Greetings from the Netherlands

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Re: Greetings from the Netherlands

Postby Burgerman » 23 May 2019, 18:26

Because getting more amps requires a different controller and is, of course, very difficult, my dad and I came up with the idea to just double the voltage.


Since the limit in torque is the controller Amps, it doesenyt make any difference what battery voltage you use. The motors will have exactly the same stall torque, and it will occur when the motor voltage is around 4 to 7V in most cases. Depending on motor impedance. At this point, the controller throttle back, and will not allow the max amps to be exceeded.

The speed would double.
Controller stall amps and motor impedance determine stall torque,
Battery voltage determine speed. Your speed would double. But the controller will not survive, and will give errors and not work above around 32V.



The plan is to use 2 lithium batteries of 24 volts. We will power the motor with both batteries, 48 volts.

hOW EXACTLY?

And power everything else, my current controller as well, with one battery, which would be 24 volts, and the same as I currently have.
Do you have any thoughts on this?


tHAT WILL SEVERELY UNBALANCE THE LITHIUM BATTERY.
Sorry keyboard... :cussing
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Re: Greetings from the Netherlands

Postby steves1977uk » 25 May 2019, 00:07

99.99% of mobility controllers only work on a 24v setup Caz, and depending on how well the Q-Logic PM handles higher volts, it might error out when it sense an overvoltage of 30v+ or you might risk burning it out! :o

Also DC-DC step up voltage boosters between the PM and motors won't work since the chair will behave very erratically.

Steve
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Re: Greetings from the Netherlands

Postby Burgerman » 25 May 2019, 00:55

Not to mention that they will need to handle 120Amps and work from 0V to 26V. As a pulse width 26V signal. And in BOTH directions. I see much smoke in your future! :eh:
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Re: Greetings from the Netherlands

Postby CazSaa » 12 Jul 2019, 11:57

So, new plan.
I have been busy with school for a while but summer break is here, so I can continue with this plan.

BM, you said that your BM3 is not to be taken lightly because you have to build things such as the controller yourself. Because we don’t want to do this my dad came up with a different idea.

His idea is to use 2 different batteries, one with 24V and one with 48V. The 24V battery should all trivial stuff such as controller, lights and things like lift and tilt functions. While the 48V battery would only power the motors. This way we won’t have to make our own controller.
Any feedback for this?

Now I need to get into lithium batteries and the roboteq controller, which is gonna be hard.

Thanks.
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Re: Greetings from the Netherlands

Postby Burgerman » 12 Jul 2019, 16:35

Because getting more amps requires a different controller and is, of course, very difficult, my dad and I came up with the idea to just double the voltage. The plan is to use 2 lithium batteries of 24 volts. We will power the motor with both batteries, 48 volts. And power everything else, my current controller as well, with one battery, which would be 24 volts, and the same as I currently have.

Do you have any thoughts on this?


Yes. If you were to power the motor with 48V and no controller it will spit you out and destroy thegearbox.
If you were to power the motor with 24V from a standstil, same thing! The CONTROLLER moderates the current and the rate of acceleration. You cannot use it without this. If you try, the motors will hit 6mph in around 0.1 of asecond. And you will not be in it...
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Re: Greetings from the Netherlands

Postby CazSaa » 15 Jul 2019, 14:29

Burgerman wrote:
Because getting more amps requires a different controller and is, of course, very difficult, my dad and I came up with the idea to just double the voltage. The plan is to use 2 lithium batteries of 24 volts. We will power the motor with both batteries, 48 volts. And power everything else, my current controller as well, with one battery, which would be 24 volts, and the same as I currently have.

Do you have any thoughts on this?


Yes. If you were to power the motor with 48V and no controller it will spit you out and destroy thegearbox.
If you were to power the motor with 24V from a standstil, same thing! The CONTROLLER moderates the current and the rate of acceleration. You cannot use it without this. If you try, the motors will hit 6mph in around 0.1 of asecond. And you will not be in it...


I see now that I worded this poorly. I meant that I want to power the Q-Logic controller with the 24V, and try to make something work with a different controller between the 48V batteries and the motor. The roboteq controller for example, or maybe a different kind.

I hope this is more clear.
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Re: Greetings from the Netherlands

Postby Burgerman » 15 Jul 2019, 16:36

Not really.
1. What is the qlogics output used for? if the roboteq is connected to the motors.
2. And how do you power that qlogic, you cant take it from half of a battery?

I am saying, if you have a roboteq in charge, why would you want or need to also run a qlogic system?

Or are you thinking that you can use just the joystick, and stuff, to connect to the roboteq (you cant)?
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