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작성자북한산산악회 조회 11회 작성일 2021-10-26 11:56:01 댓글 0

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What is a Soft Starter? (For Absolute Beginners)

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In this video, we are going to discuss the “Soft Starter” method amongst all other motor starting methods and we will cover the rest of methods in future videos.

Since Electric Motors often require large amounts of electricity during their accelerating to the nominal speed, a Soft Starter can be used to limit the surge of current known as “inrush current” and torque of the electric motors, resulting in a safer, smoother and gradual start-up.

Soft starters will protect your electric motor from possible damage and at the same time extend the lifespan of your electric motor and the whole system by declining the heating caused by frequent start/stops, reducing the mechanical stress on the motor, its shaft, and reducing the electrodynamic stresses on the power cables.

One example of this is an Air Scrubber or Dust Collector.
These will have large fans inside.

In this application, it will take some time to get the fan moving but once the fan is moving the current and torque load on the motor is reduced.

In the system, the fan will pull air into filters where dust particles are collected. Then the clean air is pushed back to the factory.

Water supply applications are another great use for soft starters.
When using pumps in a process you have to bring them up slowly. If not you will cause pressure surges in the water system that could lead to dangerous conditions.

The soft starter can be controlled either by a direct start/stop wiring or, it can be controlled over ethernet. Both control methods have their advantages and disadvantages.

Direct start/stop signals would not require a PLC. They would be less expensive. Using ethernet control, a PLC is required.

This will allow there to be feedback, which will give adjustable control and monitoring capabilities.

The main component of a soft starter is a Triac which is designed to limit the applied voltage to the motor.

Triac consists of two back-to-back Thyristors or SCRs. When an internal pulse is applied to its gate it allows current to flow which then sends current out to our motor.

The pulses are sent based on ramp time so the current will be slowly applied to the motor. This will allow our motor to start slowly reducing torque and inrush current.

When the motor reaches full speed the soft starter and DOL work the same. The difference is how they act while getting to full speed.

When comparing the voltage between a DOL starter versus a Soft Starter, we can see that there is a direct in rush of voltage on the DOL where the Soft Starter takes more time to get up to full voltage.

The current is more regulated using a soft starter. With a DOL there will be larger spikes in current as the motor starts.

With a soft starter, the time the motor gets us to speed is slower and more controlled.

Our Air Scrubber fan will be driven by a motor using belts and pulleys. Using a DOL can cause the belts to slip and wear.

With our water supply example, the DOL will cause pressure surges on the water lines. This can cause excessive wear which could lead to line breaks.

There are also electrical effects that we want to avoid by using a soft starter. The heavy current surges that a DOL can cause, can burn out contacts and motors.

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#RealPars #SoftStarter #VFD
Auctor137 : Can you do an advanced video where you explain the function in more details with the correct formulars ? And you didn't mention another big problem when starting big (medium voltage) motors direct on line: The huge voltage drop which occurs due to the high starting current of 6-7 times nominal current. This is often not accepted by the power supplier company and therefore you have to reduce starting current with, for example, a stoft starter.
Lt Dan : I'm planning a whole house backup generator which includes running my 3 ton Air Conditioner. The problem WAS my AC was blowing my budget because it would require an 8000 watt minimum generator to handle the initial startup of the unit. I found this soft starter and installed it on my AC (took about 10min.) and now I can run my entire house on a 3500 watt generator. Saved me $$
Edfrank Silva : Muito bom o vídeo Se fosse legendado seria excelente para os surdos
Muhammad ElRawass : It is a professional explaining and clearly. Thank you very much for your efforts
naman goku : This Team makes automation faster and easier than i ever thought possible!

[기본기][유도전동기 24강] 소프트 스타터(Soft starter)를 이용한 기동

* [전기기술사 시리즈]강좌를 "애듀캐스트(https://educast.com)"에서 진행하고 있습니다.
관심있는 분은 "애듀캐스트"에서 제 이름으로 검색하시면 지금까지 올린 강좌가 나옵니다.

* 강의자료는 아래 링크의 카페 자료실에서 다운로드 받으세요.
 네이버 카페: https://cafe.naver.com/eecampus
 다음 카페: http://cafe.daum.net/lecfile
이정섭 : 앞 강의에서 변압기 1차 2차 전류는 본질적으로 180 차이 나는데
변류기 극성점 을 1차 2차 전부 왼쪽으로 놓으면 동상으로 나온다고 했는데
비율차동계전기에서는 2차측 변류기 극성을 바꿔 180도 트는 이유가
뭔가요?
노세운 : 좋은 강의 감사합니다.
이진규 : 에이쿠 ~~~, 명쾌한 설명을 해주셔서 대단히 고맙습니다. 많이 도움이 되었읍니다.
TheSKWAT : 박권배 기술사님, 늘 감사합니다!
Choonsik Lee : 소프트스타터 잘 배웠습니다. 감사합니다.

소프트 스타트 회로 설계 - TL494를 활용한 벅 컨버터 회로 : 돌입전류를 억제하기 위한 Soft Start Circuit

TL494의 4번핀을 활용하면 손쉽게 소프트 스타트 회로를 구현할 수 있습니다. 다만 소프트 스타트와 내부 회로 동작에 대한 이해가 선행되어야, 필요에 맞게 회로를 구성할 수 있습니다. 이번 영상에서는 소프트 스타트가 무엇이며 어떠한 원리로 작동하는지 소개해드립니다.

# 이메일 : ludvik-lab@naver.com
# 네이버 블로그 : https://bit.ly/2KbOClp​​​​
# 네이버 카페 : https://bit.ly/3qLqZRc
# 스토어 : https://bit.ly/3qO1xuP

#소프트스타트회로 #TL494 #벅컨버터
재영 : 파형 너무 궁금하네요 ^^ 좋은 영상 꾸준히 보고있습니다. 감사합니다.
이조사 : 이런 전문적인 영상까지 정말 대단하시단 말 밖에 안나오네요
고강열 : 항상좋은 정보 감사드립니다~~~~
루드비크 전원회로 설계 연구소 : 감사합니다~ ^^
루드비크 전원회로 설계 연구소 : 과찬이십니다. 말씀 감사합니다 ^^

... 

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