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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 with either a low-reduction high-speed 13.7:1 gearbox or a high-reduction low-speed 188:1 gearbox. 

The motor may be operated at anywhere between 3-18V DC, with a maximum continuous output of 200W at 18V. Operating characteristics are given for a range of voltages under the 'technical details' tab below.

Each gearbox is 45mm in diameter and the motor and gearbox assembly is a total of 147mm long with the 13.7:1 gearbox or 169mm long with the 188:1 gearbox. 


£41.60 £49.92 inc VAT
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Quantity:
In Stock
Group SKU: GR-EP-45

This model of motor is the higher-powered relative of our GR12, a motor 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-use 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.

Two copper tabs at the back of the body can be used to solder or crimp wires to, though 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.

It is recommended to 'break-in' a new motor and gearbox before use, this is done by running for 3-4 minutes continuously in both directions (polarity one way then the other) under no load. This ensures that all of the gears and bearings are running freely before being subjected to loading.


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, with copper and nickel plating
Gearbox type:Planetary/epicyclic. The 13.7:1 gearbox has two reduction stages and the 188:1 gearbox has four transmission stages.
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 ball-bearings
Weight:Excluding optional leads
 With 13.7:1 gearbox: 760g
 With 188:1 gearbox: 980g



Operating Characteristics with 13.7:1 ratio gearbox

at 6V DC:
at 12V DC:
at 18V DC:
No-load speed:7000rpm14000rpm21040rpm
No-load speed after gearbox:511rpm1022rpm1536rpm
No-load current:1.6A2.0A2.4A
Maximum efficiency torque:5kg-cm
10kg-cm
15kg-cm
Maximum efficiency current:
5A11A16A
Maximum efficiency output:19.5W85.8W
215W
Stall torque after gearbox:
39.7kg-cm79.3kg-cm119kg-cm
Stall current:34.7A*
69.4A*
104A*
Speed after gearbox at maximum power:255rpm511rpm768rpm
Torque after gearbox at maximum power:
19.9kg-cm39.7kg-cm59.5kg-cm

*Warning: Avoid reaching stall, the motor will quickly overheat in this condition

Please be aware that some of these values are extrapolated and there will be a small degree of variance from motor to motor, as a rule-of-thumb allow for 5% above/below the given values. Be sure that any power and control equipment that you use with the motor is capable of handling the large currents that it can require to operate.



Operating Characteristics with 188:1 ratio gearbox

at 6V DC:
at 12V DC:
at 18V DC:
No-load speed:7000rpm14000rpm21040rpm
No-load speed after gearbox:36rpm73rpm108rpm
No-load current:1.6A2.4A3.4A
Motor stall torque:284m-Nm, 2.90kg-cm
568m-Nm, 5.79kg-cm
852m-Nm, 8.69kg-cm
Stall torque after gearbox:
382kg-cm, 37.5Nm*763kg-cm, 74.8Nm*1141kg-cm, 112Nm*
Stall current:34.7A
69.4A
104A
Maximum sustained gearbox torque:150kg-cm (14.7Nm)150kg-cm (14.7Nm)150kg-cm (14.7Nm)
Current for maximum sustained torque:
15.7A15.7A15.7A
Output speed at maximum torque:26rpm63rpm100rpm
Current for maximum peak torque:
26.2A26.2A26.2A

*Warning: Do not allow this motor and gearbox combination to exceed 250kg-cm (24.5Nm) at the output, loads greater than this will permanently damage the gearbox. If limiting the input current to protect the gearbox then ensure that it is kept below the maximum values given above for both sustained and peak loading.  

Please be aware that some of these values are extrapolated and there will be a small degree of variance from motor to motor, as a rule-of-thumb allow for 5% above/below the given values. Be sure that any power and control equipment that you use with the motor is capable of handling the large currents that it can require to operate.

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