1. Mechanical damage
The most common fault of servo response encoder is various mechanical damage, including hardware damage to the encoder's internal component structure (code disc, shaft, bearing, etc.) due to mechanical oscillation, collision, impact, wear and tear.
1) Oscillation
Excessive mechanical oscillation poles can cause damage to the encoder disc, shaft and bearing. As far as servo reaction is concerned, some oscillations are caused by the oscillation of the motor body, such as: the oscillation of the mechanical structure where the motor is located, the continuous movement of the motor demand with the load, etc., this situation is relatively easy to prevent and avoid, because this oscillation looks more intuitive, and it is easy to measure and adopt corrective measures, as long as the oscillation intensity of the motor body can be controlled within its nominal oscillation level (acceleration and frequency) range, it can basically avoid the damage caused by this oscillation to the servo motor and the reaction. There are also some conditions, the oscillation is caused by the rotation of the mechanical shaft during the operation of the motor, for example: the output side of the servo motor shaft is subjected to excessive axial force effect, and the axial oscillation of the encoder mechanical shaft is formed by the forward and backward movement during work; Perhaps, when the servo motor is working, its output shaft is subjected to excessive radial force for a long time, resulting in wear and tear of the motor shaft and bearings, which causes the motor shaft to oscillate strongly due to eccentricity when rotating at high speed.
These oscillations are basically not much related to the oscillation of the motor body and the mechanical structure of the equipment, but are closely related to the force of the output shaft and the wear of the shaft/bearing when the motor is running. At the same time, because this kind of oscillation mainly occurs on the mechanical shaft that rotates at high speed inside the motor, it has a strong concealment, and its damage is often overlooked.
2) Shock
As with all electromechanical products, servo motors and reaction encoders will have nominal rated shock acceleration limits. Excessive impact forces may result in damage to the servo encoder disc, shafts, bearings, integrated circuit boards and chips, or even the destruction and scrapping of the entire reaction encoder. Therefore, in the process of using the servo motor, it is necessary to avoid the impact of any external force on the body as much as possible, especially to avoid the collision and knocking on the motor output shaft, whether it is from the axial or radial direction, for example: when installing various transmission shaft sleeves (synchronous pulleys, couplings, reducer shaft sleeves, etc.) on the motor output shaft, perhaps in the process of installing the motor to the transmission organization, do not knock the motor shaft and the shell body hard.
3) Wear and tear
Another type of mechanical damage is the wear of the servo-response encoder shaft and bearings. Although it is not very common, it needs to be taken seriously. It may be caused by prolonged oscillation (axial or radial) of the motor shaft; It may also be caused by the overspeed work of the motor shaft, although the general servo motor rarely presents the situation of overspeed, and the maximum promised speed of the reaction encoder is much higher than the peak speed of the servo motor, but in some abnormal conditions, such as: the reaction signal is disturbed, the servo motor setting error, the vertical load falls out of control, etc., the risk of damage to the reaction encoder due to the motor "being" overspeed work still exists.
2. Electrical damage
Electrical damage is also a common occurrence in various servo-response encoder faults. On the one hand, when the servo motor and encoder response circuit are in the electromechanical system environment with poor electromagnetic compatibility function, the signal circuit may be disturbed by strong electromagnetic noise and the extremely high (thousands or even tens of thousands of volts) high-frequency impulse voltage may occur instantaneously, resulting in the damage of the encoder signal circuit. On the other hand, the abnormality of the encoder's external circuits, such as short circuits, open circuits, wrong wires, reverse polarity, abnormal power supply (such as shaking), etc., may also cause electrical faults or damage to the servo reaction.
The first two faults should be regarded as relatively simple electrical faults, and the electrical faults of general-purpose encoders are the same. There is also an electrical damage that is specific to the servo reaction and is caused by mechanical damage to the motor. If the servo motor is working, because the output shaft is subjected to excessive axial or radial force for a long time, the shaft and bearing are worn, and a lot of metal chips and dust will occur inside the motor, and when these metal dusts adhere to the circuit board of the reaction encoder, it is very likely that the internal circuit will be faulty or damaged due to short circuit.
