A(nother) motor question

Other Hardware Robotics
1

Good morning,

I’m working on a motion platform using 3 stepper motors (choice of steppers vs servos because of the way my calculations are done in the program)

I made a C# program to get data from simulators to communicate with an Arduino program.

Using an arduino UNO (for now) I have a miniature prototype which is very basic but it works.

At the moment I’m still in the stage of doing all the calculations based on 3D models and estimates of weights.

As a result, I’ve gathered that in the most straining situation, the motors need to be able to handle a peak of 108 Nm.

I understand that this is a huge amount of torque and potentially dangerous.

Looking at options I’m leaning towards getting a 12nm stepper with a 10:1 gearbox to achieve the holding torque of 110Nm ( assuming a buffer of 10NM torque loss as I'm not expecting the full 12Nm on the motor)

Powerplant-wise, I was looking at several options:

OPTION 1

https://nl.aliexpress.com/item/4000175758639.html?gatewayAdapt=glo2nld&spm=a2g0o.detail.1000060.1.545e728bKzZjH9&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.169870.0&scm_id=1007.13339.169870.0&scm-url=1007.13339.169870.0&pvid=93db46f4-3306-4882-aa31-95d55b4337ab&_t=gp

Where I live, net voltage is 230V, the mentioned power supply however shows 220V.
Can I still use this power supply or should I look elsewhere?

OPTION2

and then I would go for this power supply:

This one is rated for a max of 250V input.

Questions:

  • The power supply is rated for several output voltages, do I assume that the voltage drop from the motors is the one stated on the ‘rated current’ (ie: 3v for the 12NM motor) and then wire the motors up in series as to get the required voltage?

-Do I understand correctly:

° 12V 90A 960W powers supply

° 3 12Nm motors, rated voltage/current 3V/6A

-->Too much voltage from power supply, or is it allowed to be more ?

--> current gets drawn with increased workload, so Amps will vary but sufficient from power supply?

  • What would be the best approach to get a good estimate of the Wattage required?

I understand that watt = amps x volts.

So if I just take the voltage of the motors and multiply it by the amps I get the required wattage, or is this too simplistic?

OPTION 3

this package shows power supplies with an output of 60V DC 6.7A and the drivers can take an input of 24V-110V DC.

Looking at the 12Nm motor, it shows rated current of 6.2A. With the power supply rated at 6.7A, is this enough or do I need to aim at more margin?

Lastly, I understand this is quite alot of electrical power, I'm also looking at ways to protect from overcurrent/voltage and I'm looking for pointers as to how I'd best approach this.

thank you.

Krgds,

Quinten

2

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