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GR-EP-45 High Power 45mm Planetary Gearmotor


The GR-EP-45 is high-powered motor and planetary (epicyclic) gearbox combination, available from-stock with four different gearbox ratios: 3.7:1, 13.7:1, 50.9:1, 188:1.

The motor may be operated at anywhere between 3-18V DC, with a maximum continuous output of nearly 200W at 18V (provided sufficient cooling). Operating characteristics are given for a range of voltages under the 'Technical Details' tab below.

Each gearbox is 45mm in diameter with a 10mm diameter mounting shaft with 4mm wide keyway slot. Please read on below for more information.



£43.00 £51.60 inc VAT
Options:
Quantity:
In Stock
Group SKU: GR-EP-45

This model of motor is the higher-powered relative of our GR-EP-45E, a model popular with robotics hobbyists and special effects designers. With both a high and low gear reduction option many different projects could benefit from the compact and easy-to-mount nature of these motors. 

The motor itself features an internal cooling fan to accommodate high power output (and the resultant heat production). Ensure that the air-vents at the rear of the motor are not obstructed when the motor is in operation.

We also stock a mounting bracket and a shaft mounting hub perfect for use with this motor.

Two copper tabs at the back of the motor are suitable for connection using 4.8mm female spade connectors, however we also offer an option for 500mm long silicone-insulated leads (1.5mm2) to be installed ready for use. Allow for one extra working day to process your order if a lead option is added, since these are soldered and insulated to-order.


User advice

This motor operates like any other DC motor and so may be used at voltages other than the nominal 18V with changed operating characteristics (please be aware that the warranty does not cover operation above 18V). To change the motor direction swap the polarity of the power to the motor contacts (invert positive and negative). The motor is neutrally timed and so will travel at approximately the same speed in both directions.

Current protection, such as a fuse or automatic overcurrent switch should be used to ensure that the motor and gearbox are not damaged due to overloading.

It is recommended, though not strictly necessary, to 'break-in' a new motor and gearbox before use, this is done by running for a couple of minutes continuously in both directions (polarity one way then the other) under no load. This ensures that the gears are running freely and the motor brushes are well seated on the commutator before being subjected to a load. 


Detailed specifications are available under the Technical Details section below.

Jump to section:    Motor Dimensions   —   Gearbox Build Detail   —   Operating Characteristics with 13.7:1   —   Operating Characteristics with 188:1


Motor Dimensions

CAD models are available, please contact us for a copy. 


 


Gearbox Build Detail
Mounting:Four M4 x 9mm threaded holes on the front face of the gearbox (see above diagram). PCD 35mm.
Body material:Steel & aluminium, with copper and nickel plating.
Gearbox type:Planetary/epicyclic. There are differing numbers of transmission stages per gearbox,
one stage for the 3.7:1, two stages for the 13.7:1, three stages for the 50.9:1 and four stages for the
188:1 ratio.
Shaft type:10mm by 24mm long steel, copper and nickel plated for corrosion resistance.
Features a 20mm long, 4mm wide and 2.5mm deep rectangular keyway.
Shaft support:Dual 10mm 6900Z deep groove ball bearings.
Weight:Excluding optional leads
 With 3.7:1 gearbox: 640g
 With 13.7:1 gearbox: 760g
 With 50.9:1 gearbox: 865g
 With 188:1 gearbox: 980g




Motor performance guide for each gearbox option:


3.7:1 Ratio Gearbox
at 18V DC (nominal voltage):
at 12V DC:
at 6V DC:
No-load speed after gearbox:5621rpm3747rpm1874rpm
No-load current:2.5A2.0A1.4A
Rated (maximum continuous) 
torque, speed:
3.84kg-cm, 4926rpm
2.56kg-cm, 3284rpm1.28kg-cm, 1642rpm
Rated load current:
15.8A10.6A5.3A
Rated load output power:194W86W22W
Maximum power torque, speed:14.5kg-cm, 2839rpm9.66kg-cm, 1893rpm4.83kg-cm, 946rpm
Maximum power current:53.1A35.4A17.7A
Maximum output power:
422W188W47W
Theoretical stall torque:
28.0kg-cm*19.3kg-cm*9.66kg-cm*
Stall current:
104A*
69.2A*
34.8A*

The maximum-rated gearbox output torque is 150kg-cm (14.7Nm), try to prevent shock/impact loads that could exceed this. 

*Highlighted values should not be reached. You should use current protection to protect the motor from overload (using for example a fuse, breaker or digital current limiting switch), since if is operated at too high a sustained load, or allowed to stall, the motor could quickly overheat.

Please be aware that many of the values above are extrapolated from other measurements and there will be some variance from motor to motor, allow for a safety factor of at least 15% above/below the given values when designing for your application. Output torque and power values are based upon an average 90% gearbox transfer efficiency for this gearbox, which more precisely has a 3.706:1 ratio. The continuous duty rating is based upon there being sufficient cooling for the motor and gearbox, the operating temperature should be kept below 40°C and free air flow should be ensured to prevent overheating. Be sure that any equipment that you use with the motor (power source and controller) is capable of handling the currents that the motor may demand.



