Alternative motor windings and drive schemes

[Clugh]

F3A German Championship 2026

8/29-8/30 2026

Registration ends 7/31/2026



Anmeldung F3A_DM_2026 - Modellflugverein Werdenfels

[Clugh]

Just received from CK Aero a rotor locked Gaishen and the 50 Hk still needs a band aid for F3A ....

[Clugh]

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[Clugh]

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[Clugh]

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[Clugh]

Clugh

Way too many links to the Wiki and elsewhere.

Could you dial it back, please.

Best, LB

You can erase the entire thread and everything in it if it appeases someone important. It won't change anything about my success or knowledge.....

Thought it might be interesting for some and there's is enough evidence to support that it is but I really do not care about it to be quite frank.

I wont waste my time with karens then

Thank you,
Hubert

[Elbee]

Clugh

Way too many links to the Wiki and elsewhere.

Could you dial it back, please.

Best, LB

[Clugh]

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[Clugh]

You wont get any more work
.

[Clugh]

Cobra5 12S marine version . I have to have it. Probably 2 for twins in a Catamaran or a Hydro Outrigger. I have a Martin Truex inspired twin JAE 45 rigger. The Ghost RC is another 90,000 rpm 45mm motor with a stainless sleeve on the rotor.

Two Roostertails are always more fun than one.

On the water It is surely more than 200 mph potential in two motors like this. Maybe I can take a shot at it the world record at 6 or 8 s lipo. I have had rigger design in my head now for about 4 years that can do it. In the attachment is essentially a stainless Octura V 900 cleaver series cut with an aspect ratio of 1.9

The motors can snap even aged beryllium in some cases. So the stainless is another option.

Online store DoctorProps RC - Everything for radio-controlled models

[Clugh]

You’ve also got the Ghost American speed line Cobra5 ACE, along with the 8s and 12s marine versions. Nothing pushes an inverter’s power quite like an FE boat.

[Clugh]

Castle is a step ahead of me and sent this brand new and improved Cobra5 2026 as the upgrade to the XLX.

It is 32 bit with "enhanced datalogging with higher sampling rates with additional capacity and data points..."

It will rock well with the King Cobras 5340 ARNON 7 cores

[Clugh]

Gotha Winders,

Übrigens teile ich Thomas Schmidts Theorie des Synchronisationsverlusts, die er auf der Anzahl der Umdrehungen basiert, nicht. Der DDDD ist im Wechselstrombetrieb deutlich lauter als ein DD, was zu einem schnelleren Verschleiß der Magnete führt. Lärm als Ursache für einen vorzeitigen Synchronisationsverlust erscheint mir viel plausibler. Tatsächlich gibt es Informationen und praktische Daten, die dies bestätigen.

Die Desynchronisation von BLDC-Motoren wird am häufigsten durch Magnetdegradation (Hitze, Vibrationen, Alterung), mechanische Belastung, unzureichendes Wärmemanagement, Überlastung und Timing-Probleme des Controllers verursacht. Die stärksten Hinweise deuten darauf hin, dass die Desynchronisation mit der Entmagnetisierung zusammenhängt, die das für die Synchronisation erforderliche Drehmoment direkt reduziert.

Die Theorie, dass die Anzahl der Spulenwicklungen die Ursache sei, ist völlig unbegründet.

Der Betrieb mit vier parallelen Dreieckschaltungen führt mit Sicherheit zur lautesten Maschine, die man bauen kann. Zwölf unverdrillte, parallele Drähte sind nicht optimal.

Good luck,
Hubert

[Clugh]

BTW a Brand new Pyro 600 in the USA today cost 366 euro. PYRO 600-12 - KONTRONIK - Hochleistungsantriebe im RC-Modellbau

That is 424.00 dollars USD



A Clugh Master-rebuild service for a Brenner contra drive in F3A competition airplanes includes.

A Remington industries 240*C 18 AWG 5 + 5 parallel wye winding potted in thermally conductive epoxy. It also includes a Mitsumi custom application-specific motor shaft for the Brenner contra drive, with a 4130 hardened steel axial tie-in sleeve and three orange seal ABEC 7 ceramic hybrid ball bearings, treated and lubricated with high-speed tungsten disulfide bearing grease.

The "Better" economy makes the entire proposal for a brand new Brenner drive prepped motor greater than $700.00 dollars USD .

Enjoy your day,
Hubert

[Clugh]

This would also be an interesting cool sink proposal for passive pump ferrofluid liquid cooling.

[Clugh]

Chip-level cooling using a multi-layer capacitor is an intriguing idea, especially with some of the modern CoolFET dies available today. There’s also dual-side cooling for SiCFET and GaNFET devices, though they don’t respond nearly as well as Si FET devices to certain cooling methods. Cryogenics is one example—while GaN and SiC devices have unique properties like very high thermal conductivity, cryogenic cooling doesn’t seem to offer any real benefits for them.

