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Advantages and disadvantages of electric actuators

by:Sino Valves     2021-03-09
What are the advantages and disadvantages of electric actuators? The valve manufacturer will give you a detailed analysis: the advantages of electric actuators: (1) Convenient and easy access to energy, fast signal transmission speed, long signal transmission distance, to facilitate centralized operation and control. (2) The accuracy and sensitivity are relatively high, and it is convenient and easy to operate with other electric adjustment instruments, and the wiring and installation are simple. (3) The use effect proves that the electric actuator has good anti-deviation ability, and the output torque or thrust is basically constant, which can well overcome the unbalanced force of the medium and ensure accurate control of the relevant process parameters. Therefore, this product The control accuracy is slightly higher than that of pneumatic actuators. (4) If equipped with a servo amplifier, the positive and negative effects can be exchanged easily, and the signal valve position status can be easily set. If there is a failure, it must stay in the original position. This ability is the result of pneumatic actuator products. It cannot be achieved because the pneumatic actuator must be equipped with a combined protection system to achieve the function of retaining position. Disadvantages: (1) Only suitable for places with low explosion-proof requirements and lack of air source. The structure is relatively complex, the thrust is small, and the average failure rate is higher than that of the pneumatic actuator. Due to the complexity of the structure, the technical requirements for on-site maintenance personnel are relatively high. (2) The operation of the motor will generate heat. If the adjustment frequency is high, it will easily cause the motor to overheat and increase the wear of the reduction gear. (3) There is also a slower operation. It often takes more time from the output signal of the regulator to the movement of the regulating valve to the specified position in response. The above is the place where the performance is insufficient compared with the pneumatic or hydraulic actuator. Advantages of pneumatic actuator: (1) Using air as the working medium, it is easier to obtain the working medium, and the used air is discharged into the atmosphere, which is convenient to handle. Compared with hydraulic transmission, there is no need to set up a recovery tank and pipeline. (2) Because the viscosity of air is very small (about one ten thousandth of the dynamic viscosity of hydraulic oil), its loss is also very small, so it is convenient for centralized air supply and long-distance transportation. External leakage will not pollute the environment as seriously as hydraulic transmission. (3) Compared with hydraulic transmission, pneumatic transmission has quick action, quick response, simple maintenance, clean working medium, and no problems such as medium deterioration. (4) Good working environment adaptability, especially in the harsh working environment such as flammable, explosive, dusty, strong magnetism, radiation, vibration, etc., superior to hydraulic, electronic and electrical control. (5) Low cost, automatic overload protection. Disadvantages: (1) Due to the compressibility of air, the stability of working speed is slightly worse. But the gas-liquid linkage device will get a more satisfactory effect. (2) Due to the low working pressure (usually 0.31.0MPa) and the structure size should not be too large, the total output force should not be greater than 10-40kN. (3) The noise is large, and a muffler should be added when exhausting at high speed. (4) The transmission speed of gas signals in pneumatic devices is slower than the speed of electrons and light within the speed of sound. Therefore, pneumatic control systems are not suitable for complex circuits with too many components. Hydraulic actuator The hydraulic actuator is a mechanism that uses hydraulic oil as the power source to complete the predetermined motion requirements and realize various mechanism functions. Advantages: (1) Under the condition of the same output power, the structure is compact, small in size, light in weight and small in inertia. (2) The work is stable, the impact, vibration and noise are small, and it is easy to realize frequent starting and reversing, and it can complete rotating motion and various reciprocating motions. (3) Simple operation, convenient speed regulation, and can realize stepless speed regulation in a large range, with a speed regulation ratio of up to 5000. (4) It can realize low-speed and high-torque transmission without a reduction gear. Disadvantages: (1) The viscosity of the oil is greatly affected by temperature changes, and it is not suitable for use in low temperature and high temperature environments. (2) The processing and matching of hydraulic components require high precision, difficult processing techniques and high costs.
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