Rockwell Automation Motion Analyzer Software - Manual (Page 213)

Rockwell Automation Publication MOTION-UM004B-EN-P - October 2012 213
Understanding Your System Solution Chapter 3
The Motion Analyzer database contains the Input Pinion Inertia for every
available gearbox. In this example, the Input Pinion Inertia is 0.00298 kg-m
2
. To
obtain a correct inertia ratio, Motion Analyzer software adds the Input Pinion
Inertia to the Reported Motor Inertia, which decreases the application inertia
and increases the motor inertia. Division produces the correct inertia ratio of
6.50:1.
The individual component tabs (for example, Motor, Drive, Gearbox and
Transmission) provide detailed performance information.
Figure 158 - Motor Tab
In the Motor tab, the brake rating compares the maximum static torque that can
be applied to the brake with the quoted holding torque of the brake. This
normally occurs when the drive is disabled with the motor/load stationary. This
static torque arises from any applied load torques or forces, including
gravitational effects. It does not take into account friction. If a high proportion of
the brake torque (or force) is used for static loads, then little may be left in case
the brake is required to stop motion suddenly. Brakes reduce performance if
operated during motion. The motor brake is intended as a holding brake applied
when motion is stopped and cannot be relied upon to stop a moving load when
the drive fails or loses power. An independent method of stopping is
recommended for all emergency situations where there is a gravitational load or
applied force/torque. A resistive brake module provides some braking but will
never stop a mechanism with a gravitational load or applied force/torque.
If available, Get Engineering Data opens a webpage with the Product Description
and Supplementary Documents for the selected product.
0.07274 - 0.00298
0.00775 + 0.00298
6.50
1.0
=