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Motors Sizing


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Motor Sizing

The Size of brushless motors is indicated by a 4-digit number – AABB. “AA” is the stator width, while “BB” is the stator height or stator diameter, both in mm (millimetre).

Example,

XING 2208 1800KV Brushless Motor 6S for QAV FPV Racing Drone Quadcopter 

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 Has a stator with a diameter of about 22mm and with a height of about 08mm.

                                              Taller stator = more power at higher RPM 
                                              Wide stator the more torque at lower RPM

The KV value of a motor indicates the speed with which the motor would rotate when you apply one volt across its windings. It is determined by the number of copper wire winding in the motor stator, and the magnetic strength of the magnets. But generally, the higher number of winds decreases the KV of the motor, while the lower number of winds increases the KV of the motor.

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Fewer the winding means less resistance, meaning more current can get through, and get higher RPM. That’s why higher KV motors generally have fewer windings in the stator.

The KV determines what propeller you can use with a motor.

"lower the KV the larger Prop"

The lower the KV the larger the prop that it can spin and the vice versa.

Reasoning:  You cant  generate more lift by putting a larger propeller on the higher KV motor because the torque requirements will push the motor beyond its rated power limits and overheat.

 

Note -The KV is by no means an indicator of the power output of the motor, higher KV motors are not necessarily more powerful than lower KV motors.

Power is determined by the wattage of the motor, or the amount of amps (A) it can withstand at a particular voltage (V).

Power = Voltage X Current

500W = 12V X 42A

500W = 20V X 25A

Example:

BR2205 2600kv motors can run 5x4 inch props

BR2212 1000kv motors can run 10x4.5 inch props

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This is the specifications for the first motor selection for drone ser 1

The specs breakdown will be analized to determine the prop and performance of the motors with 6s battery

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Hobbywing XRotor 40A ESC 2-6S Wire Leaded for 550 650 Quadcopter Drone

The decision was made to select an inexpensive ESC that would work right out of the box. (hopefully) 
The objective is to try different motor and prop configurations for the Printed commercial drone build ser  #1 and to build some data 

The many factors in the spec sheets will be analyzed and performance recorded so we can get the most efficient operation for the different configurations we will be working with.   

Not alot of fluff here but hoping for reliability and longevity   (12 bucks each, what would you expect)

  • Brand: Hobbywing
  • Model: XRotor 40A(Asian Version A)
  • Continous current: 40A
  • Burst current: 60A
  • BEC: NO
  • Power supply: 2-6S LiPo battery
  • ​Output Connectors: 3.5 Gold Connector(Female)
  • Suit for: 550 650 RC drone quadcopter
  • Quantity: 1
  • Size: 65 * 25 * 7mm/pcs
  • Weight: 44g/pcs
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