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Author Topic: Servo Voltage Stabiliser--Project  (Read 5173 times)
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Malcolm
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« on: December 09, 2008, 05:42:44 17:42 »

Servo controlled Voltage Stabiliser--Project

Here a motor shaft is coupled with an adjustable  tongue of a Variac.
When the AC mains voltage is high ,the motor turns in anti-clockwise direction
to decrease the output voltage.
When the AC mains voltage is low,the motor turns in clock-wise direction to increase the output voltage.

Has anybody experimented with this type of stabiliser?
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fernandodiaz
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« Reply #1 on: December 09, 2008, 06:12:45 18:12 »

HI IF YOU NEED CONTROL AC SPEED MOTOR CAN USE TRIACs SWITCHING GATE MODIFY ANGLE SHOT START, THIS METOD YOU CAN REGULATED VOLTAGES
http://www.ece.uwaterloo.ca/~knigim/NAPS2001-nigim-copy.pdf


OTHER WAY IS USE POWER SWITCHING IGBT OR  POWER MOSFET PWM CONTROL H BRIDGE SINE WAVE ALGORITM
http://www.powerdesigners.com/InfoWeb/design_center/articles/PWM/pwm.shtm

IF YOU USE SERVO CONTROL TRANSFORMER  IS SOME OLD SYSTEM AND NO SURE LIFE TIME
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Walkura
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« Reply #2 on: December 09, 2008, 08:06:31 20:06 »

I do know the method but do realise the feedback is very slow .
This will only work when its no problem take several periods response time .
Also you could consider a transformer with multiple input voltages .
You select the proper input winding by measuring the output voltage followed by triggering the triac of  choice .
More modern systems use creative pfc like setups followed by bridge tied load or by injecting the buck voltage into a autotransformer .

Good luck and be carefull Smiley
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xdsoft42
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« Reply #3 on: December 09, 2008, 09:23:24 21:23 »

see
http://www.national.com/pf/LM/LM629.html
dc servo motor pid control
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9thwonder
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« Reply #4 on: December 11, 2008, 02:14:08 14:14 »

I have allready developed this type of project using 16f72 with all displays and adjusting buttons.
what you want to know let me know.
thanks
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Malcolm
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« Reply #5 on: December 12, 2008, 07:19:12 07:19 »

I have allready developed this type of project using 16f72 with all displays and adjusting buttons.
what you want to know let me know.
thanks

Hello 9thwonder,
I am much interested abouit your project.

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sohel
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« Reply #6 on: December 12, 2008, 07:56:34 07:56 »

Servo Voltage Stabiliser is not old topology? Huh

main terget is constant output, so what do u think about smps with pwm.
if i am going to wrong please point out why not.


Servo Voltage Stabiliser make with some opamp with feedback.

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Parmin
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« Reply #7 on: December 13, 2008, 05:12:32 05:12 »

Use the same system as auto rotating solar cell, or line following robot.

get two readings,  one on the high end and the other on the low end of the output.

feed the reading to a comparator to generate high or low pulse
 to rotate the shaft.

Remember you need a hysteresis so the motor will stop during tolerance reading
otherwise your motor will always rotate and heats up.
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9thwonder
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« Reply #8 on: December 27, 2008, 08:57:55 08:57 »

Dear Malcolam,
I have Done it with 16f72. Included with 24c04 to store the output volt setting over load setting hi cut lo cut etc. Port c is used for seven segment display, Rb.7 an Rb.6 is used for rotating motor up an dn.
Simply i am going to setting mode and after setting all parameters like output volt hicut auto mannual etc i am coming to the main routine. where after measuring output volt i am rotating motor right or left with the help of triac which is driven by moc 3021.
the display is showing input, output, current timer etc. Which is done in the interrupt routine.
ANY PARICULAR QUESTION IF YOU WANT TO ASK YOU ARE MOST WELCOME.
THANKS

Posted on: December 27, 2008, 08:52:24 08:52 - Automerged

Dear Shoel,
Smps with pwm is used for power supply generally DC. Where as Servo voltage stabiliser is used for stabilisation of mains input voltage with 1% regulation.
The another technology has come where Variacs are not used in servo stabilisers bucking and boosting is done by switching Igbt or mosfets to the primary of buck boost transformer.
I am working on it day night. But still in Development stage
thanks 
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looser
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« Reply #9 on: December 27, 2008, 12:20:12 12:20 »

Hi Malcom,

There is one  servo voltage stabiliser like you described in the factory I am working and had the chance to see inside. It was an absolute simple design. I do not know if I can have another chance to take pictures and let you know but at least I can describe now.

A kilowatt of a toroidal transformer used as otto connection. The free end was tapped onto the toroid by a carbon wheel and rotate from the first winding to  the last to get you obtain about  0 to 245V. And the driving mechanism was just an ordinary car window wiper motor. This motor has an existing gear system to reduce the speed and simply driven by 12V. To change the direction of motor ( which will let you to increase or decrease the voltage at the output ends) change the polarity of the applied voltage.  Again a very simple window comparator was doing the drive duty of motor. Thats it.

The drawback is the reaction time and is too much. It can not follow the voltage fluctuations rapidly. Takes about two second to set to the new position.

Please let me know if interested more.

regards.
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Malcolm
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« Reply #10 on: December 27, 2008, 06:03:46 18:03 »


Please let me know if interested more.

Hello Looser,
Yes,Yes,  I like to know more.

Do you have any  commercial Servo stabilisers Service Manuals-eg,-
-NELCO,SEN & PANDIT,OPTO,Quatron,EC,etc,  or any other circuit diagrams for your reference?

Regards.
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looser
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« Reply #11 on: December 30, 2008, 11:26:15 11:26 »

hi malcolm

Posted on: December 30, 2008, 11:24:22 11:24 - Automerged

a few more
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Malcolm
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« Reply #12 on: December 30, 2008, 12:58:17 12:58 »

Hello Looser,

Dont you have the circuit diagrams for this?

Thanks.
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zawmintun1
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« Reply #13 on: January 02, 2009, 04:04:52 16:04 »

I think this design is good but Auto Transfomer Tapping Change with Triacs Design is better
So all friends ?
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« Reply #14 on: January 04, 2009, 07:59:34 07:59 »

looser , please post the circuit diagram if u have.......
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tAhm1D
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« Reply #15 on: January 04, 2009, 09:45:10 09:45 »

Dear Shoel,
Smps with pwm is used for power supply generally DC. Where as Servo voltage stabiliser is used for stabilisation of mains input voltage with 1% regulation.
The another technology has come where Variacs are not used in servo stabilisers bucking and boosting is done by switching Igbt or mosfets to the primary of buck boost transformer.
I am working on it day night. But still in Development stage
thanks 

Hi 9thwonder,
Yes, you can try with Buck-Boost Topology, but remember that peak current in this Topology is 5.5 Times of the nominal current. Keep that in mind. I am interested in this type of product as it is based on smps. Please let us apprised regarding your progress if possible.

For looser,

It looks like conventional Auto transformer based one. Please enumerate more regarding it, if not schematic. It is interesting.
« Last Edit: January 04, 2009, 06:17:18 18:17 by tAhm1D » Logged
looser
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« Reply #16 on: January 05, 2009, 09:07:15 09:07 »

Hi guys

I draw one circuit to be used  for the voltage stabiliser above. Hope will meet your needs.

Regards.
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