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by Hummina Shadeeba
Jun 15 2021 12:36am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

I don’t believe cogging is due to eddies or hysteresis. The root of my problem was thinking cogging is not net-zero and is a loss. The motors I’d seen that coasted similar to a regular wheel I thought due to their not cogging but they must either have been slotless motors having very low flux densit...
by Hummina Shadeeba
Jun 14 2021 9:09pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Hummina Shadeeba wrote:
Jun 14 2021 7:44pm
if you were to run the two motors only externally, so essentially coasting, the slotless or skewered motor will take less power to spin the same speed right?
by Hummina Shadeeba
Jun 14 2021 9:03pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Hummina Shadeeba wrote:
Jun 14 2021 7:59pm

will an unpowered slotless hub motor being pedaled produce the same heat as an otherwise same motor but slotted? (same speed and duration)
by Hummina Shadeeba
Jun 14 2021 8:05pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

A stopped motor has no induced currents in its core try put a led across a phase bet you get nothing happen. Soon as it turns the emf builds up and the phase resistance increases with rpm, the emf grows in turn so the faster a motor turns the less current it can absorb by design but from a stall si...
by Hummina Shadeeba
Jun 14 2021 7:59pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

I've got an idea... Why don't you go and pedal really really hard for 20 minutes, and see what gets hot? If it is the iron, it's Eddie currents. If it's the suspension forks and tires it is the cogging transmitting vibrations into the frame. If nothing gets hot, pedal harder. i thought you said str...
by Hummina Shadeeba
Jun 14 2021 7:44pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Evidence. I have a motor, a small rc one. It takes 3.5A to make it start. Once started, a phase current of 0.1A will keep it spinning. There’s mass that needs to be put in motion. But don’t get upset folks if I’m critical of your input. I contrast it with my own experience and spout how I see it. B...
by Hummina Shadeeba
Jun 14 2021 7:30pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Evidence. I have a motor, a small rc one. It takes 3.5A to make it start. Once started, a phase current of 0.1A will keep it spinning. There’s mass that needs to be put in motion. But don’t get upset folks if I’m critical of your input. I contrast it with my own experience and spout how I see it. B...
by Hummina Shadeeba
Jun 14 2021 7:28pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

There's a loss to Eddie currents due to the change in magnetic field through the iron as Ian says, this is a result of Faraday's induction, or can be seen from Maxwell's equations where a changing magnetic field induces an electric field (and therefore a current where there's a conductive medium). ...
by Hummina Shadeeba
Jun 14 2021 7:25pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Magnetic braking isn't the same as cogging, but it occurs everywhere cogging does. Or u could have magnetic braking without cogging. Generally I think magnetic brakes are done with eddies although hysteresis is out there. But still the slotless motor not cogging..how is that possible? Maybe hystere...
by Hummina Shadeeba
Jun 14 2021 6:59pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

If cogging is being produced by eddies they would be astronomical in resistance at higher speeds with eddies being exponentially produced, no? Hysteresis? Maybe and the resistance seems more linearly produced but I don’t know. I’m not taking someone’s word for it as you’re telling me it’s eddies whi...
by Hummina Shadeeba
Jun 14 2021 6:26pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

You can get free energy Forget the term free energy if that’s too hard to swallow and don’t think I used that term. I think fair to say that the force of permanent magnets ADD to the force of the motor due to their orientation with no cost. So there’s potential for forces, such as gravitational or ...
by Hummina Shadeeba
Jun 14 2021 5:44pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Skewered or slotted whatever you want to talk about abs I brought up both. You’re free to bring up any design if you think it better explains. I’m not trying to trick anyone or impress but trying to figure what’s what and I don’t have the education..that’s what I’m here for. Indent torque isn’t the ...
by Hummina Shadeeba
Jun 14 2021 5:30pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

