- #1
faisal5455
- 2
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Sir what would be the life of permanent magnet motor which runs by the repulsion of north pols. Is magnets energy wasted during this repulsion process or not. Because it continuously work on repulsion of two north pols.
Permanent magnet motor working on repulsion force
- Thread starter faisal5455
- Start date
In summary, the conversation discusses the concept of a permanent magnet motor that runs by the repulsion of north poles. The energy used to bring the poles together will be more than the work extracted from them, resulting in conversion of motion into heat. The discussion also mentions the impossibility of perpetual motion machines and the PF's rule against discussing them.
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- #3
faisal5455
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diagram
- #4
abitslow
- 140
- 14
Two (or more) North Poles will exert a repulsion on each other. This repulsive force can be converted into useful work. The amount of energy used to bring the two poles together will be MORE than the amount of work extracted from them. That is, you will be converting motion (generated externally) into heat. There is no such thing as a perpetual motion machine.
The diagram you added shows NO moving parts. If I assume that the two disks are spinning on the shaft, then the bearing surface will wear, but the amount of wear per revolution obviously depends on the materials of construction. The two disks will quickly stop, converting most of the energy you used to start them spinning into heat (friction) but some into electromagnetic waves.
To repeat the obvious, what ever energy you use to spin the disks will be only partially converted into movement of the shaft (if the shaft is also rotating). There is no such thing as a perpetual motion machine.
The diagram you added shows NO moving parts. If I assume that the two disks are spinning on the shaft, then the bearing surface will wear, but the amount of wear per revolution obviously depends on the materials of construction. The two disks will quickly stop, converting most of the energy you used to start them spinning into heat (friction) but some into electromagnetic waves.
To repeat the obvious, what ever energy you use to spin the disks will be only partially converted into movement of the shaft (if the shaft is also rotating). There is no such thing as a perpetual motion machine.
Last edited:
- #5
berkeman
Mentor
- 66,994
- 19,794
faisal5455 said:
Welcome to the PF. We do not discuss perpetual motion machines (PMMs) or "free energy" here at the PF. That is in the Rules (see Site Info at the top of the page). Thread is locked.
PF Forbidden Topics said:
1. How does a permanent magnet motor work on repulsion force?
A permanent magnet motor works on the principle of repulsion force between two magnets of the same polarity. The motor consists of two magnets, one fixed and one rotating, with their north and south poles facing each other. When an electric current is passed through the fixed magnet, it creates a magnetic field that repels the rotating magnet, causing it to rotate.
2. What are the advantages of using a permanent magnet motor?
Permanent magnet motors have several advantages over traditional motors. They are more energy-efficient, have a higher power-to-weight ratio, and require less maintenance. They also have a longer lifespan and can operate at higher speeds and temperatures.
3. Are there any limitations to using a permanent magnet motor?
One limitation of permanent magnet motors is that they require a continuous power supply to maintain their magnetic field. They also have a limited torque output, which can restrict their use in certain applications. Additionally, the cost of rare-earth magnets used in these motors can be a barrier to their widespread adoption.
4. Can a permanent magnet motor be used to generate electricity?
Yes, a permanent magnet motor can be used as a generator to produce electricity. By rotating the motor, the magnetic field created by the magnets induces an electric current in a nearby coil. This principle is used in many renewable energy sources, such as wind turbines and hydroelectric power plants.
5. How do permanent magnet motors compare to other types of motors?
Compared to other types of motors, permanent magnet motors offer higher efficiency, better speed and torque control, and lower maintenance requirements. They are also more environmentally friendly as they do not require the use of fossil fuels. However, they may not be suitable for all applications due to their limitations in torque output and cost.
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