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New JR hall effect brushless servo - 4/20/2012 9:30 AM   
Turbotronic


 

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From: Cape Town, SOUTH AFRICA
Status: offline 		Another nice servo fro JR. I am hoping they employed a 360deg sensor. That would allow for infinite travel adjustment since there is no need for end stops anymore.
If only they could have made it 4.8 to 16V and programable that would be just perfect for all sort of applications.
Thanx JR, First DMSS and now this!
Andre


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RE: New JR hall effect brushless servo - 4/20/2012 10:13 AM   
bidrseed2


 

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From: billingshurstsussex, UNITED KINGDOM
Status: offline 		So what makes this better than what we currently have?

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RE: New JR hall effect brushless servo - 4/20/2012 11:05 AM   
Dave Wilshere


 

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From: Watford, UNITED KINGDOM
Status: offline 		The brushless servos are a big step, I have been using them in a few models for a while and I'm very impressed. No brushes to wear, faster start/stop (always guessed because less motor mass to start and stop)
The pot servos also have wear, and rely on contact points.

But as always, I'll need to long term test to know for sure.

Dave

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RE: New JR hall effect brushless servo - 4/20/2012 11:34 AM   
Turbotronic


 

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quote:

ORIGINAL: bidrseed2

So what makes this better than what we currently have?


There is no mechanical pot to fail. The previous brushless servos from JR still had mechanical feedback pots. The contactless Hall effect sensor only needs a small magnet on the output shaft to determine position. Combined with brushless motors it should be pretty reliable.
However the failure point of most servos and also JR I regret to report, is the servo amplifier output stage failing aka "burning" out.
So you may be right to wonder if this would indeed be better, but it has the potential to be very good when designed properly.



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RE: New JR hall effect brushless servo - 4/21/2012 12:21 AM   
PaulD



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quote:

ORIGINAL: bidrseed2

So what makes this better than what we currently have?


Mainly no sensor wear. Hall effect do not make good 360 deg sensors though and require temperature compensation esp with higher amounts of travel. Maybe there's a new generation out there that are better that JR is using that has less temp drift?

As far as first goes - I think Hitec already came out with digital servos with non-contact position sensing. "HS-M7990TH Mega Torque HV Magnetic Encoder Servo"

The other big advantage is stepless position sensing so the centering resolution is only limited by your electronics and gear slop.

PaulD


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RE: New JR hall effect brushless servo - 4/21/2012 8:37 AM   
Turbotronic


 

Posts: 334
Joined: 8/19/2009
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From: Cape Town, SOUTH AFRICA
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quote:

ORIGINAL: PaulD


quote:

ORIGINAL: bidrseed2

So what makes this better than what we currently have?


Mainly no sensor wear. Hall effect do not make good 360 deg sensors though and require temperature compensation esp with higher amounts of travel. Maybe there's a new generation out there that are better that JR is using that has less temp drift?

As far as first goes - I think Hitec already came out with digital servos with non-contact position sensing. "HS-M7990TH Mega Torque HV Magnetic Encoder Servo"

The other big advantage is stepless position sensing so the centering resolution is only limited by your electronics and gear slop.

PaulD


I am hoping for something at least as good as this.
http://www.austriamicrosystems.com/Products/Magnetic-Encoders/Rotary-Encoders/AS5048A



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