For an easier rolling system. For less current needed to produce the same unpowered “coast”. And I believe the cogging torque is present at all speeds so less power needed to overcome that cogging period. Theyre just questions. If u don’t have evidence that’s fine and don’t bother writing then. Aga...
by Hummina Shadeeba
Jun 14 2021 5:04pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Detent torque thank me later. Didn't mention slotless either just straight slot vs skewed we debated. Detent torque is the same thing as cogging torque. u get no thanks for that. I’m mentioning slotless now. Answer any question you want. Please explain how with a slotless motor, which has more iron...
by Hummina Shadeeba
Jun 14 2021 4:45pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

For an easier rolling system. For less current needed to produce the same unpowered “coast”. And I believe the cogging torque is present at all speeds so less power needed to overcome that cogging period. Theyre just questions. If u don’t have evidence that’s fine and don’t bother writing then. Aga...
by Hummina Shadeeba
Jun 14 2021 4:42pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

The loss of momentum would be down to the load connected if your referring to the back emf. im not Dead short the windings and the motor will lock up fast more electrical resistance and less torque can be scavenged till there infinite resistance as such open phase so differing batterys will regen h...
by Hummina Shadeeba
Jun 14 2021 3:45pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

For a cleaner back emf ? For a easier rolling system ? For less wear on the bearings ? For an easier rolling system. For less current needed to produce the same unpowered “coast”as a non-cogging motor. And also I believe the cogging torque is present at all speeds so less power needed to overcome t...
by Hummina Shadeeba
Jun 14 2021 3:18pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

What will “click”? When u spin a motor by hand it’s not going to reveal where the lost momentum has gone. But better yet just answer my questions directly. But what are you saying you would bring evidence showing? What complex formula? To move the motor from point a to b on both motors will take sim...
by Hummina Shadeeba
Jun 14 2021 2:47pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

I just asked above. You need to look two posts up: “ ur saying cogging’s loss of momentum is due to hysteresis or eddies or both? Do u have evidence? If the stator is skewered and results in almost no cogging are less hysteresis and eddies being produced? “ But please limit your response to relevant...
by Hummina Shadeeba
Jun 14 2021 2:39pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

So u won’t be bringing the evidence and instead rambling about what you vaguely know about after telling me I’m a fool. Get outta here with that. I had specific questions. Please answer them or don’t bother writing and not interested in simplified ramblings about things unrelated to the questions.
by Hummina Shadeeba
Jun 14 2021 2:18pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Changing the iron magnetic state in areas of the stator steel will result in heating of the material the iron will hsve a reflection back on the magnets themselfs giving a miniscule amount of heating on them the system has torque been applied to the steel in a none uniform fashion that creates wave...
by Hummina Shadeeba
Jun 14 2021 12:58pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

Cogging torque is the magnetic interaction between the steel and the magnet and if you csn prove there's more going... but ill tell you theres no missing energy That doesn’t tell where the energy went. As I understand it an esc must add current to overcome cogging torque. A motor with more cogging ...
by Hummina Shadeeba
Jun 14 2021 9:43am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

[no amswer to the shit you spout unless you design an answer to fit the box you choose to see Again you didn’t answer the question as to where the lost momentum of cogging went and continue w the same. I may be an idiot and incapable of understanding the most basic, but don’t say it and show it. Or...
by Hummina Shadeeba
Jun 14 2021 1:09am
Forum: Battery Technology
Topic: 40T, neodymium magnets, plasti dip cycle test
Replies: 170
Views: 14369

Re: 40T, neodymium magnets, plasti dip cycle test

Be nice to get the copper stamped or something. Looks nice except the sharp corners. Rather trim it to the shape of the magnet
by Hummina Shadeeba
Jun 13 2021 4:23pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 137
Views: 6651

Re: what is cogging torque?

[no amswer to the shit you spout unless you design an answer to fit the box you choose to see Again you didn’t answer the question as to where the lost momentum of cogging went and continue w the same. I may be an idiot and incapable of understanding the most basic, but don’t say it and show it. Or...