Determining/calculating Servo Torque

[SeanD]

I'm running a HS-5645 in the rear steering of my rig. Right now I've got my BEC set at 6.2 volts.

I've read on here that you can bump the 5645 up to 7.2 volts but, as expected, at the higher voltage it will wear out quicker (no surprise there)

My question is how do actually get an idea of what the torque is at the higher voltage. At 4.8 volts the 5645 is rated at 143 oz.in and 168 oz.in at 6 volts. Can you extrapolate what the torque would be at 7 or 7.2 volts givien these numbers?

Just curious.

(And before someone says "Why don't you just ditch the weak 5645 and get a 5955" - I probably will - when I kill my current units)

[whoodie]

Ideal electric motors have a linear relationship with voltage and speed.

As far as torque, let me think about it for a bit.

BTW your units for torque are wrong. Torque is force times a distance, not division

[Timmahh]

it appears to be 25 in/oz for the extra 1.2v from 4.8 to 6v, so 7.2 would be aroudn 188 in/oz. but alot of servos wont take more than 6v, and many RXs limit servo voltage to 6v anyways. so even if your ESC passes 7.2v, the RX will likely retain its 6v rating.

[SeanD]

There's a thread on here about a member who contacted hitec about higher voltages. He was told that yes the servos can handle higher than 6 but you run the risk of premature wear - go figure.

I wasn't aware that an RX could limit voltage. If so, that kind of defeats the purpose of running a BEC for higher voltages on your servos.

Just for the halibut, I may just up my BEC a few voltage notches to see what happens.

[whoodie]

You can run the BEC directly to the servo and bypass the Rx regulator.

[SeanD]

Originally Posted by whoodie

You can run the BEC directly to the servo and bypass the Rx regulator.

Am I correct in assuming that by setting up my CC BEC as per its instructions, I am able to ramp the voltage up and not be concerned about the RX?

[whoodie]

Originally Posted by SeanD

Am I correct in assuming that by setting up my CC BEC as per its instructions, I am able to ramp the voltage up and not be concerned about the RX?

No the instructions have the BEC powering the Rx. If you take the signal wire from the servo and plug that into the Rx, and take the + and - from the BEC and connect that to the servo, you will be powering the servo directly from the BEC. You will now have to find a way to power the Rx. You can hook back up the BEC power from the ESC to do that.

[SeanD]

Gotcha. I'll bear this all in mind should I decide to increase my voltage . I'm not really complaining about my current setup - I was just wondering how to get more oomph out of my steering!

Thanks