Search found 1647 matches

by Hummina Shadeeba
Mar 10 2020 10:55am
Forum: Battery Technology
Topic: Fast Charging - What is the secret?
Replies: 33
Views: 1422

Re: Fast Charging - What is the secret?

Everyone uses their vehicle differently and has a different battery but hoping someone has some advice: I have a battery I mostly use maybe only 1/4 of its capacity before recharging and wondering what’s the best voltage to be using that 1/4 to have the most cycles. They’re 30Q cells. To keep it sim...
by Hummina Shadeeba
Mar 09 2020 9:43pm
Forum: Battery Technology
Topic: Fast Charging - What is the secret?
Replies: 33
Views: 1422

Re: Fast Charging - What is the secret?

What temp you figure is too high for cells to get when charging and can you just look to the cell temp as a guide to what deterioration is happening? What’s the best cell temp to start charging? I imagine there’s a lot of trade offs and you could go all out with cooling jackets but with cells being ...
by Hummina Shadeeba
Mar 08 2020 11:16am
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 2517

Re: maxing out phase amps

Justin has measured saturation on a number of motors, there's an old thread on the subject. http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=14494 It's hard to saturate a motor instantly due to the inductance of the winding, unless you have infinite voltage to drive it with. Justin found it...
by Hummina Shadeeba
Mar 08 2020 10:20am
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

I was just saying if ur battery wires are long enough it’s worth adding caps to protect the esc. Ron’s guide here, the foreign Ron, is the most thorough guide I’ve seen. The foreign Ron is a powerhouse of knowledge hard to be compared to favorably.
by Hummina Shadeeba
Mar 07 2020 9:12pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

Found it: https://www.rcgroups.com/forums/showthread.php?952523-too-long-battery-wires-will-kill-ESC-over-time-precautions-solutions-workarounds https://www.rcgroups.com/forums/showthread.php?952523-too-long-battery-wires-will-kill-ESC-over-time-precautions-solutions-workarounds/page58&pp=10#post24...
by Hummina Shadeeba
Mar 07 2020 5:34pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

I was looking for how long battery wires can be before inductance is a risk. The link I posted seems a good source of info related to that and i trust Ron’s info over there on rcgroups. The luge isn’t mine and posting here to help him get it going and not blow up. Don’t know what version of the vesc...
by Hummina Shadeeba
Mar 07 2020 3:07pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

You want to have some fun: add a limit to the current as done by the people in the link I posted
by Hummina Shadeeba
Mar 07 2020 12:04pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

Drone and bike esc don’t seem so different. Seems mainly need current limiting https://endless-sphere.com/forums/viewtopic.php?f=2&t=23882&start=25 I don’t know why u mention interference flippy. I was thinking the caps are for the battery wire inductance so as not to blow up bits in the esc. Actual...
by Hummina Shadeeba
Mar 06 2020 6:11pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

What’s difference? Drone or whatever seem to need an amount of caps per wire length and subsequent inductance.
by Hummina Shadeeba
Mar 06 2020 2:45pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

Actually I read cells benefit from less ripple but yea the point is mainly to protect the esc and keep it cooler besides
by Hummina Shadeeba
Mar 06 2020 2:16pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

I read cells create large capacitance due to their construction.
by Hummina Shadeeba
Mar 06 2020 1:29pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

Found it: https://www.rcgroups.com/forums/showthread.php?952523-too-long-battery-wires-will-kill-ESC-over-time-precautions-solutions-workarounds https://www.rcgroups.com/forums/showthread.php?952523-too-long-battery-wires-will-kill-ESC-over-time-precautions-solutions-workarounds/page58&pp=10#post244...
by Hummina Shadeeba
Feb 29 2020 12:09pm
Forum: E-Vehicles General Discussion
Topic: Leaving my power supply on all the time?
Replies: 4
Views: 269

Re: Leaving my power supply on all the time?

