快乐十分选5中3有钱吗

Blog Reading
Home » Blog » Variable frequency drive » How to select AC Drives?

How to select AC Drives?

The AC drive should be of equal size to the electric motor or bigger. In some applications requiring high starting torque due to the load characteristics, the AC drives may need to be oversized to suit. You need to be aware of the load characteristics and size the drive accordingly. Even a fan application which can have low starting torque requirements, still requires full power when running at full speed. The only time that ac drive smaller than the motor would be acceptable would be if the electric motor was never going to run at or above base speed for a variable torque load, even then you have to be aware of the run up times and starting torque requirements.

AC Drives has to be selected by current and not power. That should be same but is not always. Immerged pumps for examples are using more current than standard ac motor for same mechanical power. In general current is more less linked to torque. Be aware than bellow 50% of nominal torque/current the AC drives selection can be different.

Some applications such as conveyor belts in mining applications can be kilometers long and require upwards of 30% of full voltage to start. A fan application may require high starting current to overcome inertia, but current can drop once it is moving and running below base speed. The characteristics of the load need to be taken into account when sizing AC drive application.

The definition of the right set depends on three steps one must properly calculate: 1. Kinematics, 2. Dynamics and 3. Inertia balance and power coupling. As it is an iterative process, it is not possible to get the right set until those three calculations have been resolved. For the first one we need to know what are the speed, acceleration and jerk cycles so first limits for gear and motor appear. Then we need to know what the load is and how it behaves. Is it an elevation? Is it a horizontal movement? Combination? Does the load vary? These parameters allow to calculate power and torque. Together with the values of kinematics you can define the gear+motor options, resources to a few. Finally one must check the inertia ratios between the load and the geared motor (taking itself into account to get the right balance, what makes the process iterative). Perhaps you have enough power and speed but the inertia ratios make the variable frequency drive unable to control the load and unable to transmit the power properly. Finally with all parameters fixed, you can even optimize the ser selection by analyzing the set terminally. This makes profit of the part of the cycle the motor is stopped or its load is low. This is why sometimes you can see lower power sets compared to nominal theoretical values (this is engineering). If you need to fit well an application (i.e. You are a machinery builder and need to optimize much to reduce costs), we can perform the consultancy for it.

You may also like:

Noise and sound are a bit tricky to deal with. Generally the noise from the motor fan is "white noise" and not objectionable to the ear, except for large machines that were mentioned or as mentioned below. The ...
For cable lengths up to 100 meters (and motor suitable for inverter applications) it is not necessary a filter; for lengths from 100 to 200 meters, a series reactance can be used; for greater lengths it is ...
My personal preference is for an AC line reactor simply because it does a better job of protecting the variable frequency drive from the line and the line from the drive. I've always viewed a DC bus reactor on ...
We know that the phase sequence is one of many conditions of the synchronization operation, and made in the beginning of construction. But if for any reason we need to check the phase sequence for two ...
Storage battery is an important component of UPS system. Choosing battery is not only related to the cost of the manufacturers, but also affecting the reliability of continuous power supply of UPS power. ...
service The engineers in AC Drive China are very professional in Chinese automation industrial control fields, provide you comprehensive energy saving solutions.

Hot Tags

Featured

Frequency directly represents no of rotation of rotor for that machine, the higher the frequency the more the rotation of the rotor, i.e. the rpm of the motor there by result ... Due to power electronics technology and microelectronics technology rapid development, variable frequency drive reforms and upgrades speed also is faster, introduce new products, ... Since the 21st century, China variable frequency drive industry is highly fission. Many foreign brands begin to set up factories in China, the implementation of the localization ... My personal preference is for an AC line reactor simply because it does a better job of protecting the variable frequency drive from the line and the line from the drive. I've ... As nowadays there is a trend in green energy production and energy efficiency, what solutions/applications would you recommend in reduction consumed energy of a motor driven by ...

What's New

怎么举报网络彩票 手机竞彩足球在哪里买 手机棋牌输了几百万 快乐棋牌游戏 我爱彩票邀请码是多少 怎么购买手机赌博软件 手机棋牌输钱追回 怎么下载波克棋牌 我要看福建体彩三十一选七走势图 怎么样进入赌单双软件