Sensorless high-speed FOC solution for uav ESC

The ESC module is a very important subsystem in non-military uav. Users need more efficient models to achieve longer flight time, better dynamic behavior and smoother and stable performance.This design USES electronic speed regulators (ESC) commonly used for unmanned aerial vehicles (uavs) or uavs.

Speed control was achieved in a sensorless manner, using FOC speed control to test the motor at up to 1.2kHz electrical frequency (12kRPM, 6-pole to motor).Our uav ESC high speed sensorless FOC reference design has first-class FOC algorithm implementation, which can achieve longer flight time, better dynamic performance and higher integration, so the circuit board size is smaller and BOM components are fewer.Sensorless speed FOC control using TI FAST ™ software observer, using the InstaSPIN - Motion ™ C2000 ™ LaunchPad and DRV8305 BoosterPack.

Range of application

Drones and uavs

High speed motor

Battery-powered power tools

features

InstaSPIN - FOC ™ sensorless FOC can achieve the highest dynamic performance;

Three lithium polymer batteries were tested at speeds up to 12,000 RPM.

High dynamic performance: the rotation speed was increased from 1kRPM to 10kRPM (electrical frequency from 100Hz to 1kHz) in less than 0.2s, so as to achieve high performance deflection and pitching action.

The quick flip ability suitable for completing the flip action;

The FOC efficiency can be improved by blocking reversing, so longer flight time can be achieved.

Higher PWM switching frequency (up to 60kHz) can reduce current/torque ripple for low inductance and high speed motor, and can avoid interference with ultrasonic sensor;

Flexible power stage supports two to six lithium polymer batteries;

Due to instaspin-foc's automatic motor parameter identification: automatically tuning sensorless FOC solution, the time to market can be shortened.

The motor temperature is estimated according to the change of winding resistance to protect the motor from damage in case of temporary overload.

System block diagram

ESC module block diagram

Uav system block diagram