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### Author Topic: Stepper Motor Maximum Voltage  (Read 3372 times)

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#### golash

• 81
##### Stepper Motor Maximum Voltage
« on: March 30, 2015, 10:26:45 AM »
Just got a Chinese 4th axis need help to determine the maximum  voltage for this motor.
My cnc has a 72 VDC Power supply I`m hoping I can use it with this small stepper

5.Step-motors: 42 * 48 2-phase 4 wires 1.6A
gear box output shaft diameter: 15mm
speed reducing ratio：50:1 （0.036 degree/step） or 100:1 (0.018 degree/step)

http://www.ebay.com/itm/261448262900?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

#### stirling

• 2,188
• UK
##### Re: Stepper Motor Maximum Voltage
« Reply #1 on: March 30, 2015, 01:31:14 PM »
looks like your max is going to be 53V. Any more will overheat and shorten the life of the motor.

#### JohnHaine

• 340
##### Stepper Motor Maximum Voltage
« Reply #2 on: March 30, 2015, 06:04:07 PM »
I don't think there will be a problem provided that you set the drive current to 1.6 amps or less.  I don't see where Stirling got 53 v from, it's not in the data provided afaics.

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#### garyhlucas

• 658
##### Re: Stepper Motor Maximum Voltage
« Reply #3 on: March 30, 2015, 06:32:35 PM »
A stepper motor is a constant power device. The current the drive provides is what limits the power it produces. As the motor speed increases the back EMF also increases, which reduces the current unless you increase the voltage. So if you don't want the torque to fall off drastically at higher speeds you need a higher voltage drive.

#### golash

• 81
##### Re: Stepper Motor Maximum Voltage
« Reply #4 on: March 30, 2015, 06:37:43 PM »
Hi
So its a bipolar drive I believe.... so is that  1.6 x 2 phases =3.2 amps

#### ger21

• 6,280
##### Re: Stepper Motor Maximum Voltage
« Reply #5 on: March 30, 2015, 06:59:04 PM »
If you look up the number on the motor in the pic on Ebay, you'll find that it has an inductance of 2.8.
http://intec.company.weiku.com/item/42mm-Hybrid-Stepping-motor-10299252.html

According to Gecko, the maximum voltage you should use is 32 x sq. rt. of inductance.
32 x sqrt2.8 = 53 Volts

When the rated current is 1.6 amps, then you set the drive to 1.6 amps.
Gerry

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#### stirling

• 2,188
• UK
##### Re: Stepper Motor Maximum Voltage
« Reply #6 on: March 31, 2015, 04:29:13 AM »
I don't see where Stirling got 53 v from, it's not in the data provided afaics.

It's there, you just have to use ALL the data @golash provided. The label on the motor in one of the ebay pics gives you your google search for the data sheet etc. etc. which is exactly what I did and Gerry has confirmed.

So to drive that motor to max speed and torque you use 1.6A at 53 volts. Any less of either and you're driving the motor under it's potential speed and torque (which is fine if it's enough for your purposes), any more of either and you're abusing the motor.

Hi
So its a bipolar drive I believe.... so is that  1.6 x 2 phases =3.2 amps

No - set your drive to 1.6A
« Last Edit: March 31, 2015, 05:14:11 AM by stirling »