Perpetual energy usually refers to the idea of a device that can continuously produce energy without requiring an external energy supply. This concept is often associated with a perpetual motion machine, a machine that can run forever and even produce more energy than it consumes.
However, based on the current understanding of modern physics, a perpetual motion machine has never been successfully built and is considered impossible according to the laws of thermodynamics.
History of the Perpetual Energy Concept
Since the Middle Ages, many inventors have attempted to create machines that can rotate or run indefinitely. Some famous designs include:
A wheel with an unbalanced weight, a water wheel using permanent magnets, a system of wheels and fluids that claimed to be self-pumping, and a gravity machine that utilized mass transfer. Many of these inventions captured public attention because they promised an unlimited source of energy. However, after scientific testing, all of them failed to produce clean energy continuously.
Classification of Perpetual Motion Machines
Perpetual Motion Machines: The First Type
This machine claimed to produce more energy than it input.
Examples include generators that produce electricity without a power source. Motors that continuously rotate and produce electricity without losing energy. Such machines violate the First Law of Thermodynamics, namely the law of conservation of energy.
Mathematically:
Illustration of a magnetic perpetual-motion concept intended to achieve continuous rotation through magnetic interactions.
Energy Output > Energy Input
This is impossible because energy cannot be created from nothing.
Perpetual Motion Machine Type Two
This machine attempts to convert all heat energy into mechanical work without any energy loss. This machine violates the Second Law of Thermodynamics, which states that every real process always experiences an increase in entropy and a loss of usable energy. For example, a machine that takes heat from the surrounding air and converts it all into electricity without any waste heat.
Perpetual Motion Machine Type Three
This machine aims to eliminate all friction and resistance so that it can move forever. In practice, there is always friction. There is always air loss, and there is always material loss.
Therefore, no real system is completely free of energy loss.
Why Can't a Perpetual Motion Machine Be Built?
Friction in bearings, shafts, gears, and other mechanical components. Friction converts mechanical energy into heat. Furthermore, objects moving through the air experience drag. Kinetic energy is slowly converted to heat in the surrounding air. Electrical losses in generators and electric motors include copper losses, iron core losses, hysteresis losses, and eddy current losses. The best efficiency of modern generators is generally around 95–99%, but never 100%.
Examples of Common Perpetual Energy Claims
Permanent Magnet Generator
Many videos on the internet show generators that use only permanent magnets. The claimed principle is that the magnets attract the rotor.
The rotor continues to rotate.
The generator produces electricity continuously. The problem is that magnets can provide force, but they do not produce unlimited energy. To maintain rotation and produce output power, energy from another source is still required. A magnetic perpetual energy system is a concept that attempts to utilize the attractive and repulsive forces of permanent magnets to maintain continuous motion without requiring an external power source. In many proposed designs, magnets are strategically arranged around a rotating wheel or rotor so that magnetic interactions generate torque and keep the rotor spinning. The underlying idea is that the magnetic forces provide a constant driving effect capable of overcoming friction and other energy losses.
Proponents of magnetic perpetual energy devices often suggest that a carefully designed magnetic configuration can create an imbalance of forces, resulting in sustained rotation and continuous energy production. Such systems are frequently referred to as free-energy machines because they are intended to operate indefinitely once started. Various designs have been proposed, including magnetic wheels, magnetic motors, and hybrid systems that combine magnets with mechanical linkages.
From a scientific perspective, however, permanent magnets do not create energy; they only exert forces that can transfer or store energy within a system. According to the laws of thermodynamics and the principle of energy conservation, a machine cannot continuously produce useful energy without an external energy input. Friction, air resistance, magnetic hysteresis, and other losses eventually dissipate the available mechanical energy, causing the motion to slow down and stop. Consequently, no magnetic perpetual motion machine has been demonstrated to operate indefinitely while delivering net energy output.
Nevertheless, magnetic perpetual energy concepts continue to attract interest among inventors, researchers, and enthusiasts because they provide an intriguing platform for studying magnetism, force interactions, rotational dynamics, and innovative mechanical designs.
Magnetic Motor
This motor uses an arrangement of magnets designed to keep the rotor constantly pushed. In a complete physical analysis, the magnetic force accelerating the rotor is balanced by the resisting force on other parts of the path.
As a result, the rotor does not generate net energy.
Self-Running Generator
Typically consists of an electric motor, generator, and battery. The generator is used to recharge the battery that powers the motor. The problem is that the total efficiency is always less than 100%. For example,
ηmotor = 90%
ηgenerator = 90%
then
ηtotal = 0.9×0.9=0.81
This means that only 81% of the energy is returned, so the system eventually stops.
Are There Any Systems That Almost Appear Perpetual?
Satellites in Orbit
The International Space Station can orbit Earth for years. However, it still requires orbital corrections. It uses energy from solar panels. It doesn't generate energy from nothing.
Precision Mechanical Clocks
Some clocks can run for years. For example, clocks obtain energy from temperature changes, air pressure changes, and environmental vibrations. However, the energy still comes from the environment.
Superconductors
At very low temperatures, electric current can flow with very little loss. However, the energy is not increased. It takes a large amount of energy to maintain cryogenic temperatures.
Technologies Often Mistaken for Perpetual Energy
Solar Energy
Solar panels appear to produce energy without fuel, but their energy source is the Sun.
Wind Energy
Wind turbines harness the kinetic energy of the atmosphere.
Water Energy
Hydroelectric power plants utilize the hydrological cycle driven by the Sun.
Geothermal Energy
Utilizes the Earth's internal heat.
Nuclear Energy
Nuclear reactors utilize the binding energy of atomic nuclei. Examples include the Chernobyl Nuclear Power Plant and the Fukushima Daiichi Nuclear Power Plant. The energy produced is enormous, but it still comes from nuclear fuel, not from a perpetual motion machine.
Current Scientific Perspective
For more than two centuries, thousands of perpetual motion machine designs have been proposed. None have passed independent scientific testing and produced more energy than they input. Therefore, the scientific and engineering communities currently consider a perpetual motion machine that produces energy from nothing to be impossible. Every real system always has energy losses. All energy sources used by humans come from identifiable physical sources, such as the Sun, gravity, chemical reactions, nuclear reactions, or geothermal heat.
For a mechanical engineering researcher, the concept of perpetual energy remains interesting to study because it helps understand the basic principles of energy conservation, machine dynamics, friction, vibration, mechanical efficiency, electromagnetism, and thermodynamics. In fact, many modern engineering advances stem from efforts to improve system efficiency, although they can never achieve a truly "eternal energy" state.
Adapted from various sources
Dr. -Ing. Salman, ST., MSc.
Lecturer in the Department of Mechanical Engineering, University of Mataram
