Babcock-Paul · Source catalogue

A patent for an electric motor (rotary, curvilinear or linear) in which a stator of many segmented solenoid/toroidal coils laid along the path of motion interacts with an armature carrying permanent magnets. Stated novelty: thrust comes from interaction of armature and stator fields in arc-shaped regions OUTSIDE and between the leading/trailing edges of the armature and the nearby stator coils (the 'field interaction plane'), not only across a small air gap, with 'substantially reduced flux coupling' from armature to stator coil (p.1, p.10-11). A coil that is overlapped by the armature, or that couples more than a predetermined amount of armature flux, is held at substantially zero current to reduce counter-electromotive force (CEMF, the voltage a moving magnet induces in a coil, opposing the drive current) (pp.11-12). The patent is not ironless: the stator core 310 is 'a continuous ring of ferrous material' (FIG. 3, FIG. 7; a gapped-core variant is FIG. 4) and the armature has a high-permeability steel/ferrous horseshoe ring 510 (FIGS. 5-6); only the housing and shielding are low-permeability/non-metallic (relative permeability 'up to about 1.02 ... 2.0'; claim 4 'less than 1.20') (pp.12-13). Drive electronics: each stator segment has an electronic switching circuitry module (ESCM) with polarity, pulse-width, timing and on/off set by binary logic from a Motor Controller/Binary Logic Generator; speed is set by the logic clock step rate and torque by the master pulse width, i.e. open-loop synchronous/stepper-like control with angular position feedback (hall sensors, search coils, encoder/resolver) (pp.13-15). FIG. 12 (deep read) is two switch modules 1210a/1210b (the OCR 'four modules 1210a-d' is wrong) forming an H-bridge, with a single blocking diode 1205 at the input, capacitor 1215, a dissipative switched RC clamp (path C) and a recovery switch (path D). Sequence: capacitor 1215 (charged above the supply by recovered flyback energy) drives the coil first (A), then the source (B), then the clamp (C), then leakage energy is recaptured into the capacitor (D). The FIG. 10 variant uses a gas tube as a transitional voltage clamp and sends captured energy out on a separate output. This is a standard regenerative-snubber / asymmetric-bridge type of energy-recovery drive; it recycles energy the coil already stored and cannot add energy. The patent also says the machine can run as a generator, with current in a flux-coupled coil giving regenerative braking into a battery (p.16). Stated advantages include high thrust/torque at high speed, lower weight and cost, non-metallic housing, low switching frequency, 'enhanced efficiency', negligible EMI and modular construction. There are 20 claims and 7 drawing sheets: independent claims are claim 1 (device), claim 5 (method of accelerating a load) and claim 14 (device); all three recite the overlapped module/coil being held in a substantially zero-current state; claim 12 makes the flux threshold 'a predetermined function of armature speed'. The patent gives no measurements, efficiency figures, voltages, dimensions or test data. The text claims no output exceeding input; the sentence closest to an energy claim is 'a motor armature that produces little or no counter-motive force can be driven to a given amount torque and speed with much less electrical power' (p.15), which is qualitative and in tension with the patent's own generator-mode statement (p.16).

Key claims

• Thrust can be generated by interaction of armature and stator magnetic flux in arc-shaped regions external to the armature and between its leading and trailing edges and the neighbouring stator coils (claims 1, 5, 14).
• Holding a stator coil at substantially zero current while the armature overlaps it, or while it couples more than a threshold of armature flux, substantially reduces counter-electromotive force (claims 1, 5, 10, 14; claim 12 makes the threshold a function of armature speed).
• Flyback energy captured by the switching modules can be stored in a capacitor above the supply voltage and reused on the next pulse as a secondary power source, giving enhanced efficiency and reduced input impedance (p.14, FIG. 12).
• A motor armature that produces little or no counter-motive force can reach a given torque and speed with much less electrical power (p.15).
• The arrangement allows high thrust-to-weight ratio with a non-metallic housing (relative permeability below 1.20 in claim 4) and little metallic shielding, because stray flux is low.
• The same machine can operate as a generator with regenerative braking by allowing current in a coil segment while armature flux couples to it (p.16).

Relevance: The only document in the folder, so it is the whole project. It is a conventional-physics permanent-magnet motor with segmented coils and energy-recovery switching. It is in the 'efficiency improvement' category, not a stated over-unity claim. Why it sits in an alternative-energy collection is not stated in the document, but the References Cited include two Bedini patents (US 6,392,370 B1, 5/2002, and US 2002/0097013 A1, 7/2002, both p.2), the 'Bedini' pulse-motor/battery-charging tradition, which is the likely connection. The list also has two Babcock family documents (US 2007/0146958 A1, Babcock et al., and US 2009/0073726 A1, Babcock; p.2), and the patent incorporates US 7,602,157 and US 2009/0073726 (Current Waveform Construction, Babcock et al.) by reference. The other cited art is mainstream power electronics: snubber and energy-recovery papers by He, Mao, Liu, Ivensky, Williams, Okuma, Agelidis, Elasser, Bendien, Bell (pp.1-2).

Mainstream conflict: None for the operating principle. Switching a coil off during overlap, and recovering inductive flyback energy into a capacitor, are standard motor-drive and power-electronics ideas (deep read, FIGS. 10-12). Points where the wording goes further than the physics supports: the qualitative 'much less electrical power' sentence (p.15) and 'reduction in input impedance' (p.14; the coil impedance is unchanged, the coil is driven from a higher capacitor voltage at the start of the pulse); 'low stray flux' (the thrust itself depends on external fringe flux); and a tension on switching frequency, 'low (e.g., synchronous) frequency' (p.11) against 'high frequency' pulsed DC drive (pp.14-15). Back-emf does not vanish: the energised neighbour coils still link armature flux and carry back-emf, and the patent's own generator mode (p.16) shows current in a flux-coupled coil is the energy-conversion channel. The patent states no output above input.