GR-EP-45E Medium Power 45mm 12V Planetary Gearmotor


The GR-EP-45E is mid-powered 12V DC motor and planetary (epicyclic) gearbox combination, available with either a low-reduction high-speed 19.2:1 gearbox, a mid-range 99.5:1 gearbox, or a high-reduction low-speed 369:1 gearbox. 

The motor may be operated at anywhere between 3-12V DC, with a maximum continuous output power of 23W at 12V, and peak output of up to 43W. Operating characteristics are given for a range of voltages under the 'technical details' tab below.

Each gearmotor assembly is 45mm in diameter with overall (motor & gearbox) lengths of 148mm with the 19.2:1 gearbox, 159mm with the 99.5:1 gearbox, or 170.5mm with the 188:1 gearbox. The output shaft is 10mm diameter, with a 4mm wide slot for easy mounting. Please read on below for more specifications. 


£39.00 £46.80 inc VAT
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Quantity:
In Stock
Group SKU: GR-EP-45E

This model of gearmotor is able to provide sufficient torque for many automation and special effects projects without requring unusually large power supplies and control hardware. It is more powerful than most common 'hobby' gearmotors and yet not so powerful as to demand very high currents (for example its higher-powered brother the GR-EP-45 can demand up to 70A at 12V). Another benefit of this range is that the low motor speed generates relatively low noise levels over more powerful motors.

The 19.2:1 gearbox option provides a higher speed but lower torque output (313rpm no-load at 12V), the 99.5:1 option compromises between torque and speed (60rpm no-load), while the 369:1 sacrifices speed for a very high torque output (16.2rpm no-load). More operating details are available under Technical Details below. If you intend to operate the motor with a continuous load do not exceed the continuous torque ratings described for the different gearbox options, running at a higher torque than these ratings for extended periods of time could lead the motor to overheat.

The maximum allowable torque through the gearbox for any of the ratio options is 250kg-cm (24.5Nm) beyond which the gears may be damaged, be sure to fit either current limiting or output load limiting hardware if there is a danger that your application may try to exceed this load. 

Two copper tabs at the back of the motor body can be used to solder or crimp wires to (the tabs are suitable for 4.8mm female spade connectors). We offer an option for 500mm long silicone-insulated leads (1mm2) to be installed (soldered to the motor tabs) ready for use which can be selected above. Allow for one extra working day to process your order if a lead option is added, since this option is added to-order.


User advice

This motor operates like any other DC motor and so may be used at voltages other than the nominal 12V with changed operating characteristics (please be aware that the warranty does not cover operation above 12V which is likely to shorten the lifespan). Reducing the voltage reaching the motor will decrease the output speed and current for a given load, while increasing the voltage will increase the speed and the current. To change the direction of rotation 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.

Jump to section:    Motor Dimensions   —   Gearbox Build Detail   —   Operating Characteristics 19.2:1   —   Operating Characteristics 99.5:1   —   Operating Characteristics 369:1



Motor Dimensions

For the diagram below the dimension L is 45.5mm for the 19.2:1 gearbox, 56.5mm for the 99.5:1 gearbox and 68mm for the 369:1 gearbox. Please allow for +/-1mm on overall length. 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, with three 'planet' gears per stage on large carrier pins.
The 19.2:1 gearbox has two reduction stages, the 99.5:1 has three stages and the 369:1 has four gearbox stages.
Operating temperature:-5°C ~ +45°C
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 deep groove roller bearings (6900Z)
Weight:Excluding leads options
With 19.2:1 gearbox: 750g
With 99.5:1 gearbox: 860g
With 369:1 gearbox: 980g



Operating Characteristics with 19.2:1 ratio gearbox (values at output from gearbox)

at 6V DC:
at 12V DC:
No-load speed after gearbox:156rpm313rpm
No-load current:0.5A0.7A
Continuous rated torque, speed: 4.1kg-cm at 135rpm
8.3kg-cm at 271rpm
Continuous rated current:
1.8A3.5A
Continuous rated output power:5.68W23.1W
Maximum power torque, speed:13.5kg-cm at 78rpm27kg-cm at 156rpm
Maximum power current:4.9A9.8A
Maximum power output:
10.8W43.2W
Stall torque:
27kg-cm (2.94Nm)54kg-cm (5.88Nm)
Stall current:
9.3A*
18.6A*

*Warning: Avoid reaching stall by adding circuit or load protection, the motor will quickly overheat and be damaged if it is held in a stall condition

Please be aware that some of the values above are extrapolated from other measurements and there will be a small degree of variance from motor to motor, allow for a safety factor of 10% above/below the given values when designing for your application. 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.



Operating Characteristics with 99.5:1 ratio gearbox (values at output from gearbox)

at 6V DC:
at 12V DC:
No-load speed after gearbox:30rpm60rpm
No-load current:0.6A0.8A
Continuous rated torque, speed: 19kg-cm at 26rpm
38kg-cm at 52rpm
Continuous rated current:
1.8A3.5A
Continuous rated output power:5.07W20.3W
Maximum power torque, speed:62kg-cm at 15rpm124kg-cm at 30rpm
Maximum power current:5A9.9A
Maximum power output:
9.55W38.2W
Stall torque:
124kg-cm (12.2Nm)249kg-cm (24.4Nm)
Stall current:
9.3A*
18.6A*

*Warning: Avoid reaching stall by adding circuit or load protection, the motor will quickly overheat and be damaged if it is held in a stall condition

Please be aware that some of the values above are extrapolated from other measurements and there will be a small degree of variance from motor to motor, allow for a safety factor of 10% above/below the given values when designing for your application. 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.



Operating Characteristics with 369:1 ratio gearbox (values at output from gearbox)

at 6V DC:
at 12V DC:
No-load speed after gearbox:8.1rpm16.2rpm
No-load current:0.6A0.9A
Continuous rated torque, speed: 66.1kg-cm at 7.04rpm
132kg-cm at 14.1rpm
Continuous rated current:
1.8A3.5A
Continuous rated output power:4.78W19.1W
Maximum peak torque:
250kg-cm (24.5Nm)*
250kg-cm (24.5Nm)*
Current for maximum torque:
4.5A*
4.5A*

*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.

Please be aware that some of the values above are extrapolated from other measurements and there will be a small degree of variance from motor to motor, allow for a safety factor of 10% above/below the given values when designing for your application. 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.

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