NEMA23 & TB6560 getting warm

Other Hardware Motors, Mechanics, Power and CNC
1

Hi

I plan to use NEMA 23 with TB-6560 controller in one of my project.
I have tested it successfully with AccelStepper library.

What I am concerned about is that with operation of only 2-3 minutes, the heatsink of TB-6560 and the body of motor got quite warm. Even the jumper wires connecting the coils of the motor got hot enough to deform the molded pins at their ends. Is it normal?

For heatsink, I can use cooling fan.
For coil connections, more better wires can be used.
But what to do with the motor?

Motor is SANYO 103H7126-XXXX, 2.7A
Power: 19.5V from bench power supply (I plan to use laptop supply 19.5V 4.6A for completed project).

2

It is normal for a stepper motor and a stepper motor driver to be hot - uncomfortable to touch.

I assume you have correctly set the current limit on your stepper driver.

...R
Stepper Motor Basics
Simple Stepper Code

3

Robin2:
It is normal for a stepper motor and a stepper motor driver to be hot - uncomfortable to touch.

I assume you have correctly set the current limit on your stepper driver.

...R
Stepper Motor Basics
Simple Stepper Code

Okay, but should they get hot within 2-3 minutes?

Yes, TB-6560

SW1 = 1
SW2 = 1
SW3 = 0
SW4 = 0

which corresponds to 2.6A

4

abuhafss:
Okay, but should they get hot within 2-3 minutes?

If they did it would not worry me.

What would worry me is if the temperature keeps on rising - but with correct current limit set that should not happen.

...R

5

Robin2:
but with correct current limit set that should not happen.

...R

In simple words, they should not get that much warm in 2-3 minutes......CORRECT?

OR you mean, if correct current settings are selected the temperature would not keep on rising?

6

abuhafss:
In simple words, they should not get that much warm in 2-3 minutes......CORRECT?

No that is not what i meant. If they get hot quickly it does not matter.

OR you mean, if correct current settings are selected the temperature would not keep on rising?

Yes. But keep in mind that it may get to a high temperature before it levels off.

...R

7

Robin2:
Yes. But keep in mind that it may get to a high temperature before it levels off.

...R

Would it be good if I use liquid cooling pads on the stepper and TB-6560 with small radiator and a fan?

8

abuhafss:
Would it be good if I use liquid cooling pads on the stepper and TB-6560 with small radiator and a fan?

If the devices are operating at temperatures that are within their specifications then IMHO additional cooling is unnecessary.

Have you got a thermocouple or equivalent that can measure the temperatures? I have a cheap multimeter that has a thermocouple attachment which is very useful for this sort of thing.

...R

9

abuhafss:
Okay, but should they get hot within 2-3 minutes?

Yes, TB-6560

SW1 = 1
SW2 = 1
SW3 = 0
SW4 = 0

which corresponds to 2.6A

Steppers are usually spec'd for something like 60C temp rise or similar.

The TB-6560 chip wastes huge amounts of heat compared to a discrete MOSFET stepper driver
design, but it is cheaper... Personally for really high current steppers its best to give up on
single-chip drivers, they have about the same resistance as the motor windings themselves
so you double your power requirements!

The best single-chip drivers have about 0.25 ohms on-resistance per MOSFET, discrete MOSFETs
can be 0.002 ohms, 2 orders of magnitude better!