minde28383 wrote: ↑
Feb 18 2018 6:40am
KLS7218S,24V-72V,200A,SINUSOIDAL BRUSHLESS MOTOR CONTROLLER $199.00 2.80 lbs
KLS7212S,24V-72V,120A,SINUSOIDAL BRUSHLESS MOTOR CONTROLLER $179.00 1.70 lbs
Sabvoton up to 95V 2,2kg ~210usd 80A, 100A, 150A versions (this is big controller)
There is one widely used controller (made by RU) with smart display but it is expensive (three times price as one of the above controllers)
Infineon ~70usd (some weakest and cheapest of above but still ok for the motor); there are more expensive Infineons up to 200usd and more and these are very good and popular too.
I'm using Sabvoton 72150 version (72v nominal, 150A battery amps). It is heavy, has better torque from start compared to Kelly and Infineon controllers, but it is big and heaviest of all above controllers.
There are more and more quality suitable controllers but above ones are most widely used.
Keep in mind that safely you can push into to the motor up to 70A battery and about 150A phase. Those digits can vary 20A maybe 30A to higher side depending on motor winding and bike&rider weight, before you start to get into overheat issues. It's not like controller has 150A and you push all them and it's ok; no it is not, the motor will get hot and will get less efficient end less powerful and magnets will get damaged in the long run unless overheat sensor will limit Amps before all this happens.
So if you buy most powerful controller you won't still be able to set it to max; so you might consider power vs weight vs size. But you can't go wrong with any of these above controllers unless it does not fit into you ebike frame due being too big.
Another important factor is to choose controller with temp sensor so that it would push fewer amps when a motor gets hot; it is called -
thermall management or similarly in various controllers.
All my mentioned controllers are not high end but best one of these are considered Russian controller. But anyways these are not high-end controllers too. Just regular controllers for masses and they are very good what they are and do.
And another thing is to consiller so called Field weakening (FOC); it is called variuos names by different manufacturers, but keep in mind that Kelly does not have it. FOC is need to get more speed but when it is actived motors gets less efficiant, - more wasted energy.
You got 72v battery, got mxus 3T with 17'' mc rim; you can reach max 80km/h and after FOC is activated you can reach 95km/h. yuo get hot motor and even more heat. If you hot high volatge battery you might even not need it.
Another thing to consider Kelly vs Sabvoton. Kelly cost a little bit less is smaller, less torque but only from start and it's Bluetooth adapter for your smartphone is only 8usd, on another hand Sabvoton Bluetooth adapter is 25usd and if you ship it separately after you buy controller, from CN, they ask 25usd for shipping, so 50usd overall, which is overkill, I can't find cheaper for a few years now.
Also Kelly has better usd graphic interface through PC and phone but Sabvoton is ok too. Infineon's GUI (the ones which have it) is good too.
Just accured into my mind, - can consider these controllers too:
SVMC/SSC72080 1500w 72V 85V 95V 80A 200A / $158.00
SVMC/SSC72100 2000w-3000w 72V 85V 95V 100A 260A 300A $200.0
If you go for most stealthy ebike than small Kelly is the way to go
If cheapest - some cheapest version Infineon 60usd
If most powerfull and cheapest - Sabvoton
If most powerfull and most expensvive Ru controllers
Not sure if you are aware but if you take interest about controllers you show know about this:
If you seek most of the motor than later on you will be able to upgrade it by additional colling by putting radiators around hub 60usd and ferro fluid (20 or 30 usd) which is injected inside motor, few ml. All this upgrade helps to shed heat but you need it only when you overpower/generate waste heat in first place. You don't push too much amps and you don't need this upgrade.