TRIPLE-DRIVE PMM/PMG COMBO | Details

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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

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 RESILIENCE

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Solar net metering has proven that distributed generation can

feed back into neighborhood grids. This system applies the same

principle to the temporal blind spot: the hours after sunset

when solar is zero and neighbors without any renewable setup

receive no benefit.

The flywheel-smoothed, battery-buffered output is well-conditioned

for grid-tie inverter use. Home is protected first. Only genuine

overflow feeds the grid. The community benefit is real and costs

the homeowner nothing.

Where solar is already installed, this system fills the night gap

rather than duplicating daytime generation. The two technologies

are complementary — solar owns the day, this system owns the

night. Together they approach continuous renewable coverage.

WHY IT WORKS

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1. Three motors at 120° separation inside one shell.

9-count cog cycle. Dead center never shared across all three.

Continuous drive output.

2. Cog-relief PMG: self-excited, 90–97.5% efficiency,

exceptional at partial load. Right tool for battery charging.

3. Flywheel: bearing-supported both sides, no cantilevered load.

Receives smooth three-pulse torque stream, delivers clean

rotation to PMG.

4. 48V storage: maximum component compatibility, lower losses

than 12/24V, proven residential standard.

5. Battery as resilience, not just capacity. Mechanical backup

built in. Service windows become planned events.

6. Night grid overflow complements existing solar infrastructure.

No duplication — fills the temporal gap.

7. No combustion. No fuel. No emissions. No noise.

Runs on established, available, off-the-shelf components.

PUBLIC DOMAIN DECLARATION

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All mechanical details in this submission are declared public

domain prior art. No patents filed. No patents intended for

the mechanical architecture described here.

This record is established April 2026.

CYR Technologies · Chicago, IL

Alan Cyr · Founder & CTO

Wolf13 · 🐺⚡

Hackaday Green Powered Challenge · 2026

Public domain submission — mechanics only

═══════════════════════════════════════════════════════════════════// CYR Technologies — Hackaday Green Powered Challenge

Triple-Motor PMM Outrunner

Grid-Tie & Backup Storage System

Three motors inside one outrunner shell — 9-position cog cycle, continuous drive, flywheel-integrated, battery-buffered, home-first with community grid overflow at night.

Green Powered

Grid-Tie

48V Storage

Community Resilience

No Combustion

The Problem This Solves

Solar is transforming home energy — but it has a hard edge: it stops at sunset. The hours when neighbors without solar need power most — evenings, night — are exactly when solar produces nothing. Single-generator setups have a second problem: mechanical failure means a dark house. This system addresses both.

🌙

The Night Gap

Solar feeds the grid all day. At night the grid reverts to conventional generation. Neighbors without storage get no renewable benefit after dark.

⚡

Single Point Failure

One generator — one failure point. Any mechanical issue cuts power immediately with no bridge to keep critical loads running during repair.

🔧

No Output Buffer

A PMM without flywheel integration passes torque variation directly to the generator. A flywheel on the same axle smooths rotation and protects downstream electronics.

The Mechanical Stage — Triple-Motor Outrunner Assembly

One outrunner shell. Three motors inside it, separated by 120° each. The axle runs all the way through the assembly — anchored at both ends to fixed frame posts, spinning through all stages. The three motors share the single rotating outer shell and are angularly positioned so their cog cycles are offset by one third of a full rotation. With three motors at 3 positions each, the total cog count is 9. 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.

After the outrunner, the spinning axle passes through two bearing-supported posts flanking the flywheel, drives the generator, then terminates at a fixed frame post. The flywheel receives an already much smoother torque input than a single-motor design — three staggered drive pulses per cog cycle instead of one.

POST 1

Fixed/Frame

Axle anchor

120° · 120° · 120°

↻

Triple-Motor Shell

9-count · outer shell rotates

POST 2

Bearing

FLY

WHEEL

Inertia

smooth output

POST 3

Bearing

GEN

Generator

AC output

POST 4

Fixed/Frame

Far anchor

━━━━━━━━━━ AXLE RUNS FULL LENGTH — SPINS THROUGH ALL STAGES ━━━━━━━━━━

Posts 1 & 4: Fixed to frame. Anchor the axle at both ends. Do not rotate.

