Finding a powersupply for my project

Other Hardware Motors, Mechanics, Power and CNC
1

I am trying to find help in chosing what I need for a power supply to drive the 3 stepper motors and stepper drivers show below. Does this mean I would need a power supply that has three outputs? The ones I am seeing with 3 outputs are way outside of my budget. If I need 3 outputs maybe it would be cheaper if I went with one 2 channel motor driver and one single channel. If you could list a P/N of a powersupply that would work for this project just to get me pointed in the right direction.

Stepper Motor ROB-09238 Nema 17

Step Angle (degrees) :1.8
2 Phase
Rated Voltage : 12V
Rated Current : 0.33A
Holding Torque : 2.3kg*cm
5mm Diameter Drive Shaft
Winding resistance: 32.6 Ω
Winding inductance: 48 mH
Max flux linkage: 1.8 Vs
Maximum Detent Torque: 0.016 N.M
Total inertia (kg.m.m): 3.5 Kg.m.m
Total friction (kg.m/s): 4 Kg.m/s
NEMA 17 Mounting Hole Pattern (31mm)
Motor Width: 42mm (1.67”)

Motor Driver

Toshiba TC78H670FTG Clock-in and Serial controlled Bipolar Stepping Motor Driver
Latch terminals for plug and play access (no soldering required!)
Allows full, half, quarter, 1/8, 1/16, 1/32, 1/64, 1/128 step operation
Power supply operating voltage: 3.6 V to 16.0 V
Output current ratings: 2.0 A (max)

2

No you just need one 12V supply that can proviede a bit more than 1A for times when all three motors are active..

1 Like
3

I do a lot of projects and I use a Lab Power supply, I can adjust both the voltage and current limits. It has saved me many of times from damaging a module or Arduino. I normally set it for 8.5V and power in via the Vin pin. I have a second for other parts in the design. A 0-15V or greater at maybe 5A would be a great asset to your lab. I would guess maybe in the $50 US at your favorite china supplier depending on features etc.

4

Not a good match.
That stepper driver is wasted on that stepper motor. There is no overhead voltage when that driver and supply are used with a high-impedance (32.6ohm) stepper motor.
You should have used a low impedance stepper motor with that driver and supply.
Leo..

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5

Do you have one you could suggest that would be more suitable?

6

With those high impedance, low current steppers, even the ancient L298 brushed DC motor driver will work well with a 12V supply.

You do not need a current limiting stepper driver.

7

Motor voltage must be significantly lower than the power supply voltage for a current controlled driver to work. If you have a 12volt supply, then rated motor voltage shouldn't be much higher than 3volt. You have a 2Amp driver, so you can use a motor up to that current.
Here's a 400-step example (more steps, lower speed).
200-step motors are more common.
Leo..

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