KONDOR XL 20-37 motor max cell count
#2
Join Date: Sep 2002
Location: Nijmegen / Nederland
Posts: 634
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Motors, unlike ESCs!, can handle any voltage in RC land, as long as current & power drawn and rpm don't get too high.
The wire insulation/laquer/resin can withstand several hundred volt.
So the max.voltage depends on the prop: the higher the prop load and/or on Kv (→higher current), the lower the max. operating voltage (→lower current).
Therefore: what prop would you want to use, what velocity konstant Kv? With those numbers you can calculate rpm, current and power drawn.
Using e.g.
www.ecalc.ch
or
www.rcgroups.com/forums/showthread.php?736782-Scorpion-Calculator
Voltage/prop combination tables are merely suggestions.
To keep current and power drawn in bounds, the highest voltages should go with the low-load prop, the high-load props go with the low voltage.
All this because current drawn goes up with pitch, voltage² Kv³ and diameter⁴
Although velocity_konstant_Kv has a massively disprportional effect on current (squared) and power (cubed) drawn, Kv, measured/expressed in rpm/volt, says nothing about a motor's max. current and max.power ratings.
Both the motor in your electric toothbrush and the motor in a 1:1 train can have th same Kv.
*****
A very long clearance sale, originally 200+$, versatile, high quality, now literally peanuts:
Hyperion Emeter II wattmeter with local&remote logging, optical&electrical rpm meters, servo tester - RCG
Without a watt/volt/current/multi-meter you are in the dark.
Until something starts to glow
The wire insulation/laquer/resin can withstand several hundred volt.
So the max.voltage depends on the prop: the higher the prop load and/or on Kv (→higher current), the lower the max. operating voltage (→lower current).
Therefore: what prop would you want to use, what velocity konstant Kv? With those numbers you can calculate rpm, current and power drawn.
Using e.g.
www.ecalc.ch
or
www.rcgroups.com/forums/showthread.php?736782-Scorpion-Calculator
Voltage/prop combination tables are merely suggestions.
To keep current and power drawn in bounds, the highest voltages should go with the low-load prop, the high-load props go with the low voltage.
All this because current drawn goes up with pitch, voltage² Kv³ and diameter⁴
Although velocity_konstant_Kv has a massively disprportional effect on current (squared) and power (cubed) drawn, Kv, measured/expressed in rpm/volt, says nothing about a motor's max. current and max.power ratings.
Both the motor in your electric toothbrush and the motor in a 1:1 train can have th same Kv.
*****
A very long clearance sale, originally 200+$, versatile, high quality, now literally peanuts:
Hyperion Emeter II wattmeter with local&remote logging, optical&electrical rpm meters, servo tester - RCG
Without a watt/volt/current/multi-meter you are in the dark.
Until something starts to glow
- To trust is good
- To calculate is better
Will get you to say within 10%, if input ok.
e-flight calculators & propdata (compilation)- To measure is a must
A watt-meter will more than pay for itself, several times over, your battery, ESC and motor will love you for it.
After calculating, always check/measure current when you have a new/changed setup.
Will also help you find optimal setup.
And it's a great tool for debugging your power train.- About watt-meters and how (not) to use them, by RCG user vollrathd:
www.wattflyer.com/forums/attachment.php?attachmentid=117297- A very long clearance sale, originally 200+$, versatile, high quality, now literally peanuts:
Hyperion Emeter II wattmeter with local&remote logging, optical&electrical rpm meters, servo tester - RCG
Contents- Closing out at
- Reviews by Bernard Cawley and Ken Myers
- Tech info & help threads
- Increasing max.current, double, triple, simple and cheap
- Software and manuals downloads
- Increasing max.current, double, triple, simple and cheap
- Tech info & help threads
- Reviews by Bernard Cawley and Ken Myers
- Careful!
(Always!) keep battery-/watt-/multi-meter wires short:
Too long wires batteryside can kill ESC over time: precautions, solutions & workarounds - RCG
- Closing out at
- A very long clearance sale, originally 200+$, versatile, high quality, now literally peanuts:
- About watt-meters and how (not) to use them, by RCG user vollrathd:
- To measure is a must
- To calculate is better
Last edited by ron_van_sommeren; 06-30-2023 at 11:07 AM.
#3
Join Date: Sep 2002
Location: Nijmegen / Nederland
Posts: 634
Likes: 0
Received 22 Likes
on
17 Posts
So the max.voltage depends on the prop: the higher the prop load and/or on Kv (→higher current), the lower the max. operating voltage (→lower current).
Therefore: what prop would you want to use, what velocity konstant Kv? With those numbers you can calculate rpm, current and power drawn.
Using e.g.
www.ecalc.ch
or
www.rcgroups.com/forums/showthread.php?736782-Scorpion-Calculator
Prettig weekend Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
• E-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC •
Therefore: what prop would you want to use, what velocity konstant Kv? With those numbers you can calculate rpm, current and power drawn.
Using e.g.
www.ecalc.ch
or
www.rcgroups.com/forums/showthread.php?736782-Scorpion-Calculator
Prettig weekend Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
• E-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC •
Last edited by ron_van_sommeren; 06-30-2023 at 11:05 AM.