Timeline for Eliminate PWM noise in PWM-driven bidirectional motor
Current License: CC BY-SA 3.0
18 events
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| Apr 13, 2017 at 12:32 | history | edited | CommunityBot |
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| Dec 13, 2014 at 16:12 | comment | added | darron | @SF: This seems to suggest otherwise: electronics.stackexchange.com/questions/21928/… | |
| Dec 13, 2014 at 15:56 | comment | added | SF. | @darron: Unfortunately, the only way it will only be bipolar is that you'll be able to damage it by applying voltage in either direction. Been there, thought about diodes, that only put me in the trap of "you can charge it, but never discharge". | |
| Dec 13, 2014 at 6:17 | answer | added | Bruce Abbott | timeline score: 1 | |
| Dec 13, 2014 at 3:22 | comment | added | darron | Can't you make a bipolar electrolytic by putting two unipolar ones in series in opposition? Perhaps someone knows if it's safe enough... I don't. :) I've just seen it suggested before. | |
| Oct 14, 2014 at 3:00 | comment | added | Chris Stratton | And more featureful chips are more likely to have a PLL boosted clock giving greater timing resolution anyway. | |
| Sep 13, 2014 at 20:48 | answer | added | Whistle1560 | timeline score: 0 | |
| Sep 2, 2014 at 16:54 | comment | added | Olin Lathrop | All that stuff you mention doesn't have to come from a single micro. If you have that many things going on, then offloading the cycle by cycle motor control to a micro optimized for that is probably a good overall architecture. The main micro that runs the GUI sends high level commands to the motor controller, like "go to position xxxx" and the like. | |
| Sep 2, 2014 at 16:00 | comment | added | SF. | @Dzarda: This may be the way. This hardware provides spread spectrum option (+-5% by default). To be honest I have no clue what is the effect of enabling it... | |
| Sep 2, 2014 at 15:47 | comment | added | Dzarda | @SF. You can always put in some spread spectrum to that frequency, just by slightly adjusting the period. This would greatly limit the level of annoyance. Some chips have that in hardware. | |
| Sep 2, 2014 at 15:40 | comment | added | SF. | ...good news is I can still get 7-bit resolution at 23kHz, meaning I'll be only annoying the youngest customers ;) | |
| Sep 2, 2014 at 15:32 | comment | added | SF. | @OlinLathrop: Add to that two quadrature decoders, ADC, touchscreen support,built-in RS-232 to USB converter and all at reasonable price, and the number rapidly drops. | |
| Sep 2, 2014 at 15:28 | comment | added | SF. | @Dzarda: The 4.7uF ceramic won't do much good with a fried 1000uF electrolytic in parallel... | |
| Sep 2, 2014 at 12:45 | comment | added | Olin Lathrop | If your controller can't generate high enough frequency to not cause whine, get or make one that can. Plenty of microcontrollers come with built-in PWM that still has lots of resolution at 24 kHz. Think of this as having used the wrong part in your first version of the circuit and fix it. | |
| Sep 2, 2014 at 11:21 | comment | added | Dave Tweed | @Dzarda: Not the ceramic one, the electrolytic one. | |
| Sep 2, 2014 at 11:19 | history | tweeted | twitter.com/#!/StackElectronix/status/506763359543644160 | ||
| Sep 2, 2014 at 11:13 | comment | added | Dzarda | Please excuse, but why will the cap be fried? EDIT: That is, a ceramic one. | |
| Sep 2, 2014 at 10:40 | history | asked | SF. | CC BY-SA 3.0 |