What if the magnet does not rotate — but its field becomes visible?
Induction through a periodically released magnetic field
Does the magnet really have to move for induction?
In every conventional generator, either the magnet or the coil moves. The shielding generator holds both still and moves the shield in between instead. A narrow slot in a rotating sleeve of high-permeability material periodically releases the field of a stationary permanent magnet. To the coil, this looks like a field rising and falling very quickly.
The idea
- 01A strong permanent magnet stands stationary at the centre.
- 02A shielding ring of high-permeability material rotates around it, carrying a narrow vertical slot — similar to a Nipkow arrangement.
- 03The shield diverts the flux and reduces what reaches the coil.
- 04When the slot passes a coil, the flux there rises rapidly and then falls again.
- 05By Faraday's law, this flux change induces a voltage in the coil.
How it works
- Stationary magnet on a non-conductive carrier, to avoid eddy currents in the structure.
- Shielding sleeve in mu-metal as a practical candidate; ferrite at higher frequencies to reduce eddy-current losses.
- An initially narrow slot of around 1 mm for a cleanly measurable pulse.
- Drive by a speed-controlled motor with measurable torque.
- Coils arranged around the circumference, each optionally with rectifier and buffer capacitor.
- A minimal air gap between magnet, shield and coils.
What is different about it
- The shield moves, not the magnet and not the coil.
- The flux change is switched rather than mechanically tracked — pulse shape and frequency become designable.
- Less moving mass than a rotating magnet rotor.
- A compact build with many coils around a single field source.
What we already have
- The operating principle and the prototype geometry are worked out.
- Material and build candidates for a first laboratory setup are defined.
What we still want to prove
- Field modulation and a closed energy balance before any scaling.
- Whether the geometry offers engineering advantages: field modulation, compactness, controllable pulses, reduced moving mass.
- Superconducting shielding remains a separate research branch, not a prerequisite. Boron-doped diamond is not a room-temperature superconductor, and YBCO requires cryogenic cooling.
Where it could matter
- Basic experiments on field modulation
- Compact pulse sources with designable waveform
- Research cooperation on magnetic materials and loss behaviour
Physics & verification
The concept does not bypass conservation of energy. Any useful electrical output creates an electromagnetic reaction on the shield under Lenz's law, plus hysteresis, eddy-current and mechanical losses. The research question is whether the geometry offers engineering advantages — not whether more comes out than goes in. The first bench test must measure simultaneously: motor input power and torque, loaded and unloaded; output voltage, current and power; the magnetic flux waveform; shield heating including hysteresis and eddy-current losses; and rpm and air gap. Efficiency claims only after a closed energy balance.
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