×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*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.

Students Click Here

Jobs

High speed grinding spindle motor connections

High speed grinding spindle motor connections

High speed grinding spindle motor connections

(OP)
I am having difficulty in working out how to connect the grinding wheel motor in a late 1940's Black and Decker Valve Resurfacer. (B & D have no longer any drawings for this machine and were unable to help).

I was given this machine in totally dismantled condition. The 240 volt ac motor that drives the 5 inch grinding wheel has an armature with 21 poles, and there are 63 segments on the commutator.
It has three carbon brushes disposed at 90 degrees to one another around one half of the commutator, one brush holder remains connected to one end of the field winding. There are two copper wound chokes and the remains of a capacitor, but no interconnecting wiring. I recognise the chokes and capacitor(s?) are for altering the phase angles, but cannot fathom how to connect them ... none of my books deal with such a configuration.
I imagine the motor would drive the grinding wheel at around 4000rpm

Can anyone give me some direction as to how to connect the brushes and field winding via chokes and capacitors ... or perhaps direct me to a book which covers this type of machine?

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.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources