Hello all, just getting back into this after a long break. Can anyone tell me if Keywin is still selling controllers ? I tried to email him but got no response. Also, would anyone have any technical info on his 36v 9 mosfet brushless controller ? having a bit of trouble with one. At any rate thanks for letting me back in and any help.
Keywin Controllers
- Thread starter Scooty
- Start date
Haven't seen Keywin / ecrazyman posted about in years (there's way better stuff out there than what he used to have back then, depending on the features you need).
What specific information are you looking for about the one you have? The old ones are pretty generic.
What specific information are you looking for about the one you have? The old ones are pretty generic.
Hi, ya I was wondering if he was still around since he did not respond to my email, however the email did go through. This is the problem I'm having and I will try to explain as easily as possible.
I have two kollmorgan 400w motors with two 36v 9 mosfet ecrazyman controllers, I believe they are 500w. One unit is on my recumbent and the other is on my mobility scooter. That being said the problem I'm having is that the recumbent runs almost silent but the scooter has a high pitch scream that is very annoying. As stated these units (setups) are identical. Having been a tv repair man since 1995 I have a pretty good understanding of electronics but I must admit I'm afraid I'm at a loss here. Easy way out would be replace controller which I may do anyway but that would not answer my question about existing controller. In the event I choose to replace the controller what would be a good choice now days ?, no bell n whistles just a simple controller, I would prefer not using the hall sensors but is not a problem. Anyway, Thanks for the reply.
I have two kollmorgan 400w motors with two 36v 9 mosfet ecrazyman controllers, I believe they are 500w. One unit is on my recumbent and the other is on my mobility scooter. That being said the problem I'm having is that the recumbent runs almost silent but the scooter has a high pitch scream that is very annoying. As stated these units (setups) are identical. Having been a tv repair man since 1995 I have a pretty good understanding of electronics but I must admit I'm afraid I'm at a loss here. Easy way out would be replace controller which I may do anyway but that would not answer my question about existing controller. In the event I choose to replace the controller what would be a good choice now days ?, no bell n whistles just a simple controller, I would prefer not using the hall sensors but is not a problem. Anyway, Thanks for the reply.
Is the noise from the controller or the motor, or from the drivetrain components? (chain or belt drive?)Scooty said:
Bearings can fail with a noise like that; a drop of oil on them may silence them for a while; might be a permanent fix if they'r enot damaged but just dry. If it's a bearing, it's usually the one on the sprocket end. Bad caps often have swollen "domed" ends, even when not actually ruptured.
Capacitors in the controller can fail, usually the largest electrolytics, and then they don't damp the PWM oscillations. Noises from those will be louder under higher loads.
Unlikely to be windings in the motor.
Probably not a battery issue.
Potentially a poor phase connection could arc under high current load, but you'd probably have noticed heating damage to the connectors.
If you dont' find a bearing or cap problem, you could try swapping parts between the two to troubleshoot (starting with the controller, since that's probably the easiest).
There's plenty of sensorless controllers out there, even some that autoswitch to sensorless if the halls fail or aren't present. Some do a lot better job than others.
But really, almost any controller out there that meets your system's votlage and current requirements, that is sensorless-capable, would do. Whatever you get will still have to have the wriing figured out, as it will almost certainly be different colors, connectors, etc, than what you have now.
KT (kunteng) and Lishui (LS) controllers are decent, but a bit more than basic, with options for displays and settings and stuff.
Some sellers are better than others if you have a prpblem, but if you just want cheap...any will do that meet your needs. If price is not a factor, but you want the possibility of warranty or support, ebikes.ca or em3ev have basic controllers (but they cost way more than generics from wherever). the Grinfineons use sensorless or sensored, and are sinewave when sensored (but trapezoidal when sensorless).
I have replaced all bearings even in the motor along with chain and all the mechanical items that could be possible culprit, this is definitely electronic (motor) noise. I also suspect a cap(s) and in fact have checked with esr meter but in circuit, I believe my next move will be to take them out of circuit and check with the sencore bench analyzer as time allows. As far as for a new controller I see I will have to do some leg work lol. Again thanks for the help. I will post my findings with the caps.
