Moog Animatics SmartMotor™ Developer's Guide,Rev. L
Page 890 of 909
Example 1: Rotary Application
Suppose you have a load that requires 300 RPM at the output of a gear head, and the optimum
speed range for the motor is 2100 RPM.
Divide the optimum operating speed by the load speed to get the ideal gear reduction. In this
case: 2100 RPM / 300 RPM = 7. So a 7:1 gear reduction would allow the motor to operate in its
most efficient range.
Example 2: Linear Application
Suppose you need to run at 100 mm/sec using a ball screw, and the motor has an ideal range
of 3000 RPM. 3000 RPM / 60 = 50 rotations per second (RPS). 100 mm/sec divided by 50 RPS
is 2 mm per rotation. Therefore, an ideal pitch would be 2 mm.
Dyno Test Data vs. the Derated Torque Curve
NOTE: For any given product model number, there may be variations of as much
as ±10%.
The following diagram depicts data points collected from dyno testing of a given SmartMotor
model. A best-fit torque curve is created from these data points and is then derated to at least
5% below the worst case data points. The derated curve is shown in the Moog Animatics
Product Catalog. This means that within any given model number, every motor sold will
perform at or higher than the advertised torque. Theoretically, all motors should be no less
than 5% higher than advertised and may be more than 20% higher.
Motor Shaft Speed (RPM)
Motor Torque
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Motor Loading Areas
The diagram shows motor loading in four areas:
1.
This is ideal and depicts a load within the normal operating range of the motor. The
motor should operate well and have no problems for many years.
Appendix: Example 1: Rotary Application
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