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HomeAircraftHelicopterHelicopter Main Discussion › motow PWM frequency question
03-11-2015 02:08 PM  3 years agoPost 1
emederos

rrApprentice

Miami, Fl Dade

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I have programmabke on my hobbywing programmer 8,16,24 and 32 mhz motor timing, what is the general rule of thumb for efficiency ? I have a 12t pinion and align 1600kv motor?

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03-11-2015 02:25 PM  3 years agoPost 2
Pistol Pete

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Seffner, FL

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PWM Formula
3.7V per cell X motor Kv X motor Pole Count / 20

~~Enjoying the hobby one flight at a time~~

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03-11-2015 03:33 PM  3 years agoPost 3
emederos

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Miami, Fl Dade

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6s pack 22.2 x 1600kv x 6 poles / 20?? Still dont understand how to know to determine frequency?

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03-11-2015 04:33 PM  3 years agoPost 4
Pistol Pete

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Seffner, FL

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PWM Khz

22.2V X 1600Kv X 6 poles / 20 = 10,656

Closest option you have to 10K is 8K

Select 8.

As for Motor Timing:
LOW = more efficient, less power, lower temp
MED = middle of both and usually the default used.
HIGH= less efficient, more power, higher temp

Your ESC may use numbers instead but same principle applies.

~~Enjoying the hobby one flight at a time~~

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03-13-2015 08:43 PM  3 years agoPost 5
emederos

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Miami, Fl Dade

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Thanks my hobbywing options are 8,16,24 and 32 . Currently its on 16 and with 12t pinion at 85% throttle esc is warm, motor isnt hot to the touch but after about 5 sec it is. I can go down to 8mhz see how it feels. Is that what you recommend?

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03-14-2015 01:34 PM  3 years agoPost 6
Pistol Pete

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Seffner, FL

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Yes. 8 is what I would use.

Lets us know how it went after the change.

~~Enjoying the hobby one flight at a time~~

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03-14-2015 01:37 PM  3 years agoPost 7
emederos

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Miami, Fl Dade

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8 is the lowest setting would that put out the lowest power ?

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03-14-2015 01:52 PM  3 years agoPost 8
Pistol Pete

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Seffner, FL

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No, nothing to do with power as PWM is a switch.

By changing it to 8, your motor should run cooler. Try it.

~~Enjoying the hobby one flight at a time~~

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03-15-2015 12:25 AM  3 years agoPost 9
emederos

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Miami, Fl Dade

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so i tried it and the heli felt with less power just by hearing it on spool up it already sounded like it had less power not only that the heli had a vibration that it didnt have. i put it back on 16mhz and it seems normal again. my esc also has timing setting besides the PWN setting how can that affect temps and where should it be? right now its at 15 timing???

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03-16-2015 03:38 PM  3 years agoPost 10
Pistol Pete

rrProfessor

Seffner, FL

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If it works better for you on 16, then keep it there.

Your ears are your best tool.

PWM numbers. Higher number, more efficient.

MOTOR Timing of 15.
IF its the middle of the available range (ie: 0 to 30), then 15 would be equal to MED, for those ESC that uses words instead (Lo-Med-Hi).

~~Enjoying the hobby one flight at a time~~

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03-16-2015 04:32 PM  3 years agoPost 11
blackkat98

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Shreveport, La USA

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Hey Pete...

Tagging on here...

I too have a Hobbywing ESC.

My calculations: 22.2V x 1880kV x 10 poles / 20 = 20,868

Would you use 16 PWM or 24 PWM?

Thanks.

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03-16-2015 05:09 PM  3 years agoPost 12
Pistol Pete

rrProfessor

Seffner, FL

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24 and monitor ESC temp. If too hot step down to 16. Some type of temp measuring tool is nice to have when dealing with electrics.

~~Enjoying the hobby one flight at a time~~

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03-16-2015 05:41 PM  3 years agoPost 13
blackkat98

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Shreveport, La USA

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Thanks! I have a Duratrax infrared temp sensor. How hot is too hot?

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