13.7:1 Ratio Gearbox
at 18V DC (nominal voltage):
at 12V DC:
at 6V DC:
No-load speed after gearbox:1517rpm1011rpm505rpm
No-load current:2.5A2.0A1.4A
Rated (maximum continuous) 
torque, speed:
12.8kg-cm, 1329rpm
8.5kg-cm, 886rpm4.3kg-cm, 443rpm
Rated load current:
15.8A10.6A5.3A
Rated load output power:175W78W19W
Maximum power torque, speed:48.3kg-cm, 766rpm32.2kg-cm, 511rpm16.1kg-cm, 255rpm
Maximum power current:53.1A35.4A17.7A
Maximum output power:
380W169W42W
Theoretical stall torque:
96.7kg-cm*64.4kg-cm*32.2kg-cm*
Stall current:
104A*
69.2A*
34.8A*

The maximum-rated gearbox output torque is 150kg-cm (14.7Nm), try to prevent shock/impact loads that could exceed this. 

*Highlighted values should not be reached. You should use current protection to protect the motor from overload (using for example a fuse, breaker or digital current limiting switch), since if is operated at too high a sustained load, or allowed to stall, the motor could quickly overheat.

Please be aware that many of the values above are extrapolated from other measurements and there will be some variance from motor to motor, allow for a safety factor of at least 15% above/below the given values when designing for your application. Output torque and power values are based upon an average 81% gearbox transfer efficiency for this gearbox, which more precisely has a 13.734:1 ratio. The continuous duty rating is based upon there being sufficient cooling for the motor and gearbox, the operating temperature should be kept below 40°C and free air flow should be ensured to prevent overheating. Be sure that any equipment that you use with the motor (power source and controller) is capable of handling the currents that the motor may demand.



50.9:1 Ratio Gearbox
at 18V DC (nominal voltage):
at 12V DC:
at 6V DC:
No-load speed after gearbox:409rpm273rpm136rpm
No-load current:2.5A2.0A1.4A
Rated (maximum continuous) 
torque, speed:
42.7kg-cm, 359rpm
28.5kg-cm, 239rpm14.2kg-cm, 120rpm
Rated load current:
15.8A10.6A5.3A
Rated load output power:157W70W17W
Maximum power torque, speed:161kg-cm, 207rpm*108kg-cm, 138rpm53.8kg-cm, 69rpm
Maximum power current:53.1A*35.4A17.7A
Maximum output power:
343W*152W38W
Theoretical stall torque:
323kg-cm*215kg-cm*108kg-cm*
Stall current:
104A*
69.2A*
34.8A*

*Highlighted values should not be reached. The maximum-rated gearbox output torque is 150kg-cm (14.7Nm), you should ensure that the motor current is limited to below 49A (using for example a fuse, breaker or digital current limiting switch) as beyond this the motor is capable of generating a much greater torque that is likely to damage the gearbox.

Please be aware that many of the values above are extrapolated from other measurements and there will be some variance from motor to motor, allow for a safety factor of at least 15% above/below the given values when designing for your application. Output torque and power values are based upon an average 73% gearbox transfer efficiency for this gearbox, which more precisely has a 50.895:1 ratio. The continuous duty rating is based upon there being sufficient cooling for the motor and gearbox, the operating temperature should be kept below 40°C and free air flow should be ensured to prevent overheating. Be sure that any equipment that you use with the motor (power source and controller) is capable of handling the currents that the motor may demand.



188:1 Ratio Gearbox
at 18V DC (nominal voltage):
at 12V DC:
at 6V DC:
No-load speed after gearbox:110rpm73rpm36rpm
No-load current:2.5A2.0A1.4A
Rated (maximum continuous) 
torque, speed:
141kg-cm, 97rpm
94.0kg-cm, 65rpm47.0kg-cm, 32rpm
Rated load current:
15.8A10.6A5.3A
Rated load output power:140W62W16W
Maximum power torque, speed:533kg-cm, 56rpm*355kg-cm, 37rpm*178kg-cm, 19rpm*
Maximum power current:53.1A*35.4A*17.7A*
Maximum output power:
305W*136W*34W*
Theoretical stall torque:
1065kg-cm*710kg-cm*355kg-cm*
Stall current:
104A*
69.2A*
34.8A*

*Highlighted values should not be reached. The maximum-rated gearbox output torque is 150kg-cm (14.7Nm), you should ensure that the motor current is limited to below 16A (using for example a fuse, breaker or digital current limiting switch) as beyond this the motor is capable of generating a much greater torque that is likely to damage the gearbox.

Please be aware that many of the values above are extrapolated from other measurements and there will be some variance from motor to motor, allow for a safety factor of at least 15% above/below the given values when designing for your application. Output torque and power values are based upon an average 65% gearbox transfer efficiency for this gearbox, which more precisely has a 188.611:1 ratio. The continuous duty rating is based upon there being sufficient cooling for the motor and gearbox, the operating temperature should be kept below 40°C and free air flow should be ensured to prevent overheating. Be sure that any equipment that you use with the motor (power source and controller) is capable of handling the currents that the motor may demand.




If you have any queries about this item, including for information on custom ratios, controllers, and bulk pricing, then please contact us.

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