal noise from a resistor. So perpetual motion machines of the second kind are possible. htg@example.com

  2. Interesting I like to try out magnetic fields to create movements perpexual lying in its fields

  3. Albert Einstien says for every action there is a oposite or equil reaction.! So magnetic fields do exist… Just matter how we can use this to our advantage. In a device that would propel a fusalodge or craft…

  4. Nincumpoops here in the US the patent office won’t even consider an invention that violates the most sacred laws of thermodynamics

  5. I’ve always viewed electricity as a superfluid. As such it has special characteristics, not completely analogous to other phenomena like springs and masses, or pneumatic compression, or hydrolics. An induced magnetic field will continue to push electrons into a capacitor even after voltage has been neutralized making oscillators possible, allowing a higher voltage to be developed than the original input. I contend that the planets and atoms are PMMs of the first order having already evinced longevity with no sign of slowing down any time soon.

  6. PMMs of the third kind must be the goal… to extract usable energy without diminishing the system of the PMM. In order for one such to work it must have a way to at least regulate its own function, probably even its internal power. And to keep this separate from that externally available.

  7. Planets are measurably slowing down. I don’t understand how an atom can be considered to be a machine.

  8. Those that are “seriously” into creating such machines make the distinction between a device that can run forever (PMM) but will inevitably slow down the instant you try extract any useful work from it and what they call an “Over Unity Device” which generates more power out than is required to keep it going.

    It only takes one second of thought to realise that such a device is impossible because if it were to feed itself the power output would soon increase to infinity.

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