Zimula
CR2032 Battery
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« on: September 09, 2010, 05:58:34 PM » |
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help po..
sadya po bang nainit po ng sobra ung L298? kasi po nung ginamit namin un as motor driver, nainit po siya.. ang duty cycle po ay 50% tpos 1khz ang frequency.. post ko po sana ung picture kung panu namin ginamit kaso di ko lam kung panu maglagay ng picture d2.. help naman po.. please.. thank you po..
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The Philippine Electronics and Technology Forum
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« on: September 09, 2010, 05:58:34 PM » |
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DigitalMind
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Hydroelectric
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« Reply #1 on: September 09, 2010, 07:44:18 PM » |
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^
hello. points to ask yourself bro...
1. nag lagay ka ba nang heatsink?
2. nag measure ka ba muna nang motor current and behavior nya using your multimeter? (stall current, running, peak current)
3. after mo mamesure yung actuall current (kung may datasheet mas ok) swak ba sa h-bridge mo?
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Zimula
CR2032 Battery
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« Reply #2 on: September 10, 2010, 10:08:28 AM » |
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^
hello. points to ask yourself bro...
1. nag lagay ka ba nang heatsink?
2. nag measure ka ba muna nang motor current and behavior nya using your multimeter? (stall current, running, peak current)
3. after mo mamesure yung actuall current (kung may datasheet mas ok) swak ba sa h-bridge mo?
wala po kami heat sink.. di na po namin nameasure ksi nung hinawakan namin ung l298, eh sobrang init.. |
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rdpzycho
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Solar Power Satellite
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« Reply #3 on: September 10, 2010, 10:19:23 AM » |
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^ ano rated current nung motor? ano on voltage ng switches ng L298? at gaanong kainit ang sobrang init?
drivers will typically heat dahil mataas na current ang dinadala nila. minsan lalo silang umiinit dahil walang freewheeling diode, napwe-pwersa sila kapag nagte-turn off.
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"Keep on starting, and finishing will take care of itself."
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Zimula
CR2032 Battery
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« Reply #4 on: September 10, 2010, 10:37:09 AM » |
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Do you have any suggestion/alternative for driving motor? Pede po ba ang MOSFET? ano po kayang klase ng Mosfet?
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Zimula
CR2032 Battery
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« Reply #5 on: September 10, 2010, 10:38:37 AM » |
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^ ano rated current nung motor? ano on voltage ng switches ng L298? at gaanong kainit ang sobrang init?
drivers will typically heat dahil mataas na current ang dinadala nila. minsan lalo silang umiinit dahil walang freewheeling diode, napwe-pwersa sila kapag nagte-turn off.
sir.. meron naman po kaming nailagay na freewheeling diode.. Un pong "sobrang init" eh kayang tumunaw ng breadboard.. |
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rdpzycho
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« Reply #6 on: September 10, 2010, 10:42:02 AM » |
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^ mahirap mag-drive ng MOSFET's. merong schematic dito sa site BJT ang gamit. pero ganun din 'yun, iinit din siya. ano nilagay niyo ng free wheeling diode? nasira ba 'yung driver? 'yung breadbord 'di talaga 'yan designed para sa components na naghi-heat up.
nasa 1V ang saturation voltage ng L298, so kung halimbawang 1A ang dadaan, 2W ang consumption ng buong leg. with that package, malamang 2W lang ang kaya without heatsink.
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"Keep on starting, and finishing will take care of itself."
- Neil Fiore
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Zimula
CR2032 Battery
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« Reply #7 on: September 10, 2010, 10:48:13 AM » |
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^ mahirap mag-drive ng MOSFET's. merong schematic dito sa site BJT ang gamit. pero ganun din 'yun, iinit din siya. ano nilagay niyo ng free wheeling diode? nasira ba 'yung driver? 'yung breadbord 'di talaga 'yan designed para sa components na naghi-heat up.
nasa 1V ang saturation voltage ng L298, so kung halimbawang 1A ang dadaan, 2W ang consumption ng buong leg. with that package, malamang 2W lang ang kaya without heatsink.
may isuggest po ba kau na alternative IC? |
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rdpzycho
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« Reply #8 on: September 10, 2010, 11:00:37 AM » |
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^ why use an alternative IC? halos pare-parehas ang Vsat ng mga 'yan kung packaged sa IC 'yung switch, kailangan talaga i-manage 'yung thermal problem.
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"Keep on starting, and finishing will take care of itself."
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tiktak
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« Reply #9 on: September 10, 2010, 11:30:09 AM » |
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or baka naman may short somewhere sa circuit nyo, happened to me one time  |
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Bakit andaming hindi marunong gumamit ng search?  |
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Anak ng
Size AA Battery
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Pating!!!
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« Reply #10 on: September 10, 2010, 12:40:59 PM » |
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^yeah! tama si sis rpd at sis tiktak....
tingnan mo muna yung circuit nyo kung may short...
then i-try nyong lagyan ng heatsink ang L298 nyo...
or sis martin says...better compute your motor current saka yung current kapag may load na ang motor nyo..isang bagay na talagang nkakaaffect sa motor drivers is the motor current kapag may load siya...
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The Philippine Electronics and Technology Forum
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January 17, 2010, 08:52:27 PM
