Power-generating electric motor
Yoshiaki Takahashi
Public domain · full text
Em uma página
Yoshiaki Takahashi's 1999 United States patent is a brushless electric motor with two additions. First, each pole of the permanent-magnet rotor carries a flat, very strong magnet in a slot at its base, specified with a maximum energy product of at least 50 MGOe, preferably at least 100 MGOe, and built as two layers of different magnet alloys. Second, beside every field coil on the stator sits a separate induction coil that takes out electric power as each rotor pole sweeps past. The motor turns by switching: a Hall-effect sensor sees a rotor pole arrive, energises the next field coil so its core attracts the pole forward, and the current in the coil that has just done its work fades as the pole moves away. A capacitor across the induction coil can tune it to the frequency produced at low speed. The stated aim is a motor that keeps itself running from a starting input while storing power.
Por que importa aquiChapter 2's energy-accounting section teaches how a device on a bench becomes evidence. A switched-coil motor with a generating winding is the cleanest possible example: its architecture is fully published, it is buildable with ordinary parts, and the only thing that decides what it does is a careful measurement of real electrical power in and out over a long, closed run with every store of energy accounted for.
O que afirma
01The claimed machine. A power-generating electric motor comprising a rotor with at least two magnet poles, an armature coaxial with it across an air gap carrying field cores each with a field coil, a brushless control circuit, a high-energy-product permanent magnet inside each rotor magnet pole with a duplex structure of an inner Co–Fe–Y layer and an outer Fe–Nd–B layer, and an induction coil adjacent to each field coil for the generation of electric power.Claim 1; also claims 9 and 12
Designed, not yet built02The magnet specification. The high-energy-product magnet has a maximum energy product of at least 50 MGOe, preferably at least 100 MGOe, and a permeance coefficient of 1.0 to 4.0, preferably 2.5 to 3.5; the embodiment used a magnet of 144.7 MGOe with a permeance coefficient of 3. A further such magnet may sit inside each stator field core.Claims 5 to 8 and 10; Detailed description; Preferred embodiment
Designed, not yet built03How it turns. Hall elements, one per field coil, detect a passing rotor pole; each output drives a transistor that excites the next field coil so its core becomes a south pole attracting the rotor's north pole forward, while the excitation of the preceding coil dies away as the pole moves off. Repeating the sequence rotates the rotor without brushes, and each passing pole induces a current in the adjacent induction coil that is taken out as electric power.Detailed description, the operating sequence; Preferred embodiment, Figures 6 and 7
Designed, not yet built04Tuning the generating coil. A capacitor, variable in the embodiment, connected in parallel with the induction coil tunes that circuit to the induction frequency at a low rotor speed, 500 to 800 revolutions per minute in the description and about 800 in Figure 9, so that power can be taken out effectively at low speed.Claim 11; Detailed description; Figures 8 and 9
Designed, not yet built05The measurement that decides it. The patent states its objective as long self-running from a starting input with storage of electric power. What settles any such objective is the same for every machine: real input power and real output power measured with instruments that capture phase and waveform, over a run long enough that the state of charge of every battery, capacitor and magnet at the start and end is known, ideally with the loop closed so the machine runs on its own output.Summary of the invention, the stated object; the measurement standard is the site's
What to watch
Leia
The machine, in the site's own words
1. A switched motor is a sequence of attractions
Every brushless motor turns by timing. A rotor pole approaches a stator coil; the coil is switched on so its iron core pulls the pole toward it; just as the pole arrives the coil is switched off, so it does not hold the pole back as it leaves; the next coil round is switched on to pull it onward. In this patent a Hall-effect sensor at each coil reports where the pole is and a transistor does the switching. The skill is entirely in when a coil turns on and off.
2. Two additions
Takahashi adds a very strong flat magnet, built as two layers of different alloys, inside the base of each rotor pole, and optionally inside each stator core. And he winds a second coil beside every field coil. The field coils drive the rotor; the second coils generate, because every pole that sweeps past them changes the magnetic flux through them. A capacitor across a generating coil tunes it, so it delivers power well at low speed.
3. What the patent aims at, and what would settle it
The stated object is a motor that runs for a long time from a starting input while storing electric power. The design is completely described, which means it can be built, and the decisive test is a measurement, not an argument: true input power and true output power, recorded with instruments that capture the phase between voltage and current and the shape of the waveform, over a run long enough that the energy in every battery, capacitor and magnet is known at start and end. The instrument in chapter 2 walks through why each of those conditions matters.
Citation
Yoshiaki Takahashi, Power-generating electric motor, United States Patent 5,861,693, application 08/559,938 filed 17 November 1995, granted 19 January 1999. Full text: patents.google.com/patent/US5861693A.
A porta de entrada
https://patents.google.com/patent/US5861693A/enWHICH COPY WAS READ. United States Patent 5,861,693, Power-generating electric motor, inventor Yoshiaki Takahashi, application 08/559,938 filed 17 November 1995, granted 19 January 1999, read in full on 2026-09-13 from the Google Patents full-text record for US5861693A — the abstract, all fourteen claims and the complete description, including the preferred embodiment and the brief description of figures 1 to 9. RIGHTS. The text of a United States patent is a public record and is reproduced freely; this page nonetheless quotes little and describes the rest in its own words. The nine drawings are described, not reproduced. WHAT THE PATENT IS AND IS NOT. The patent claims a brushless motor with Hall-element switched field coils, a high-energy-product duplex permanent magnet inside each rotor pole, and an induction coil beside each field coil for taking out electric power. It does not describe a linear or circular diverging-magnet rail with a pole piece bridging a gap; that architecture is sometimes associated with the inventor's name in commentary, and it is not what this document claims.
Como citar
Yoshiaki Takahashi (1999) Power-generating electric motor. US5861693A
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