I recently acquired a workshop dust extractor. In bits because the waste
had clogged the fan and burned out the motor capacitor (single phase
2.2kW) I have no means of checking for shorted turns but the winding
resistance values look OK (1.6 and 4.0 Ohms ) and it does not appear to
fault to the frame.

Very much a dead parrot moment except there is no means of guessing the
original rating.

ISTR a thread on this subject and will look when I have more time.
However, it occurred to me that someone might have a similar unit and
could look up the values for me.

Alternatively given that this is a large diameter steel! fan is it
possible to determine the rating by any other means?

regards
--
Tim Lamb

In article ,
Tim Lamb writes:
I recently acquired a workshop dust extractor. In bits because the waste
had clogged the fan and burned out the motor capacitor (single phase
2.2kW) I have no means of checking for shorted turns but the winding
resistance values look OK (1.6 and 4.0 Ohms ) and it does not appear to
fault to the frame.

I doubt that caused the capacitor to burn out. It was
probably going to burn out anyway.

Very much a dead parrot moment except there is no means of guessing the
original rating.

Normally doesn't matter very much -- mainly affects the
starting torque, and a fan probably doesn't have much
initial resistance.

ISTR a thread on this subject and will look when I have more time.
However, it occurred to me that someone might have a similar unit and
could look up the values for me.

Alternatively given that this is a large diameter steel! fan is it
possible to determine the rating by any other means?

Is it not written on the rating plate?
What is written on the rating plate?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

In message , Andrew Gabriel
writes
In article ,
Tim Lamb writes:
I recently acquired a workshop dust extractor. In bits because the waste
had clogged the fan and burned out the motor capacitor (single phase
2.2kW) I have no means of checking for shorted turns but the winding
resistance values look OK (1.6 and 4.0 Ohms ) and it does not appear to
fault to the frame.

I doubt that caused the capacitor to burn out. It was
probably going to burn out anyway.

Very much a dead parrot moment except there is no means of guessing the
original rating.

Normally doesn't matter very much -- mainly affects the
starting torque, and a fan probably doesn't have much
initial resistance.

No but there is a lot of inertia in such a heavy fan.

Is it not written on the rating plate?
What is written on the rating plate?

Power 2200W phase 1

Volt 230V HZ 50

Amp 9.6A Class B

RPM 2950 SER


All fairly self explicit except *SER*. I tried spinning the motor
with string wound round the shaft (might have the direction wrong) and
could not hear any centrifugal switch clicks.

There are no access plates and I don't want to draw the end covers off
unnecessarily.

Perhaps the first move is to borrow a capacitor from another motor and
try livening it up on no load. If the supply trips out I can show it to
my local rewind firm and then decide.

regards


--
Tim Lamb

Tim Lamb wrote:
Is it not written on the rating plate?
What is written on the rating plate?


Power 2200W phase 1

Volt 230V HZ 50

Amp 9.6A Class B

RPM 2950 SER


All fairly self explicit except *SER*. snip

I would think this is short for serial number - probably worn off by now
or stamped but not deep enough to read.

--
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