Tag: servo motor

In terms of usage, the servo motor is mainly responsible for the feed of the machine tool, making the workpiece move to the tool or the tool move to the workpiece, mainly to realize the work of cutting, with higher requirements for torque and control accuracy; while the spindle motor is mainly responsible for driving the spindle of the machine tool, driving the workpiece or the tool head to rotate, with higher requirements for constant power characteristic output to meet the sufficient torque output capability at different speeds. Therefore, when designing, these two motors will make targeted parameter optimization according to their application requirements respectively.

Speed control is generally achieved by inverters, servo motors to do speed control, is generally used for rapid acceleration and deceleration or speed precision control occasions, because relative to the inverter, servo motors can reach thousands of revolutions within a few millimeters, because the servo is closed-loop, the speed is very stable. Torque control is mainly to control the output torque of the servo motor, again because of the fast response of the servo motor. Application of the above two kinds of control, you can treat the servo drive as a frequency converter, generally with analog control.

In industrial applications such as automation technology, servo motor is the most commonly used high-tech equipment. Servo motor can control speed and position accuracy, also can convert voltage signals into torque and speed to drive control objects. Servo motor is divided into AC servo and DC servo two categories.

In the servo system, the engine that controls the operation of mechanical components is called servo motor, which is a kind of subsidized motor indirect variable speed device that can control the speed, so that the position of the object and the orientation, state and other output controlled quantities can follow the input target (or a given value) of any change, and the position accuracy of the servo motor is very high, and it can convert the voltage signal into torque and speed to drive the control object, but how does a servo motor control work?

No matter what kind of servo motor, use for a long time, will produce some small problems, then today we bring you six common motor failure performances. When the servo motor has small problems, not only to detect promptly, but also to find the cause of these failures, we can prescribe the right medicine to repair the servo motor.

Servo motor is an independent electrical device, which can rotate each part of the machine with high efficiency and precision. The output shaft of this motor can be moved to a specific angle, position, and velocity that a normal motor does not have. Servo motor adopts conventional motor and its position feedback with the sensor. Before using the servo motor, you need to know how to use it to better play its role.

The operating principle of the AC spindle servo motor is that when the symmetrical three-phase winding on the stator is connected to the symmetrical three-phase, the excitation current is supplied by the power supply and a rotating magnetic field is established in the air gap between the stator and the rotor rotating at a synchronous speed. By the electromagnetic inductance, the induced potential is generated in the rotor guide bar. Because the rotor guide strip has formed a closed circuit, a current is running through the rotor guide strip. This generates electromagnetic torque and realizes the energy transformation from electrical energy to mechanical energy. ATO provides customers with a wide range of AC spindle servo motors of good quality with favorable prices.

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Servo motors are mainly classified into DC servo motors and AC servo motors. DC servo motors are divided into brush and brushless motors. Brushed motors have low cost, simple structure, large starting torque, wide speed range, easy to control and maintain (changing carbon brushes), it will generate electromagnetic interference and have specific requirements for the environment. Therefore, it is suitable for common industrial and civil occasions that are sensitive to cost.

The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small inertia, smooth in rotation, and stable in torque. The control is complex and easy to realize intelligence, and its electronic commutation method is flexible, and it can be square wave commutation or sine wave commutation. The motor is maintenance-free, highly efficient, low operating temperature, low electromagnetic radiation, long life, and can be used in various environments.

The servo motor can make the speed and position control accuracy become very accurate, and can convert the voltage signal into torque and speed to drive the control object. The speed of the servo motor rotor is controlled by the input signal and can react quickly. In automatic control systems, servo motors can be used as actuators. Servo motor has the characteristics of small electromechanical time constant and high linearity, and it can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It can be divided into two categories: DC and AC servo motors. Its main feature is that there is no autorotation when the signal voltage is zero, and the speed decreases at a uniform speed with the increase of torque.

Servo motor is also called execution motor. Its working principle is similar to that of a two-phase asynchronous motor. However, because it is used as an actuator in a CNC machine tool to convert an AC signal into an angular displacement or angular velocity on the shaft, the speed of the rotor speed is required to reflect the phase of the control signal. It does not rotate when there is no control signal.

