Frame 42
Planetary & Cycloidal Gearboxes

Empire Magnetics Inc. prepares gearboxes to operate in the same environments as the motors and resolvers. We start with high quality planetary gearboxes. These units are selected to provide maximum torque capacity with the smallest practical volume. We then upgrade the materials construction and lubrication to meet the requirements of the environment.

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Specifications

Model Number Drawing Number Gear Ratio Backlash (degrees) Min Eff
(%)
Gearhead Length (in) Weight (lbs) Max Rated Continuous Torque (in-lb) Momentary Torque (in-lb) Reflected Inertia (oz-in^2)
42P:3 G2500007 3 0.10 90 4.73 11.5 2301 3597 6.02
42P:4 G2500007 4 0.10 90 4.73 11.5 2195 3430 3.80
42P:5.5 G2500007 5.5 0.10 90 4.73 11.5 2021 3159 2.31
42P:7 G2500007 7 0.10 90 4.73 11.5 1711 2673 1.64
42P:10 G2500007 10 0.10 90 4.73 11.5 1122 1684 1.08
42P:16 G2500008 16 0.17 85 6.36 18 2379 3717 3.83
42P:22 G2500008 22 0.17 85 6.36 18 2414 3772 3.71
42P:28 G2500008 28 0.17 85 6.36 18 2438 3811 3.66
42P:40 G2500008 40 0.17 85 6.36 18 2473 3865 1.08
42P:49 G2500008 49 0.17 85 6.36 18 1867 2918 1.59
42P:55 G2500008 55 0.17 85 6.36 18 2250 3516 1.06
42P:70 G2500008 70 0.17 85 6.36 18 1890 2953 1.05
42P:100 G2500008 100 0.17 85 6.36 18 1031 1547 1.05
Gearboxes for stepper motors and brushless motors are designed for the accurate positional functions desired of such systems.
All of the planetary gearheads provide "in line" power transfer so there is no offset from the motor shaft to the output shaft of the gearhead.
Vacuum rated gearboxes have all the materials selected or replaced with items that are compatible with VC, VS, or VX grades. The VS and VX grades are cleaned in the same exacting fashion as other components of this vacuum level.
For VX grade we offer dry film lubrications as an option, while the vapor pressure is lower on dry film lubrications, the wear life is also lower. The application specifics must be considered to make the decision.
Planetary gearboxes are available for stepper motors from size 17 to size 65, adapted versions of these same gearboxes can be mounted to brushless servo motors as well.

Cycloidal gearboxes

The epicycloidal gearboxes are offered with the larger motors as they provide some unique features.
The Cycloidal gearboxes are typically 93% efficient at working speeds; thus makes them ideal for power transfer applications. These gearboxes are able to provide family of gear ratios and very high ratios in a compact fixed size. These gearboxes have momentary peak torque capacity five times the continuous ratings.
While the power transfer capacity of the gearbox is excellent, and the rugged construction of the units will survive much abuse, the epicycloidal motions will introduce sinusoidal velocity ripple into the system. As such, these gearboxes are excellent choices for step and repeat, or point A and B type functions. They are not good choices when the travel path, or travel velocity between the points is critical.
In addition to the standard mechanical features of the cycloidal gearbox, the package configuration allows the addition of a zero backlash feedback device. For more details refer to the drawings, however in brief, the feedback device is connected directly to the output shaft of the gearbox. Neither the gear ratio nor the backlash of the gears will affect the reading as there is a solid shaft driving the feedback device.

Due to the size, Cycloidal gearboxes are offered only with size 42 and larger motors.

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Cycloidal Gearboxes
Specifications

Model Number C:6 C:11 C:17 C:29
Drawing Number M2400038 M2400038 M2400038 M2400038
Gear Ratio 6 11 17 29
Compatible Motors U41, U42, U43 U41, U42, U43 U41, U42, U43 U41, U42, U43
Backlash (degrees) 0.8-1.1 0.8-1.1 0.5-0.65 0.5-0.65
Repeatability (degrees) 0.01 0.01 0.01 0.01
Minimum Efficiency (%) 90 90 90 90
Maximum Radial Load (lbs) 1100 1100 1100 1100
Maximum Axial Load (lbs) 660 660 660 660
Shaft Runout (in) 0.001 0.001 0.001 0.001
Radial Play (in) 0.001 0.001 0.001 0.001
End Play (in) 0.0002 0.0002 0.0002 0.0002
Flange Width (in) 6.3 6.3 6.3 6.3
Gearhead Length (in) 5.0 5.0 5.0 5.0
Weight (lbs) 34.1 34.1 34.1 34.1
Maximum Rated
Continuous Torque (in-lb)
601 1104 1500 1620
Maximum Input RPM 3000 3000 3000 3000