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After the electric actuator has been used for a period of time, sometimes it may be found that the control accuracy of the electric actuator is not as precise as it was at the beginning, so we need to find out the reasons that affect the control accuracy of the electric actuator. The experience of Heli company for many years has summed up some reasons and solutions that affect the control accuracy of electric actuators. Now let's talk about them.
1. The regulating valve oscillates. First, find out the vibration source. For the oscillation caused by the outside, keep the regulating valve away from the vibration source; Eliminate or weaken the oscillation intensity of the vibration source; It is considered appropriate to use methods such as increasing fulcrum to weaken the oscillation of the regulating valve. The oscillation caused by the internal medium flow should try to reduce the resistance of the regulating valve. A bypass pipe can be added under the condition of adjusting things permitted by experience. For the rapid response control system, the spool with special logarithmic properties can be selected. The butterfly valve shall try its best to work within the range of 10~70 ° and avoid the utility force alternating point of the medium quality valve body.
Electric actuator
2. The electric actuator brake does not work. The brake is used to eliminate the influence of the inertia idling of the rotor and output shaft and the forced air moment of the load reaction after the power failure of the electric actuator, so that the output shaft can stop at the corresponding position correctly. If the brake does not work, the braking precision of the electric actuator will be reduced. Because the following points should be done well.
(1) Adjust the braking torque according to the load volume;
(2) The gap between the brake wheel and the brake disc should be properly adjusted;
(3) The brake shoe shall have sufficient friction coefficient, and it is forbidden to drip oil (do not exceed the maximum position of the oil pointer when filling the lubricating oil).
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