Author Topic: DC brushed servo motor driver recomendation  (Read 2062 times)

0 Members and 1 Guest are viewing this topic.

Offline N4NV

  • Active Member
  • Posts: 391
    • View Profile
DC brushed servo motor driver recomendation
« on: May 22, 2017, 07:12:08 PM »
I am going to upgrade my Yamazan Knee mill's DC servo drives (the mill weighs close to 5,000 pounds).  It has NEMA 42 motors, max 65 amps and 140V.  I am looking for servo drive recommendations for drives that work well with Mach.  The Gecko servo drives are only 80V and 20 amps and would limit the machine's capabilities.

Thanks,

Vince

Offline DonMarkey

  • Active Member
  • Posts: 95
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #1 on: May 22, 2017, 08:26:02 PM »
I have been playing around with machdrives and like them so far. The have dual encoder support. David over there is one of the greatest in customer support.
Don

Offline N4NV

  • Active Member
  • Posts: 391
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #2 on: May 22, 2017, 09:39:19 PM »
Thanks for the heads up.  The amps might be a little low for my motors.  I sent them a question to see if there drive can run my motors. 
How easy was it to tune the drives?  I had a heck of a time with Gecko servo drives.

Vince

Offline DonMarkey

  • Active Member
  • Posts: 95
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #3 on: May 22, 2017, 09:47:07 PM »
So far pretty easy. I am only running motor encoders now and plan to add the linears later. I like the limits going thru the drives to allow easy use of the encoder's index for homing. 45a @140v seems high. Is that the old drive spec or from the motor?
Don

Offline DonMarkey

  • Active Member
  • Posts: 95
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #4 on: May 22, 2017, 09:52:10 PM »
My motors are electro craft e703. The motor spec says max peak 45a but max cont 9.6a. The old drives were 15a fets. They run fine with these. Of course my machine is smaller around 3500 lbs.

Offline N4NV

  • Active Member
  • Posts: 391
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #5 on: May 22, 2017, 10:12:17 PM »
45a @140v seems high. Is that the old drive spec or from the motor?
Don

The existing drives are rated 30A.  The constant stall current is 11.3A, peak 65A.  The machine can do 400 IPM rapids.  Coming to a stop from that speed can blow a drive.  The existing drives are Servo Dynamics.  They sell for $1400 each.

Vince

Offline DonMarkey

  • Active Member
  • Posts: 95
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #6 on: May 31, 2017, 07:49:52 PM »
Any luck with a drive?
Don

Offline N4NV

  • Active Member
  • Posts: 391
    • View Profile
Re: DC brushed servo motor driver recomendation
« Reply #7 on: May 31, 2017, 10:40:42 PM »
Any luck with a drive?
Don
Any luck with a drive?
Don
Yes, I am going to try the Machdrive BRC 150V servo drive.  https://machdrives.com/brc.aspx
The should arrive in the next couple of days.  I will post when I get them up and running.  If you don't see anything here in the next couple of weeks, post a reminder.

Vince