in theory if the duty cycle can be limited to, for example, 50% duty in bldc control, this will limit the max rpm of the motor to 50% of the battery voltage * kv, because the effective pwm voltage to the motor will be limited to 50% of the battery voltage
FYI, lots of remotes provide this feature. Although the Hoyt Puck does it better than most.
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Their implementation is awesome. Love how doing that affects current and (at least on my RC ESCs) top speed as well.
Do you know which other remotes have this?
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Benchwheel remote has a low and high setting. Works really well
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The Torqueboards Nano, FlipSky VX1 & Vx2, the Benchwheel remote, most remotes in fact.
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All easily accessible like the Puck?
Yeah, to one degree or another, they are all buttons on the remotes.
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wait what?
VX1âs modes only changes the acceleration and NOT top speed. (Youâd still get to your top speed slowly)
@mmaner is saying the hoyt puck remote is the same
So there is still no way to have a vesc remote that has modes that adjusts acceleration AND speed? (Essentially what the chinese escâs do)
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My VX1 doesnt do that. Modes, across most remotes, function by limiting PPM output. Like the Puck, mode 1 is 70%, mode 2 is 85% and mode 3 is 100%.
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It does on mine? Wouldnât limiting the current mean that wind resistance will overcome power at some point, providing a soft speed limit for a VESC?
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The modes feature used by the METR Pro and Ackmaniac firmware allow you to control the absolute top speed. Is that what you are looking for?
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it takes much less current to sustain constant reasonable speed than is used during typical acceleration, so limiting speed in this way would limit your acceleration dramatically. and forget about hill climbing. the best way would be to limit the duty cycle to less than 95% in current control mode, in my opinion. limiting duty cycle to 50% is equivalent to changing the battery voltage from 12S to 6S, from the motorâs perspective, without sacrificing torque during acceleration, and without increasing the battery current required for that torque.
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this shows the effects of changing the duty cycle limit from 95% to 50%, without changing any of the other settings or hardware:
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VESC canât act like a Evolve ESC no matter what remote or throttle curve you use. Have to either get used to it or try something different.
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Yeah thatâs what I suspected. Thanks
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I finally got a good answer over at the vedder forumâŚ
@Chricious if you are using a dual controller itâs possible your 120a bat setting limits each motor to 60a batâŚ
if thatâs the case, then changing the bat setting to 200a and leaving the motor setting at 100a, would give you 100a bat and 100a motor per motor, which in theory would enable you to retain all your torque and have full throttle range and torque at the higher speeds.
if the bat setting you referred to is âper motor,â then it depends on what the following firmware limits are that the hardware developer chose in your particular firmware for your controllerâŚ
^CURRENT_IN would refer to the firmware battery current limit for your hardware
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& @murdomeek @mmaner @BluPenguin its possible changing this value could limit the duty cycle and max motor rpm to a chosen percentage of the battery voltage * kv:
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It doesnât matter what we do, we canât achieve a proportional throttle to speed ratio in current control mode, like it is in duty cycle mode or on other e-boards on the market. We need to reprogram something, or maybe get a pre programmed RC or waiting for a Vedder update. Iâm really wondering why this is not bothering anybody else.
throttle in current control doesnât control speed it controls torque.
suppose you are at constant speed on flat ground at constant throttle in current control and you start going up hill, you will slow down⌠more throttle/torque is required.
duty mode doesnât control speed it controls the percentage of time current is drawn from the battery
it sounds like you want the throttle to set cruise control speed with some kind of limited current ramping
the dead travel in the throttle is what I was trying to help you fix not turning current/torque control into speed/cruise control⌠neither current nor duty control will achieve what you want
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