3. Environmental impact
First of all, it still refers to the physical environment where the servo motor is located, including: humidity, temperature, dripping, oil, dust, corrosion... Wait a minute. In the maintenance report of many faulty servo motors after returning to the factory, it will be said that the reaction encoder is damaged due to the erosion of pollutants, such as immersion, dust, etc. There are many reasons for pollutants to enter the internal of the motor, perhaps because the protection level of the motor itself is not enough to withstand the harsh use environment, so the IP protection level of the servo motor itself, as well as the environmental protection measures adopted during product use integration and operation and maintenance, are very important.
However, it is still not enough to protect the use of the servo motor, because it will also be affected by the internal environment of the motor in terms of servo reaction. From the perspective of pollutants, the protection level of the servo reaction encoder is mostly IP20 - IP40, if the servo motor is working, its output shaft is subjected to excessive axial or radial force effect for a long time, it will form the wear of the motor shaft and bearing, so that a lot of dust and debris occur inside the motor, they may not only cause damage to its internal circuit due to attachment to the circuit board of the reaction encoder, but also may affect the heat dissipation of electrical components and the lubrication of mechanical bearings due to many accumulations. And this actually has nothing to do with the level of protection of the servo motor itself. If you look at the influence of the servo response encoder in terms of temperature, it is mainly from the inside of the servo motor, because the actual temperature of the winding coil in continuous operation is often much higher than the surrounding ambient temperature, which is a great challenge and threat for the servo response encoder installed at the end of the motor shaft. Generally, the operating temperature range of servo reaction can reach +110°C - +120°C, and too high motor operating temperature may lead to unstable operation or even heat damage to the internal circuit of the reaction encoder. Therefore, it is also very important to reasonably plan the operating cycle and operating load of the servo motor to avoid excessive winding temperature, and to protect the reactive encoder integrated in it.
|
More on that
|
Classification of electrical strain gauges – Turck
Resistance strain gauge is a kind of element used to measure strain, which is made of 0.02-0.05mm diameter constantan wire or nickel-chromium wire wound into a grid (or corroded into a grid with a very thin metal foil) in two layers of insulating sheet (substrate), and is connected with tinned copper wire and strain gauge wire as a strain.
|
|
Advantages of eddy-current displacement sensors – Turck
The cutting-edge technology of modern science and technology, and its horizontal concave and convex are also one of the important indicators to measure the level of scientific and technological development of a country. There are many kinds of displacement sensors on the market, such as eddy current displacement sensors, which are widely used in various industries. So what are the advantages of eddy-current displacement sensors ...
|
|
Turck's BL ident with long-range UHF technology
BL ident products with long-interval UHF technology from Turck can be used in product control, logistics or process automation systems. Compared to HF, UHF has a longer read/write interval. UHF modules can be sensitively integrated into the BL ident system without the need for messy equipment ...
|
|
Turck's solution to the problem of torque sensors
Torque sensors are generally used to measure the magnitude and direction of the driver's torque acting on the steering wheel and convert it into an electrical signal. The power steering ECU receives this signal and the vehicle speed signal, confirms the direction and size of the auxiliary power, and then reduces the steering torque when traveling at low speeds.
|
|
Introduction to the types of flow sensors – Turck
Flow is an important parameter in industrial production, in the process of industrial production, many raw materials, semi-finished products, and finished products are presented in a fluid state. The flow rate of the fluid has become the key to determining the composition and quality of the product, and it is also an important basis for production cost accounting and rational use of energy. Thus...
|
|
Advantages of Turck's decentralised automation technology
Modularity will win over the field of mechanical engineering, but it is fully in line with expectations and reasonable. Other occupations may have successfully transitioned from craft production to continuous production. In the case of continuous production, the power can be increased through large-scale production. The monotonous process will be automated, so that the employee ...
|
|
5 common pressure sensors – Turck sensors
1. Piezoresistive force sensor:
Resistive strain gauges are one of the first components of piezoresistive strain transducers. The operating principle of metal resistance strain gauge is the phenomenon that the resistance value of the strain resistance adsorbed on the matrix data changes with mechanical deformation, which is commonly known as the resistance strain effect.
