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28th March 2021, 08:43 PM #1SENIOR MEMBER
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changing the motor on the extractor
I have a bag house extractor. The motor is 4kw, the fan is roughly 500mm dia.
photo 3.jpgphoto 2.jpg
I am wondering, by changing the motor to 7.5kw, will this increase the performance of the extractor?
1.JPG
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28th March 2021 08:43 PM # ADSGoogle Adsense Advertisement
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28th March 2021, 08:47 PM #2Senior Member
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It won’t if the motor spins at the same rpm, check the motor label.
cheers
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28th March 2021, 10:27 PM #3.
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To increase flow you'll need to spin the impeller faster.
The easiest way this can be dome is using a VFD.
If your 4kW motor is already near its max current draw, running it at a higher speed may result in the motor drawing too much current.
If the DC was only used intermittently ie 30s at a time, that might be OK but any longer will in the long run probably cause motor failure.
Going to a bigger motor that can handle higher currents is where a more powerful motor makes sense.
My DC had a 3HP Single Phase motor (SP) and I wanted more speed so I replaced the SP motor with a 3P motor and a VFD.
The current draw was fine 50Hz (9.4A) but at 60Hz the current draw was 13.7A this cause the motor to get too hot after about 5 minutes of use.
I then switched to a 4HP (3kW) motor and it can run all day at 13.7A.
If your current motor is RUNNING nowhere near its rated current you may not need to change the motor when a VFD is added.
NB spinning impeller faster will also make a LOT more noise.
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29th March 2021, 04:23 AM #4SENIOR MEMBER
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That impeller looks fairly rustic to my eye, you might get better airflow if you can find a more modern design impeller that fits. Finding something that fits is going to be the tricky bit though.
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29th March 2021, 08:53 AM #5.
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29th March 2021, 09:56 AM #6GOLD MEMBER
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Pretty rustic looking though with it being welded up from angle iron and flat pieces added to the outer tips with more welding. Upside is that it is a backward inclined impeller.
Pete
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29th March 2021, 07:44 PM #7SENIOR MEMBER
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