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March 6, 2012 / sydneybrookspewa

How to Make Servo Motor Sizing Easy

Shifting from manual calculation to software simulation for servo selection may seem like overkill for those that have the experience of doing so. However, for most, selecting the correct servo is often approximated according to the current motor that’s on the system or with the aid of the manufactures.

In this blog I will demonstrate the Panasonic motor selection tool software that makes it easy to select the correct servo with confidence. Download Panasonic’s servo sizing tool:

Example: Ball Screw Mechanism

  • Work piece weight WA = 10 [kg]
  • Ball screw length BL = 0.5 [m]
  • Ball screw diameter BD = 0.02 [m]
  • Ball screw lead (pitch) BP = 0.02 [m]
  • Ball screw efficiency B = 0.9
  • Travel distance 0.3 [m]
  • Coupling inertia Jc = 10 x 10-6 [kg /m2]

Running Pattern:

  • Acceleration time ta = 0.1 [s]
  • Constant-velocity time tb = 0.8 [s]
  • Deceleration time td = 0.1 [s]
  • Cycle time tc = 2 [s]
  • Travel distance 0.3 [m]

Results of example:

The software tool shows the A4 MSMD series 200W motor to be the smallest motor that will work for this application.

Try this simple application above

1. Enter the system mechanism

2. Enter the Running Pattern

3. Chose the Selection of Motor tab, select a motor series and operating voltage

4. Click on any motor model above to see detail results from the calculations

It’s that simple! If you’ve had the chance to try this small example, you will have realized that sizing does not have to be a complicated matter. Accurate sizing is simple and when using Panasonic’s software you can be confident that not only will the motor work for your application but it will be the most efficient and economical motor available. Never will the motor for your application be over or undersized again.


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