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adnan_merter
Joined: 23 Jan 2008
Posts: 9
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 22 Feb 2008 15:26 stepper motor driver circuit with optocouplers |
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i have a unipolar 2 phase step motor and i have a circuit diagram which designed
with uln 2003. but i need to redesign this circuit by using optocoupler. how can i
do this?
please help
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Kinjalti25
Joined: 24 Feb 2008
Posts: 6
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| 24 Feb 2008 13:53 Re: stepper motor driver circuit with optocouplers |
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Hi,I am also working with stepper motor(Bi polar) interfacing with dsPIC30f2010.
To use optocoupler, first connect the output of MCU/logic CKT to optocoupler (MCT2E)through inverter and then the collector of opto coupler to input of ULN2003.
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abdallayad
Joined: 04 Jun 2008
Posts: 5
Helped: 2
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| 04 Jun 2008 18:10 Re: stepper motor driver circuit with optocouplers |
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this is for you
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causs
Joined: 10 Jun 2004
Posts: 2
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| 05 Jun 2008 8:32 Re: stepper motor driver circuit with optocouplers |
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| you can see the PS2801's Datasheet, maybe it will have some help for you
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adnan_merter
Joined: 23 Jan 2008
Posts: 9
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| 05 Jun 2008 9:55 stepper motor driver circuit with optocouplers |
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Thank you all guys,
i achieved to drive my step motor by using darlinghton transistors and i also was able to use optocouplers, but now i have a new problem;
my motor cant run high speed although i give it to 1KHz signals.
if frequency is very high,it doesnt run,just vibrate.
but i know it can reach very high rpm.
how can i make it speedy?
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FvM
Joined: 22 Jan 2008
Posts: 2688
Helped: 439
Location: Bochum, Germany
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| 05 Jun 2008 18:54 Re: stepper motor driver circuit with optocouplers |
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| Quote: |
if frequency is very high,it doesnt run,just vibrate.
but i know it can reach very high rpm. |
If you know this from the data sheet, are your operating conditions according to the datasheet? High step frequencies are generally requiring high voltages at the motor. Mainly bipolar drive, constant current circuits are used in this connection. Simple constant voltage unipolar circuits are rarely usable for above 1 kHz step rate.
Additionally acceleration/deceleration ramps may be necessary with higher step rates (above the start-stop frequency).
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