Since the two windings on the stator are spaced apart by an electrical angle of 90°, if a symmetrical voltage with the same amplitude and a phase difference of 90° electrical angle is applied to the two-phase windings, a circular shape will be generated in the air gap of the motor. Rotating magnetic field. If the amplitude of the two voltages is not equal or the phase is not 90° electrical angle, the generated magnetic field will be an elliptical rotating magnetic field. If the signal applied to the control winding is different, the ellipticity of the generated magnetic field is also different.

In modern industrial equipment, particularly when using in the high precision conditions, the servo motor technology is developed into high torque density, as a result, the rotation speed may be up to more than 3000 rpm. With the improvement of rotation speed, power density of servo motor is also greatly improved, that means whether a servo motor needs to be matched with a reducer gearbox is mainly determined by the application need and the cost. In following application conditions, a servo planetary reducer gearbox is needed.

What is a servo motor? Servo motor is the motor which controls mechanical components operation in servo system. Servo motor can convert voltage signal to torque and speed, then to drive the control object. The control speed and position accuracy is very high. In auto control system, servo motor can response rapidly as executing component, convert the receiving electrical signal to angular displacement or angular velocity output of motor axis. The main feature is, when signal voltage is zero and no self-rotation, rotation speed will descend at even speed along with the torque increasing. Servo motor has 2 types, DC servo motor and AC servo motor.

Servo driver is a kind of controller used to control the servo motor, which belongs to the servo system. When some problems accur as follow of a servo drive, how we should test and repair? Here are 6 tips  to maintain a servo drive.

Sometimes one has to (still) use a dedicated net just for servos but that is old. Different fieldbuses and/or servo drive interfaces may support a partial frame; for example, one may only be able to set a control word which might be position or torque command while some may support a full parameter frame or command set which exposes a plethora of servo parameters and variations between the two extremes. Speed is also a consideration i.e. may only be fast enough to do motion control or fast enough to close a servo torque loops and/or fast enough to incorporate feedback devices e.g. force or range sensors (without wiring directly to the servo drive).

It depends on specific application situation, and to put it in a simple way: Nature of load (for example, vertical load or horizontal load), requirements of torque, inertia, speed, accuracy and acceleration and deceleration, requirements of upper control (such as requirements of port interface and communication), whether major controlling mode is position, torque or speed mode, whether power supply is direct or alternating current power supply, or battery powered, and voltage scope. Based on this, we can determine models of motor and supporting drives or controllers.

The fluid dispensing machine can be used for adhesive application in most industrial fluids. Most of fluid dispensing machines use stepping drive system, which has low working efficiency and cannot meet manufacturing requirements in some conditions. Using high quality dispensing system can avoid the impacts on quality and productivity of products. Therefore, based on the advantages, AC servo system with motion controller applied to the fluid dispensing machines to improve the quality and efficiency.

Nowadays, with the continuous development of technology, AC servo motor technology gradually replaced the DC motor as the leading executive motor with its excellent cost performance. The mature technology of AC servo system also makes the market develop rapidly and become one of the supporting technologies of industrial automation. So what are the main functions of servo system and how is it classified? Continue and you will learn about that.

Rewinding machine is widely in the re-winding operation and inspection operation of the material in plastics, printing, composite, coating, bag making, and coating film. With double servo automatic tension control, it can operate in the positive and reverse direction. At the same time, it has the fixed point memory stop function, which can quickly reverse to the defect position. The equipment is composed of the unreeling mechanism, take-up mechanism, deviation rectifying device, material delivery guide roller, photoelectric device, tension detection, synchronous strobeflash, length detection, operation interface, electrical control and other parts.

Motion controller usually adapts two types of command mode to control servo motor:
Digital pulse
This mode is similar to the control mode of stepper motor. The motion controller sends"pulse/direction" type pulse command signal to servo driver, when servo driver operates in position control mode, position closed loop is completed by servo driver. This mode of servo motor has the advantages that system debugging is simple and is difficult to cause interference, but has the disadvantage that the response of servo system is slightly slow.
Analog signal
In this mode, motion control system sends/-10V analog voltage command to servo driver and receives position feedback signals from position detection elements, such as motor encoder or linear grating, etc., when servo driver operates in speed control mode, position closed loop is completed by motion controller. Europe and America servo products mostly adapt such operation mode, which has the advantage that response of servo is rapid, but the disadvantage is that they are sensitive to site interference and debugging is complex.