1 E7 Tuned Propulsion System 多旋翼动力系统 User Manual 用户手册 V
2 Disclaimer Thank you for purchasing the E7 Tuned Propulsion System (hereinafter referred to as product ). Read this disclaimer carefully before using this product. By using this product, you hereby agree to this disclaimer and signify that you have read it fully. Please install and use this product in strict accordance with the User Manual. SZ DJI TECHNOLOGY CO., LTD. and its affiliated companies assume no liability for damage(s) or injuries incurred directly or indirectly from using, installing or refitting this product improperly, including but not limited to using nondesignated accessories. DJI TM is a trademark of SZ DJI TECHNOLOGY CO., LTD. (abbreviated as DJI ) and its affiliated companies. Names of products, brands, etc., appearing in this manual are trademarks or registered trademarks of their respective owner companies. This product and manual are copyrighted by DJI with all rights reserved. No part of this product or manual shall be reproduced in any form without the prior written consent of or authorization from DJI. This disclaimer is produced in various languages. In the event of variance among different versions, the Chinese version shall prevail when the product in question is purchased in China, and the English version shall prevail when the product in question is purchased in any other region. EN Legend Important Hints and Tips Warning When powered on, the motors and propellers will rotate very quickly and can cause serious damage or injuries if used improperly. Always maintain caution and make safety your top priority. AGES The E7 generates powerful thrust. Be sure to operate it with caution to avoid potential safety risks. DO NOT use the E7 if you are not an experienced user or you are under the age of DJI All Rights Reserved. 1
3 EN 1. The maximum allowable voltage of the E7 is 52.2 V. Operate with care. 2. Always fly your aircraft in areas free of people, animals, power lines, and other obstacles. 3. DO NOT approach or touch the motors or propellers when the unit is powered on. 4. Before takeoff, ensure that the propellers and motors are installed correctly and the propellers are unfolded. 5. Ensure that all parts of the aircraft are in good condition. DO NOT fly with worn or damaged parts. 6. Check the connection of the 3-phase cable between the ESC and motor before each flight. Ensure that the insulating tape is firmly attached and replace whenever required. 7. Ensure that all parts are firmly in place and all screws are tight before each flight. 8. Only use compatible, authorized DJI parts. Introduction The E7 Tuned Propulsion System is designed for multirotor aircraft with a payload of 6 to 8 kg/rotor. The system can be washed, making it ideal for industrial applications and aerial imaging in demanding environments, especially agriculture. The overall solution of a modular single rotor enhances convenience for assembly and configuration. A 4mm diameter carbon fiber tube is included in the package, while providing a wide range of tube length to choose from. The M12 motor is equipped with a weatherproof sealant for the bearing system and a coating for the motor's stator, preventing rust and corrosion. Reinforced blades and a perfected aerodynamic design minimize rotational inertia on the foldable 33-inch Z-Blade propellers to equip large platforms with sharp response. The 121 ESC uses FOC (Field-Oriented Control) algorithms to allow for more motor responsiveness and precision control. Additional protection functions extend the life of the ESC. When used with the DJI N3, A3, N3-AG or A3-AG flight controllers, the ESC data cable handles communication with the flight controller and also acts as a backup throttle signal transmission cable for increased reliability and a safer flight DJI All Rights Reserved.
4 1. Parts The Powertrain (CW 4 or CCW 4), Smart ESC Communication Cable and Updater can be purchased separately from DJI. Powertrain (CW) Powertrain (CCW) EN Smart ESC Communication Cable Updater E7 provides versions including a tube of different length for users to choose from. Contact DJI for more details: Telephone: +86 () ext Flight Controller Settings The E7 ESC features a DJI optimized FOC algorithm to offer improved performance during rotor acceleration and deceleration. The gain values and power bandwidth must be adjusted according to your flight control system and airframe. The table below shows typical parameters when using the E7 with a DJI A3 flight control system, a quad-rotor frame with a diagonal distance of 12 mm, and at a takeoff weight of 28 kg: Basic Gain Sensitivity Gain Power Bandwidth Pitch Roll Yaw Throttle Brake Attitude 13% 13% 9% 1% 35% 4% 8% 218 DJI All Rights Reserved. 3
5 3. Overview 1 2 EN Propeller 2. CW or CCW Mark 3. ESC Status Indicator 4. ESC 5. Motor 6. 3-Phase Cable 7. Arm Tube (OD 4mm) 8. Power Cables (red, VCC; black, GND) 9. Data Cable (for communication and firmware update) 1. Signal Cable (to the flight controller) 4. Installation and Connection Use a suitable airframe that can withstand the large thrust delivered by the E7 Propulsion System. The powertrain includes a 4mm diameter carbon fiber tube. Mount the powertrain to an appropriate connector only. Identify the clockwise and counter-clockwise marks on the propellers and mount the powertrains onto the corresponding positions of the airframe. When connecting cables to the frame s power system, be sure to select plugs and wires whose current is sufficiently rated the entire system. 1) Mount the powertrain onto the corresponding position of the airframe. Rotate to ensure that the propeller is oriented upright, then fix it firmly. 2) Solder the red VCC cable and black GND cable of each powertrain to the frame s power system. Make sure that the solder points are strong and that there is no chance for a short circuit. 3) Connect the signal cable to your flight controller. The signal cable s red wire transmits the control signal; the black wire is for ground. 4) When using the powertrain together with the DJI N3, A3, N3-AG or A3-AG flight controller, connect the data cable to the iesc port on the flight controller via the smart ESC communication cable for real-time communication with the DJI All Rights Reserved.
