ZeroEm
1 MW
Have been using Grin's 40A Grinfineon, never had any issues.
ZeroEm said:Have been using Grin's 40A Grinfineon, never had any issues.
CONSIDERABLE SHOUTING said:What's the preferred controller for the leafmotor? Do most people just go straight for something high quality like the Grin Phaserunner?
spinningmagnets said:Thanks to everyone here for sharing the pics and data.
https://www.electricbike.com/leafbike-1500w-hubmotor-the-mid-sized-hot-rod/
Bullfrog said:One additional thing I'd like to add...ALL motors for a given design are capable of the same torque. There is no such thing as a "torque" winding" or a "speed" winding for a given motor design. The faster Kv will require more phase amps to produce the same torque as a slower Kv motor but they both supply the same torque if you supply the same battery amperage.
I have not experimented with the Leaf motor to see when magnetic saturation starts to be an issue but like Spinningmagnets said, I would estimate it starts to be an issue once you exceed approximately 50A-60A. Nice thing is a lot of batteries are limited to less than 50A-60A by their BMS and/or the cells used so the battery, the motor, and sometimes the controller as well are all limited to roughly the same maximum amperage before they start having issues. For anyone not familiar with Magnetic Saturation...it does NOT occur like an On/Off switch. It is gradual and all it means is more amperage will no longer give you the same torque increase as it did at lower amperage levels yet with the increased amperage, you get much more heat produced since the heat produced is proportional to the amperage squared and when the temp increases the resistance of the wires goes up which produces more heat so things start to get hot in a hurry once you start to experience magnetic saturation.
calab said:Thats a very good way of wording the super myth on hub motors.
I have only seen 40a and 50a maximum current bms' from the usual reliable builders, 60a would be nice
One thing I would like to clear up for myself after reading the articles link was a hint that its just amps
is it the current (a) or the total power (watts = v x a), one could have 36v40a and 72v20a with the same total power.EM3ev uses a smart BMS that will balance the cells as well as allow you to monitor the parallel strings voltage...so you can see 14 different readings for a 14s battery. You do need an Android device to load the app on. Their BMS has the trip voltage (circuit breaker) set at about 60A although they recomend keeping the amperage below 50A-55A...of course that is for their batteries with either 30Q or 25R cells which can put out that kind of amperage.
Not exactly sure what your question is regarding total power but all ebike motors have the torque proportional to the amperage and the speed proportional to the voltage when they are operating at their respective designed levels. It is only the amperage that contributes to magnetic saturation....since it is the amperage that determines the strength of the magnetism created by each pole.
Grin Tech has some good articles worth reading under the "Learn" tab on their home page...the one on Hub Motors helped me a lot when I was first starting out. Justin (Grin Tech Owner/Operator) also has some good youtube videos and these are two I'd recomend:
https://www.youtube.com/watch?v=dxJe_gygRGU&t=2930s
https://www.youtube.com/watch?v=c96n0Ma2rLY&t=6759s The discussion starting at the time mark 2:16:15 is something everybody should understand .
A complete list of the Grin Tech videos can be found on this page: https://www.youtube.com/c/GrinTechnologies/videos
And just FYI, Justin/Grin Tech funds and maintain this forum so we can all share information...so definitely worth supporting Grin Tech if possible.
Cowardlyduck said:I would say the phasrunner is fine for the 30mm motor. I use one on my RH212 with 3.3Kw peaks. Controller doesn't overheat since heat sinking it to my frame.
spinningmagnets said:What bearings did you upgrade to?
If someone is using a programmable controller, what are some various battery/phase amp settings for a 50A rated pack, and what are the results of the various settings?
DogDipstick said:spinningmagnets said:What bearings did you upgrade to?
If someone is using a programmable controller, what are some various battery/phase amp settings for a 50A rated pack, and what are the results of the various settings?
SKF Part number 6004/2RSH-LHT23/MB3, a ester base low/wide temperature greased, double side double lip, SKF Explorer deep groove with a machined brass cage in ABEC grade 3 with a 10 kN dynamic rating. ( I am not using the matched pair option, for this part number, even though that is an available part option. )
gobi said:What frame is this motor on?
Did you pre-service aka grease the bearing?
spinningmagnets said:If someone is using a programmable controller, what are some various battery/phase amp settings for a 50A rated pack, and what are the results of the various settings?
DogDipstick said:gobi said:What frame is this motor on?
Did you pre-service aka grease the bearing?
No. It is a ester base low temperature / wide temperature grease, in the bearing I paid for. This means it works form 0*C to 100*C. You can get the bearings pre packed with about five different lubricants.
Here is my build thread. My most recent photos. >>>>> https://endless-sphere.com/forums/viewtopic.php?f=6&t=103648
gobi said:DogDipstick said:gobi said:What frame is this motor on?
Did you pre-service aka grease the bearing?
No. It is a ester base low temperature / wide temperature grease, in the bearing I paid for. This means it works form 0*C to 100*C. You can get the bearings pre packed with about five different lubricants.
Here is my build thread. My most recent photos. >>>>> https://endless-sphere.com/forums/viewtopic.php?f=6&t=103648
Thanks!
I peek at leafbike website, and I see they don't mention winding # etc, are we able to order custom winding from leaf?
https://www.leafbike.com/products/e-bike-hub-motor/48v-52v-1500w-rear-spoke-hub-motor-electric-bike-motor-spline-cassette-1110.html
spinningmagnets said:The 4T is what I recommend, even if you travel at speeds that are "half throttle". It took years for me to get it, but...more copper cross section in windings will run cooler because of less resistance.
by spinningmagnets » Mar 11 2022 1:02pm
The 4T is what I recommend, even if you travel at speeds that are "half throttle". It took years for me to get it, but...more copper cross section in windings will run cooler because of less resistance.
Copper has more resistance when its hot. Therefore, if you are running just warm, fine....but...once you get hot, the same amount of watts as before will keep it hot.
26 inch wheel, 2-inch tire, 52V and 4T winding will do 40-mph. Thats a good thing, even if you normally travel 20-mph, because...
Sometimes 3,000-lb cars try to kill me.
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