Alternative motor windings and drive schemes

[Clugh]

what is the SHE or sub harmonic elimination commutation scheme AI?


"The SHE or selective harmonic elimination (SHE) commutation scheme is a technique used primarily in multilevel inverters to reduce the harmonic content in the output waveform. Key points:

• Multilevel inverters generate an AC output by summing up successive square waves with different duty cycles and phases. This creates unwanted harmonic content that needs to be addressed.
• SHE techniques involve two main approaches to suppress these unwanted harmonics:

1. Chopping or gating the drive signals to the inverter stages to target elimination of specific harmonic frequencies. 23
2. Adjusting the turn-on times and durations of the driving signals in the inverter stages to modify the harmonic content. This is referred to as SHE-PWM. 145

• These techniques rely on real-time sensing of the output waveform and a control algorithm that can optimize the timing and gating of the inverter drive signals. Optimization methods like genetic algorithms and particle swarm optimization are often used. 1
• Combining these SHE techniques with a secondary filter stage can produce a very clean sinusoidal output by suppressing higher order harmonics that are not eliminated by the SHE control. 1

In summary, the SHE commutation scheme is a powerful approach to selectively eliminate specific harmonics in the output of multilevel inverters, enabling a high-quality sine wave output to be achieved."

~AI~

She put some hyperlink references out there for the mouse-click

Enjoy them.🖕

BYE BYE
Hubert

[Clugh]

"This is a cheap Chinese skateboard motor (6374 rotor).
I want to power it with an 11 x 22 x 3 propeller to get my plane to 350-400 km/h. My plane will weigh about 7.5-8 kg. It is built in the "flying wing" design. 12S battery.The test winding 6+5YY gave 350 kv

p.s.
With the stock Sunnysky 4130 380 motor and a 15x15" propeller, I reached 290 km/h (180 mph) and a current of about 100 A. With an 11x22x3" propeller, the current was 130 A and the speed was 295 km/h (185 mph), but the engine started to smoke and went out."

~Sokil~

Ich finde es genial, dass der russische Tüftler nichts über seine 5340 verrät. Bekannt ist, dass er mit einer handelsüblichen 4130 fast 300 km/h schnell flog.

Ich wette, du bist WEG.

Du willst sowieso nur trollen lol!!! es ist keine Kobra !!

[Clugh]

Du suchst nicht danach. Es trifft dich, wenn du es mit DTP am wenigsten erwartest. Dann bringe ich Vacoflux X1-Kerne ein.

COTS A 10 +10 DD ist 320Kv

[Clugh]

Electric Motors Winding and Repair - HeliFreak

Übrigens, Dr., vielleicht ist Ihnen ein Modellbauer aufgefallen, der nach Bert gesucht hat. Das lag nur daran, dass ich es versäumt hatte, auf eine verpasste E-Mail zu antworten. Ich habe inzwischen geantwortet und die R. Green-Motoren liegen hier bei mir



Danke,
Hubert

[Clugh]

Ist Ihnen in Deutschland klar, dass die Hybridwicklung auch eine Art dualer Dreiphasenwicklung ist, die von einem Wechselrichter gespeist wird? Sie bewirkt dasselbe wie zwei um 30 Grad gegeneinander versetzte Motoren, ist aber dual dreiphasig. Sie haben eine dreiphasige Sternschaltung, die in Reihe mit einer anderen dreiphasigen Maschine verbunden ist, die wiederum eine Dreieckschaltung bildet. Wie sogar KI weiß, reduziert das die Drehmomentwelligkeit, senkt die Stromstärke und verbessert die Maschine deutlich. Warum also erzählt jemand Bastlern, die einzige verwendbare Wicklung sei eine zweilagige Sternschaltung? Warum sollte das jemand glauben? Dr. Okon hält seine Piloten von den wenigen Möglichkeiten fern, die sie haben, um einen Motor zu verbessern, der tatsächlich versagt. Das kann niemand leugnen. Sie sind alles andere als bombensicher.

Wenn er eine Drehbank hat, erscheint er mir etwas faul. Warum sollte er nicht den Lagersitz am anderen Ende ansenken, um ein weiteres Lager unterzubringen und dann auf Keramikhybriden umsteigen? Das bietet zusätzliche Tragfähigkeit zu einem niedrigen Preis. Wenn er sieht, dass die Rotoren versagen, warum baut er dann keine leistungsstärkere Maschine? Ist Dr. Okons aktuelle 5050-Parallel-Y-Wicklung der Inbegriff deutscher Handabstimmung? Wenn die Rotoren versagen, warum sollte ein Tuner dann nicht nach Lösungen wie verlustarmen halbmagnetischen Keilnuten suchen? Das ist eine kostengünstige Lösung, die die Steigung auf der rechten Seite ihrer Maxima reduziert. Er hat sein 3225-Leistungsdiagramm für 2023 noch nicht ausgearbeitet.

