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Control.com member...
Member Information and Posts by Bull
Company: Bull's Eye Marketing, Inc.
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Why Integration in PID causes overshoot?
Originally posted by Controller on 14 May, 2014 - 1:40 pm
Understanding of how PID controller affect a system.
New Replies:
I have a booklet called "Servo Basics for the Layman" which answers most of your...
Topic: Application Questions and Problems
from the Placing the blame. department...
Risk assessment responsibility
Posted by Tom Bullock on 19 February, 2013 - 10:34 am
Who is responsible for risk?
Topic: Application Questions and Problems
from the Forum department...
Safety risk assessment
Originally posted by Tom Bullock on 5 February, 2013 - 11:20 am
Safety risk assessment report
New Replies:
It looks as if you are saying that a single person can do the assessment,but it will be reviewed by...
Topic: The Business of Automation and Control
from the To be or not to be. department...
Safety risk assessment??
Posted by Tom Bullock on 30 January, 2013 - 11:18 am
Should one perform a formal safety risk assessment?
Topic: Application Questions and Problems
from the Forum department...
OSHA safety inspection
Posted by Tom Bullock on 8 January, 2013 - 11:09 am
Working with OSHA inspectors.
Topic: Motion control, servos, steppers, etc.
from the Reaktion department...
Control loop reaction when high speed
Originally posted by AmazingTrans on 7 September, 2012 - 9:01 am
Servo Drive reaction when at high speed and torque require exceed max torque on motor.
New Replies:
Because this is a servo loop with feedback, the system will only demand from the motor wharever is...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
PID Controller
Originally posted by McCarthy02 on 20 November, 2011 - 10:47 am
DC Motor Speed Control using PID
New Replies:
George Younkin, a servo expert who passed away on Oct 17, left a copy of all his papers with me. ...
Originally posted by Kim Taeyeon on 16 September, 2011 - 12:01 am
Transfer function of the BLDC Motor
New Replies:
George Younkin (gwyounkin@charter.net) has authored a number of papers regarding motion and servos....
Topic: Motion control, servos, steppers, etc.
from the Forum department...
transfer function of BLDc motors
Originally posted by shrinivas on 19 November, 2010 - 3:33 am
Help me in my project on DTC of BLDC motor
New Replies:
Email George Younkin: george@bullseyenet.com. He has a bunch of papers related to servos and...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Current taken by servo motor
Originally posted by Denson K O on 22 September, 2009 - 12:59 am
One of our engineer did a application its a vertical axis,servo motor connected with a ball screw....
New Replies:
If the vertical axis is not counterbalanced, it will require current to develop enough force to...
Topic: Engineering and workplace issues.
from the What are users using? department...
Technologies being accepted
Posted by Tom Bullock on 22 September, 2009 - 11:26 am
Some technologies have been in development for years, but only a few enjoy commercial success.
Topic: Motion control, servos, steppers, etc.
from the impossible acceleration department...
Accelerating faster than physics
Originally posted by Mike Jones on 22 December, 2006 - 12:48 am
Problem winding paper onto a spindle when the spindle motor is in "torque mode"...
New Replies:
You need an acceleration feedforward algorithm thst takes into account the diameter of the winnding...
Topic: Motion control, servos, steppers, etc.
from the bearing problems department...
motor bearing problems driven by vfd
Originally posted by ravi on 29 June, 2005 - 7:46 pm
i want to know how bearings of motors driven by vfd, worn out early than motors runs with normal speed.
New Replies:
Are you sure the problem isn't mechanical? Do you have a flexible coupling between motor and...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
the effects of carrier frequancy on pwm drives
Originally posted by moh on 8 June, 2005 - 5:20 pm
i asked about the effects of carrier frequancy on the pwm ac drives. And what happens if it increased or decreased.
New Replies:
The PWM carrier frequency is like a sample data system. The rule of thumb is that the frequency...
Topic: Motion control, servos, steppers, etc.
from the HELP PLEASE department...
Permanent Magnet DC Motor Transfer Function
Originally posted by Damian on 15 February, 2005 - 12:41 am
Need to convert transfer function of PMDC motor
New Replies:
My partner, George Younkin, wrote a paper on this. Send me your e-mail address and I'll forward 2...
Topic: Motion control, servos, steppers, etc.
from the Engineering department...
hydraulic servo valve control
Originally posted by Doug Swier on 23 September, 2004 - 3:22 pm
Has anyone successfully used a traditional DCS for closed-loop pressure control where fast-acting hydraulic servo valves are the final control element?
New Replies:
If you close the loop through the DCS and it can only service the loop every half second, your...
Topic: Motion control, servos, steppers, etc.
from the EE department...
Calculation motor resolution
Originally posted by Eugene on 12 March, 2004 - 12:36 am
friction drive accuracy...
New Replies:
The number of counts for a 10.7mm step is: (10.7x96,000)/139.802pi It comes out to...
Topic: Motion control, servos, steppers, etc.
from the serious department...
Position controller algorithm
Originally posted by George on 5 February, 2004 - 1:58 am
About implementing a PID Position controller algorithm to control a PMSM motor with trapezoidal speed-time response.
