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31st Jul 2018, 04:10 PM #16Member
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The people I bought the drill from told me it worked, but I they never turned it on.
The entire stator can be removed from the casting by loosening two grub screws.
the rotor spins freely withing the stator.
The resistance readings from the multi meter all came up with 17.4 ohms between the coils.
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31st Jul 2018, 04:36 PM #17Member: Blue and white apron brigade
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- Feb 2006
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- Perth
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Each coil (1, 2, 3) has two ends (A and B)
In Y connection all the B's are connected forming the common point - the Phases are then connected to the A's in any order.
In the ∆ connection 1B is connected to 2A, 2B to 3A, and 3B to 1A.
If a consistence is not maintained so that an A and B are mixed up on one coil this will cause the problems you describe.
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2nd Aug 2018, 05:11 PM #18Member
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2nd Aug 2018, 06:55 PM #19Member: Blue and white apron brigade
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All you are doing there is switching the phases which won't make any difference
When I turn up the VFD, it makes this sort of accelerating sound but nothing turns.
Because I don't know what sort of VFD you have I can only say that the following is safe with a Powtran.
It assumes the max frequency is 50Hz and the current max has been set in the VFD to suit the motor
With a Powtran, with the power off, turn the VFD up to max Frequency.
Set the acceleration time to 3s and push start/fwd and let the VFD take care of it - if it overloads the VFD will not start and will not damage anything.
On other VFDs they usually report a error.
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2nd Aug 2018, 07:37 PM #20Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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- 838
OK, a couple more questions, what size motor are you trying to drive with the 1.5kw VFD?
Have you tried to start the motor with the gearbox in the neutral position?
What make is the machine, can you post a photo of it?
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2nd Aug 2018, 08:46 PM #21Member
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- Apr 2018
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- Sydney
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Ok, I turned off the VFD and turned the pot to 60Hz position. I turned it back on and started the motor but it still just makes that buzzing noise and wont turn (it cannot be moved the slightest bit when the VFD is powering the motor (not safe I know).
How is acceleration generally set on a VFD (how is the option accessed)?
I know it most likely won't be the same as your VFD, but sometimes Chinese knockoffs are really similar.
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2nd Aug 2018, 08:48 PM #22Member
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- Apr 2018
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- Sydney
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- 64
Im19531128ML-Grimston.jpg
I will take some pictures of the actuall machine tomorrow. I managed to find an advertisement from the 1950's of the machine. I have removed the gearbox completely.
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2nd Aug 2018, 09:29 PM #23Senior Member
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- Oct 2015
- Location
- melbourne
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- 473
What do you mean here? Do you mean lying the motor on one side then 'turning it over'? What happens if the motor is vertical.
I'm wondering if the motor is 'poling' - worn bearings letting the rotor touch the stator. With power applied you get attraction, touching and then locking.
Russ
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2nd Aug 2018, 09:57 PM #24Member
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- Apr 2018
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- Sydney
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- 64
The motor assembly is mounted into the drill casting. It is in a vertical position, when there is no power applied to the motor, it rotates freely with and without the gearbox.
I will take apart the assembly and take pictures tomorrow.
I am starting to think that it may be locking due to the rotor and stator touching like you mentioned as I noticed there is a moment when the rotor turns about 60 degrees and halts.
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4th Aug 2018, 04:29 PM #25Member
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- Apr 2018
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- Sydney
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- 64
Problem solved!
It was the rotor all along.
I put the rotor into my lathe and turned down the surface just enough to remove any minute inconsistencies (dings, etc).
Now the motor fires up as it should.
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