PWM motor noise
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PWM motor noise

 
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Bart
Guest
Posted: Thu Nov 17, 2005 9:35 am    Post subject: PWM motor noise Reply with quote
Hi all,
bought a PWM kit ( http://kitsrus.com/pdf/k67v3.pdf ), but put in an
IRF840 & a 630V .1uF cap to run a 108VDC (nom) motor with
rectified/filtered line voltage (~160VDC).
The motor makes a rather loud (pwm) noise when running, is this
normal?
Any way of quieting it down?
Yes, I know I shouldn't be rectifying mains, but this is a test & I'll
use a stepdown/ isolation Xformer if & when it's working well.
TIA!
Bart

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phatty mo
Guest
Posted: Sun Nov 20, 2005 5:35 pm    Post subject: Re: PWM motor noise Reply with quote
Bart wrote:
Quote:
Hi all,
bought a PWM kit ( http://kitsrus.com/pdf/k67v3.pdf ), but put in an
IRF840 & a 630V .1uF cap to run a 108VDC (nom) motor with
rectified/filtered line voltage (~160VDC).
The motor makes a rather loud (pwm) noise when running, is this
normal?
Any way of quieting it down?
Yes, I know I shouldn't be rectifying mains, but this is a test & I'll
use a stepdown/ isolation Xformer if & when it's working well.
TIA!
Bart

High pitched at low speeds,and it gradually gets higher pitched at
faster speeds? Pretty normal.
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Jon Elson
Guest
Posted: Thu Nov 24, 2005 1:35 am    Post subject: Re: PWM motor noise Reply with quote
phatty mo wrote:

Quote:
Bart wrote:

Hi all, bought a PWM kit ( http://kitsrus.com/pdf/k67v3.pdf ), but
put in an
IRF840 & a 630V .1uF cap to run a 108VDC (nom) motor with
rectified/filtered line voltage (~160VDC).
The motor makes a rather loud (pwm) noise when running, is this
normal?
Any way of quieting it down?
Yes, I know I shouldn't be rectifying mains, but this is a test & I'll
use a stepdown/ isolation Xformer if & when it's working well.
TIA!
Bart


High pitched at low speeds,and it gradually gets higher pitched at
faster speeds? Pretty normal.

What is the PWM frequency? An IRF840 should be able to
switch well above audible frequencies. You might be able to
turn the PWM frequency up by changing a resistor or capacitor.

Jon

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