New Replies:
Go to the control.com web site. Under luminaries, select BULL! Under tutorials select Command...
Topic: The Business of Automation and Control
from the Automation List department...
State of the automation business
Originally posted by Bob Peterson on 30 September, 2003 - 1:10 pm
I ran across a guy recently that I have known for nearly 20 years, but had not seen for a year or two. He is now selling insurance, having decided that there is no real future in the industrial automation business.
New Replies:
Don't be so pessimistic. Manufacturing employment as a percent of the workforce has been declining...
Topic: Motion control, servos, steppers, etc.
from the electrical vehicle department...
analog pid circuit design
Originally posted by SERDAR on 21 January, 2004 - 12:09 pm
Can anyone guide me where I can study how to construct a analog PID circuit practically to control a dc motor?
New Replies:
Use an operational amp with input resistor R and capacitor feedack C. The capactive reactance...
Topic: Motion control, servos, steppers, etc.
from the horsepower department...
Horsepower
Originally posted by Troll on 15 January, 2004 - 1:04 am
determine hp of motor.
New Replies:
The RPM and TORQUE that you use in the equation below should come from the upper right hand corner...
Topic: Motion control, servos, steppers, etc.
from the 2-day generic servo training department...
Servo education
Posted by Thomas B. Bullock on 17 November, 2003 - 4:20 pm
2-day servo training addresses posted concerns...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Higher resolution vs. lower resolution encoder
Originally posted by Ting, Penang on 22 October, 2003 - 7:19 pm
What is the significant value by using a higher resolution encoder over a lower resolution in a motor (specifically in a stepper motor)?
New Replies:
Obviously, the resolution of the encoder must be better than the least increment of accuracy that...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Servo control using computer
Originally posted by Harish on 22 August, 2003 - 12:06 am
I need a formula which could plot circle given center and radius.
New Replies:
Go to control.com. Look under the BULL! luminary and read the paper entitled "Command...
Topic: Motion control, servos, steppers, etc.
from the Home Motion department...
Synchronizing axes in Homemade Plotter
Originally posted by Daniel Marin Valencia on 11 June, 2003 - 1:37 am
I'm developing a homemade Plotter with small permanent magnet DC motors and incremental encoders; using independent proportional velocity control loop for each axis.
New Replies:
Daniel, Go to http://www.control.com and look under the BULL! luminary. You will find a paper...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Transfer function for BLDC motor !
Originally posted by R G Sachithanandam on 27 March, 2003 - 3:13 pm
Could anybody plz give me the transfer function of Brush less DC (bldc) motor!
Is it same as that of for commutated DC motor?
New Replies:
I have a paper with that transfer function. E-mail me and I'll forward it to you. Tom Thomas B....
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
INDUCTOSYN output
Originally posted by R Azar on 2 March, 2003 - 1:29 pm
CNC Unit doesn't accept Inductosyn type inputs
New Replies:
Yes, Inductosyn Corporation out of Valhalla, NY offers just such a device. There may be other...
Topic: Motion control, servos, steppers, etc.
from the department...
DC brush Motor Drive
Originally posted by MVikas on 23 January, 2003 - 2:57 pm
Questions about stiffness in motor rotor and integrators in speed loops
New Replies:
Vikas, If there is nothing attached to the motor shaft, there is no torque. As soon as you grab it...
Topic: Motion control, servos, steppers, etc.
from the stuck department...
d.c servo
Originally posted by Anonymous on 23 November, 2002 - 4:23 pm
i am trying to obtain the transfere fuction of the motor of a d.c servo...
New Replies:
My cohort, George Younkin, has a paper entitled "Electric Servo Drive Motor Equations and...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Torque prediction with servo motor current
Originally posted by ddejager on 5 October, 2002 - 5:11 pm
Does anyone have experience or suggestion how to predict the torque of a servo motor by measuring the input current to the servo motor...
New Replies:
Look on the motor data sheets and you will find a "torque constant". Its units are...
Topic: Motion control, servos, steppers, etc.
from the department...
Servo tutorial
Originally posted by Anthony on 10 September, 2002 - 11:33 am
Need a good servo tutorial for mostly AC type motors.
New Replies:
Anthony, We have a 20 page booklet called "Servo Basics for the Layman". Would be happy...
Topic: Motion control, servos, steppers, etc.
from the individual department...
Logo for two axes control
Originally posted by agraj on 4 September, 2002 - 1:57 pm
can i use a logo for controling x and Y axes moment.
New Replies:
There used to be a "rule of thumb". Steppers for 0.5 horsepower or less and DC motors...
Topic: Motion control, servos, steppers, etc.
from the department...
Why should I use SERCOS?
Originally posted by SERCOS Seeker on 22 August, 2002 - 1:48 pm
Are you using SERCOS for Motion Control? Why should I? Is it the future?
New Replies:
Go to Control.com and click on the BULL! luminary. The last 3 Motion Control Forum transcripts are...
Topic: Motion control, servos, steppers, etc.
from the Code creates mess department...
