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The main requirements of industrial robot joint drive motors

Visit: -Release time: 2020-11-26 15:49:00
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The main requirements of industrial robot joint drive motors

    In the future industrial manufacturing, robots will be used in more and more scenarios. As a tireless "worker", the power core of the robot-the electric servo drive system is obviously the top priority. The robot electric servo drive system is an actuator that uses the torque and force generated by various motors to directly or indirectly drive the robot body to obtain various movements of the robot.

 

For industrial robot joint drive motors, maximum power-to-mass ratio and torque-to-inertia ratio, high starting torque, low inertia and a wide and smooth speed range are required. Especially for robot end effectors (claws), motors with as small volume and mass as possible should be used. Especially when fast response is required, the servo motors must have high reliability and stability, and have a large short-term overload. ability. This is a prerequisite for the application of servo motors in industrial robots.

 

 

The main requirements of the robot joint drive motor are as follows:

 

1. Rapidity

 

The time for the motor from obtaining the command signal to completing the working state required by the command should be short. The shorter the response time to the command signal, the higher the sensitivity of the electric servo system and the better the fast response performance. Generally, the electromechanical time constant of the servo motor is used to illustrate the fast response performance of the servo motor.

 

 

2. Large starting torque inertia ratio

 

In the case of driving a load, the servo motor of the robot is required to have a large starting torque and a small moment of inertia.

 

 

3. The continuity and linearity of the control characteristics. With the change of the control signal, the speed of the motor can continuously change, and sometimes it is necessary that the speed be proportional or approximately proportional to the control signal.

 

 

4. Wide speed range

It can be used in the speed range of 1:100010000.

 

 

5. Small size, small mass, and short axial size.

 

 

6. It can withstand harsh operating conditions, can perform very frequent forward and reverse, acceleration and deceleration operations, and can withstand overload in a short time.

 

 

At present, AC and DC servo motors with high starting torque, large torque, and low inertia are widely used in industrial robots. Generally, industrial robots with loads below 1000N (equivalent to 100kgf) use electric servo drive systems. The joint drive motors used are mainly AC servo motors, stepping motors and DC servo motors. Among them, AC servo motors, DC servo motors, and direct drive motors (DD) all adopt position closed-loop control, and are generally used in high-precision and high-speed robot drive systems. The stepping motor drive system is mostly suitable for small simple robot open loop systems that do not require high accuracy and speed. AC servo motors are widely used in flammable and explosive environments due to electronic commutation and no commutation sparks. The power range of the robot joint drive motor is generally 0.1-10kW.

Keywords in the article: Brush Motor   Brushless motor   DC motor   Motor manufacturers