It is normal for electric motors to draw a large amount of current every time they start. It’s like pushing a car, you need to exert greater force at first until the wheel rolls with less effort. But with motors, it can cause voltage dips and unexpected effects on the motor itself. So choosing a good starting method to reach a functional and efficient system is very important. Let’s take a look at the following:
Star-delta Starters
Some motors can use the star-delta method in their operation. The first requirement, of course, must be connected in a star configuration. This will help to gather speed without drawing a high starting current. Once it reaches the required speed or what we call “stable speed”, it runs at normal ‘delta’ configuration. This method can help to reduce 1/3 of the usual starting current, but it is only suited for applications where the motor will start when there is no load.Soft Starters
The soft starter is an electronic device used to regulate the motor’s voltage during startup. By slowly ramping up the supply voltage to the motor, a gentle start without too much current flow can be achieved. Soft starters are more expensive compared to star-delta starters, but people prefer them because they are more convenient and easier to use.Variable Speed Drives
The variable speed drive (VSD) is also an electronic device that allows complete control of the motor speed including starting and stopping it. It operates by changing the frequency supplied to the motor. The VSD is extremely versatile and is often used in process applications (e.g. conveyors, pumps, mixers, etc.) where constant pressure must be maintained. In addition, because the motor can be operated at a slower speed and hence use less energy, the use of VSD can actually save power. Variable Speed Drives are the most expensive method for motor starting but its versatility is the reason why it is chosen by companies worldwide.Electric motors draw a large amount of current when starting, similar to pushing a car. You need more force initially until the wheel moves more easily. This high current can cause voltage dips and affect the motor. Thus, choosing an efficient starting method is crucial. Consider these options:
Star-Delta Starters
Star-delta starters are suitable for motors connected in a star configuration. This setup helps the motor reach speed without drawing high starting current. Once it achieves stable speed, it switches to the delta configuration. This method reduces starting current by about one-third but is best for motors starting without a load.Soft Starters
A soft starter regulates the motor’s voltage during startup. It gradually increases the voltage, allowing for a smoother start and lower current flow. Although more costly than star-delta starters, soft starters are preferred for their convenience and ease of use.Variable Speed Drives
Variable speed drives (VSDs) control motor speed by adjusting the frequency of the power supply. They offer full control over starting, stopping, and speed regulation. VSDs are highly versatile, ideal for applications like conveyors and pumps, and can save power by running motors at lower speeds. Despite their high cost, VSDs are favored for their flexibility and efficiency.We design and manufacture high-quality switchboards. Contact us today to discuss your requirements and get started!