Old is Gold: Traditional Unparalleled Servo Motion Control

 

The evolutionary concept of Servo Motion Control did not pass through any significant change over the last 50 years. The servo amplifier, being a part of a closed-loop control system is still used to control an assembly positioning system. The sensor less brushless motor controller used in a variety of electro-mechanical and electrical machines now-a-days is based on the traditional theory and algorithms of servo motion control.

 

A little insight into servo motion control: First we need to understand what a typical motor controller is and what it exactly does. It is a single or collection of device(s) governing in pre-determined manner to control the performance of any electrical motor. The controller itself includes a manual or automatic measure to start/stop, selecting as well as regulating the torque and the speed, selecting the direction of rotation. Some failsafe measures should also be there like protecting itself against overloads and other faults.

 

An electric motor controller can further be classified according to the type of motor to be driven. Servo amplifier is one of those types using error-sensing negative feedback in order to correct the performance and accuracy of a mechanism. It is a special kind of electronic amplifier used to power up electric servomechanisms following the algorithm of servo motion control. It monitors the feedback signal from the servomechanism and performs contiguous adjustments for deviation from any expected behavior.

 

The motor being used is not mandatory to be a servo motor. In case of a servo motor being used, the servo amplifier first receives a host command signal from the control unit, then amplifies it as usual, and finally transmits current to the motor for producing motion in it. In this typical case, a sensor is generally attached to the servo motor reporting its actual status back to the servo amplifier.

 

Sensorless brushless motor controller or commuted motors, on the other hand are powered by direct current and have electronic commutation measurement. The limitations of brushed motors like lower efficiency and susceptibility to mechanical wear and frequent need for servicing  have been overcome by the brushless type.

 

The servo motion control is just a technique that can be used both in good old servo amplifier and the modern-age relatively cheap and much efficient sensor less brushless motor controller systems.

 

 

 

 

About the Author

Article by Jenny, content writer at Inter-Dev Internet Marketing Company, on behalf of Servotronix.com – Custom Servo Drives

 

Servo Control System— An Essential for the Manufacturing Industry

It will not be wrong to say that the whole economy of the world depends upon servo controllers. This is because any economy depends upon the manufacturing industry and this industry would cease to exist without a robust servo control system. It would be impossible to control and manage factory production lines without a servo system. In fact, wherever there is an electric motor there would be a servo control system to monitor it. It is one of the most widely used control system in today's mechanized world. Any equipment or a machine having rotating parts has a servo system.

 

A servo control system functions in two ways. It regulates the motor by maintaining a consistent speed within the motor limits even while the load output of the motor varies. It also tracks by varying the speed of a motor and load according to a specified set of values or programs.

 

A servo system with the help of an electronic amplifier transforms smaller mechanical operations to more powerful ones. The aim is to increase the productivity or highly complex machines and increase their efficiency. We will now glance through some of the advantages of a servo control system.

 

A servo control system constantly monitors how well the machine is following the command. Based on the continuous feedback that it receives, it adjusts the motions and prevents the machine from deviating from the designed path thereby making it more effective and efficient. A servo system also combats all disturbance rejection characteristics thereby handling all possible problems that a machine may face. It also improves the machine productivity. Some servo control systems are so efficient that  they result in zero waste and zero delay.

 

A servo control system reduces the incidence of accidents. Since it supervises the overall precision of the machine it prevents it from malfunctioning which happen due to various reasons like incorrect evaluations of motor parameter or some torque disturbance in shaft. The closed loop servo system continuously enhances and improves the machine efficiency. The system operates on real-time feedback.

 

The greatest advantage derived by installing a servo control system is doing away with the shaft which is the key cause of machine downtime. It performs all the jobs that are done by a shaft like differential transmissions, change gear stations, clutch and brake units.

 

Servo system has come of age. Different types and makes of servo control systems are available in the market which are being used by industries involved in hi-tech automation.

 

 

For more information about servo motion control and ac servo drives visit our website.

 

 

About the Author

Article by Jenny at Inter-dev Internet Marketing Company on behalf of Nanovibronix.com – servo

Brushless Servo System

The brushless servo systems are developed with the stator being provided with the windings or sometimes on the outer surface of the motor. Permanent magnets remain attached to the rotor. The position of the windings plays an important role in providing a shortened path for the escape of heat that is generated in the winding. The windings should be located near the finned surface of the motor for efficient heat decapitation. This is the main reason behind the increased thermal efficiency exhibited by the brushless servo system as compared to a servo system that runs on DC motor. The brushless servo motors are capable of producing higher power ratings than other same sized and specification motors.

 

In the working principal of a servo motor, reduced rotor inertia and lack of mechanical commutator limits output with respect to enhanced speeds and accelerated abilities. The encoder feedback signal is utilized by the servo controller and the drives that it controls to adjust the motor torques continuously to maintain the desired positions. This is what is known as a closed loop servo system. This is the reason why the electrical requirements of a brushless servo system are more complex and therefore expensive than other servo motors.

 

While DC servo motors use a mechanical commutator for delivering the required current to the particular torque in order to produce requisite windings. The brushless motors on the other hand require a negative feedback mechanism in order to sense the location of the rotor with the permanent magnet with respect to the kind of signal that has been sent to the windings. It is the responsibility of the servo drive to maintain the correct coordination between the magnetic vector that is produced by the windings and the position of the rotor to produce the perfect torque.

 

Advanced brushless servo systems focus on providing enhanced and effective closed loop servo performance. For this, the systems employ proprietary control of the torque with advanced servo algorithms.

 

Some of the common applications of brushless servo systems are in enhancing speed and acceleration, changing loads, clamping and pressing.

 For more information about servo motion control and ac servo drives visit our website.

  

About the Author

 

Article by Jenny at Inter-dev Internet Marketing Company on behalf of Nanovibronix.com – servo drives