I think leakage current is standby current. Is 277va voltage alternating at 277? And u can do the math to figure at 120?

Sorry here it is
https://www.trcelectronics.com/ecomm/pdf/hlg480h.pdf
by Hummina Shadeeba
Feb 28 2020 7:13pm
Forum: E-Vehicles General Discussion
Topic: Leaving my power supply on all the time?
Replies: 4
Views: 269

Leaving my power supply on all the time?

How much power is my fanless 58 volt 9.6 amp meanwell supply using when plugged in to wall but not bike? I thought it would be cool but it’s always warm. I like to leave it plugged in. Has a wattsup wattmeter on end drawing guess maybe .05 amps no?
by Hummina Shadeeba
Feb 28 2020 12:21pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 3143

Re: what is cogging torque?

What Seems safe to assume: No windings in motor same cogging Many teeth and one magnet is lots of cogging loss Many teeth and many magnets is low cogging loss (assuming good ratio and high lcd) Iron losses will be more with the many magnets vs few (Another example of how iron losses in the typical s...
by Hummina Shadeeba
Feb 26 2020 12:35pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 3143

Re: what is cogging torque?

At the beginning of this thread, I think, I posted a paper on skewed magnets which has a similar result to skewed teeth. Interesting was the greatly reduced cogging but slightly increased iron losses making it seem cogging is not related to eddies r hysteresis..in their normal form, but it does brin...
by Hummina Shadeeba
Feb 26 2020 10:26am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 3143

Re: what is cogging torque?

Be nice to at least see evidence of what relation cogging has to speed if u have any or find any

This tool for just an hour would be nice
https://m.youtube.com/watch?v=MhoneulduAU
by Hummina Shadeeba
Feb 25 2020 11:48am
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 2517

Re: maxing out phase amps

It takes a long time to get the motor windings hot while you can saturate a motor’s stator instantly. Vedder’s new position control program he says will lose synch with 50 amps in a medium sized out runner due to saturation. I forget the exact size now but think was like 180kv. Makes me think when r...
by Hummina Shadeeba
Feb 25 2020 3:11am
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 2517

Re: maxing out phase amps

The electromagnets (the teeth of the stator around which the copper is wound) have a limit for how strong the magnetic force can become. More current generally means more force. Saturation is that limit, while the absolute maximum is a finite number, it's a gradual transition. You want to stay well...
by Hummina Shadeeba
Feb 25 2020 12:54am
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 2517

Re: maxing out phase amps

Bullfrog wrote:
Feb 24 2020 9:41pm
We are but anything that inhibits current flow will in turn inhibit the ability of the motor to react to the permanent magnets magnetic field.

neither of which has to do with saturating motors in my mind. what are you talking about.
by Hummina Shadeeba
Feb 24 2020 4:50pm
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 2517

Re: maxing out phase amps

Thought we were talking saturation which is a loss due to the magnetic field strength being at the limit of what the stator can produce no? Sure voltage is necessary to produce a current but I believe the current, amp turns and produced inductance, and stator size and shape and material alone determ...
by Hummina Shadeeba
Feb 24 2020 12:57pm
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 2517

Re: maxing out phase amps

Is voltage only relevant in that it is the source of the current that causes saturation or is there something about voltage exclusively that causes saturation? I thought was just current related
by Hummina Shadeeba
Feb 23 2020 11:55pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 1430

Re: Adding capacitors for long battery wires

For someone’s street luge with skate hub motors. Extending battery wires seems the easier way. When u say increasing pwm signal on the motor side of the esc reduces the ripple on battery side, saying one side effects the other, I guess the motor inductance/kv would be a factor too? never heard one s...
by Hummina Shadeeba
Feb 23 2020 2:27pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 3143

Re: what is cogging torque?

Why would there be distinction between free energy and self sustaining. It’s just degrees of efficiency. To be only just self sustaining and perpetual would be a lucky outcome and I’d assume if u could reach that point of sustaining then free energy is a milliwatt away