6 flight controller and redundant throttle signal transmission. Arrange the cable properly if not used, so that it will not interfere with other on-board devices. 5. Using DJI Assistant 2 The DJI ASSISTANT TM 2 is used to update the ESC firmware. Be sure to remove the propellers before using DJI Assistant 2. Powertrain Updater Computer Before using the Updater, unplug any other serial devices that are connected to your computer, then follow the instructions below: 1) Download and install DJI Assistant 2 from the official DJI website. ( 2) Connect the Updater to the powertrain with the data cable and to your computer with a Micro USB cable. 3) Connect a 12S LiPo battery to the powertrain to supply power to the system. Do not disconnect the powertrain from the computer or power supply until the configuration is complete. 4) Launch DJI Assistant 2. When a connection is established, the software will display the connected devices. 5) Click under Connected Devices to enter the firmware update page. Check the current firmware version and ensure the installed firmware is up to date. If not, login with your DJI account and click the Upgrade button. EN If your ESC is not recognized by DJI Assistant 2 (no connected devices): Check if there is more than one FTDI device connected such as another DJI Updater, an FTDI USB adapter or development board (e.g. a BeagleBone, Raspberry or Arduino board). Unplug the other FTDI devices, restart the ESC and DJI Assistant 2, and try again. Re-connect the ESC and the power supply in the following order: Connect the ESC to your computer, connect the power supply to the ESC, and then launch DJI Assistant 2. When using the ESC together with the DJI N3 or A3 flight controller, connect the data cable to the iesc port on the flight controller via the smart ESC communication cable to update all the connected ESCs firmware together in the flight controller page of DJI Assistant 2: Connect the flight controller to DJI Assistant 2 -> flight controller icon -> Firmware Update -> ESC Firmware List. 218 DJI All Rights Reserved. 5
7 EN 6. ESC Status Description The 121 smart ESC s protection and alarm functions prevent damage and extend its lifespan. ESCs status is displayed by the ESC Status Indicator and notification sounds. Status LED Sound ESC Output Cause Resolution Normal Operation Open-circuit Protection Short-circuit Protection Slow Pulsing Green 1356 Normal System Ready / Solid Green / Normal Motor Started / Solid Yellow / Normal Motors are rotating at full throttle. / Blinking Red, Yellow and Green / Stop Motor phase break or abnormal connection with the ESC when powered on. Motor cable short-circuiting, ESC output short-circuiting, or short-circuit inside the ESC. Fix problem then restart ESC. Stall Protection Blinking Red Rapidly / Stop Motor Stalled Fix problem then restart ESC. Overheated Protection Blinks Red Twice / Normal ESC internal temperature > 1. ESC internal temperature < 8. Throttle Backup* Blinking Yellow Slowly * DJI N3, A3, N3-AG or A3-AG flight controller required. / Normal Main throttle signal lost during flight, i.e. the ESC signal cable is disconnected. The system will switch to backup throttle automatically. The aircraft can fly with the backup throttle. However, it is recommended to land the aircraft and re-connect the signal cable as soon as possible.
