Closed-loop stepping motor with higher precision and efficiency

by:V&T Technologies     2020-01-01
Higher precision and efficiency of closed-loop stepping motors technological advances are changing the cost performance between stepping motors and servo motors to meet various demanding industrial automation applications. By adopting closed-loop technology, cheaper stepping motors are entering some fields that are considered to be applicable only to more expensive servo motors. The traditional view is that servo control system has advantages in applications requiring speed greater than 800 revolutions per minute and high dynamic response. Stepping motors are a better choice for applications that run at low speeds, generate medium and low accelerations, and require high holding torque. When the closed-loop stepping motors are overloaded to stall, they will remain without losing torque. After the blocking loads are removed, they continue to run. Under the condition that the position sensor ensures that the number of steps will not be lost, the maximum torque at any set speed can be guaranteed. Therefore, the selection of closed-loop stepping motors can be closely matched with the torque requirements of their applications without an additional allowance of 40%. For open-loop stepping motors, the requirement of high instantaneous torque is difficult to realize due to the risk of losing steps. The closed-loop stepping motor can achieve fast acceleration, can operate silently, has less resonance compared with the traditional stepping motor, and can operate at higher bandwidth. Designers of stepping motors integrate electronic systems with motors, which can reduce cable wiring, simplify the implementation process, and realize cabinet-free machines. A global automation company has improved its precision CNC machine tools for window wooden frame processing, replacing servo motors with closed-loop stepping motors. Before the transition, the application and process of manufacturing wooden frames require the use of 20 to 30 pneumatic and electronic servo motors in each machine. The cost of servo motor is the main influencing factor for the overall cost of each machine. The number of additional cables required for the single servo encoder installed in the cabinet increases the installation time and makes maintenance more complicated. In a pilot project to reduce costs, a closed-loop stepping motor is used instead of a servo motor in a wood processing machine to see if the stepping motor has achieved its performance target. Only by changing the motor, the motion controller and communication protocol remain unchanged. A few months later, with technical support, the company determined that its stepping motor-based machine had achieved its implementation goal. Because stepping motors are integrated with electronic systems, fewer cables are required, so maintenance is simpler. The next step is to determine whether the machine with the stepping motor can meet the accuracy, acceleration, energy consumption and other performance indicators. After a month of trial operation, the company found that the closed-loop stepping motor allowed its machine to meet all technical specifications and machine performance requirements, at the same time, the complexity is reduced and the cost per machine is reduced by more than 5%. Closed-loop stepping motor can change the cost performance of motion control. Superior precision and energy efficiency enable stepping motors to operate in areas dominated by more expensive servo motors. The closed-loop stepping motor can work in multi-axis applications, positioning tasks when load changes, and applications requiring silent operation, short stabilization time and high precision requirements. Related reading: Difference between stepping motor locked synchronous motor and asynchronous motor TAG closed loop stepping motor
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