US2021177 Motor Generator & Other Transformer

US Patent 2,021,177, titled "Motor Generator & Other Transformer," was granted on November 19, 1935, to Antonio d'Angelo, S.J. The specification describes electrical machines with a stationary or rotary pole-armature and "a new method of winding the primary and secondary circuits carried by said armature."

Stated objects

• "inexpensive, durable and reliable machines for transforming direct or alternating current into a single-phase or multi-phase alternating current or direct current of any desired voltage";
• adaptation of a pole-armature machine carrying a primary and a secondary circuit "for transforming direct current into a direct current of any desired voltage";
• "a new method for winding the secondary circuit on the pole-armature of a machine, said method resulting in an increase in electromotive forces developed in the secondary circuit."

Claimed mechanism

The core claim is a secondary winding "having a pitch which is different from that of the primary winding; preferably at least some of the turns of the secondary winding are wound in such a way that each of the last-mentioned turns encircles two, three or more poles of the pole armature." See Differential-Pitch Pole-Armature Winding.

The patent states that the induced EMF in the secondary is greater than that of the primary "although the secondary circuit has a smaller number of conductors and turns," attributing this to additive EMFs (rotor field plus stator pole reversal), four flux variations per half-cycle in each secondary coil, and the higher rotor speed (or stronger field on AC) forced by the short primary pitch.

Figure list

The specification enumerates fifteen figures, from Figure I (motor-generator in section) through Figure XV (stationary transformer with differing primary and secondary pitch). Figures Va–Vc present the flux and EMF diagrams, including the area-based average-voltage argument of Figure Vc. The full figure list is reproduced in the source article.

Machine variants described

• DC → two-phase AC (Figs. I–V)
• DC → DC low voltage (Fig. VI) and high voltage (Fig. VII)
• Series/compound field arrangement (Fig. VIII)
• Two-phase AC → DC (Fig. IX), with a stated example of 12,000 V AC to 25 V DC
• Rotating-armature three-phase generation (Figs. X–XI)
• Rotating-armature DC → DC variants (Figs. XII–XIV)
• Stationary two-phase transformer (Fig. XV)

Evidence status

The patent is a legal document describing an apparatus and asserting operating principles. It reports no efficiency figures, no test results, and no third-party verification. The Figure Vc argument is illustrative geometry, not measurement. The patent does not claim over-unity and does not mention "inter-atomic" energy or ions — a notable contrast with the 1928 press claim (Inter-Atomic Ion Energy Claim).

Related

• Antonio d'Angelo
• Differential-Pitch Pole-Armature Winding
• d'Angelo Claims vs. Evidence: The 1928 Press Report, the 1935 Patent and the Absence of Measurement