外文翻译---电动卷扬机的控制

《外文翻译---电动卷扬机的控制》由会员分享，可在线阅读，更多相关《外文翻译---电动卷扬机的控制（10页珍藏版）》请在毕设资料网上搜索。

1、翻译部分 英文原文 Control of Electric winch For motor control, we know the best way is to use the style buttons to move the many simple manual console. And this console, in some applications may still be a good choice, as some complex control headache can also be used. This article describes in your design,

2、 build or purchase winch controller, you have the motors basic electrical equipment and you will need to address the user interface command addressed. First, the manual should be a manual control console type, so if you remove your finger buttons, hoist will stop. In addition, each control station e

3、quipped with an emergency need to brake, hoist the emergency brake to cut off all power, not just the control circuit. Think about it, if the hoist at the stop, it did not stop, you do need a way to cut off the fault line protection power. Set the table in the control of a key operated switch, is al

4、so a very good idea, especially in the line leading to the workstation can not control, you can use the switch. (in the design of the console, even the simplest manual console, but also consider setting by specialized personnel to operate the safe operation of the keys.) Constant speed motor control

5、 For a fixed speed winch actual control device is a three-phase starter. Turn the motor is reversed, by a simple switch controlled phase transformation sequence from ABC to CBA. These actions are completed by two three-pole contactor-style, and they are interlocked, so that they can not be simultane

6、ously closed. NEC, required in addition to overload and short circuit protection devices. To protect the motor against overload due to mechanical effects caused by overheating in the heat to be installed inside the starter overload delay device.When the heat overload delay device overheating, it has

7、 a long double off the metal motor power. In addition In addition, you can also select a thermistor can be installed in the motor winding way, it can be used to monitor motor temperature changes. For the short-circuit protection, we generally used by motor fuses to achieve. A linear current independ

8、ent contactors, the contactors are configured should be more than the current main circuit contactor, so as to achieve the purpose of redundancy. This sets the current contactor is controlled by the security circuit, such as: emergency brake and the more-way limits. We can use the limit switches to

9、achieve the above operation. When you reach the end of the normal travel limit position, the hoist will stop, and you can only move the winch in the opposite direction (ie, the direction away from the limit position.) There is also need for a more limited way just in case, due to electrical or mecha

10、nical problems, leaving the operation of hoist limit bit more than normal. If you run into more limiter, linear contactor will open, therefore, can not be driven winch will exceed this limit position. If this happens, you need to ask a professional technician to check the lead to meet the more speci

11、fic reasons limiter. Then, you can use the starter toggle switch inside the elastic recovery process to deal with more problems, rather than tripping device or a hand-off the current contacts. A necessary condition for speed Of course, the simple fixed speed starter is replaced by variable speed dri

12、ves. This makes things start to get interesting again! At a minimum, you need to add a speed control dial operation platform. Joystick is a better user interface, because it makes you move parts of a more intuitive control. Unfortunately, you can not just from your local console to send commands to

13、control the old variable speed drives, in addition, you can not want it in the initial stages, will be able to enhance the safe and reliable and decentralized facilities. Most of the variable speed drive can not achieve these requirements, because they are not designed to do upgrading work. Drivers

14、need to be set to release the brake before the motor can generate torque, and when parking, that is, before the revocation of torque, the brake will be the first action. For many years, DC motors and drives provide a number of common solutions, such as when they are in a variety of speeds with good

15、torque characteristics. For most of the hoist of the large demand for DC motor is very expensive, and that the same type of AC motor than the much more expensive. Although the early AC drives are not very useful, as they have a very limited scope of application of the speed, but produced only a smal

16、l low-speed torque. Now, with the DC drives the development of low cost and a large number of available AC motors has led to a communication-driven revolution. Variable speed AC drives in two series. Frequency converter has been widely known and, indeed, easy to use. These drives convert AC into DC,

17、 and then, and then convert it back to exchange, the exchange after the conversion is a different frequency. If the drive produced the exchange of 30Hz, 60Hz a normal motor will run at half speed. Theoretically, this is very good, but in practice, this will have a lot of problems. First of all, a ty

18、pical linear motor 60Hz frequencies below 2Hz 3Hz area or there will be errors, and start cog (that urgent push, yank), or parking. This will limit your speed range lower than 20:1, almost not adapted to the operational phase of the fine adjustment. Second, many low-cost converter is not able to pro

19、vide the rated torque at low speeds. Use of these drives, will result in the rapid move to upgrade the components or complete failure, precisely, when you try to upgrade a stable scientific instruments, you do not want to see this situation. Some new inverter is a closed-loop system (to get feedback

20、 from the motor to provide a more accurate speed control), and the motor will work quite well. Another series of AC drives is the flow vector type drive. These components require installation of the spindle motor encoder, encoder makes use of these drives can accurately monitor the rotation of the m

21、otor armature. Processor accurately measured magnetic flux vector values that are required to make the armature at a given speed rotation. These drives allow infinite speed, so you actually can produce at zero speed to rated torque. These drives provide precise speed and position control, so these d

22、rives in high performance applications to be welcomed. (Based on PLC controllers provide system status and control options. This screen shows the operator full access to the nine-story elevator enhance the control panel.) PLC-based systems Is the full name of a PLC programmable logic controller. First of all, PLC controller developed to replace the fifties and sixties-based industrial control system