Electronics issue
 

totally stumped. Bought a drag car off ebay. Was setup with Traxxas motor/esc. I wasn't happy with that so changed to lrp 4.5t/ hw xr-10 pro and a sanwa mt-44. Now, squeeze the trigger and wheels spin backwards. Cant find reversing throtyle in the e radio or esc. My last option is to pull the tranny apart and put the motor on the other side. Was hoping someone new an easy fix before breaking it down? Tried 2 motors and 2 diff esc and the same shit. Anyone??

I think your gonna have to go into the esc and change rotation if its a non sensored motor you can switch any 2 wires on esc to motor that will change rotation of motor

If the brushless setup is sensored you cannot swap the wires. I think the XR10 pro you have to run sensored. Swapping might work for a few minutes and then let the smoke out.

MT-44 can easily reverse the direction.
https://www.manualslib.com/manual/12...4.html?page=27
Last alternative is you can run the throttle calibration backwards!

Brushless motor, either do one of two. Switch over motor cables A and C, or change direction on TX of the MT4

Again, if it is sensored no way you can swap cables unless you want to burn the whole thing

I clearly wrote 1st thing was to go and change esc rotation... and clearly said IF NON Sensored change esc to motor wires . Helps is a op know or reads his manuals 1st. try that the esc rotation can be changed ccw/cw.. I dont deal with hw so I dont know what this requires more than likely a card.no way to let the smoke out by changing wires from esc to motor in a sensored motor .only result will be cogging.

I clearly wrote 1st thing was to go and change esc rotation... and clearly said IF NON Sensored change esc to motor wires . Helps if a op knows or reads his manuals 1st. try that the esc rotation can be changed ccw/cw.. I dont deal with hw so I dont know what this requires more than likely a card.no way to let the smoke out by changing wires from esc to motor in a sensored motor .only result will be cogging.it clearly says in many online at many stores try amain in esc options #11 says .change from ccw/cw

In my experience when you swap the wires on a sensored setup the motor and esc will run very hot in a manner of a minute with no load. Fortunately I caught my mistake on the bench but if I don’t think it would of lasted very long under load.

Hobbywing has a option to switch motor directions.. like #11 or something.. Takes a few minuets by ESC switch, faster with a programmer..

Most HW’s use the same basic option table.

Don't ALL known brand escs have the ability for motor direction change to normal or reverse? No way that sanwa radio doesn't have the option to change orientation of steering or throttle. All rtr $40 radios has the option to reverse directions for steering and throttle, so no way that a $300+ radio wouldn't.

If I have a sensored motor and a sensored supporting ESC, I don't need a sensor cable actually plugged in to switch the rotation do I?

The setting on the xr8 to switch from CCW to CW isn't dependant on the sensor cable being present is it? I presume just dependant on you wiring a to a, b to b and c to c.

Im asking merely for interest, I don't need to do this.

Contrary to popular belief at least with hobbywing esc's that i have used they don't have the ability to reverse rotation. The hall effect sensor placement i guess makes it to difficult to overcome in software.

https://cdn.shopify.com/s/files/1/01...84639635275888


Even in the manual under troubleshooting for a sensored setup the motor HW basically states you cant do anything to reverse rotation if your setup requires a rotation that doesn't match the more popular chassis setups - although I do think you should be able to do it in your radio.


Found this out there as well as an option to trick your ESC into working with a reversed setup and sensored motors

https://teampowerproducts.com/blogs/...ushless-motors

No you do not need to run the sensor - looking at that manual it seems to default to the sensor-less software that is built in to manage that without even changing the setup.
The CCW/CW is probably dependent on the cable not being installed but the manual doesn't say one way or the other.

You will need to use a sensor cable when installed in rc or bench testing it. you wont need it for programing esc with card or without..and this hw esc can be used ccw/cw.

well this seems to support an argument that i had about reversing direction. it appears that it is possible to reverse direction and in the exact same method I postulated as possible. so either the back emf does come in correctly in reverse or its not used in a sensored application. seems like it would be easy enough to diagram the rising and falling edges of a coil versus sensor arrangement.

Where to learn more about electronic ?

Well, to be precise, it is possible to swap two wires, but you also have to swap two wires of the sensor cable. After that, the timing of the sensor board has to be adjusted accordingly.
1) switch motor cables B and C
2) switch Hall sensor A and Hall sensor C which is #2 and #4 on the sensor cable (if you have a ROAR certified cable)
3) adjust the timing of your sensor board which might not be possible without doing some modification.

If you mean putting the motor and the main gear to the other side, don't bother, that won't change the rotating direction of the wheels.
Andi

here GB..
Electric RC info, how-tos and such - TJinTech

Hello!

I am not expert for electronic components, so I have next question. I decided to place a JR 2 lead on/off switch between receiver and cooling fan for brushless motor. It is these OK, because I do not want to burn out something? In summer time is cooling of brushless motor needed but in the winter time the cooling is not necessary so instead of disconnecting plugs out of the receiver I decided to place on/off switch.

On/off switch:
https://hobbyking.com/en_us/2-wire-r...en_us_products

Thank you.

No problem whatsoever with using a switch inline for a motor cooling fan.

But why not let the fan spin?

I have installed heatsink with fan, so I think that the fan is not needed in wide open tracks where is not so much acceleration of brushless motor and the motor is not heat so much, so maybe if I switch the fan off I will save some energy for racing.

The fan is not even taking 1% of the energy the motor draws, you will not save a thing.

No, some of my Hobbywing ESCs don't support it. My LRP doesn't either.

Reversing the channel on the radio doesn't change the motor direction on a sensored ESC. The calibration phase will determine whether a high or low signal is throttle.