Why do Robot Joints Use an External Rotor Brushless Motor?

The outer rotor brushless motor is an advanced motor type with high efficiency, precision and reliability. It uses a brushless design, which eliminates the need to use a carbon brush in the traditional model. This makes the external rotor brushless motor more efficient, quieter and more reliable. At the same time, due to the carbon-free brush design, so its service life is longer, better maintainability. Suitable for various applications, including aviation, aerospace, shipping, automotive and industrial machinery. In these fields, motors with high efficiency, high precision and high reliability are crucial. The appearance of the outer rotor brushless motor can just meet this demand. It is worth mentioning that, due to its working principle, it can also reduce the loss of energy in the process of converting electricity into mechanical energy. This makes it a very energy-saving and environmentally friendly motor type, and therefore it has been widely used in new energy vehicles, wind energy and solar energy fields.

The application principle of external rotor brushless motor is based on the mature application of uniform electronic control technology and data transmission technology, which controls the motor speed by electronic control transmission current, and realizes the control speed and movement direction of the motor. The rotor part is a strong magnet, and then the stator coil is added to the outside. The magnetic flux inside the stator coil can stimulate the magnetic field of the rotor part to realize the operation of the motor and the interaction between the magnet part of the rotor and the coil part of the stator. Using electronic speed control technology, through the sensor and master power converter, motor speed and steering. Power unit provides power and stable output. The electric power converter converts the AC power supply into the stable direct current required for the motor, while controlling the speed and steering of the motor. By detecting the rotor position of the motor, the sensor transmits the data to the master control chip. The master control chip determines the direction and size of the current through a specific control strategy, and controls the torque and motor speed, so as to realize the movement of the motor. In multi-axis robots, model aircraft, electric tools, high-speed trains, electric vehicles, photovoltaic power generation systems and other fields, have a wide range of applications, become an essential power source in modern industrial production.

In the robot joint, the external rotor brushless motor has certain advantages compared with the ordinary brushless motor. First of all, the rotor of the external rotor brushless motor adopts the external design, which makes the rotor lighter and the speed higher. When the rotor rotates at a high speed, the wind resistance is reduced, which can greatly reduce the rotor loss and mechanical noise, and enhance the efficiency and stability of the whole system. Secondly, compared with the internal rotor, it has less heat, lower temperature rise, and the motor life is longer. In high load, high speed, high temperature environment, its efficiency can maintain a certain stability, and the noise and vibration is smaller. In addition, because most of the rotor is external, the stator core can be larger, making the motor with more teeth and smaller magnetic resistance. Under the same size rotor, it can make better use of the magnetic field, improve the torque output, and also make the torque smoothness and accuracy higher. Finally, it is not only reflected in performance, but also more convenient and economical in installation and maintenance. The outer rotor motor is part of the whole mechanical system, which is relatively simple and does not require complicated support and drive mechanism. At the same time, because of its long life, so it can reduce the maintenance cost and use cost, is an ideal replacement for ordinary brushless motor.

There are many technical difficulties in the shutdown motor of the robot, including but not limited to the following. Smaller design. The robot joint motor needs to achieve high speed, high precision and high torque movement in the extreme space, and the volume and weight of the robot itself are usually very large, so the joint motor needs to achieve high performance in a small space, which puts forward high requirements for the design and manufacturing of the motor.control system design. The robot joint motor needs to accurately control the position, speed and acceleration and other parameters, which requires the control system of the motor to have high accuracy and fast response speed, while having good robustness and stability, to adapt to different working environments and working loads. Dynamic performance matching. Each joint motor of the robot needs to maintain the same output power and torque at the same speed and load, otherwise it will lead to the robot's movement imbalance, accuracy decline or even out of control. Therefore, the dynamic performance of the joint motor needs fine matching and debugging.durability design. The robot joint motor needs to operate frequently and bear the large load in the work, which puts forward high requirements for the durability and stability of the motor. The structural design and material selection of the motor need to take into account the ability to withstand frequent vibration and impact, and the motor needs to prevent overheating and overload to ensure the life and stability of the motor.

Why mostly use the external rotor brushless motor in the robot joint? Because of the good motor stability. Traditional motor often causes motion instability due to friction of mechanical parts; while external rotor brushless motor adopts brushless rotor structure to get rid of mechanical friction, so it has more stable motion characteristics. This makes the robot movement more accurate, more accurate control, and can effectively improve the production efficiency and production quality of the robot. Secondly, the system response speed is fast. Robotic tasks often require rapid response and rapid changes in the speed of the motor running. The external rotor brushless motor can respond faster to changes, change the running speed, reduce the impact of system changes, and reduce the deviation of control. This allows the robot to move more flexibly and to better adapt to task changes. Finally, it has a good durability. Robots usually carry large weight and require the motor to work for a long time to maintain high efficiency. The brushless motor of the outer rotor adopts new materials and structures, which ensure the operation of the robot for a long time and at a high frequency, reduce the motor damage and other problems, and also make the robot has a longer service life.

The above is our VSD motor to share with you about the application of the external rotor motor on the robot joint expertise. For more information, please contact our professional customer service personnel to answer. Thank you for clicking and watching.