Chris Bebensee
10 µW
Hi everyone. This is my first post and I just want to say I'm happy to have found such a group of knowledgeable people. I recently got a Mototec 48V 1500w dirt bike. It has a brushless motor, but the control mechanism is speed based. What I mean is, with the variable throttle, as I advance it, it sends a 0-5V signal to the controller that apparently corresponds to an RPM that the speed controller tries to maintain. The problem is, the transition is instant instead of torque based. It's "All or nothing" until it reaches that RPM, then just maintains it. Trying to accelerate smoothly with partial throttle doesn't work and it's like a maniac until it reaches the set RPM. The bike has enough power to easily spin the wheel or pop a wheelie if you aren't paying attention, so the fact that I can't modulate the response with throttle is unfortunate. The controller does have a max speed setting and a "response time" setting, but that just makes it worse, because it just adds delay from when it tries to spin you out or put you on your back, making it even less predictable.
What I want is a torque based approach, so that throttle just commands either voltage or current to the phases of the motor, much in the same way that a decently high end RC car speed controller would. Current limiting could function as a sort of a traction control if too much power was added. This would make handling the bike much smoother and linear in operation and very suited to any surface including low traction like dirt.
To that end, I've been looking at VOTOL EM-50 and EM-100 controllers. They seem pretty reasonably priced and they are programmable. Would anyone recommend them or have a better option for a relatively cheap but decent upgrade for this bike?
Thank you all for your time,
Chris
What I want is a torque based approach, so that throttle just commands either voltage or current to the phases of the motor, much in the same way that a decently high end RC car speed controller would. Current limiting could function as a sort of a traction control if too much power was added. This would make handling the bike much smoother and linear in operation and very suited to any surface including low traction like dirt.
To that end, I've been looking at VOTOL EM-50 and EM-100 controllers. They seem pretty reasonably priced and they are programmable. Would anyone recommend them or have a better option for a relatively cheap but decent upgrade for this bike?
Thank you all for your time,
Chris
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