Without seeing the motor I can't be sure

Posted by Mark Kelly (M) on September 19, 2006 at 17:11:12

In Reply to: Re: Rek-O-Kut / Papst project starts posted by jweiss on September 19, 2006 at 16:39:21:

Without seeing the motor I can't be sure.

If you have access to a three channel scope it's very easy to check for yourself. Remove the cap so the three supply wires are separate. Attach a resistor to each wire, attach the other ends of the resistors to each other. Value is not critical, 1k is convenient.

Connect the three wires to three channels of the scope with the common point as ground. Run the motor (by hand will do) and check the trace. You should get three evenly spaced sinewaves which form a braided pattern.

If you don't have access to a multichannel scope you can check out each pair of wires in turn on the XY trace of a single channel scope. All three possible pairings should give you the same phase difference which should be 60 degrees (you are checking in delta format so it isn't 120 any longer). This is harder to judge unless you are used to phase angle estimations.

Mark Kelly

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Follow Ups Full Thread

Topic - Rek-O-Kut / Papst project starts - Mark Kelly 22:17:36 09/18/06 (17)

Re: Rek-O-Kut / Papst project starts - jweiss 16:39:21 09/19/06 (1)

Without seeing the motor I can't be sure - Mark Kelly 17:11:12 09/19/06 (0)

Hey Mark! - Mikey 12:40:26 09/19/06 (0)

Correction - Mark Kelly 02:33:54 09/19/06 (1)

Re: Correction - mosin 11:16:10 09/19/06 (0)

Re: Rek-O-Kut / Papst project starts - grinagog 22:31:41 09/18/06 (11)

Re: Rek-O-Kut / Papst project starts - mosin 11:17:45 09/19/06 (3)

Mosin, with a upholstery thread on my N-33H..... - tubesforever 13:35:35 09/19/06 (2)

No Prat, but you like it?(nt) - vinyl-addict 13:56:08 09/19/06 (1)

Less PRAT not NO prat...... - tubesforever 16:11:00 09/19/06 (0)

Not mine - Mark Kelly 23:38:03 09/18/06 (6)

Have you closely inspected that pulley.... - tubesforever 23:58:05 09/18/06 (5)

Definitely machined - Mark Kelly 00:58:39 09/19/06 (4)

Re: Definitely machined - mosin 11:27:52 09/19/06 (1)

If you can deliver a drawing, I will have my brother in law machine some for us! - tubesforever 14:26:42 09/19/06 (0)

Re: ROK and Empire very similar designs - grinagog 01:28:17 09/19/06 (1)

Re: ROK and Empire very similar designs - mosin 11:22:40 09/19/06 (0)

Follow Ups

Without seeing the motor I can't be sure - Mark Kelly 17:11:12 09/19/06 (0)

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