[Clugh]

He and his friends see this and they have nothing to say.

Lets see what AI knows about semi magnetic slot wedges.

AI what is a semi magnetic slot wedge in BLDC machines?

"Magnetic slot wedges are an important component in brushless DC (BLDC) machines that can significantly impact the performance and efficiency of the motor. Semi-magnetic slot wedges, in particular, refer to slot wedges that contain a mixture of magnetic and non-magnetic materials.

The purpose of slot wedges in BLDC machines is to securely hold the windings in place within the stator slots. This is crucial to prevent the windings from moving or loosening due to the high rotational speeds and electromagnetic forces experienced during operation. Traditional non-magnetic slot wedges can fulfill this mechanical function, but they do not provide any magnetic benefits.

In contrast, semi-magnetic slot wedges contain a combination of magnetic and non-magnetic materials, typically a mixture of ferromagnetic particles (e.g. iron powder) and a non-magnetic binder (e.g. epoxy resin or fiberglass). The magnetic component of these wedges can provide several advantages:

1. Reduction in slot ripple and harmonics: The magnetic wedges help to reduce the slot ripple in the air gap flux density caused by the slotted stator core. This in turn reduces the associated eddy current losses in the rotor due to the interaction between the air gap flux harmonics and the rotor surface. 12
2. Improved efficiency: The magnetic wedges can decrease the magnetizing current required in the stator windings to produce the desired air gap flux, as more of the air gap flux is available for useful power production. This leads to reduced iron (core) losses and improved overall motor efficiency. 2
3. Enhanced starting performance: The use of semi-magnetic wedges has been shown to improve the starting torque and reduce the starting current of large induction motors. This is particularly beneficial for applications with high-inertia loads. 34
4. Reduced torque ripple: In synchronous motors, the semi-magnetic wedges can aid in the reduction of torque ripple, which is an important performance characteristic. 5

However, the introduction of magnetic materials in the slot wedges also presents some challenges. The magnetic wedges are generally more expensive than their non-magnetic counterparts, and their mechanical properties, such as flexibility and fatigue strength, can be inferior. Careful selection of the magnetic material composition and production process is necessary to balance the magnetic and mechanical requirements. 24

Additionally, the impact of the semi-magnetic wedges on the motor's performance characteristics, such as starting torque, efficiency, and core losses, can vary depending on factors like the relative permeability of the wedge material, the slot/pole combination, and the overall motor design. Detailed analysis using both analytical and finite element methods is often required to fully understand the effects of the semi-magnetic wedges on the motor's performance. 34

In summary, semi-magnetic slot wedges in BLDC machines can provide significant benefits in terms of improved efficiency, starting performance, and reduced torque ripple. However, the design and selection of these wedges require careful consideration to balance the magnetic and mechanical properties and optimize the overall motor performance."

~AI~

[Clugh]

So why does Dr Okon keep lying to you all on open forums and through PM crying to the admins all over the hobby world to ban the information that last 10 years??


Not even AI has the answer!

[Clugh]

AND then......what composite craft modeler does not know carbon fiber blocks high frequency signals from their radio? The Dr doesn't have time to slide 12 pieces of CF sheet 2ooo -3ooo um thick cut in small strips in the motors to close the slot opening to see what happens but has time to paint bells and arts and craft pure aluminum wires pink that he know does nothing but add weight to the machines? Make it make sense....fellas. You will never see this PURE aluminum wound engine realized.....

In particular he has ruined the technical sections of the motor forums in America as far as I'm professionally concerned. He is not a professional in the field of electronics and that's fact.

We have a tendency to become idolaters of an individual because of a trophy they won years ago with 20 competitors present in the entire world versus ask them the right technical questions on a technically based motor forum. We will even go as far as to punish individuals that ask the hard questions VENDORS do not want to answer. Some MODS where bribed with a motor for a plane or helicopter, or simply site sponsor$hip!!!

Obviously the few modelers there on the German social media have fallen into this horrible trap.

Dr Okon does them a real disservice for ever flying any faster.

