Single-Rotor Vs Multi-Rotor


What's the difference between the single-rotor motor series and the multi-rotor motor Series?

KDE Direct offers two different types of motors (single-rotor motors which are shaft drive and multi-rotor motors which are direct drive). 

Can I use single-rotor motors for fixed wing applications?

The single rotor motor series was originally designed with the intention of using gear boxes to reduce the nominal 16,000-24,000 RPM speed to a lower head speed of 3,000-4,000 RPM on RC helicopters and other geared applications. KDE Direct doesn't sell an adapter for mounting propellers to the single-rotor motor shaft. A yoke and collet style propeller adapter would be required for fixed wing applications. However, directly attaching propellers to the single-rotor motors shaft will reduce the efficiency since drag increases with the higher RPM. By gearing the motor, it reduces speed and increases the torque. Please see our gearing recommendations for the single-rotor motors we sell. 

What advance timing is optimal with the single rotor motors?

The single rotor motors we sell can be used with the 125UVC ESC with the 12 degree timing beta firmware (D460385.dfu). Make sure to use the default motor edition. The advance timing is hard coded in this firmware version so changing the PC setting will not make a difference.

What is advance timing (lead angle adjustment)?

The advance timing adjusts the commutation interval so that excitation of the motor windings happens earlier. In BLDC motors, the phase current of the motor lags behind the phase voltage because of the inductance of the motor. The purpose of advance timing is to align the phase current with the Back-EMF. The single-rotor motor series works best with an advance timing of 5° - 15°. The multi-rotor motor series works best with an advance timing of 22° - 30°

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