Motor Selection

Notes:

  • Motor KV = revolutions/ volt (assuming no load attached to motor)

    • higher KV = lower torque, higher top speed (more spin spin)

    • lower KV = higher torque, lower top speed (motor can carry more weight i.e. can support larger propellers)

  • increasing current = increasing torque (affects load magnitude you can put on motor shaft)

  • increasing voltage = increasing speed

    • no load current = required current to turn motor without attached loads on the shaft

    • nominal current = required current for “normal use”

    • rated current = max current that can be used without damaging the motor

  • increasing voltage/current slightly past recommended limits will slowly wear out components (but doable, if only sustained for a short period of time). Increasing voltage/current a lot higher than recommended limits will kill your motor, plane, and your dreams of flight, very very quickly.

(Preliminary) Motor Choices:

  1. https://hobbyking.com/en_us/turnigy-aerodrive-sk3-3536-1050kv-brushless-outrunner-motor-1.html?queryID=519c9e285b3c2a1d780ba2b21819b811&objectID=47284&indexName=hbk_live_magento_en_us_products

  2. https://hobbyking.com/en_us/propdrive-v2-3548a-1100kv-brushless-outrunner-motor.html?queryID=519c9e285b3c2a1d780ba2b21819b811&objectID=58981&indexName=hbk_live_magento_en_us_products

  3. https://hobbyking.com/en_us/turnigy-aerodrive-sk3-3548-840kv-brushless-outrunner-motor-1.html?queryID=519c9e285b3c2a1d780ba2b21819b811&objectID=47290&indexName=hbk_live_magento_en_us_products

  4. https://hobbyking.com/en_us/turnigy-g90-325kv-brushless-outrunner-motor-90-glow.html?queryID=a0eed29fa4536e37cb6ea858e45c9dbf&objectID=86083&indexName=hbk_live_magento_en_us_products

 

Motor #

Price ($CAD)

KV

[RPM/V]

Max Power [W]

Max Current [A]

Max Voltage [V]

Weight [g]

Calculated Motor Speed [RPM]*

Motor #

Price ($CAD)

KV

[RPM/V]

Max Power [W]

Max Current [A]

Max Voltage [V]

Weight [g]

Calculated Motor Speed [RPM]*

1

52.06

1050

443

40

16

105

4200

2

44.44

1100

640

70

14.8

185

4070

3

68.57

840

656

50

16

167

3360

4

88.89

325

1150

52

22.2

600 (lol no)

1803

*Assuming using 25% Max Voltage. Motor Speed [RPM] = KV(0.25)(Max Voltage)

 

 

Sources:

  1. https://www.flitetest.com/articles/how-to-choose-the-perfect-brushless-motor