Thank you for your time and patience,
Hubert

[Clugh]

Electromagnetic Properties of Carbon Fiber


👁 Reads: 2444

Carbon fiber has been praised for its incredible strength, and low density coupled with flexibility, so it is one of those materials that are highly sought by many industries. However, its electromagnetic properties are equally as impressive and carry substantial implications for many uses. In this article, we will be describing the electromagnetic properties of carbon fiber, analyzing what sets it apart from other materials and what can be expected of it in the future. The Basics of Carbon Fiber


Carbon fiber is a very thin, strong crystalline thread of carbon atoms bonded together. These fibers with diameters of 5-10 micrometers are packed and twisted together to form threads that can be used to fabricate a fabric or impregnate a polymer matrix and be used in composites. Thus, the carbon fiber products obtained – carbon fiber fabric, carbon fiber rods and other custom carbon fiber products – demonstrate high strength indicators and low density. The peculiarities of carbon fiber products are due to the nature of the carbon atom. Its crystalline structure is somewhat like graphite and the carbon atoms are orderly arrayed, which make it conductive and possessing other electromagnetic properties. Electromagnetic Properties of Carbon Fiber


Carbon fiber exhibits several key electromagnetic properties that make it valuable across various industries. Let's explore these properties in detail:

1. Electrical Conductivity

Carbon fiber can conduct electricity because electrons are able to reely within the aligned carbon molecules. This characteristic makes it very useful in absorbing the static electricity charges, reducing risks of damaging sensitive electronic parts. Moreover, due to its electrical conductivity carbon fiber is useful in passing as a shield against electromagnetic interference (EMI). Examples include prepreg carbon fiber tubes, carbon fiber rods and carbon fiber sheets which offer high EMI shielding used in electronic housings to enhance the performance of several electronic systems.

2. Thermal Conductivity

Carbon fiber also has the benefit of conducting heat energy, which makes it useful in situations where heat control is necessary. Carbon fiber rods and sheets are incorporated in electrical and electronics devices where they work as heat sinks that help to regulate and dispel heat. Prepreg carbon fiber tubes are used in aerospace parts, satellites, and other products that must effectively expel heat to prevent damage, thus, meeting the standards of the industry.

3. Dielectric Constant

The ability of an element to conduct electric charge in an electric field is measured by its dielectric constant. Since carbon fiber lacks a high dielectric constant, it cannot hold appreciable electrical charge. This property is very essential in cases where the applications involve handling of high frequency electromagnetic waves, since such materials which have low dielectric constant are ideal for use as they do not cause a lot of signal loss or interference. For example, carbon fiber in aerospace engineering in the construction of radomes that need to have low signal loss.

4. Magnetic Properties

This phrase explains the extent to which a material may continue to retain a magnetic field within it. Because carbon fiber is non-magnetic, it has a low magnetic permeability. This characteristic makes carbon fiber suitable for application in areas where there is need to minimize magnetic interferences. For example, in medical equipment like MRI machines, components made from non-magnetic materials like carbon fiber rods and prepreg carbon fiber tubes are used to minimize the magnetic interference and improve the imaging process.

5. Reflectivity and Absorption

The composite material and surface polish affect carbon fiber's absorption and reflectivity. This ability of carbon fiber to both transmit and absorb certain electromagnetic waves makes it an excellent material for radar absorption and stealth technology. Its composite design thus has a likelihood to regulate its ability to absorb electromagnetic radiation, which is beneficial to the aerospace and defense industries.

Electromagnetic Properties of Carbon Fiber | NitPro Composites


BUT HE CAN GO AHEAD WITH THE PINK PAINT AND THEY CAN LOVE HIM FOR IT.

I have to go wind for F3A...

Bye Bye...

[Clugh]

This Clugh F3A Pyro 600 wound with 240C* wire is 1.08 mm in diameter Dr Okon and if they want to strap a 7 x 15 APC to it on 12s lipo they may but Ill be damned if tell a hobbyist on social media they will get any more than 5Kw usable out of it!

I have the propellers and can remanufacture them in carbon fiber if they think they can fly 500 km/h with it.

[Clugh]

Anyone that wants to pm me privately to ask questions about anything they see here in motors and controls or a project they have feel free. We can always build something in private.

[Clugh]

Hi,
I have a full set of 7X15E/P and 7X11E/P APC's for the drone plus another singular propeller of each for airplane projects on the way from APC direct. I'm still waiting for the torque cradle sensor, but I can get my hand on the I2C based hall trigger for the tach. I need to 3dp spacers to go between each EV cell so the Lexus EV buss bars and everything lines up nice and neat. A bench that truly takes accurate mechanical power measure is the most valuable tool I could ever have to know the real power and efficiency of a demigod motor .

