Different Types of Servo Motors


Different types of servo motors are there according to their application, such as AC servo motor, DC servo motor, DC brushless servomotor, positional rotation, continuous rotation and linear servomotor, etc. Typical servomotors consist of three cables, namely, power and ground control. The shape and size of these engines depend on their applications. The RC servo motor is the most common type of servomotor used in hobby applications, robotics due to its simplicity, affordability and reliability of microprocessor control

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What is servo motors? How it works?

DC Servo Motor

D.C. Servo Motors may be used to provide a corrective action in remote control positioning systems or in controlled velocity drive mechanisms. They may also be used as a small power drive operating in open loop controls.The motor which is used as a DC servo motor generally has a separate source in the field of winding & armature winding. The control can be archived either by controlling the armature current or field current. Field control includes some particular advantages over armature control. In the same way armature control includes some advantages over field control. Based on the applications the control should be applied to the DC servo motor. DC servo motor provides very accurate and also fast response to start or stop command signals due to the low armature inductive reactance. DC servo motors are used in similar equipments and computerized numerically controlled machines.

Typical Applications:
– Infra-red Detector Scanning
– Optical Scanning Drives
– Antenna Drive Systems
– Valve Actuation
– Camera Color Mechanisms

AC Servo Motor

AC servo motor is an AC motor that includes encoder is used with controllers for giving closed loop control and feedback. This motor can be placed to high accuracy and also controlled precisely as compulsory for the applications. Frequently these motors have higher designs of tolerance or better bearings and some simple designs also use higher voltages in order to accomplish greater torque. Applications of an AC motor mainly involve in automation, robotics, CNC machinery, and other applications a high level of precision and needful versatility.

The main difference between a standard split-phase induction motor and an AC motor is that the rotor of the squirrel cage of a servo motor has been made with thinner bus bars, so that the motor resistance is higher.

Positional Rotation Servo Motor

Positional rotation servo motor is a most common type of servo motor. The shaft’s o/p rotates in about 180°. It includes physical stops located in the gear mechanism to stop turning outside these limits to guard the rotation sensor. These common servos involve in radio controlled water, radio controlled cars, aircraft, robots, toys and many other applications.

Continuous Rotation Servo Motor

Continuous rotation servo motor is quite related to the common positional rotation servo motor, but it can go in any direction indefinitely. The control signal, rather than set the static position of the servo, is understood as the speed and direction of rotation. The range of potential commands sources the servo to rotate clockwise or anticlockwise as preferred, at changing speed, depending on the command signal. This type of motor is used in a radar dish if you are riding one on a robot or you can use one as a drive motor on a mobile robot.

Linear Servo Motor

Linear servo motor is also similar the positional rotation servo motor is discussed above, but with an extra gears to alter the o/p from circular to back-and-forth. These servo motors are not simple to find, but sometimes you can find them at hobby stores where they are used as actuators in higher model airplanes.

Linear Servo Motorc

                            Linear Servo Motor

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