×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# design for contactor

## design for contactor

(OP)
helo,
now i got 1 project about design the  electromagnetic contactor.
The core of the contactor is silicon steel.
the shape of the cores are U shape n l shape.In the U shape core,the horizontal part is bigger than vertical part.The area of the horizontal part is (0.015m*0.015m) n the area of the vertical parts is (0.014m*0.014m).The ai gap between the cores is 0.0013m.
The  coils is round on the horizontal part.
1)How i can find the number of the turn(N) for the coil?
2)the current(I) required?
The information given:
The force required is 58.9N to connect the two cores.
When voltage is 154V(70% of 220V),the cores must b connect.
when voltage drop to 66V(30% of 220V),the cores non-connect.
3)what is the force,when the voltage is 66V?

Actually,i had tried to find it b4.but the turn is to big.
When i fix the I =0.5A, the turn is 18000
(the current may b can assume ourself,it arround 0.3A to 0.9A).
Is it we need to find the resistance(R) 1st to find the N ?or we assume the R ourself too?

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!