About Servo motor 1. Working rule of servo motor Rotor inside of servo motor is permanent magnets, the U / V / W three-phase is controlled by driver and form into electromagnetic field, the rotor run in the role of this magnetic field, while the encoder in motor itself response signal to driver, the driver adjust the angel of rotor rotation according to comparison between feedback value and target value. The accuracy of the servo motor is up to encoder accuracy (number of lines). Servo motor, as engine in servo controlling system to drive mechanical components, is a implement for motor indirect speed reduction device. Also known as operation motor and is used as operation component in automatic control system to convert the signals received into motor shaft angle or replacement or angular velocity output. 2. Servo motor type and its feature Servo motor is divided into two major categories of DC and AC servo motor, its main feature is that when the signal voltage is zero, motor stop, rotation speed is evenly decreased according to torque is increased. Biggest advantage of servor motor is, to make controlling speed and position precision quite high. DC servo motor is divided into the brush and brushless motors. Brush motor, low cost, simple structure, large starting torque, wide speed adjusting range, easy to control, is needed to maintain, but easy maintenance (just replace carbon brush), produce electromagnetic interference and need a strict environment requirements. Therefore, it can be used for cost-sensitive general industrial and civil occasions. Brushless motor is, small size, light weight, large output, fast response, high-speed, low inertia, smooth rotation, torque stability, control complex, easy to realize intelligence, flexible for electronic commutation, can change direction by square wave or sine wave commutation. Motor maintenance-free, high efficiency, low operating temperature, electromagnetic radiation is very small, long life, can be used in various environments. AC servo motor is just brushless motors and is divided into synchronous and asynchronous motors; synchronous motor is often used in motion control now. The scope of its power is big and can make very high power. As it has large inertia, the speed is lowest at maximum load and speed is rapidly decreased according to power increases, therefore, it is quite suitable for low-speed applications with steady running. autom.cn autom.cn
Posted on: Mon, 17 Jun 2013 01:15:38 +0000
Trending Topics
© 2015