Reversing rotation of an HV Maxx?
 

Hey,

Is it possible to reverse the direction of an HV Maxx?

This if for a custom built truck. I am finished and trying to test run it and, when building the drive train, I never considered the motor direction because I am so used to sensorless systems.

Any thoughts?

Matt

switch any two power wires

Apparently you do not know about the HV Maxx. It is a sensored motor/ESC. You cannot just reverse two wires. The sensors will not allow the reverse rotation.

Matt

i know its a sensored, and it is possuble to reverse it , the sensor only reads ticks on a wheel for rpm.. anyways if it was, you wouldnt have reverse

You could flip the diffs, but you may need to take the whole vehicle apart to do so.

Brushless boy,

I do not mean to be rude, but you do not know what you are talking about. The reason it has reverse is in the software as well as wiring.

It is not a step system it is a true position sensing system. If two wires are reversed, it just hums. I began experimenting with the sensor wires and it will reverse, but very unreliably (sometimes it wants to go forward).

So, I want advice from someone who has actually done it if it is possible.

I have a Neu 1512 I can use with either a Com Pro or a Mamba ESC. But, this truck is used for low speed crawling as well as bashing. Sensored systems are more accurate at very low RPM.

Anyway, I went back to stock wiring and have been running it with the funky delayed setup that the HV Maxx uses in reverse and the truck runs well. So, I may go ahead and use my Neu and Com Pro so I can drive it. Plus, that motor/ ESC has alot more power than this HV Maxx does.

I would still love to reverse this, though.

Oh, I cannot flip the diffs in this truck. It uses TXT axles.

Matt

Hey Matt, From what I have read you can't reverse the motor. Now you may be able to remove the sensor assembly and flip it over and then swap 2 of the main wires, but that is just speculation by me. I am also guessing that you cannot flip the axles over? It is kind of annoying that the software does not have a feature that wil let you reverse the motor's rotation. Novak should have built that in, or offer some sort of software fix.

Maybe you could program the esc backwards like instead of going to full throttle first go to full brake, then full throttle, then neutral. It's worth a try.

Jeff, not a bad idea! Wow, thinking outside the box. I will try that.

I went ahead and installed my Neu with the Mamba ESC. This thing freaking rips! Jeeze, it is crazy for a straight axle truck. :D

I will start a thread on the truck soon (maybe tomorrow). I am burned out working on it. I have somewhere in the neighborhood of 300 to 400 hours in this thing.

Anyway, I must say, that stupid HV Maxx sucks. The ESC runs hot, the motor runs hot, the wires get hot all without a huge amount of power. The Neu with the Mamba ESC runs smooth, quiet, cool, and has crazy power.

The HV Maxx must have terrible efficiency.

Matt

srry about that MM, i was wrong :D no hard feelings

Jeff? Who is Jeff?

No big thing! ;)

Matt

Jeff, Jerry, same thing! :mdr:

Matt

Yep, exactly the same only different. http://smilies.vidahost.com/otn/confused/ne_nau.gif

Hey, that's a definate maybe. Sort of light black? Kind of cold but in a hot sort of way.

Hmm, "Exactly the same only different." That logic sounds alot like talking to my wife. :mdr:

Matt

I have a wife too, and it is difficult.

Were do you think they came up with the "C" word? It means: Can't Understand Normal Thought:tongue:

I heard that one only it was Normal things. lol

I like when Chris Rock said "You cannot beat a woman in a arguement. It's impossble you will not win. Cause men, we are handicapped when it comes to arguing cause we have a need to make sense!":lol:

depending on the custom truck you can also turn the tranny 180. I had to do this in my G2R. Got it all set up, hit the throtle and the damn thing almost broke my ankle!

This CAN be done, I did it with my LRP TC/orion 10.5 set up because I was bored

Swap any 2 phases, for EX I swapped A with B, and then swapped the sensor wire that goes to phase A and B, and it ran in the opposite direction

its quite simple

I would think it would be. But, I did a bit of Googling on this and it looks like there is some sort of timing issue with the HV Maxx that messes with it.

In any event, my 1512 seems to be ALOT better suited to this anyway.

I will be starting a thread on the truck soon. I have posted pic of it. But, it has be about 80% reworked since then.

I have been running it in the house with very good success. I have had a few set screws loosten and the rear wheel screws loosen up easily (TONS of torque). But, it is proving to be a good runable design, not just a shelf queen. :mdr:

I am just messing around with the wife comment. I love my wife tremendously. The problem is, she is becoming like her mother and THAT I will absolutely NOT allow! So, I am going through a bit of a "You won't treat me that way!" and "What happened to the woman I married?" kind of thing.

Matt

You don't have a wife, you have a monkey butler!

Mod Man - A while back I had email conversation with a Novak tech who told me straight up that the HV Max cannot have its rotation reversed. EVEN IF you took it apart and flipped over the hall sensors AND swapped the sensor wires. I tried it anyways and I was successful in modifying the motor, but - it didn't run correctly. There is a timing system in the firmware that further prevents modding like this.

I wish, I am not rich enough to afford a monkey bulter, mainly due to the wife! HAHAHA

But a man can always dream of the day a chimp in a tux brings him a glass of cognac and greets the guests!

I posted the question on rctech, and bob novak told me the same

But it worked for me....:na: But not with the HV

What about some kind of 1:1 small gearbox that attaches to the front of the motor, to reverse direction that way? It doesnt like heavy vehicles though, that is for certain :whistle:

Anything is possible. I was merely hoping to find a relatively easy way to reverse the direction. I can make anything I want for it. The tranny and transfer case were made on my CNC. But, again, I was looking for something simple.

I am totally thrilled with the Neu anyway.

Matt

simplest way is to turn the tranny 180 degrees, make the front the back and the back the front!

^+1.

There are two approaches to reversing direction: mechanical and electrical. We know we can't electrically reverse the motor leads, so that leaves flipping the diffs, reversing the tranny, or somehow adding an idler gear. I suppose you could change the mount and add an "intermediate" gear between the pinion and spur - kinda like how the inside of the emaxx tranny works...