This method works for most controllers. All you need a resistor (variable resistors are preferred) and optionally a single pole double throw switch (SPDT).
You should get the variable resistor with value of 500 ohm (max).
Make sure your motor controller power supply for motor hall is 5V or this trick might not work. Cut the motor hall power wires and attach variable resistors in series on it.
Set variable resistor to 0 ohm first, then turn on ignition switch.
Turn the thrust to maximum and hold it there. Now your motor should be steady at its maximum speed.
Slowly turn variable resistors up, you should observe motor speed increases. Through adjust resistor you should be able to increase max speed by 30% but I usually stay less than 10%. (I won't go into detail but if you wondering why this effect please Google "flux wakening control") Note that too high resistance value will worsen hall signal too much and result excessive heating and ultimately, the destroy of controller. So don't be greedy.
After you've done previous step you may find out your motor have hard time to start or starting is cranky, this is because flux was wakened too much and to the point cannot provide enough coercivity to sustain smooth rotor movement. To solve this you need to detach resistors while say motor speed is less than 70% or torque required is less than 1/3. You can use the optional single pole double throw switch to attach / detach resistor from hall power wire on the fly when maximum torque is desired.
Word of warning, this method is just an ugly and cheap way to increase motor maximum speed. Ideally the whole procedure should be done automatically by a capable controller. Nevertheless, the extra speed doesn't come from nowhere. Increased current requirement sometime as much as 2 times the previous maximum might be observed and that is the price of little extra speed. (you need to crank up soft current limit in controller too) Think as afterburner, unless you got an F-22 or you can't leave the afterburner burning all the time or the whole thing might blow up.
You should get the variable resistor with value of 500 ohm (max).
Make sure your motor controller power supply for motor hall is 5V or this trick might not work. Cut the motor hall power wires and attach variable resistors in series on it.
Set variable resistor to 0 ohm first, then turn on ignition switch.
Turn the thrust to maximum and hold it there. Now your motor should be steady at its maximum speed.
Slowly turn variable resistors up, you should observe motor speed increases. Through adjust resistor you should be able to increase max speed by 30% but I usually stay less than 10%. (I won't go into detail but if you wondering why this effect please Google "flux wakening control") Note that too high resistance value will worsen hall signal too much and result excessive heating and ultimately, the destroy of controller. So don't be greedy.
After you've done previous step you may find out your motor have hard time to start or starting is cranky, this is because flux was wakened too much and to the point cannot provide enough coercivity to sustain smooth rotor movement. To solve this you need to detach resistors while say motor speed is less than 70% or torque required is less than 1/3. You can use the optional single pole double throw switch to attach / detach resistor from hall power wire on the fly when maximum torque is desired.
Word of warning, this method is just an ugly and cheap way to increase motor maximum speed. Ideally the whole procedure should be done automatically by a capable controller. Nevertheless, the extra speed doesn't come from nowhere. Increased current requirement sometime as much as 2 times the previous maximum might be observed and that is the price of little extra speed. (you need to crank up soft current limit in controller too) Think as afterburner, unless you got an F-22 or you can't leave the afterburner burning all the time or the whole thing might blow up.
