ModalAI’s Electronic Speed Controllers (ESCs) are high-performing, closed-loop speed controllers that use a digital interface (UART, i2c in future).
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Brushless Electronic Speed Controllers (ESCs ) are devices that consist of hardware and software for controlling three-phase brushless DC (BLDC ) motors. ESCs communicate with the flight controller, which instructs the ESCs how fast the motor should spin.
ModalAI’s ESCs implement the following advanced features:
Full integration with ModalAI VOXL and Flight Core PCBs Bi-directional UART communication with checksum; status and fault monitoring Real-time status and health reporting at high update rate (100Hz+ each) Closed-loop RPM control for best flight performance LED control from flight controller via UART Feature ModalAI 4-in-1 ESC (M0129) ModalAI 4-in-1 ESC (M0134) ModalAI 4-in-1 ESC (M0138) Nominal Input Voltage 6.0V-16.8V (2-4S Lipo) 6.0V-16.8V (2-4S Lipo) 6.0V-26V (2-6S Lipo) 6.0V-25.2V (2-6S Lipo) (M0134-6) VOXL Power Output 3.8V or 5.0V @ 5A (6A 30 sec) ❌ 5.0V or 3.8V @ 6A Aux Power Output 1x 3.3V / 5.0V 500mA 1x 5.0V 500mA 1x 3.3V/5.0V 500mA, 1x 16.8V 500mA Max Continuous Current Per Motor 20A (thermally limited, requires airflow) 20A (thermally limited, requires airflow) 40A (thermally limited, requires airflow) Max Burst Current Per Motor 30-40A for <1s 40-50A for <1s 100A for <1s MCU STM32F051K86 STM32F051K86 STM32F051K86 MOSFET Driver MP6531A MP6530 (M0134-1) MP6531A MP6531A (M0134-3, M0134-6) MOSFETs AON7528 (N) AON7528 (N) TBD Current Sensing 1x 0.5mOhm + INA186 (-20A..+110A) 4x 0.5mOhm + INA186 (-10A..+55A) 1x 0.25mOhm + INA186 (-35A..+200A) ESD signal protection ✅ ✅ ✅ Temperature Sensing ✅ (internal to MCU) ✅ (internal to MCU) ✅ (internal to MCU + top and bottom) On-board Status LEDs ✅ 4x ✅ 4x ✅ 4x External LEDs 1x Neopixel LED output 2x Neopixel LED outputs 1x Neopixel LED output Secure Bootloader Yes (AES256) Yes (AES256) Yes (AES256) Motor PWM Switching Frequency 48, 24 Khz 48, 24 Khz 48, 24 Khz Maximum RPM (6 pole pairs) 50K+ 50K+ 50K+ PWM control input (1-2ms) ✅ ✅ ❌ PWM output ✅ 4x (shared with PWM input) ✅ 4x (shared with PWM input) ✅ 2x Active Freewheeling ✅ ✅ ✅ Disable Regenerative Braking Always enabled Always enabled (M0134-1) ✅ Option to disable ✅ Option to disable (M0134-3, M0134-6) Tone Generation ✅ ✅ ✅ Closed-loop RPM Control Yes (10Khz) Yes (10Khz) Yes (10Khz) Number of UART ports 2 (2Mbit+) 2 (2Mbit+) 1 (2Mbit+) voxl_esc UART Protocol✅ ✅ ✅ UART connector type JST GH 4-pin Hirose DF13 6-pin JST GH 4-pin UART Cable (for VOXL2) mcbl-00015 mcbl-00029 mcbl-00015 Weight without wires (g) 5.9 9.5 17.9 Board Dimensions (mm) 36.5 x 36.5 40.5 x 40.5 45.5 x 59.0 Mounting Hole Size, Pattern (mm) 2.5, 30.5 x 30.5 3.05, 31.0 x 33.0 3.05, 30.5 x 30.5 Notes
M0049 M0117
Feature ModalAI 4-in-1 ESC (M0049) ModalAI 4-in-1 ESC (M0117) Nominal Input Voltage 6.0V-16.8V (2-4S Lipo) 6.0V-16.8V (2-4S Lipo) Aux Power Output 1x 4.5V, 1x 5.0V (adj) 600mA each 1x 5.0V (adjustable) 600mA Max Continuous Current Per Motor 20A (thermally limited) 20A (thermally limited) Max Burst Current Per Motor 40-50A (requires airflow and heat-spreader) 40-50A (requires airflow and heat-spreader) MCU STM32F051K86 STM32F051C6U6 MOSFET Driver MP6530 MP6530 (M0117-1) MP6531A (M0117-3) MOSFETs AON7528 (N) AON7528 (N) Individual Current Sensing 4x 1mOhm + INA186 4x 0.5mOhm + INA186 ESD signal protection ✅ ✅ Temperature Sensing ✅ ✅ On-board Status LEDs ✅ ✅ External LEDs Neopixel LEDs N/A Secure Bootloader Yes (AES256) Yes (AES256) PWM Switching Frequency 48, 24 Khz 48, 24 Khz Maximum RPM (6 pole pairs) 50K+ 50K+ PWM control input ✅ ✅ Active Freewheeling ✅ ✅ Disable Regenerative Braking ❌ Always enabled ❌ Always enabled (M0117-1) ✅ (M0117-3) Tone Generation ✅ ✅ Closed-loop RPM Control Yes (10Khz) Yes (10Khz) Number of UART ports 2 (2Mbit+) 2 (2Mbit+) modal_io UART Protocol✅ ✅ Weight without wires (g) 9.5 9.5 Board Dimensions (mm) 40.5 x 40.5 40.5 x 40.5 Mounting Hole Size, Pattern (mm) 3.05, 31.0 x 33.0 3.05, 31.0 x 33.0 Notes limited availability limited availability
