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

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

Custom options are also available, please contact us for more information

The GR-EP-45E is a 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 or 188:1 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 provided further down the page.

Each gearmotor assembly is 45mm in diameter with overall (motor & gearbox together) lengths of 148mm with the 19.2:1 gearbox, 159mm with the 99.5:1 gearbox, or 171mm with the 188:1 or 369:1 gearbox. The output shaft is 10mm diameter, with a 4mm wide slot for easy mounting. 

 

£48.80
£48.80
(each, exc VAT)

Availability: IN STOCK

SKU: GR-EP-45E_19.2
This model of gearmotor is able to provide sufficient torque for many automation and special effects projects without requring large power supplies and control hardware. It is more powerful than most common 'hobby' gearmotors of 25mm or 36mm size, and yet not so powerful as to demand very high currents to operate. Another benefit of this model is that the relatively low motor speed (6000rpm no-load at 12V) generates lower noise levels than more-powerful motors of the same size, which usually generate their power with very high rpms (upwards of 20,000rpm for some drill 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), the 188:1 increases the torque further, 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.
  
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 or 1000mm long silicone-insulated leads (1mm2) to be installed (soldered directly 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. If you require a custom wiring or control option please contact us to discuss specifications and pricing. 
 
  
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). This is usually done via a control switch or controller, for example our rocker switch harness or GR-MOT1 control units.
  
You should fit circuit protection to protect both the motor from stalling/overheating and your power source from overload. At a minimum this would be a fuse in series with a motor, but you might want to fit a more sophisticated protection device such as the GR-SENS instead.
  
Make sure to read the performance tables for your selected gearbox option further down this page, so that you have an understanding of the torque, current and speed that you can expect from the motor. If you're unsure about selecting the appropriate motor for the task please send details of your application to us and we'll guide you through the options. 
 
  
Compliance
These motors adhere to RoHS limits (UKCA declaration of conformity is available upon request). EMC compliance should be assessed/tested for in the end application since these motors are generic components whose electrical characteristics, including radiated emissions, are very dependent upon the power source, controller, wiring, load and operating environment/housing. 
  
  
  
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 188:1 and 369:1 gearboxes. 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.
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
Output shaft
10mm by 24mm long (exposed length) steel shaft, 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 optional lead additions
With 19.2:1 gearbox: 750g
With 99.5:1 gearbox: 860g
With 369:1 gearbox: 980g
  
  
 
Operating characteristics, 19.2:1 ratio (values at output from gearbox)
 
at 12V DC
at 6V DC
No-load speed
312rpm
156rpm
No-load current
0.8A
0.7A
Continuous rated torque, speed
7.4kg-cm, 271rpm
3.7kg-cm, 135rpm
Continuous current
3.5A
2.1A
Continuous output power
20W
5.0W
Max. power torque, speed
24kg-cm, 156rpm
12kg-cm, 78rpm
Max. power current
9.7A
5.0A
Stall torque
48kg-cm
24kg-cm
Stall current
18.6A
9.3A
  

The breaking (maximum rated) output torque of the 19.2:1 ratio gearbox is 180kg-cm, be careful to avoid shock/impact loads that could exceed this.
Please be aware that some of the values above are extrapolated from other measurements and it's normal for there to be a small degree of variance from motor to motor, you should allow for a safety factor of at least 10% above/below the given values when designing for your application. The output figures provided are based upon an average 81% gearbox efficiency for the 19.2:1 ratio gearbox. 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, whilst also being able to limit the current to protect the motor in the event of it stalling.

 
Operating characteristics, 99.5:1 ratio (values at output from gearbox)
 
at 12V DC
at 6V DC
No-load speed
60rpm
30rpm
No-load current
0.8A
0.7A
Continuous rated torque, speed
35kg-cm, 50rpm
17kg-cm, 25rpm
Continuous current
3.5A
2.1A
Continuous output power
18W
4.5W
Max. power torque, speed
113kg-cm, 30rpm
56kg-cm, 15rpm
Max. power current
9.7A
5.0A
Stall torque
227kg-cm
114kg-cm
Stall current
18.6A
9.3A
  

The breaking (maximum rated) output torque of the 99.5:1 ratio gearbox is 300kg-cm, be careful to avoid shock/impact loads that could exceed this.
Please be aware that some of the values above are extrapolated from other measurements and it's normal for there to be a small degree of variance from motor to motor, you should allow for a safety factor of at least 10% above/below the given values when designing for your application. The output figures provided are based upon an average 73% gearbox efficiency for the 99.5:1 ratio gearbox. 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, whilst also being able to limit the current to protect the motor in the event of it stalling.

 
Operating characteristics, 188:1 ratio (values at output from gearbox)
 
at 12V DC
at 6V DC
No-load speed
32rpm
16rpm
No-load current
0.8A
0.7A
Continuous rated torque, speed
58kg-cm, 28rpm
29kg-cm, 14rpm
Continuous current
3.5A
2.1A
Continuous output power
16W
4.0W
Max. power torque, speed
192kg-cm, 16rpm
95kg-cm, 8.0rpm
Max. power current
9.7A
5.0A
Stall torque
383kg-cm
191kg-cm
Stall current
(18.6A)
9.3A
Breaking current
17A
-
  

The breaking (maximum rated) output torque of the 188:1 ratio gearbox is 300kg-cm. Ensure that the motor output is limited to well below the values highlighted in red, to prevent the motor from damaging itself by this maximum load.
Please be aware that some of the values above are extrapolated from other measurements and it's normal for there to be a small degree of variance from motor to motor, you should allow for a safety factor of at least 10% above/below the given values when designing for your application. The output figures provided are based upon an average 65% gearbox efficiency for the 188:1 ratio gearbox. 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, whilst also being able to limit the current to protect the motor in the event of it stalling.

 
Operating characteristics, 369:1 ratio (values at output from gearbox)
 
at 12V DC
at 6V DC
No-load speed
16rpm
8.1rpm
No-load current
0.8A
0.7A
Continuous rated torque, speed
114kg-cm, 14rpm
57kg-cm, 6.8rpm
Continuous current
3.5A
2.1A
Continuous output power
16W
4.0W
Max. power torque, speed
375kg-cm, 8.1rpm
187kg-cm, 4.1rpm
Max. power current
(9.7A)
5.0A
Stall torque
750kg-cm
375kg-cm
Stall current
(18.6A)
(9.3A)
Breaking current
9A
9A
  

The breaking (maximum rated) output torque of the 369:1 ratio gearbox is 300kg-cm. Ensure that the motor output is limited to well below the values highlighted in red, to prevent the motor from damaging itself by exceeding this maximum load.
Please be aware that some of the values above are extrapolated from other measurements and it's normal for there to be a small degree of variance from motor to motor, you should allow for a safety factor of at least 10% above/below the given values when designing for your application. The output figures provided are based upon an average 65% gearbox efficiency for the 369:1 ratio gearbox. 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, whilst also being able to limit the current to protect the motor in the event of it stalling.

  
 

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