Re: [CAD_CAM_EDM_DRO] Re: Servo Motor & Driver

Hi Jimsonchan,

Can you give me more details of the "SERVO" motor which you described as special stepper motor?

It seems the VR motor is actually what they described as Variable Reluctance Motor, whatever that means.

Do you have any experience of changing out the said "Servo VR Motor" and using other type of stepper motors?

Will greatly appreciate your kind advise.

Best regards,
WT

----- Original Message ----
From: ballscrewpro1 <ballscrewpro1@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Saturday, June 16, 2007 1:54:14 AM
Subject: [CAD_CAM_EDM_DRO] Re: Servo Motor & Driver













--- In CAD_CAM_EDM_ DRO@yahoogroups. com, "weedytan" <weedytan@.. .>

wrote:>> Hi all,> > I was asked by a friend to look at a Taiwan made

ACRA Vertical NC Mill> (year 1996 or 1997) today wherein the

controller is dead and to find> out the feasibility of converting it

to a CNC using Mach3 or EMC. Here> are some details:> > 1) The servo

motor has a name plate that says: Special VR Motor made> by Servo

Products Co., Pasadena; Voltage - 350VDC; Torque - 115 in-lb>

(continuous) ; Current - 6 amp/phase; 3 phase; 3.2 Ohms/phase; 400 RPM

> 2) The servo driver board says ZD-6363 Rev I.

> 3) This is a 3-axis NC mill with 3 HP Induction Motor for the

spindle> controlled by a VFD.> 4) It wasn't in use for about 2 years

and it boot up Windows 98. After> which, it will not go into the

software controller.> > Since I am more used to Stepper tors/Drivers,

and totally ignorant> of Servo Motors, may I ask for some assistance

for the following:> > 1) How can I test without going thru the

controller if the servo > motors and/or servo drivers are still alive?

> 2) If the servo drivers are dead (most likely, as someone previously

> worked on it and gave up), what alternative servo driver can I use?

> 3) Is it advisable to use stepper motors/drivers to replace the

servo > motors/drivers in the same holding torque range? If not, and

if I need > to replace the servo motors as well, what newer model of

servo motors > and drivers can I use? Take note that the servo motor

has a continuous > torque of 115 in-lb (about 13 Nm or 1,840 oz-in).

> TIA for whatever info you can provide.> > WT>

I have one of this machine call supermax using servo2 control

Don't get mislead by the name "servo product" Actually the company

is called servo and don't have any actual servo product with them.

In the early days they made most of the power feed for Bridgeport

machines. "VR motor" is some kind of special stepper motor, When

travel rapid It roar louder that our normal stepper motor.

You will never going to use the motor and driver due to proprietary

parts.

Regards Jimsonchan














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