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SG helical-worm gearmotor series

Manufacturer catalogue image · Series illustration

Geared motors

SG helical-worm gearmotor series

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Gear Arrangement
Helical-worm
Power
Confirm configuration
Voltage
Confirm supply
Speed
Model dependent

Catalogue series · Exact configuration and availability confirmed by the manufacturer.

SG37 selection: distinguish motor power from power at the slow shaft

A helical-worm assembly is not a lossless speed converter. GPG’s SG37 table pairs the same 0.12 kW four-pole motor with different output speeds and torques. Calculating output power from those paired values helps prevent a nominal motor-power figure from becoming an unrealistic load requirement.

What three 0.12 kW catalogue points imply at the output

The SG37 table uses 1450 rpm input. The last column is calculated as P = T × n / 9550, using the listed output torque in N·m and speed in rpm; it is not an independently tested efficiency result.

RatioOutput rpmTorque N·mCalculated kW
23.91 60.6 15 0.095
68.00 21.3 39 0.087
204.0 7.11 85 0.063

Specify the slow-shaft task before choosing the motor

A load needing 0.12 kW at 7.11 rpm needs a different selection

That hypothetical load requires about 161 N·m, calculated from 9550 × 0.12 / 7.11. The SG37 0.12 kW row at ratio 204.0 lists 85 N·m, so matching the motor’s 0.12 kW label would not satisfy that output requirement. Give the supplier the required output torque and speed together, including breakaway load, rather than specifying motor power alone.

The calculation does not establish a heat rating

These are rounded catalogue operating points, and 0.12 kW identifies the motor-power row rather than a measured gearbox input at every load. Their difference must not be presented as a certified heat loss or an electrical-consumption figure. For continuous operation, obtain the selected gearbox’s thermal approval for the ambient temperature, installation position and running hours. The SG37 table’s FB value at ratio 204.0 is 1.08; it is not a separate thermal rating.

Two operating questions that the ratio alone cannot answer

Must the load stay in position after power is removed?

The SG selection sheets provide torque and dimensional data but no validated holding or self-locking rating for this example. If the application can drive the gearbox backward, define the required holding torque and stopping sequence and obtain a suitable brake or other approved holding arrangement. A high ratio or the presence of a worm stage is not, by itself, evidence that the load will remain stationary.

Will this replace a gearbox that was already running hot?

Provide the previous ratio, load cycle, mounting-position sketch and temperature history with the inquiry. The catalogue’s appended troubleshooting guide identifies incorrect oil level and aged lubricant among possible temperature-related issues; it also discusses optional cooling equipment that should not be assumed to exist on SG37. Establish the actual unit’s lubrication and ventilation requirements before treating a larger motor as the remedy.

CATALOGUE OVERVIEW

About this motor series

GPG SG helical-worm gearmotors combine a worm stage with helical gearing. The SG37 catalogue provides paired ratio, speed and output-torque values, allowing a load to be specified at the slow shaft rather than by motor power alone. The examples below separate calculated mechanical output, continuous thermal duty and power-off holding requirements.

Model / series reference: SG

Published specifications

Specifications describe a series range; confirm which ratings apply together to the quoted model.

Gear Arrangement
Helical-worm
Power
Confirm configuration
Voltage
Confirm supply
Speed
Model dependent
Selection
Specify output torque, speed and service factor
Catalogue Type
Product series

Confirm mounting and shaft dimensions against the drawing for the quoted configuration.

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