[Clugh]

Hallo Dr.,

Ich sehe dich oben auf der Besucherseite. Du hast gestern den ganzen Tag gezeltet.

Es ist seltsam, dass sie glauben, mit deinem 3225 500 km/h fliegen zu können, während du im Syncloss-Thread behauptest, dass fast keiner deiner Motoren, selbst die großen, tatsächlich schneller als 575 km/h fliegt. Wie kann es dann sein, dass ein 3225 in einem anderen Thread im selben Forum fast so schnell fliegen kann wie ein 5050?






Thomas hat auch nicht ganz recht, warum Syncloss bei einem Drohnenmotor später auftritt. Er betreibt den Koptermotor nicht mit YGE, sondern mit einem Drohnen-Inverter, der deutlich mehr PWM liefern kann. Eine Erhöhung der PWM kann den Syncloss-Strom erhöhen. Viele Drohnen-Inverter können die zehnfache PWM liefern als der YGE, den du mit dem großen Motor verwendest. Syncloss tritt mit einem leistungsstärkeren Inverter später auf.

Und noch einmal: Der Schrittverlust könnte einfach daran liegen, dass du dem Motor zu viel Drehmoment abverlangst. Ein kleinerer Luftspalt ist bei einem langen Motor mit nur zwei billigen Lagern aus Thailand keine gute Idee.

Alle Geschwindigkeitsangaben von dir, aber kein Fahrtmesser in Sicht.

[Clugh]

AI how to you adjust a speed control for desynchronization in bldc motor?

"how to adjust a speed control for desynchronization in bldc motor

To adjust the speed control for desynchronization in a BLDC motor, you can use the following methods:

• PWM Control: Adjust the pulse width of the PWM signal to control the speed and torque of the BLDC motor. This method allows for precise speed control with minimal power loss.
  
  1
• Voltage Regulation: Change the voltage supplied to the motor's winding to control the speed and torque. This method is effective for controlling the speed of the brushless motor and makes it more energy-efficient.
  
  1
• Sensor Feedback: Use sensor feedback to detect the rotor position and optimize commutation timing. This is crucial for applications where jerky movements are unacceptable, such as in robotic arms or MRI machines.
  
  1
• PID Loops: Implement PID loops for load variations, which can help in maintaining consistent speed across different load conditions.
  
  1
  These methods can be applied in various industries, including robotics, aerospace, and automotive, to ensure high precision and stability in motor control.
  
  1

You see that Md.? At least AI knows what engineers know.

[Clugh]

[Clugh]

"Desync is one of the most common issues with FPV drones, and this guide provides a comprehensive overview of the causes and solutions. The steps outlined here should help you effectively address desync problems with your setup."...
~AI~

Do you see that eve AI knows drone motors desync just like the rest. It's the inverter control that makes the difference. Like your 40,000 rpm 10 pole 3225 turning is 250 Erpm and that is at the limit of a yge's commutation speed capability. 7 Kilo fundamental also generate alot of electrical noise but Croco world is too advanced for a slot wedge.

So Its likely user error if its not the raggedy inverter you use for the setup.

Get in the game bruder!

[Clugh]

"The video, "How to FIX Desyncs in 5 Minutes," provides a practical, quick guide on adjusting BLHeli settings like Rampup Power and Demag Compensation, which are often the first steps in troubleshooting desyncs in hobby ESCs"

~Gemini~

while crocoworld struggles with understanding this at your direction Dr. making false claims on the forums....

I guess there is value in AI for the hobbyist sake!!!

[Clugh]

Der Syncloss am Brushlessmotor - möglichst reines Wicklungsthema! | RC-Network.de

STARTED IN 2022. THAT'S 4 YEARS OF REVOLVING NONSENSE IN CROCOWORLD RALPH !

See the value of modern vehicles?

Even though I told you about the PWM and low inductance 6 years ago.

[Clugh]

~Gemini~

I also told you long ago if the resistance of the motor is indeed lower than the inverter you may run into impedance matching issues but again you do not listen and are very hard headed Ralph Okon.

Please enjoy the German social media because currently there is no technical value in the motor section of rc-network.de aka crocoworld!

Thanks,
Hugh

[Clugh]

BTW

Es ist schön, Alois wieder im Forum aktiv zu sehen. Vielleicht können er und Christian die Sache umkehren und den Fokus wieder auf Wissenschaft und technisches Know-how richten, statt auf rosa Krokodile.

Diese Leute müssen ständig in den Foren aktiv sein, um den Unsinn abzuschwächen.