[Clugh]

⚡ What Electrocaloric Cooling Is


Electrocaloric cooling uses special dielectric materials that heat up when an electric field is applied and cool down when the field is removed. This reversible temperature change is called the electrocaloric effect (ECE).

According to research, the effect comes from how electric dipoles inside the material align and disorder under electric fields

Electrocaloric (EC) cooling is a solid‑state refrigeration method based on the reversible temperature change that occurs in certain dielectric materials when an electric field is applied or removed. It’s especially relevant today because multilayer capacitors (MLCs) made from relaxor ferroelectrics like PST (PbSc₀.₅Ta₀.₅O₃) can generate large EC effects at practical voltages.
1. Basic Mechanism


EC materials contain electric dipoles that can switch between ordered and disordered states.

• Apply electric field → dipoles align → entropy decreases → material heats up
• Remove electric field → dipoles randomize → entropy increases → material cools

The cooling step is the useful part: the material ends up colder than it was before the cycle. 2. The Electrocaloric Cooling Cycle


A practical EC cooler runs a four‑step cycle:

1. Apply E‑field Material heats up due to dipole alignment.
2. Reject heat to a sink Heat is transferred out via a thermal switch or conduction path.
3. Remove E‑field Dipoles disorder and the material cools below ambient.
4. Absorb heat from the load The cold EC element pulls heat from whatever you’re trying to cool.

Repeat the cycle at high frequency and you get net heat pumping.
3. Why It Matters for Power Electronics

• 100% solid‑state (no compressors, no refrigerants)
• Potentially high efficiency near phase‑transition temperatures
• Scales well with multilayer capacitor manufacturing
• Suitable for chip‑level thermal management
• Demonstrated temperature lifts >10 K in some device architectures

Relaxor ferroelectrics like PST, PMN‑PT, and related materials are currently among the strongest EC performers, especially when built into MLC structures that allow high fields at low voltages.

[Clugh]

Something I find interesting and somewhat new in power electronics are PST MLC's

What Are PST Multilayer Capacitors?


A PST multilayer capacitor (MLC) consists of:

• Many thin alternating layers of PST ceramic and internal electrodes
• A stacked structure that allows high electric fields at low voltages
• A macroscopic working body suitable for electrocaloric cooling

These devices are often manufactured by companies like Murata, which collaborates with academic groups on PST‑MLC research.

PST multilayer capacitors are being explored for:

• Electrocaloric cooling modules
• On‑chip thermal management
• Energy‑efficient refrigeration
• Solid‑state heat pumps

Their compact size and compatibility with existing capacitor manufacturing make them especially attractive.

[Clugh]

Spulen-Halbacharray



More information about a dc coil based Halbach array. Its nothing new. They don't use it because the dc excited coils suffer high losses.

Creating a Halbach array requires rotating magnetization vectors around the circumference. With permanent magnets, this is easy—just orient the blocks.

With coils, you must:

• Shape the coil geometry to produce the correct vector field.
• Drive each coil with the correct DC current magnitude and polarity.
• Manage heat, since copper coils dissipate power continuously.

This becomes:

• Bulky
• Inefficient
• Expensive
• Control‑intensive

Unless you use superconductors (HTS), the losses are too high.

Yes, coil‑based Halbach arrays exist, but only in research or specialized applications. The only practical implementations use HTS coils or patented electromagnet arrays, not conventional copper DC windings.

A pm based Halbach is much simpler and compact. It does not suffer from additional excitation losses. The hybrid wound BLDC are even simpler than that.

There are also other applications for a coil based Halbach array.


INTRO:

"Since 20th century, superconducting magnets have become one of the most beneficial superconducting applications, which are widely utilized in Magnetic Resonance Imaging (MRI) and other biological equipments [1]. Superconducting magnets are able to generate magnetic fields with desirable h o m o geneity and strength up to tens of Tesla ."

You may read for yourselves.....

Optimization Study on the Magnetic Field of Superconducting Halbach Array Magnet

Boyang Shen*, Jianzhao Geng, Chao Li, Xiuchang Zhang, Lin Fu, Heng Zhang, Jun Ma, and T. A. Coombs** Electrical Engineering Division, Department of Engineering, University of Cambridge, CB3 0FA, UK

[Clugh]

If you enjoy tinkering and want to build a high-torque machine without magnets and with less control complexity, consider a 12/8 DC-excited flux switch machine. The topology is simple, featuring 6 DC field coils and 6 armature coils with a laminated rotor. This would be a very eazy machine to have the laser house cut. It also has a much higher rpm tolerance mechanically. On this one the engineers dove tailed the rotors teeth. IEEE approved as a viable form of e traction that would be more affordable without the rare earth.