Author Topic: EEVblog #435 - 3D Rocker Teardown  (Read 9258 times)

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Offline EEVblog

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EEVblog #435 - 3D Rocker Teardown
« on: March 05, 2013, 01:26:12 pm »
You know you want to see what's inside a 3D Rocker Platform.
TDA2806A: http://eevblog.com/files/TDA2086A.pdf
T410-600 TRIAC: http://www.mouser.com/ds/2/389/CD00002383-108813.pdf



Dave.
 

Offline Rufus

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #1 on: March 05, 2013, 03:02:12 pm »
The motor is AC induction, shaded pole or something typically used in stuff like fans. You can do crude speed control (or probably torque control) by triac phase angle switching to reduce the effective AC drive voltage.

The TDA2086 is a triac phase angle motor controller more typically used with universal brushed motors (dc motors with field magnet coils which allow them to run on AC). The biggest application was probably for washing machines which need high speeds for spinning and accurate low speed for the wash cycles. 

Made by GEC Plessey Semiconductors and obsolete. The TDA1085 by ON Semiconductors is a similar part which might still be available.
 

Offline mikeselectricstuff

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #2 on: March 05, 2013, 05:18:10 pm »
Made by GEC Plessey Semiconductors and obsolete. The TDA1085 by ON Semiconductors is a similar part which might still be available.
Of course nowadays you'd do it with a small PIC  or similar.
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Offline N2IXK

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #3 on: March 05, 2013, 09:54:16 pm »
These things are PERFECT for agitating an etchant bath for folks who make their own PCBs.

Was surprised to see any kind of feedback loop at all. I've had to repair a few lab stirrers and whatnot over the years, and most of them ran straight open loop phase controllers, similar to an incandescent lamp dimmer.  The really simple ones simply used a large (25W or so) wire wound rheostat in series with the motor.
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Offline AlfBaz

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #4 on: March 05, 2013, 11:26:18 pm »
That bar just seems to stop the tray from rotating
 

Offline Ed.Kloonk

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #5 on: March 06, 2013, 02:52:20 am »
Dave, give the thing to Photon. He could perhaps attach a "choke-a-chicken", liven up the tray and give the motor a few thousand volts.

I want flames.

 :)

 

Offline drewtronics

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #6 on: March 06, 2013, 04:42:40 am »
I was really kind of disappointed in that choice of teardowns. Where's that awesome old phone from the mailbag the other day? way cooler.
 

Offline G7PSK

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #7 on: March 06, 2013, 10:57:29 am »
You will never have to find a stick to stir paint again. The post at the corner is to stop the plate from spinning the piece at the center is just a face cam, usually a ball bearing mounted onto the shaft at an angle such a system is also called a wobbulator by many in the mechanical world very often used in hydraulic pumps and motors.
 

Offline Skimask

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #8 on: March 06, 2013, 02:17:56 pm »
I still thinks it's a 2D rocker, because over the course of a revolution, the center of the platform doesn't move in the Z axis...
But that's just me...I'm weird that way...
I didn't take it apart.
I turned it on.

The only stupid question is, well, most of them...

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Offline Len

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #9 on: March 06, 2013, 04:52:23 pm »
I still thinks it's a 2D rocker, because over the course of a revolution, the center of the platform doesn't move in the Z axis...

If you put Sagan off-centre he'll be rocked in three dimensions.  :)
 

Offline bitwelder

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #10 on: March 06, 2013, 08:14:03 pm »
I did not quite get why the box has two switches, one marked "mains" and one marked "motor".
What else is the "mains" supplying power to apart of the motor?
 

Offline fuzzoli

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #11 on: March 06, 2013, 08:45:57 pm »
...slightly OT, but will you be planning a teardown and review of the PPS3205T-3S power supply?  Thanks - Frank
 

Offline SeanB

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #12 on: March 06, 2013, 09:03:33 pm »
I would guess the reason for 2 switches is because there is a version of this unit that has a heater mat built into the table to warm up the biological samples to a preset temerature, and this would mean there is a third switch for temperature on and off, along with a controller as well. Thus one switch for the unit to turn all off and then switches for the separate functions. Easy to feed the wiring for the heater mat and the temperature sensor up through the stabilising arm so they do not get subjected to excessive flexing and wear.
 

Offline NiHaoMike

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #13 on: March 06, 2013, 09:50:42 pm »
I would guess the reason for 2 switches is because there is a version of this unit that has a heater mat built into the table to warm up the biological samples to a preset temerature, and this would mean there is a third switch for temperature on and off, along with a controller as well. Thus one switch for the unit to turn all off and then switches for the separate functions. Easy to feed the wiring for the heater mat and the temperature sensor up through the stabilising arm so they do not get subjected to excessive flexing and wear.
Wouldn't it make more sense to have one switch on that version?
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Offline EEVblog

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #14 on: March 06, 2013, 09:56:27 pm »
...slightly OT, but will you be planning a teardown and review of the PPS3205T-3S power supply?  Thanks - Frank

Yes, of course.

Dave.
 

Offline T4P

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #15 on: March 07, 2013, 05:56:55 am »
The motor is AC induction, shaded pole or something typically used in stuff like fans. You can do crude speed control (or probably torque control) by triac phase angle switching to reduce the effective AC drive voltage.
I second that, no brushless motors have their windings on the outer core only induction motors like the ones found in fans
 

Offline Fezder

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #16 on: March 07, 2013, 03:13:10 pm »
Interesting, newer even heard this machine. And it even has purpose! :D
Overall, great video, entertaining but educating! :)
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Offline amyk

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #17 on: March 08, 2013, 06:44:21 am »
The negative voltage supply makes me think the chip might be fabbed in PMOS, like some early mains-powered alarm clock ICs.
 

Offline Mindlesscoolguy

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #18 on: March 14, 2013, 11:44:23 am »
I have never wanted to sit on something more than this in my (relatively short) life ;)
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Offline NiHaoMike

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Re: EEVblog #435 - 3D Rocker Teardown
« Reply #19 on: March 14, 2013, 05:49:23 pm »
The motor is AC induction, shaded pole or something typically used in stuff like fans. You can do crude speed control (or probably torque control) by triac phase angle switching to reduce the effective AC drive voltage.
I second that, no brushless motors have their windings on the outer core only induction motors like the ones found in fans
While most BLDC motors have the rotor on the outside, BLDC motors that have the rotor on the inside do exist.
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