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Servo motor precise positioning method
- Mar 17, 2018 -

The servo mainly depends on the pulse to position, basically can understand this way, the servo motor receives 1 pulse, will rotate the angle corresponding to 1 pulse, thus realizes the displacement, because, the servo motor itself has the function that sends out the pulse, so the servo motor When you rotate one angle, it will send out the corresponding number of pulses. In this way, the pulse received by the servo motor forms a response, or is called a closed loop. In this way, the system will know how many pulses have been sent to the servo motor, and how many pulses are received at the same time. In this way, it is possible to control the rotation of the motor very precisely so that accurate positioning can be achieved up to 0.001 mm.

DC servo motors are divided into brushed and brushless motors. The brush motor has low cost, simple structure, large starting torque, wide speed range, easy control and maintenance, but it is inconvenient to maintain (for carbon brushes), generates electromagnetic interference, and has environmental requirements. It can therefore be used in cost-sensitive general industrial and civil applications. The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rotation, and stable in torque. The control is complex and it is easy to realize intelligence. The electronic commutation mode is flexible, and it can be changed by square wave or sine wave. The motor is maintenance-free, high efficiency, low operating temperature, low electromagnetic radiation, long life, and can be used in various environments. The

AC servo motors are also brushless motors, which are divided into synchronous and asynchronous motors. At present, synchronous motors are generally used in motion control. Its power range is large, and it can achieve a large power. With high inertia, the maximum rotational speed is low, and it rapidly decreases with increasing power. Therefore, it is suitable for low speed and smooth operation. The

The rotor inside the servo motor is a permanent magnet. The U/V/W three-phase electric power controlled by the servo driver forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the motor's own encoder feedback signal to the driver. The driver according to the feedback value and The target value is compared and the rotor rotation angle is adjusted. The accuracy of the servo motor is determined by the encoder accuracy (number of lines). The

The difference in function between AC servo motor and brushless DC servo motor: AC servo is better, because it is sine wave control and torque ripple is small. DC servo is a trapezoidal wave. However, the DC servo is relatively simple and inexpensive.



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