FIGUERA'S AETHER MAGNETIC FIELDS LINEAR PUMP, REVIVED

kampen · May 03, 2026, 11:01 AM

Complete Parts List — 4-Coil Small-Scale SSD Test Unit

1. Coil / Magnetic Section

Part	Spec	Qty
Coils	90 turns, AWG18, identical	4
Magnetic cores / bobbins	25 mm spacing type, non-shorted laminations preferred	4
Tap terminals	N0, N1, N2, N3, N4	5
Magnet wire	AWG18 enamel copper	as needed
Silicone hookup wire	16–18 AWG	2–3 m
Base plate	Acrylic, FR4, HDPE, or plastic	1

2. Selector Switch Hardware
You need 4 selectors:

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SL0, SL1, SR2, SR3
Each selector uses 2 back-to-back N-MOSFETs.

Part	Spec	Qty
N-channel MOSFETs	Logic-level, low Rds(on), 60–100 V minimum	8
UCC21220 isolated dual gate driver	2 channels per IC	2
Isolated 12 V DC-DC supply	One per selector, 1 W is enough	4
Gate resistors	10 Ω, 0.25 W	8
Gate pulldown resistors	10 kΩ, 0.25 W	8
Gate-source zener diodes	12–15 V	8
Decoupling capacitors	100 nF ceramic	8
Bulk capacitors	1–10 µF ceramic/electrolytic	4
Screw terminals	2-pin, 5.08 mm	8–12

Recommended MOSFET examples:

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IRLZ44N

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IRLZ34N

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IPP110N20N3

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IRFB3207
For low-voltage testing, IRLZ44N is acceptable and easy to use.

3. Controller

Part	Spec	Qty
Arduino Uno Rev3	Original or compatible	1
USB cable	USB-A to USB-B	1
Jumper wires	Male/female Dupont	set

Arduino pin usage:

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D3 → SL0

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D5 → SL1

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D6 → SR2

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D9 → SR3

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GND → gate-driver logic-side GND only

4. Power Supplies

Part	Spec	Qty
Main bench PSU	0–30 V, current limit, 0–5 A	1
Logic supply	Arduino via USB or 5 V supply	1
Isolated gate supplies	12 V isolated DC-DC, one per selector	4

Important:

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Main PSU must be current-limited.

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Do not use uncontrolled battery power for first tests.

5. Protection / Safety Parts

Part	Spec	Qty
Fuse holder	Inline or panel mount	1
Fuse	2–5 A	several
TVS diode across DC input	33–48 V depending on PSU voltage	1
Emergency stop switch	Optional but recommended	1
Small heatsinks	For MOSFETs	4–8
Thermal pads / mica washers	If mounting MOSFETs to metal	as needed

6. Measurement Equipment

Part	Spec	Qty
Multimeter	Basic DMM	1
Oscilloscope	2-channel minimum	1
Current probe / clamp	DC capable preferred	1
Hall sensor module	SS49E / A1324 / linear Hall sensor	1–4
Incandescent test bulb	Low-voltage lamp	1

Minimum Build Quantity Summary

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4 coils

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5 coil tap nodes

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4 selector switches

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8 MOSFETs

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2 UCC21220 drivers

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4 isolated 12 V gate supplies

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1 Arduino Uno

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1 current-limited bench PSUCritical Rule
Do not replace the selector with a normal MOSFET relay module.
Each selector must be:

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back-to-back MOSFETs + floating isolated gate drive

kampen · May 03, 2026, 01:16 PM

Subject Ref.: 4-Coil SSD (Figuera-Type) Test Setup – Topology & Switching Sequence Validation

Here I am showing and validating a small-scale 4-coil SSD (Solid-State Commutator)
system based on a sliding excitation window concept.

I have attached, see below two diagrams showing:

System topology (coil chain + selector structure)
Switching sequence and timing (make-before-break overlap)

System Overview

4 coils in series → nodes N0–N4
Left selectors (SL0, SL1) connect to +V
Right selectors (SR2, SR3) connect to GND
Active window = 2 coils energized at a time

Example:

S1: SL1 + SR3 → coils Q2–Q3 active
S2: SL0 + SR2 → coils Q1–Q2 active

Key Principle
This system uses a sliding current window, where:

During transitions:
- 1 coil turns OFF (left side)
- 1 coil turns ON (right side)
- Remaining coils stay energized
Switching is done with:
- Make-before-break overlap
- No open-circuit allowed

Switching Sequence
The second image shows:

Stable states (S1, S2)
Transition state with overlap:
- SL0 + SL1 active
- SR2 + SR3 active

This ensures:

Continuous current flow
Reduced inductive spikes
Smooth magnetic field translation

Purpose of This Build
Here I am validating:

Continuous current during switching
Correct current path (no unintended conduction)
Magnetic field displacement along the coil chain
Stability of the commutation logic

Regards, Alex

kampen · May 03, 2026, 01:21 PM

Switching sequence and timing (make-before-break overlap)

kampen · May 04, 2026, 10:37 AM

Subject Ref.: UCC21220 Isolated Dual-Channel Gate Driver – Selector Driver for SSD Commutator

As part of my 4-coil SSD (solid-state commutator) test setup,
I am implementing the selector switching using an isolated gate driver solution.