8 Abnormal Throttle Warning Blinking Yellow Slowly Blinking Yellow Rapidly Slow Beep Single Beep Abnormal Voltage Double Warning Blinking Red and Beep Yellow Alternately Stop Stop Stop Low Voltage Warning / Normal 1. Both the main throttle and backup throttle signal were lost during flight, i.e. the ESC signal cable and data cable are disconnected. 2. Main throttle signal lost before the motor started. Starting input signal is not at the minimum. Starting input voltage is out of the range of the 12S LiPo battery, i.e. input voltage > 52.2 V or input voltage < 43.2 V. Input voltage lower than 42 V when operating. 1. Land the aircraft immediately and re-connect the cables. 2. The system will not switch to backup throttle. Re-connect the signal cable. Throttle input is smaller than 112 μs. Adjust input voltage. Voltage higher than 43.2 V. EN
9 7. Specifications EN Max Thrust 17 kg/rotor (44.4 V, Sea Level) Recommended Battery 12S LiPo Recommended Takeoff Weight 6 to 8 kg/rotor (Sea Level) Powertrain Arm Tube Outer Diameter 4 mm Operating Temperature 14 to 122 F (-1 to 5 C) ESC Max Allowable Voltage 52.2 V Max Allowable Current (Continuous) 1 A Max Peak Current (< 3 sec) 13 A PWM Input Signal Level 3.3 V / 5 V Compatible Operating Pulse Width 112 to 192 μs Signal Frequency 3 Hz to 5 Hz Battery 12S LiPo Motor Stator Size 1 15 mm KV 115 rpm/v Propeller Diameter Thread Pitch 33 9 in (84 23 mm) Weight (Single Propeller) 161 g Dimensions Ø 17 mm Ø 4 mm 136 mm C2 The corresponding powertrain dimensions and weight of each version are shown in the table below: Tube Length (mm) C DJI All Rights Reserved. L1 L2 C1 (mm) C2 (mm) L1 (mm) L2 (mm) Single Powertrain Weight (g)
10 8. Performance and Parameters Use the data below to facilitate the proper use of the propulsion system. Use the system at the recommended takeoff weight for optimal performance. DO NOT overload the system. A takeoff weight more than 1.2 times of the maximum recommended value will severely compromise safety and performance. E7 Propulsion System Performance EN Power Loading (g/w) Thrust (kg/rotor) The data above was measured with an input voltage of 44.4 V, at a temperature of 25 C and sea level. The thrust was adjusted by the throttle. Max Thrust (kg/rotor) Input Voltage (V) The data above was measured at full throttle, at a temperature of 25 C and sea level. 218 DJI All Rights Reserved. 9
11 I (A) η (%) P (W) T (kg/rotor) η T P I N (rpm) EN I Current, η Electrical Efficiency, P Input Power, T Thrust, N Rotational Speed The data above was measured with an input voltage of 44.4 V, at a temperature of 25 C and sea level. The rotational speed was adjusted by the throttle. M12 Motor Performance Performance Diagram η (%) T (N m) P η T I N (rpm) P (W) I (A) η Efficiency, Τ Torque, P Output Power, I Current, N Rotational Speed The data above contain theoretical values measured with an input voltage of 44.4 V, for reference only. When operating at a temperature of 25 C with no additional cooling devices, the motor cannot operate with a current more than 85 A. It can support short term operation (about 1 to 3 sec) with a current between 5 A and 85 A, and continuous operation with a current under 5 A. The motor run time should depend on the actual environmental temperature and cooling conditions. Characteristic Parameters Speed Constant Back-Electromotive Force Constant* Mechanical Time Constant 115 rpm/v.831 V s/rad 2.37 ms DJI All Rights Reserved.
12 Motor Rotor Inertia 512 kg mm 2 Total Rotor Inertia (Propeller Included) 7426 kg mm 2 Torque Constant* Line-to-Line Inductance** Line-to-Line Resistance Thermal Time Constant.91 N m/a 18.9 to 23.6 μh 6 mω 75 s * The Back-Electromotive Force Constant and Torque Constant may vary when the motor current is strong. The values provided mainly apply to when the motor current is under 2 A. ** The Line-to-Line Inductance was measured with a current frequency of 1 khz in an RLC circuit. It varies periodically as a function of the rotor position. 9. FAQ EN How do I replace the propeller blades or propeller adapters if they are damaged? 1) Prepare two propeller blade screws (M8 26 hex cap), four propeller adapter screws (M3 15 hex cap), and four propeller washers. 2) Apply threadlocker to the screw holes on the motor and the propeller adapter. 3) Assemble the propeller and tighten with two propeller blade screws (M8 26 hex cap) so that the blades can fold smoothly. Mount the propeller onto the motor and use four propeller adapter screws (M3 15 hex cap) to secure the propeller. Propeller Blade Screws (M8 26 Hex Cap) Propeller Adapter Screws (M3 15 Hex Cap) Propeller Washers Ensure the screw is secured tightly for the threadlocker to be effective. Ensure the threadlocker is completely dry and solid before flight to prevent the propeller from flying off the motor. This content is subject to change. Download the latest version from Copyright 218 DJI All Rights Reserved.
21 I (A) η (%) P (W) T (kg/rotor) η T P I N (rpm) CH I- 电流,η- 电效率,P- 输出功率,T- 拉力,N- 转速 以上数据均为输入电压 44.4 V 室温 25 海平面高度的环境下, 变化油门输 入调节转速测得 M12 电机性能性能曲线 η (%) T (N m) P η T I N (rpm) P (W) I (A) η- 效率,T- 扭矩,P- 输出功率,I- 电流,N- 转速以上数据均为输入电压 44.4 V 时的理论值, 仅供参考 在室温 25 无额外冷却装置的情况下, 电流超过 85 A 为不可工作区域,5-85 A 为短时 ( 约 1-3 s) 工作区域,5 A 以下为可持续工作区域 实际使用时, 请根据工作环境温度和散热条件控制电机运行时间 大疆创新版权所有