Simple servomotors may use resistive potentiometers as their position encoder. Much work was done with these systems in the development of radar and anti-aircraft artillery during World War II. The first servomotors were developed with synchros as their encoders. Many applications, such as laser cutting machines, may be offered in two ranges, the low-priced range using stepper motors and the high-performance range using servomotors. There is also no need to tune the PID controller on a closed loop stepper system. The main benefit of a closed-loop stepper motor is its relatively low cost. They act like servomotors but have some differences in their software control to get smooth motion. There has been increasing popularity in closed-loop stepper motors in recent years. With larger systems, where a powerful motor represents an increasing proportion of the system cost, servomotors have the advantage. The encoder and controller of a servomotor are an additional cost, but they optimize the performance of the overall system (for all of speed, power, and accuracy) relative to the capacity of the basic motor. The lack of feedback of a stepper motor limits its performance, as the stepper motor can only drive a load that is well within its capacity, otherwise missed steps under load may lead to positioning errors and the system may have to be restarted or recalibrated. A servomotor can immediately turn to whatever angle the controller instructs it to, regardless of the initial position at power up if an absolute encoder is used. This can be observed when switching on an inkjet printer the controller will move the ink jet carrier to the extreme left and right to establish the end positions. Therefore, on the first power-up, the controller will have to activate the stepper motor and turn it to a known position, e.g. This often allows them to be used as an open-loop position control, without any feedback encoder, as their drive signal specifies the number of steps of movement to rotate, but for this, the controller needs to 'know' the position of the stepper motor on power up. Stepper motors have some inherent ability to control position, as they have built-in output steps. Servomotors are generally used as a high-performance alternative to the stepper motor. JSTOR ( March 2016) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this Section. This Section needs additional citations for verification. Both of these enhancements, usually in combination with a PID control algorithm, allow the servomotor to be brought to its commanded position more quickly and more precisely, with less overshooting. A variable-speed drive is used to control the motor speed. More sophisticated servomotors make use of an Absolute Encoder (a type of rotary encoder) to calculate the shafts position and infer the speed of the output shaft. This type of servomotor is not widely used in industrial motion control, but it forms the basis of the simple and cheap servos used for radio-controlled models. The very simplest servomotors use position-only sensing via a potentiometer and bang-bang control of their motor the motor always rotates at full speed (or is stopped). As the positions approach, the error signal reduces to zero, and the motor stops. If the output position differs from that required, an error signal is generated which then causes the motor to rotate in either direction, as needed to bring the output shaft to the appropriate position. The measured position of the output is compared to the command position, the external input to the controller. In the simplest case, only the position is measured. The motor is paired with some type of position encoder to provide position and speed feedback. The input to its control is a signal (either analog or digital) representing the position commanded for the output shaft. Servomotors are used in applications such as robotics, CNC machinery, and automated manufacturing.Ī servomotor is a closed-loop servomechanism that uses position feedback to control its motion and final position. Servomotors are not a specific class of motor, although the term servomotor is often used to refer to a motor suitable for use in a closed-loop control system. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors. It consists of a suitable motor coupled to a sensor for position feedback. Industrial servomotors and gearboxes, with standardised flange mountings for interchangeabilityĪ servomotor (or servo motor) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity, and acceleration.
0 Comments
Leave a Reply. |