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OS:CD Motor

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CD Motor
Image:CD Motor Harwood 95x95.jpg

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CD Motor Open Source Project

This page concerns an experiment that was developed between Sept 2001-2004 under the direction of Tim Harwood in an Egroup. Inspired by the claims of Robert Adams and his exotic pulsed motor technology, it was widely replicated.

Adams never wished others to speak on his behalf, so it should be made clear that the CD motor was developed wholly independently, without input from Mr Adams himself.

The motor instructions posted herein are compiled by Tim Harwood from that project. He says that when followed they will result in a motor that has been demonstrated to manifest unexplained thermal properties (i.e. drops in temperature below ambient) and back-emf surges in excess of 80% of input. However, none have yet been able to advance to the point of having a self-running system with power left over to use. It it hoped with improved circuitry, core materials, and a 240v apparatus input, the 100%-plus level can be achieved.

The adequacy of these plans now posted at PESWiki to provide sufficient information to build a replica as described has not yet been verified by a successful replication. A version of the plans presented elsewhere, did result in successful replications.





What is unique about the CD Motor is that it was based upon a highly specific theory of operation, based upon the in-register geometry Directory:CD Motor. While previous claims about exotic performance had either been vague, or talked about the battery, the CD motor has always been highly specific. Based upon this tight theory, the goal was to design actual apparatus than conformed to it, while being as cheap and low cost as possible.



The CD motor is based upon a rule-of-5.

  • The stator head should be about 20% of the cross sectional area of the rotor pm face
  • The pulse duty should about 20% through the physical spacing of the pms on the rotor

The above layout is the one I endorse because it makes for a stable pulse platform:

  • All S poles out with 3/4" diameter grade 8 ceramic pms
  • 2x opposite 3.5 ohm stators for a 7 ohm series set wound on iron based stator cores


OS:CD Motor Construction

Assembly can be done cheaply and simply largely with household items.



Answers to the most frequently asked questions


OS:CD Motor old egroup replications

List a link to your replication from this PESWiki project.

Sandwiched rotor

The sandwiched rotor layout where current is induced at both ends of the coils, might be the final answer as to how to achieve a 12v self runner. That simple but crucial layout change will unquestionably significantly boost the current component of the energy gain (up to doubled), since a full strength magnetic field cuts the copper wire at both ends of the stator, instead of just one. My original research concept.

Torque will also be doubled, since the stator attraction phase now has 2 opposite yawing magnets pulling through the core, instead of just a passive attraction to iron.

Torque optimized

After much consideration, I developed this 6 pole design layout, as a further improvement to the sandwiched rotor concept (not tested):

It integrates an air based flux path, and cleans up the magnetic signature of the device. At high rpms this is hypothesized to have the possibility to make a substantial difference to performance.

Adjacent magnet spacing, and opposite magnet spacing, would need experimental feedback for full optimization, since - the poles are intended to divert to adjacent poles when stators are pulsed.

Obviously, ganged up on a shaft, this layout would multiply torque. 4 pairs of rotors, each slightly out of phase with each other, would deliver more or less continuous torque to the main shaft.

I want to thank Joe Flynn for kindly offering the analysis that the Adams motor lacked a flux path - that comment directly inspired the development of this 6 pole layout.


ANY experimentation undertaken is performed ENTIRELY AT YOUR OWN RISK.


The CD Motor was developed wholly independently of Mr. Robert Adams.

Youtube video



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See also

- Other Open Source Projects
- Open Source News
- PESWiki main index
- PES Network Inc.

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