I have attached three images of the module I am using:

Physical module with dimensions (≈43 mm × 22 mm)
PCB layout/isolation barrier view
Pinout and connection labeling

Driver Details
The board is based on the UCC21220 (UCC21xxx family) and provides:

✔ 2 isolated gate driver channels per IC
✔ True galvanic isolation (input ↔ output)
✔ Suitable for floating MOSFET switching
✔ High peak drive current (fast switching capability)

How I am Using It
Each IC drives 2 selectors, where each selector consists of:

2× back-to-back N-MOSFETs (bidirectional switch)
1× isolated driver channel

So for the 4-coil test:

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SL0 → Channel A (IC1)

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SL1 → Channel B (IC1)

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SR2 → Channel A (IC2)

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SR3 → Channel B (IC2)

Connections (Overview)
Input side (logic / Arduino):

VIN → 5V logic supply
GND → Arduino GND
INA / INB → PWM control signals
DIS → optional enable/disable

Output side (floating per channel):

VDDA / VDDB → isolated 10–12V supply
GNDA / GNDB → MOSFET source reference (floating)
OUTA / OUTB → MOSFET gates

Important Design Notes

Each channel operates fully floating
Output ground must connect to the MOSFET source node, not the system ground
Requires an isolated DC-DC supply per selector
Enables proper bidirectional current control (no body diode issues)

Purpose in This System
This driver is critical because:

The SSD commutator requires node-to-node switching
Selectors must not be referenced to common ground
Clean switching is required for:
- Continuous current flow
- Controlled overlap (make-before-break)
- Avoiding inductive spikes

Looking for Feedback
I would appreciate your input.

Regards, Alex

kampen · May 04, 2026, 01:15 PM

Subject Ref.: 4-Coil SSD (Figuera-Type) Test Setup – Measurement-Ready Layout with Instrumentation

I have updated my 4-coil SSD (Solid-State Commutator) test setup
to a measurement-ready configuration and wanted to share the latest render.

This version includes:

✔ Horizontal coil alignment on a PA6 (nylon) core rail
✔ Proper node chain (N0–N4)
✔ UCC21220 isolated dual-channel gate drivers
✔ Full instrumentation points for voltage, current, field, and temperature.

System Overview

4 coils in series:

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N0 — Q1 — N1 — Q2 — N2 — Q3 — N3 — Q4 — N4

Left selectors (SL0, SL1) connect to +V
Right selectors (SR2, SR3) connect to GND
Active window = 2 coils

Example state:

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SL1 + SR3 ON

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→ Current path:

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+V → N1 → Q2 → N2 → Q3 → N3 → GND

Measurement Points Included
The render shows clearly defined measurement locations:
Voltage (scope channels)

CH1 → V_N0
CH2 → V_N1
CH3 → V_N2
CH4 → V_N3
CH5 → V_N4

Current

Clamp probe on main chain (I_CHAIN)

Magnetic field

Hall sensors H1–H4 centered on each coil (axial direction)

Temperature

T1–T4 sensors on each coil

Gate signals

Monitoring PWM inputs (INA / INB of UCC21220)

Driver Configuration
Using UCC21220 isolated dual-channel gate drivers:

2 boards total (4 channels)
Each channel drives one selector (back-to-back MOSFET pair)
Fully floating output stage
Isolated 10–12V supply per driver side

What I am Validating
This setup is now intended to measure:

Continuous current during transitions (no interruption)
Proper make-before-break overlap behavior
Node voltage evolution along the chain
Spatial magnetic field displacement
Thermal behavior under load

Design Notes

All coils are mounted horizontally on a non-magnetic PA6 core
Equal spacing: 25 mm
All coils are wound in the same direction
No common ground between the power stage and the logic side
Short, organized wiring to reduce parasitics

I will share real measurement results once the hardware is fully assembled and tested.

Regards, Alex

FIGUERA'S AETHER MAGNETIC FIELDS LINEAR PUMP, REVIVED

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