Shaker Motor on PWM circuit... how to remove whine / squeal ?

[LTek]

Today I moved my shaker motor from the RigMaster's digital output to a PWM output. On PWM it gives a very loud whine/squeal sound... as the speed increases, the whine decreases.   For the last 11 months it has been connected to digital outputs without any whine or squeal sounds. 

 

I'm using the motor...

https://www.amazon.com/BestTong-Vibration-DOUBLE-HEAD-Electric-Vibrating/dp/B07RL77J2T

Motor specs are: 24v @ 1.15 amps; 12v @ 0.06 amps.

 

I have always had a diode installed across +- terminals, and 1 Amp fuse in RigMaster

 

Anyone have a fix?

 

thx for the help!

[Rappelbox]

In rigmaster and all other kl25z (precisely: Pinscape) based controllers you can add a so called flipper logic.

This feature enables the full power for a certain time and after that it reduces the power that is passed to the toy.

You should set a full power time of at least 50-80msec and after that reduce to your preferred amount, like 30-40%

this way you ensure the shaker starts quick (no more sqealing) and is not moving your vpin through the whole building at the same time

[LTek]

@RappelboxThank you for the quick reply and info. I did try that, it didnt remove the whine sound.

 

but right after I posted, I found an old thread with mod'd KL25Z FW that works -- no more whine or squeal.

 

FW posted here to help others that may have this issue.

 

If only I had found that a year ago! I have been using my shaker on digital (on/off) and missing a lot of shaker goodness.

 

Pinscape_Controller_KL25Z_20230207_20kHz_PWM.zip