Posts 2 & 3: Bearing-supported. Flywheel held between them — supported both sides, no cantilevered load.

Three motors · one shell: M1, M2, M3 separated by 120° inside the single rotating outer shell. 3 motors × 3 positions = 9-count cog cycle. Dead center is never shared across all three.

Flywheel: Receives three staggered drive pulses per cog cycle. Delivers smooth continuous rotation to the generator.

System Block Diagram — Energy Path

M1 · M2 · M3

3 motors · 1 shell · 9-count

→

Flywheel

Ripple integrator

→

Generator

AC output

→

MPPT

Charge control

→

48V Bank

Battery storage

→

Inverter

DC → AC

OUTPUT PRIORITY:

① Home First

Appliances · Refrigerator · Lights · Tools

② Grid Overflow

Night gap fill · Community feed

③ Backup Reserve

PMM maintenance · Mechanical failure bridge

The Storage Stage

Generator output feeds an MPPT charge controller — the same technology proven in solar installations — which maximizes charge efficiency into a 48V battery bank. The 48V standard gives the widest compatibility with off-the-shelf inverters, BMS units, and monitoring equipment. The inverter converts stored DC to AC for the home. The battery serves three distinct functions simultaneously.

PRIORITY 1

Home Power

Refrigerator, lights, tools, and essential appliances. The home is always covered first from stored energy — no grid dependency for daily needs.

PRIORITY 2

Grid Overflow

Genuine surplus feeds into neighborhood distribution at night — when solar produces nothing and demand peaks. Fills the temporal gap solar leaves behind.

PRIORITY 3

Mechanical Backup

If the outrunner assembly requires maintenance or repair, stored energy bridges the gap. No outage during service. The system is self-protecting.

The Night Gap — Community Grid Reinforcement

Solar net metering has proven that distributed generation can feed back into neighborhood grids. This system applies the same principle to the temporal blind spot: night hours when solar is zero and conventional generation carries all load. Neighbors without any renewable setup receive a real benefit — not just during daylight hours when solar already overproduces, but during the hours it matters most.

The flywheel-smoothed, battery-buffered output is well-conditioned for grid-tie inverter use. No raw generator ripple reaching the grid. Home is protected first. Only genuine overflow feeds out. The community benefit costs the homeowner nothing — it comes from energy that would otherwise be unused.

Why It Works

Three Motors · Continuous Drive

Three motors inside one shell, offset 120° each. With 3 motors at 3 cog positions each, the cycle count is 9. At no rotation point are all three at dead center — the shell always has drive. The flywheel downstream smooths an already clean torque stream, not raw pulses.

MPPT — Proven Charge Technology

Maximum Power Point Tracking is the standard in solar installations for a reason. It continuously optimizes the charge rate regardless of generator output variation — the same benefit applies here.

48V — Maximum Compatibility

48V is the established standard for residential battery storage. Widest selection of BMS, inverters, and monitoring equipment. Lower current than 12/24V for the same power — less heat, thinner wire, better efficiency.

Storage as Resilience, Not Just Capacity

The battery bank is not just an energy reservoir — it is a mechanical failure buffer. Any PMM maintenance window becomes a planned event rather than an emergency. The home never loses power during service.

No Combustion. No Fuel. No Emissions.

The drive source is permanent magnet — no combustion, no fuel supply, no emissions, no noise. The storage and inverter stages are standard grid-tie equipment. The entire system runs on established, available components.

Complements Existing Solar

Where solar is already installed, this fills the night gap rather than duplicating daytime generation. The two systems are complementary — solar owns the day, this owns the night. Together they approach continuous renewable coverage.

CYR Technologies — Chicago, IL

Alan Cyr · Founder & CTO

Hackaday Green Powered Challenge — 2026

Triple-Motor PMM Grid-Tie & Backup Storage

Public domain submission — mechanics only

Project Details