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TRIPLE-DRIVE PMM/PMG COMBO

Grid-Tie & Backup Storage System

Hackaday Green Powered Challenge — 2026

CYR Technologies · Chicago, IL · Wolf13

Public Domain Prior Art Declaration · April 2026

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WHAT THIS IS

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A home power generation, storage, and community grid-feed system

built around a triple-motor permanent magnet outrunner and a

cog-relief permanent magnet generator. No combustion. No fuel.

No external excitation required. All mechanical details declared

public domain.

THE DRIVE STAGE — TRIPLE-MOTOR OUTRUNNER

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One outrunner shell. Three motors inside it — M1, M2, M3 —

separated by 120 degrees each. The axle runs all the way through

the assembly, anchored at both ends to fixed frame posts.

Three motors at 3 cog positions each = 9-position total cog cycle.

At no point in the rotation are all three motors at dead center

simultaneously. The shell always has at least one motor in push

or pull drive. Dead center is never shared.

The three staggered drive pulses per cog cycle deliver a far

smoother torque stream to the flywheel than any single-motor

design. The flywheel integrates what remains and delivers clean

continuous rotation to the PMG output stage.

THE 4-POST ASSEMBLY

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Left to right:

  POST 1 ── Fixed to frame. Axle anchored here. Does not rotate.

  OUTRUNNER ── Single shell, three internal motors, 120° offset.

  POST 2 ── Bearing support. Axle supported after outrunner.

  FLYWHEEL ── On spinning axle. Bearing-supported both sides.

  POST 3 ── Bearing support. Flywheel supported far side.

  PMG ── Cog-relief permanent magnet generator. DC output.

  POST 4 ── Fixed to frame. Far end anchor.

Two fixed posts (1 and 4). Two bearing posts (2 and 3) flanking

the flywheel. Axle spins continuously through all stages.

THE OUTPUT STAGE — COG-RELIEF PMG

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AC induction generators are the wrong tool for battery charging.

They require external magnetization, suffer high rotor losses

from copper windings, and drop efficiency sharply at partial load

— exactly when a battery bank charges most of the time.

Peak efficiency of AC induction: 80–93%.

The cog-relief PMG is self-excited, near-zero rotor losses, and

holds 90–97.5% efficiency across the entire load curve including

partial load. For a battery charging application it is the only

correct choice.

THE STORAGE STAGE

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PMG output → MPPT charge controller → 48V battery bank →

inverter → home.

MPPT (Maximum Power Point Tracking) is the proven standard from

solar installations. It continuously optimizes charge rate

regardless of PMG output variation.

48V is the established residential storage standard — widest

compatibility with off-the-shelf BMS units, inverters, and

monitoring equipment. Lower current than 12/24V systems means

less heat, thinner wire, better overall efficiency.

THREE FUNCTIONS OF THE BATTERY BANK

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PRIORITY 1 — HOME FIRST

  Refrigerator, lights, tools, essential appliances.

  The home is always covered first. No grid dependency

  for daily needs.

PRIORITY 2 — GRID OVERFLOW

  Genuine surplus feeds into neighborhood grid at night —

  when solar produces nothing and conventional generation

  carries all load. Fills the temporal blind spot solar

  leaves behind. No cost to the homeowner.

PRIORITY 3 — MECHANICAL BACKUP

  If the outrunner assembly requires maintenance or repair,

  stored energy bridges the gap. Any service window becomes

  a planned event, not an emergency. The home never loses

  power during repair.

THE NIGHT GAP — COMMUNITY...