OS:CD magnetic ramp

Lasted edited by Andrew Munsey, updated on June 14, 2016 at 9:10 pm.

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Project goal

This project will seek to find a simple low cost way to replicate a patented magnetic ramp motor.

Underlying theory

The concept is that the momentum gained from the magnetic ramp will be sufficient to carry past the re-set point.

Four equally spaced magnets means there are 3 other forces acting on the rotor each time an individual magnet passes the re-set point, reducing the chance of "latching."

Where this design differs from several others, is that the ramp is made from a magnetic material, rather than an array of multiple magnets.

This ramp design is simpler in layout, less complex to build, and has a lower cost of materials than other designs.

The layout also puts minimal stress on the magnets, meaning they are less likely to demagnetize over time.

I believe this magnetic ramp layout addresses many of the shortcomings present in other designs publicised on the internet, and could run for hundreds of hours, or even until mechanical failure of the shaft, if properly constructed.

Scale of apparatus


Rotor to be a CD(s) or equivalent size

Ramp may be made from pin nails glued to CD(s)

Four magnets evenly spaced round the side

Magnet faces to be 3/4" diameter

Magnets to be grade 8 ceramic

Mounting ideas can be taken from my original OS:CD Motor

Performance expectations

1) Initial goal of only self sustaining momentum i.e. no loading

2) If self motion could be demonstrated, the next step would be to gang several said devices up on the shame shaft, to multiply the force.

3) Higher grade ramp materials / NIB magnets could also be used to upgrade the shaft torque

4) Gearing could then also be considered as a further method of using the resultant shaft force

Replication attempts

This page gives an outline of one way of attempting to replicate the patent apparatus. Other methods using custom cut parts could also be added to this replication section. Obviously, kudos to the first wholly independent successful replication, fully written up with pictures, videos, measurements, and supplier parts.

Put your link/work in here.

Theory analysis

From confidential information I understand the law of action / reaction presents an interesting analysis of these motors, that deserves more enquiry. This can be more fully addressed as and when any replications are posted.


See There was an error working with the wiki: Code[1]

Project proposer

Tim Harwood, 8/11/08.