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24th May 2019, 03:50 AM #1Golden Member
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Dahlander wound motor reconfiguration
I have a 3 phase 415V Dahlander wound motor 2 speed constant torque motor. When in 4 pole configuration the windings are arranged delta with 2 windings in series between each phase. When in 2 pole configuration the windings are arranged into parallel stars with the centre points connected.
My plan is to reconfigure the windings to give me a delta arrangement such that between each phase there are two parallel windings. This should give me a 2 pole 240v three phase motor.
Unfortunately the ends of all the windings haven't been brought out to the connection box. I am wondering if anybody has had a look inside a Dahlander wound motor recently and can tell me if the ends of windings generally easy to get at?
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24th May 2019, 08:31 AM #2Member: Blue and white apron brigade
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I've done a few - it gets tricky as there are MNAY connections inside these motors so you have to be, comfortable with breaking a remaking more junctions than usual, and handy with a multimeter.
Here's a thread about a couple of such motors, WIring arrangements on a ∆∆/Y motor and it also shows what coil configurations/arrangements work and those that don't.
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24th May 2019, 01:32 PM #3Golden Member
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BobL I was hoping you would respond. Looks like you have already done what I intend to do with the parallel delta mode. I intend sometimes operating at 25hz so that vibration you got at that speed is a little concerning. It must be electrically induced or you would have noticed it previously.
I will let you know how I go.
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24th May 2019, 05:35 PM #4Member: Blue and white apron brigade
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