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Typically I use three phase 220 VAC motors and a solid state phase inverter to convert the single phase 220 to three phase and to regulate shaft speed. Recently I built a new "portable" polishing table using a 24 DC volt motor and 20 -1 combined gear box.
I built a new enclosure with the idea of lowering the natural frequency as well as damping the panels from being sounding boards.
It's proving be more of a problem isolating the motor than I thought and I've come to wonder if perhaps instead of addressing the symptoms I'd be better off addressing the cause. I've assumed that the PWM power curve is in the form of a square wave and that the noise is from the abrupt amplitude change in the square way profile. Additionally have you checked the battery or input voltage to ensure that it is not sagging during the output pulse (making the problem worse). The only time I have seen this happen is when the DC variable speed controller 'hunts' at low speed causing noticeable large pulses of speed at between 15 to 60 pulses per minute, but again this is more due to a faulty DC variable speed controller.
The power supply that normally powers it is a regulated laboratory unit with five times the amperage capacity.
I'll hook up the motor with the PWM to a pair of 12 volt batteries in series and see if the humming still occurs. Its the mark space ratio which will control the average voltage and therefore the speed of the motor. One great sentence from here helps in your quest further I feel, especially the sentence I have underlined!!

Andy, it may also be sufficient to damage the insulalion on the coils which could cause premature failure. With this combination you can adjust the switching frequency with R4 and the output voltage with VR.
I've not run the unit on batteries but have noticed that when at higher speeds the noise stops. Its been a long time since I worked on inverters (PWM), but as I recall they all Sing at the base frequency. That will usually fix the problem if due to the frequency (or other multiples of) of the PW. Advancements in components for batteries, diodes and LED's, and innovations in consumer and commercial products. When the frequency of the power pulses matches the natural frequency of the enclosure, the noise intensifies considerably to the point of distraction. Is there a different type of DC speed regulator than can accurately control the speed of a 24 volt motor that draws about 7 amps and which doesn't sound like the Mills Brothers?
Since the worm gear gives a 20:1 reduction, this suggests that the armature is operating at a no load speed of 2500 rpm. With a no-load output speed at the gearbox output shaft of 125, that means that an unregulated rpm, at the turntable is 12.5.
It never occurred to me to suspect that the power supply may be causing the noise, not the PWM.

While I have the schematic diagram (see embedded diagram below) I can only find one symbol for a variable resistor in the schematic. I suspect that the second one may regulate amplitude for torque compensation at low speeds but I don't know that.
It is one of two units and both have been tested and run fine of two different power supplies.
It would be embarrassing if it turns out that the noise was from driving the motor improperly. This suggests that an additional, second stage reduction should be added so as to put the motor into a higher operating range.
Power is supplied by an accurate, regulated power supply or, when needed, a pair of 12v dc car batteries in series. I think in the final analysis, I'm better off shelving this PWM and buying one that has a higher frequency.

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30.11.2014 admin

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