A servo system is one in which the system’s error (in position, speed, or torque) is corrected through the use of a feedback device that compares the system’s actual performance with its commanded performance. What makes a motor a servo motor, then, has less to do with its construction and operation, and more to do […]
FAQ: How are the controls for servo motors tuned?
Servo motors are used in closed loop systems and operate based on error feedback—the comparison of a target value to the value actually reached by the motor/load. Because mechanical systems have inertia and compliance, the target value is rarely achieved on the first position command—hence, the need for feedback and correction commands. Servo tuning is […]
How are servo motors physically different from motors that run open loop?
A servo motor is, by definition, one that runs closed-loop, with feedback to control the motor’s position, speed, or torque. Of motors that run open-loop, with no feedback device, stepper motors are the most common type. Despite their different control mechanisms, stepper and servo motors have a few characteristics in common. First, they both have […]
What are servomotors and integrated servomotors? Summary for design engineers
Updated May 2018 by Lisa Eitel || Nailing down the features of a servomotor is a tricky exercise, but the hallmark of any servomotor is the presence of feedback and closed-loop control. Servomotors provide precise control of torque, speed or position using closed-loop feedback. They can also operate at zero speed while maintaining enough torque to maintain a […]
What is a Servo Controller? Summary for Motion Engineers
More specific types of controllers, such as servo controllers, are used to control servomotors. When dealing with servo systems, it’s important to note that definitions for servomotor, servo system, and servo controllers can differ widely throughout industry. When selecting a servo system for an application, it’s best to ask suppliers what exactly their offerings entail. […]
Hiperface DSL encoder interface simplifies servomotor connection
Sick (www.sick.com), a German encoder manufacturer, has unveiled a new digital interface technology that simplifies servomotor connection — the Hiperface DSL (digital servo link) encoder interface. The new interface enables one cable to carry both encoder signal and power. Motors now require a single connector only, which significantly reduces costs and cabling time. For safe […]
Siemens offers new high-inertia 1FK7-HI servo motors
Siemens Industry, Inc. (www.sea.siemens.com) has unveiled its expanded 1FK7 servomotor family that features a new high-inertia style. The design’s higher rotor inertia makes the control response of the latest 1FK7-HI servo motors highly robust and ideal for variable- and high-load inertia applications, such as auxiliary and feed axes on machine tools, as well as unwinders […]
FAULHABER Expands BX4 Series Motors
The BX4 Series from FAULHABER has been expanded by twelve new 32mm Brushless DC-Servomotors. The features of the BX4 line are long operational lifetime, a high cogging-free output torque and no adhesive bonded joints. This makes them ideal for many applications like robotics, automation, medical, machinery, aerospace and aviation. The new BX4 series brushless motors […]