G-Codes
Originally posted by Ragavendra Swamy on 26 July, 2002 - 10:50 am
Need some info. about G-Codes
New Replies:
Swamy, EIA RS 274D used to be the standard for G and M codes, but may now be replaced by a later...
Topic: Computers in manufacturing; also hardware discussion.
from the Exploring CNC department...
Interpolation using PLC
Originally posted by Anil HP on 28 May, 2002 - 11:20 am
Interested in motion control or CNC retrofit.
Have you got any idea for interpolation using PLC control instead of CNC.
New Replies:
If it's the equations that must be solved that you are looking for, go back to the Control.com home...
Topic: Engineering and workplace issues.
from the None department...
G&L CNC 800 Control Question
Originally posted by Rocco F. Dominick on 3 June, 2002 - 3:59 pm
Can anyone guide us in creating a punched tape for a G&L CNC 800 Control containing the machine constants?
New Replies:
The expert on the CNC800 is Pete Bartelme. He now works for MachineMate in Fond du Lac, WI. His...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Assynchronous AC motor as Axis Drive in CNC
Originally posted by Bhagwan Swaroop on 27 April, 2002 - 1:01 pm
I want to learn from earlier experience and accuracy achieved by using Asynchronous AC induction motors as an axis drive in Close loop
control for CNC machine tools.
New Replies:
You should be able to do this application with a 10KW or less motor if properly sized, geared, etc....
Topic: The Business of Automation and Control
from the None department...
Freelance
Originally posted by Donny on 19 April, 2002 - 5:11 pm
Looking for guidance on what to charge for writing Visual Basic applications as a freelancer
New Replies:
$75 per hour is a reasonable number. Or use 2.5 times your base hourly wage. In WI, you will see...
Topic: Motion control, servos, steppers, etc.
from the None department...
current control loop
Originally posted by jwang on 23 April, 2002 - 3:49 pm
I have a linear motor working in force control mode. I want to have a rough math model to this motor from reference current to the position...
New Replies:
Send snail mail company address and I'll send you a 25 page paper on this showing the LaPlace...
Topic: Motion control, servos, steppers, etc.
from the department...
AC Motor Converter
Originally posted by Duc Pham on 12 March, 2002 - 1:20 pm
Convertor for AC Motor to reduce the speed
New Replies:
Duc Pham, A 2 to 1 gear reducer will cut the speed in half and double the torque. Look up gear...
Originally posted by Dusk Mixon on 7 March, 2002 - 10:17 am
need to find a way to maintain a uniform delivery rate when driving a soil penetrometer into the ground
New Replies:
If you use a servo velocity loop, it will automatically adjust the torque in order to maintain the...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
S-curve calculation for motion trajectory
Originally posted by Bahni Bahnev on 25 February, 2002 - 2:30 pm
I need help how i calculate times of rizing, falling and constant jerk...
New Replies:
Send me your snail mail address and I'll send a couple of papers that might help. Sorry, but don't...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Seventh Annual Motion Control Forum
Posted by Tom Bullock on 13 February, 2002 - 10:34 am
Here is the transcript of the Seventh Annual Motion Control Forum (Sept. 2001), which brought together 10 top executives from the Motion industry to discuss the issues of the day.

Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Speed synchronization of 3 DC Motors
Originally posted by Faisal Saleem on 5 February, 2002 - 3:47 pm
I am working on the sizing machine which have three DC motors...
New Replies:
The best solution would be to make all three position servos and command them in parallel. An...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
IEC 1131 Motion Control
Originally posted by Terry Miller on 22 January, 2002 - 2:52 pm
Does anyone know where I can get information on the "new" IEC Motion Control standards, programming tools, function blocks, etc?
New Replies:
Try Eelco Van der Wal. He is the executive director of PLCopen in the Netherlands. I don't have...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
CNC position queries from RS-232?
Originally posted by Bill Sturm on 22 January, 2002 - 11:41 am
I am generally familiar with inputting a CNC program from a terminal to a Fanuc CNC. What I would like to know is if there is a way to send a command and have the CNC return actual position, target position, velocity, current block...
New Replies:
Some of the older CNC's were set up to transmit information to a host computer as well as allowing...
Topic: Engineering and workplace issues.
from the from student of kolej bandar utama department...
current to voltage converter ( high current )
Originally posted by alex_tan on 26 October, 2001 - 10:03 am
I want to know how to convert a high current(about 10A )to voltage. ...
New Replies:
Use a low ohmic value precision resistor in the 10 amp line. The precision of the resistor depends...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Motor Time Constants paper
Originally posted by Tom Bullock on 24 September, 2001 - 4:35 pm
This paper shows how to compute the
motor/load time constants for standard DC motors and 3 phase AC brushless.

New Replies:
Dick, This paper is a condensed version of a 6 page paper that I will e-mail to you. We are not...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
"Working With Servos" training seminar
Posted by Tom Bullock on 26 September, 2001 - 2:33 pm
"Working With Servos" seminar will be suspended until the economy improves. The 2 day (with an optional 3rd day) training seminar on servo basics and the practical application of servos will still be taught in-house during the 2001/2002 season. ...
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