RPM – Setup

      Comments Off on RPM – Setup




  • RPM (Revolutions Per Minute)

Motor Details

  • Determine the number of magnetic poles (blades in OpenTX)
    • Emax MT1806-2280KV
    • Framework 12N14P
    • 14P = 14 Magnets = 7 Pole Pairs = 7 blades in OpenTX
  • Note the KV 2280 revolutions per minute per volt


  1. Connection diagram
  2. Turn On Tx
  3. Power up Rx with sensor connected
    Motor connected with propeller removed
    Throttle at minimum
  4. Observe the LED that flashes on the sensor
    Only LED 0 should flash, if not see “Sensor Pole Pair Setting” below
  5. Press MENU
  6. Long press PAGE
  7. Scroll down to “Discover new sensors”, press ENT
  8. New sensors will be discovered, with “Stop discovery” selected press ENT
  9. Scroll up and select the “RPM” sensor
  10. Long press ENT
  11. Select “Edit”, press ENT
  12. Scroll down and select “Blades”
  13. Select the number 7
    7 magnet pairs = 14 magnets = 14P
  14. Press ENT
  15. Press EXIT
  16. Press EXIT


  1. With propeller removed increase the throttle
    Observe RPM values change
  2. Increase throttle to maximum
    Note the RPM 24458rpm
  3. Note the battery voltage A2 11.3V
    If A2 is not present use a voltmeter attached to the battery
  4. Multiply the KV with battery voltage
    2280 x 11.3 = 25,764 rpm (theoretical)
  5. The theoretical RPM 25,764 should be close to the sensor RPM 24,458
    In this example there is a 5% difference
  6. Use a tachometer to verify the measured RPM
    DANIU DT2234C+

Sensor Pole Pair Setting

  1. Power on the sensor
    Observe the number of the LED that flashes
    LED 0 should be the only one that flashes

    If a different LED flashes, or more than one LED flashes set the sensor by pressing the Key button
    Example of incorrect LED flashing
  2. Press the Key button till an LED turns on

  3. Repeatedly press the Key button till only LED 0 is lit
  4. When only LED 0 is lit turn the sensor off and then on
    Only LED 0 will be lit