Stepper motors

Questions/answers/discussion about initial setup of your CNC Shark

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Schutzhund Shane
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Joined: Fri Aug 07, 2020 12:15 am

Stepper motors

Post by Schutzhund Shane »

Can shark HD motors be replaced by another stepper motor
as long as the 1.8A/phase and the step angle are maintained? I’ve read that 1.8A/phase and a 1.8 step angle is what comes on all shark HDs. Thank you for any information anyone can provide.

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Kayvon
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Re: Stepper motors

Post by Kayvon »

They can be replaced by another stepper that matches the spec, but unless it's already broken you probably won't see any benefit.

The amp rating signifies the maximum current permitted. The electronics control how much current actually passes through, so unless you're replacing the electronics also, you'll still see the same strength.

Rando
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Re: Stepper motors

Post by Rando »

...and since ALL the electronics dump the powersupply through a MOSFET into the motor coils, although you can adjust the tiny trimmer pot on the driver board to get a little bit more current, IIRC it only goes to 2.5A. But, if you really want a LOT more torque, you're going to have to go with a higher-voltage (and higher current / wattage) power supply. The sharks use a 24V one now, so a 30, 32 or even 40V supply would be needed to get significantly (e.g., >50%) more drive current. Which the driver boards may or may not take. But then you'll be dumping more heat into the stepper than normal, so you'd probably go with a higher-torque motor. Unfortunately, it would then tear through the leadscrew anti-backlash nuts, because most systems these days use a ballscrew instead. The thing is, it's a system. Changing one thing often just shifts the strain/stress/deflection to a different part of the system. You increase the motor torque and that bends the HDPE more than normal,.....

I have a design pending that will use the same motors with stronger drivers, like these from eBay:

https://www.ebay.com/itm/4-5A-TB6600-TB ... 4624547223

Those will take the (somewhat) higher voltages and somewhat larger drive current. I'll take the enable, step pulse and direction control lines from the shark's controller board, give the stepper drivers their own power supply, and it should be good to go. Just make sure the interface between the shark controller and the stepper driver inputs are opto-isolated.

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