Adams Magnetic Motor

last updated:19 Jun 2002

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Adams Pulsed Magnetic Motor

This is a side view of my large adams motor. It has a rotor with 4 bar super magnets arranged radially. There are 2 drive coils and 4 generator coils all wound with 20 gauge wire on low loss ferrite cores.

This is an end view of the motor. Visible is: one driver coil (bottom) on generator coil (top), the rotor (in the center) and the dual reed switch timing circuit on top.

This view more clearly shows the rotor. It is constructed out of three circular pieces of plywood stacked to make a thick rotor. Four slots were cut in the center rotor to hold the magnets. I used 8 super magnets (stacked) for each of the four 'bar magnets' on the rotor. Previously I did experiments with Regular hard ware store magnets. (I'll post some experimental results in the future). For the Super magnets or hard ware store magnets, I have not measured O/U. It should be noted that 1. My experiments are still in progress and 2. I am not using batteries, I am only using capacitors (since it is easier to calculate energy, efficiency, etc.) but it may be that the combination of batteries and coils are needed to produce free energy (as Bedini suggests). (These are things I'm definatly looking in to.) Anyway, If this is your first motor, I suggest not using super magnets at first. They are much harder to work with (they break all by them selfs and give you crushed fingers too) and your can get pretty good effects with regular magnets. (But I do recommend not using the 1/2 inch. Radio Shack magnets. because They suck)

This is an o-scope trace of the voltage on the motor. The short curvy section at the front of the pulse is due to the rotor magnets inducing a volage on the drive coil. Then as the voltage starts to drop (just after the magnet passes the center of the coil), the FET turns on and produces a sharp square pulse upwards (off the top of the scope), then it turns off which produces a sharp back EMF spike. This spike must be taken out of the coil (and used). If you don't drain it away (with a diode) it will 1. eventually burn out your expensive FET and 2. Actually cause the motor to run much more slowly slower.

This is the circuit diagram for my Adams motor. DC current and Voltage are measured before going in to a large electrolytic cap. (Power in) Power from back EMF is collected in a capacitor and disipated by a known resistor. Power from the four generator coils is collected by a full wave brige rectified and cap, and disipated in a known resistor. From these values I can calculate efficiency. The switch is an FET. I found that NTE2396 and NTE2377 are good FET's to use. The top ciruit is the timing circuit. It uses 2 (Radio Shack) reed switchs in series with a 9V battery to trigger the FET.

Adams motor update (21 Jun 2002)

Here is some data from a Back EMF experiment I did a while back with my adams pulsed motor. No generator coils were used. DC Power-In is measured (P=V*I) and DC Power-Out (from back EMF) is rectified and filtered (with a cap) and then disipated in a resistor (P=V^2/R) of a known impedance (Z=V/I) This experiment was done befor I replaced these magnets with super-magnets. For these experiment, I used hardware store magnets. The Magnetic fields of the four preminent (bar) magnets were measured at the poles to be about 1800 Gauss each.

This is a plot of the motors Efficiency vs. RPM's (revolutions per minute). Data is plotted in four colors representing the different resistive loads used on the Back EMF ouput: 1K, 5K, 10K, and 220K Ohms. Notice that there is an optimum operating point in speed for a given load. Above and below this speed, the efficiency decreases.

This is a plot of the net power used by the motor vs. the motors opperating speed (RPM's). Net power is calculated by subtracting the Power-Out (Back EMF) from Power-In. This is the amount of power left over which is available to run the motor. Data is also ploted for four different loads. (Note: No measurement of mechanical power out is done in these experiments)

This is a plot of Back EMF efficiency vs. power input plotted for four different loads. It is also intersting to note that each load has an optimum level of operation with respect to Net Power In. The 10K Ohm load had the highest measured efficienty (75%) at input of 1.2 (W). In Conclusion, the Adams motor operates best at a single RPM, Input Power, and Loading of the Back EMF.

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Unless otherwise noted, all materials at this site (including without limitation all text, html markup, graphics, and graphic elements) are copyrighted ), 2002 by Reginald L. Jaynes. The material available through this site may be freely used for attributed noncommercial educational purposes only. We ask that due credit and notification be given the author.  

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