3phase servo motors/power supply

[ProEDesigner00]

greetings

I am a mechanical designer and know very little about motor control. I am building a CNC mill. Ebay has an offering of a set of 3 motors with the following description


Servo Type: 3-Phase Brushless AC w/ Absolute Encoder Feedback
Mechanical Output Power: 100 Watts
Feedback 12 bit absolute encoder w/ differential outputs
Maximum Drive Voltage: 200 Volts
Shaft Diameter: 8 mm
Continuous Torque Output: 45.1 oz-in (0.318 Nm)
Continuous Current Input: 0.89 Amps RMS
Rated Speed: 3500 RPM
Brakes: 90 VDC active low brakes
Bolt Hole Circle Diameter: 70 mm

My power in my shop is the standard 1 phase 220v service. will I be able to purchase a controller for these motors that will work with this single phase service?

Thanks in advance

Norb

 

[blacksea]

The servo amp with DC supply (vs AC supply) for such low power motor would be cheaper way. Pay attention than standard motor features are encoder (not absolute) and 24VDC brake - see servo amp from AMC (

http://www.a-m-c.com)

or Elmo (

http://www.elmomc.com).

 

[Skogsgurra]

The answer to your question is YES. Such low powered servos can usually be run off single-phase supplies. The three phases for the motor are created inside the servo, so it doesn't bother if the supply is single phase. It can also be DC, if you have it available.

Gunnar Englund

http://www.gke.org

--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[ProEDesigner00]

HI Guys

Thanks for the confirmation. However maybe these motors aren't as powerful as they should be for my application............if I am calculating this correctly the ft pounds is only 2.819. in my mind this is not much, but I am not certain what reqirements I need to have........ok I will do some investigations.

 

[LionelHutz]

Typically, running small 3-phase motors off a single phase source isn't a problem for the controller.

I did a quick check and converted 0.318Nm into about 0.23lb-ft.

 

[PLClatin]

It seems to be very low power for this application. I understand from your message you want to build a CNC mill.
I think you may have two options:
- Use one off-the-shelf package, like AMKACYCLE, from AMK Drives. (I think they are in Richmond), in this case you use servo drives. They also have single phase.
- Use step motors, with a PC based controller: In this case you use a controller card connected tru parallel port, and software.

I've seen both cases, and in MHO that first case is more suitable if you want to offer productivity. The second case probably is more cost efective.

regards