...
|
|
Features of small torque sensors – Turck
1. Confirm the type of force sensor: There are two types of force sensors, one is electromechanical and the other is electronic.
2. Confirm the type of equipment: Acknowledge whether the equipment is a control circuit or a power circuit, and then purchase it as needed.
3. ...
|
|
Turck's proximity switch principle and precautions
How Turck's proximity switches work
The proximity switch has stable performance, and there is a sensitive adjuster at the tail, which can effectively adjust the distance according to the size. Stability, long detection distance. There are buried and non-embedded. When an object moves towards the proximity switch and approaches to a certain distance, there is a "sense" ...
|
|
The communication of the Lizhun Sensing digital transmitter uses the communication interface - Turck
The communication interface of the digital transmitter of Lizhun sensing is selected, and the special interface is selected. The handling RT module enables HART communication with the transmitter. Digital Combined Pressure/Differential Variable is a multi-functional digital intelligent instrument developed by JIAKE, including capacitive pressure/differential pressure transmitter and direct combined pressure/differential pressure.
|
|
Common pressure sensors – Turck sensors
Dispersion silicon pressure sensor: sophisticated, widely used, cost-effective, gauge pressure measurement is the mainstream, and a few absolute pressure, strong overload and impact resistance, but can only measure the medium below 120 °C. The micro-range accuracy is slightly lower;
...
|
|
Introduction to piezoresistive pressure sensors – Turck
What is the principle of piezoresistive pressure sensors?
Piezoresistive sensors refer to sensors made of the piezoresistive effect of monocrystalline silicon materials and integrated circuit technology. After the monocrystalline silicon data is subjected to the action of force, the resistivity changes, and the proportional force can be obtained according to the measurement circuit.
|
|
Instructions for use of Turck's proximity switches
1) There is a difference between the two-wire system and the three-wire system of the proximity switch, and the three-wire system proximity switch is divided into NPN type and PNP type, and their wiring is different
2) The wiring of the two-wire proximity switch is relatively simple, and the proximity switch can be connected to the power supply after being connected to the load in series.
3) Three-wire proximity switch ...
|
|
Analyze the advantages of Turck's modular automation
Choose a modular principle instead of a static line
Turck's compact IP67 marginal controllers or block I/O modules enable distributed control of logistics plant processes. These autonomous modules can be used via Profinet, Ethernet/IP or Modbus TCP with multiprotocol Ethernet ...
|
|
Key points for the selection of displacement sensors
The selection of displacement sensors should meet the requirements of the following objectives:
1. Technical objectives in terms of sensitivity
For an instrument, the higher the sensitivity, the better, because the more sensitive, the simpler the change in the acceleration generated by the surrounding environment will be, and the acceleration ...
|
|
Turck's fail-safe product family
Fail-safe systems are now an integral part of machinery and plant automation. With the latest complete fail-safe modules, Turck continues to be a driver of distributed automation concepts in these areas and provides support for those who plan to develop a wide range of products in the field of machine hardware and related ...
|
|
Intake pressure sensor failure response – Turck
1. The internal circuit of the sensor is open or short-circuited;
2. The output signal of the sensor cannot change with the change of the vacuum degree of the inlet pipe;
3. The voltage of the output signal of the sensor is too large or too small, and its value violates the stop range.
...
|
|
Composition and classification of sensors – Turck
1. Composition of the sensor
A sensor typically consists of a sensitive element, a conversion element, and a basic conversion circuit, as shown in Figure 1. A sensitive element is an element that can sensitively feel the scene being measured and respond to a definite relationship; The conversion element is to convert the measured touch of the sensitive element into ...
|
|
Choice of temperature sensors – Turck
(1) Whether the temperature of the measured target needs to be recorded, alarmed and automatically controlled, and whether it needs to be measured and transmitted at a distance.
(2) The size and accuracy of the temperature measurement range.
(3) Whether the size of the temperature measuring element is appropriate.
(4) Tested ...
|
|
Turck's flow sensing with text display
The FS101 sensor with alphanumeric display continues the operation and commissioning of Turck's FS+ fluid sensor series, which Turck has added to its FS+ fluid sensor series. The new FS+ sensor has the same look and feel, with the same look and feel as all its ...
|
|
Contact
working hours
