Help, Power supply for Stepper recommendation

Using Arduino Motors, Mechanics, Power and CNC
1

Hey Guys,
I bought this combo below and i'm wondering if I can use a smaller power supply to run this motor? This one is huge and heavy. Motor will only be running in short bursts and maybe at 30%power to turn a 14" turntable with minimum load

Power Supply
STP-PWR-4810
SureStep linear power supply, 48 VDC at 10A unregulated, 5 VDC at 0.5A regulated output, 10A, 480W, 120/240 VAC nominal input, switch selectable, 1-phase, anodized aluminum open frame, wall mount, screw terminals.

Motor
STP-MTRH-34127
SureStep stepper motor, NEMA 34 frame, IP40, single shaft, 6.3A, 1288 oz-in holding torque, 1.8-degree step angle, 200 steps per revolution, bipolar.

Driver
Leadshine DC advanced microstepping stepper drive, 7A per phase, 2-phase output, 24-70 VDC, bipolar, velocity and position mode, 200 to 12800 steps per revolution.

2

Stepper motors always run in short bursts, one step. And your controller holds the motor position, so the same power is used all the time.

If you want a smaller, lighter psu, get a switching power supply with similar output ratings.

Paul

3

How much motor torque is required to start the turntable and accelerate it up to final speed?

4

JCA34F:
How much motor torque is required to start the turntable and accelerate it up to final speed?

Not sure, I am just going to wing it I guess.

5

That motor is 0.49 ohm, 6.3A, so the winding dissipation is about 20W. When moving under load
there will be power used to provide the motion too, but you'll probably be fine with 50W supply for
non-taxing use of the motor and an efficient motor driver. 100W would guarantee it, ie 48V 2A.

There's a general rule of thumb saying power supply current is about 1/3rd of motor current (assuming
a reasonably high supply voltage). This agrees with the 2A value. With 1A the motor will work,
but the top speed/torque may be compromized.

If you don't need high speeds 48V is unnecessarily high.

6

MarkT:
That motor is 0.49 ohm, 6.3A, so the winding dissipation is about 20W. When moving under load
there will be power used to provide the motion too, but you'll probably be fine with 50W supply for
non-taxing use of the motor and an efficient motor driver. 100W would guarantee it, ie 48V 2A.

There's a general rule of thumb saying power supply current is about 1/3rd of motor current (assuming
a reasonably high supply voltage). This agrees with the 2A value. With 1A the motor will work,
but the top speed/torque may be compromized.

If you don't need high speeds 48V is unnecessarily high.

Thank you, that helps. I bought the big motor just to have enough torque but really it may spin up to 1000 rpm for just 5-10 seconds then stop for a 5 sec, then repeat.

If not 48V how low can I go?

I was thinking a rail mount like this,
https://www.automationdirect.com/adc/shopping/catalog/power_products_(electrical)/dc_power_supplies/stepper_power_supplies/psb48-240s

7

Alas with stepper performance you really need to do testing to see what the limits are, usable torque
depends on several factors such as mechanical and electrical damping that are not easy to predict. Finding
max usable speed and acceleration values is load-dependent too.