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T-REX 500
governor ( 9 replies and no anwers )
D.Magee

Key Veteran

kansas city mo.

Can some one explane to me how a governor works on a eletric heli?
How does it know what speed it is runing and (how do you set the speed you want it to run at)? Does it only work in idel up or how do you turn it on?

Thanks I have only used nitro governors.

01-29-2009 Over year old.
FlaG8r

Elite Veteran

Florida

You're talking about the gov mode on the ESC correct? From what I've heard you should avoid it like the plague, no need for it! Run a straight line, 100% in Idle up and you'll be happy.

Life is tough, it's tougher if you're stupid

01-29-2009 Over year old.
R38133

Key Veteran

USA

A govener on an electric heli is the best thing since sliced bread. You first need a ESC that has a govener that works Jazz, Jive ESC are famous for there GOV mode Castle Creations has been trying to update there software but to no avail. The head speed is set on the ground 0 pitch with a tach the ESC will monitor the motor speed and hold it within a very close tollerance. Less than 80 rpm This is all dependant on your setup ie; pinon, motor KVA, wats capible of being delivered by motor, battery C rating. A properly setup gov is a pleasure to fly and pilots who use curves and have the oppertunity to fly a setup gov system soon make the change.....

01-29-2009 Over year old.
Ben-T-Spindle

rrProfessor

Central Illinois

The nice thing about the Castle Creations software is that you can program the ESC (using your PC) for the exact headspeed you want for the three flight modes. Thatís definitely the most sophisticated software around.


With other brands you have to use a tachometer to set the headspeed.

... BTS

01-29-2009 Over year old.
FlaG8r

Elite Veteran

Florida

Why would your head speed flucuate on an electric? I thought that was only an issue with nitros?

Life is tough, it's tougher if you're stupid

01-29-2009 Over year old.
jetfixrguy

Veteran

Spring Hill, FL

Why would your head speed fluctuate on an electric? I thought that was only an issue with nitros?
when going into hard or tight maneuvers you loose head speed period. It doesn't matter if it's nitro or electric.

I am using the castle creations hv45 on my 500 and I really like it. I think the castle link is a must when really dialing in your heli.

01-29-2009 Over year old.
blbills

Key Veteran

Provo, UT

I've actually never used the gov setting on the align esc until recently. I'm setting up my 500 for some AP work and I wanted to see if gov mode gave me a more consistent rpm and it does. Much better than running into the steps on the esc while I'm just hovering taking pictures. And I haven't noticed any issues with the tail.

For 3d though I'd just recommend a straight curve at 100.

Brian

01-29-2009 Over year old.
HOMEPAGE  
D.Magee

Key Veteran

kansas city mo.

Thanks for all the good information .Sounds like the castle creations
would be a good way to go with the three diferent setings at the transmiter.But I allready have the stock one on and paid for
How do you set it up at acertin rpm?If I understand right you just set a flat curve of 100 and check rpm with a tack at 0 pitch on the ground and if that is to mutch change the pinion and beter yet set it so you are less than 100 so you have some head room Is this right?

01-30-2009 Over year old.
FlaG8r

Elite Veteran

Florida

I wouldn't even tach it...just fly and enjoy, what's the magic number you're looking for? I would think it's more important if your setting up a nitro, or checking to see if the gov on a nitro is correct. Otherwise, what's the diff if your running 2500 or 2600 on the Trex 500? Set it to 100% T curve, if it's not enough for you, get a bigger pinion or a better motor. If it's too much, drop the curve down, keep it simple.

Life is tough, it's tougher if you're stupid

01-30-2009 Over year old.
D.Magee

Key Veteran

kansas city mo.

My three Questions.

A stock align governor

# 1 how do you turn the governor on and off?
#2 how do you set the target speed?
#3 how does it know what speed it is running at?

I am going to try and answer them my self from what I have learned from this post and from my searches on runryder.

-----------------------(The following is my guess not a fact. )---------------------

Question #1 When the governor is turned on in the set up
It will turn on at a set input from the transmitter on the throttle channel.

Question #2 You have a flat curve for throttle say 100 100 100 100 100 on idle up.
You check rpm on ground at 0 pitch the speed control will see this as the
Minimum load in amp draw. More pitch would be more amp draw so as the lowest amp draw on the speed control in idle up this would be the set point for rpm. You would change this buy
Changing the pinion gear better to get a gear that would produce your rpm at a lower than 100 setting so the governor would have some headroom.

Question #3 The speed control would work on a reverse control. When you put the heli under more load with the blade pitch. The speed control would see more amp draw and then speed up the motor in per portion

All the math and parameters would be set up buy the factory of the speed control
Non-adjustable

Please if you know the answer to the three questions let us all know I have seen a lot of post here about it. Or any other facts about the governor.

If you have any other theories please fill free to tell us

01-31-2009 Over year old.
blbills

Key Veteran

Provo, UT

1) You turn the governor on and off through the initial programming of the ESC.

2) I would just tach the heli while it is in a hover to find the RPM you're going for. Most of us adjust our target rpm by running with a flat throttle curves at 100 (in non-governor mode) and changing the pinion. More teeth for more RPM and vice versa. For 3D with the stock motor 13t is a good compromise between power and flight time.

3) Your pretty close with how the gov works. It's all based upon the aprage that the ESC receives.

Brian

01-31-2009 Over year old.
HOMEPAGE  
R38133

Key Veteran

USA

A govener maintains headspeed throught all flight envelops ie; pitch changes + 0 - this interns keeps the tail blades rotating at the same speed. This reduces the load on the gyro, tail servo and maintaining cyclic imputs resulting in constant cyclic responce. This stable HS is a desired feture resulting in a smother flying heli. A properly set up gov will result in a longer flight times and cooler compoients.As of this time I am vary disappointed in Castle Creations feebel attempts in the governer operations of there ESC's My advise to you is get a Jazz 55-10-32 you will NOT be disappointed. The Align ESC should NOT be used in gov mode they are (**%^%#@@^%&)(*)(

01-31-2009 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

The brushless motors and brushless controllers that we use are also "sensorless". Early versions of brushless DC motor drives were dependent upon a separate sensor, usually a Hall effect sensor, and one or more magnets mounted on the rotation portion of the motor. (The Hall effect sensor and magnets are very similar to what we now use for governor sensors on nitro helis.

The speed controller could monitor the output of the sensor and determine motor RPM.

Advances in motor drive and control technology allowed the sensor and its magnets to disappear, and the speed controller can monitor something called the "back EMF" of the motor (EMF -- electromotive force) to gauge motor RPM.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

02-01-2009 Over year old.
avconslt

Senior Heliman

Houston, Texas

D. Magee,

You do need to set a flat curve on the throttle when using the govenor mode, however, I would set it at 90%, or no more than 95% to allow the governor some room to make the adjustments without the RPM falling off! If 90% or 95% on the flatline throttle curve does not give you the headspeed you desire, then increase the size of the pinion until you reach the desired headspeed!

Richard

o

02-01-2009 Over year old.
R38133

Key Veteran

USA

A good starting point is 75% up to 80 and down to 65 at 90-95 the ESC has NO ability to power up at high blade angles.
http://heli.dacsa.net/calculatorv2/Default.aspx

02-01-2009 Over year old.
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T-REX 500
governor ( 9 replies and no anwers )
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