The extra energy comes from the inductive kickback and magnetism,... Some of the mechanical power is consumed by BEMF just as in any motor but as the vast majority of this BEMF occurs in a coil that is separate to the power coil we can call it EMF or generated current. Of course these coils coils be made bigger to match the motive power and then there is no need for an external generator at all.
If we do not make use of the motive force of the magnetism we are wasting it, this device combines a transformer with a motor so it is already using non rotational methods. The rotation is the generating function so it is a requirement, all the functions are standard physics and accepted as normal functions it is just that combining them in one device is not done. People do not consider that you can have a transformer that is a motor and generator at the same time and people also do not consider recycling the current, this is why we fail. We have to do all these at the same time.
Now back to the lockridge device. Back in the days of WWII these devices were not available so whoever invented the lockridge device took a Bosch dynamo with a wave wound rotor and cut every other winding on the rotor. he then adjusted the brushes so that the motor pulsed using only two brushes mounted close but not exactly 180 degrees apart. The other two brushes were then mounted so that they made contact just as the power brushes disconnected from the segments. This way we recover the reactive power in the pulse. the motor field windings are mounted at 180 degrees apart in the appropriate motoring position. The generator field windings will not be set at 90 degrees to the motor field windings but at an angle that would give the highest generation effect. Unless someone knows what the difference between the best motoring position and best generating position is, we will have to find out by experiment. These generator windings will have to be of sufficient turns so as to give sufficient voltage under load to run the motor. The slots in the case are to separate the poles of the magnetic circuit so that the transformer effect is not cancelled.
The above analysis of the Lockridge device as if it was a typical inductive motor-generator: armature commutation, back-EMF, inductive kickback, mutual induction, reactive power, motoring vs. generating brush angles, etc... is nothing revolutionary. I noticed that nobody pays attention to the capacitor wound with two 35ft copper tapes and waxed butcher paper between them (as the dielectric) that is prominently featured in this device. https://youtu.be/vdkekTOv06g?t=188 If this capacitor is purposely located within the rotating magnetic flux zone generated by this device in order to induce electric charge in it, then optimally the magnetic flux should move through this capacitor in the following manner: A capacitor wound with two separate copper tapes (denoted as red and blue spirals around the center post).This is only an example of the optimal magnetic flux movement through the copper tape capacitor. This is not a suggestion to duplicate this mechanism literally. There are many other arrangements that can produce this virtual movement of flux, ...with or without moving mechanical components and/or permanent magnets. Perhaps the other parts of the Lockridge device already do that...
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