Weird noised when trying to increase speed

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animal
Posts: 22
Joined: Sat May 06, 2017 11:03 pm

Weird noised when trying to increase speed

Post by animal » Sat Oct 06, 2018 9:22 pm

hello there finally got my old Maxnc-10 running on a 3.0 shield . I set teh current for 1 amp on the A4988 drivers . am running in full step mode ( no jumpers) when I try to increase the speed , or steps , the steppers make a noise like a video game (pac-man type) do I have the current set too low ? I'm using PacificScienticic Powermax11 Nema23 motors . any ideas
tks
animal

Bertus Kruger
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Re: Weird noised when trying to increase speed

Post by Bertus Kruger » Wed Oct 31, 2018 6:15 pm

Its likely the motor stalled at full step mode.

I would increase the microstepping. Driving NEma23 steppers will be hard for the driver and microstepping will slow it down to deal with extra power needed.

StuartB
Posts: 47
Joined: Wed Jun 07, 2017 2:25 pm

Re: Weird noised when trying to increase speed

Post by StuartB » Wed Oct 31, 2018 6:41 pm

Have a look here:
https://www.pololu.com/product/1182

Especially the part lower down underneath the current limiting video.
It's about different driver chip boards that have different resistor values.
Depending on how old they are.

animal
Posts: 22
Joined: Sat May 06, 2017 11:03 pm

Re: Weird noised when trying to increase speed

Post by animal » Tue Nov 06, 2018 12:48 am

thanks for the input , I'm a bit behind here . I think before I go any furthur I will purchase a real CNC shield from Elecrow & my next question is should I stick with the A4988 or go with the DRV8825 to power my nema 23 steppers? ius one better than the other ?
tks again
animal

StuartB
Posts: 47
Joined: Wed Jun 07, 2017 2:25 pm

Re: Weird noised when trying to increase speed

Post by StuartB » Tue Nov 06, 2018 1:50 am

I would go for the DRV8825. Higher current rating and work with a higher maximum voltage.

It operates from 8.2 V to 45 V and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow (rated for up to 2.2 A per coil with sufficient additional cooling).

The 4988 operates from 8 V to 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient additional cooling).

You could also try the silent stepstick version.
Almost silent motors.
https://www.youtube.com/watch?v=sPvTB3irCxQ

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