Closed-loop control brings more application value to stepping motor

by:V&T Technologies     2020-01-01
Closed loop stepper motor (Hybrid servo motor) It provides high precision and high efficiency for applications requiring servo motor performance. Technological advances are changing the cost performance between stepping motors and servo motors to meet various demanding industrial automation applications. Through closed-loop technology, some economical stepping motors have entered applications that are not suitable for more expensive servo motor applications. Technological advances are changing the cost performance between stepping motors and servo motors to meet various demanding industrial automation applications. By using closed-loop technology, cheaper stepping motors are entering the field of servo motors that are only considered more expensive. The traditional view is that servo control system is beneficial to applications requiring speed higher than 800rpm and high dynamic response. Stepping motors are a better choice for applications that run at low speeds, produce low to medium accelerations, and require high holding torque. When the closed-loop stepping motor (Hybrid servo motor) When the overload stops, they will remain unchanged without losing torque. After removing the blocking load, they will continue to run. The maximum torque at any set speed can be ensured without the position sensor losing steps. Therefore, the selection of closed-loop stepping motor can closely match the torque requirements of its application without 40% extra allowance. For open-loop stepping motors, it is difficult to meet the requirement of high instantaneous torque due to the risk of losing steps. Closed-loop stepping motors can achieve very fast acceleration, can run quietly, have less resonance than traditional stepping motors, and can run at higher bandwidth. Stepper motor designers integrate electronic systems with motors to reduce wiring, simplify implementation and realize cabinet-free Motors. A global automation company has improved its precision CNC machine tools for the production and sale of windows and wooden frames. Instead of using a servo motor, it uses a closed-loop stepping motor. Before the transition, the application and process of manufacturing wood frames require 20 to 30 pneumatic and electronic servo motors per machine. The cost of servo motor is the main factor of the total cost of each machine. The number of additional cables required for a single servo encoder installed in the cabinet will prolong the installation time and complicate the maintenance work. In a pilot project to reduce costs, closed-loop stepping motors are used instead of servo motors in woodworking machinery to see if the stepping motors have achieved their performance targets. Only replace the motor, the motion controller and communication protocol remain unchanged. A few months later, with technical support, the company determined that its stepper motor-based machines had achieved their implementation goals. Because stepping motors and electronic systems are integrated, fewer cables are required and maintenance is simpler. The next step is to determine whether the machine with the stepping motor meets the accuracy, acceleration, energy consumption and other performance standards. After a month of trial operation, the company found that the closed-loop stepping motor enables 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 motors can change the cost-effectiveness of motion control. Excellent precision and energy efficiency enable stepping motors to operate in areas where expensive servo motors dominate. Closed-loop stepping motors can be used for multi-axis applications, positioning tasks when load changes, and applications requiring quiet operation, short setup time and high accuracy. TAG stepping motor, closed loop control
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