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MFA 4.5-15V Large 100:1 Single Ratio Planetary Gearbox

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About this product


  • Large motor with integral planetary (epicyclic) gearbox
  • Great for heavy duty industrial use, hobbies and model applications
  • Operating voltage between 4.5V and 15V

Product overview

• Large motor with integral planetary (epicyclic) gearbox
• Great for heavy duty industrial use, hobbies and model applications
• Operating voltage between 4.5V and 15V
• Output ratio of 100:1
• Rotations per minute of up to 141
• Creates torque up to 4704gf.cm

What ratio is this motor gearbox?

The motor with its integrated 100:1 planetary gearbox can get up to 4704gf.cm (gram-force cm) ,the equivalent of 0.461Nm, at maximum efficiency (12V) with a rotary speed of 141 rotations per minute. The motor runs off a DC power supply between 1.5 and 145 volts and reversing the polarity of the input with charge the direction the motor spins in. 77.1mm long (94.1 mm including shaft) with a diameter of 32mm and weighing 214g, this is a great motor for modelling or industrial applications.

Why use planetary motor gearbox?

Planetary gearboxes can be half the size of a conventional gearbox and more efficient, allowing smaller motors to be used for the same output. Planetary or epicyclic gearing involves one or more planet gears rotating around a sun gear and an outer ring. The planet gears are often mounted on a carrier that rotates relative to the sun gear.

The motor gearbox can be used in heavy duty industrial, hobby or model applications. It has a five pole motor with sintered bronze bearings, and sleeved bearings on the metal gearbox, allowing high torque transfers from the motor through the gearbox. The built-in gearbox can increase your turning power (torque) at a reduced rotations per minute from the motor. The optimum ratio for this will depend on your project. Powered by a DC power supply, the motor gearbox outputs to a 6mm shaft to connect to your project.

(Motor speeds may vary by ±12.5%)


Manufacturer part code 940D1001
Supply voltage DC 4.5 V - 15 V
Speed at Max efficiency 141 rpm @ 15 V
Speed at other voltages 112 rpm @ 12 V
83 rpm @ 9 V
55 rpm @ 6 V
40 rpm @ 4.5
Current at max efficiency 0.99 A @ 12 V
Output power at max efficiency 7.98 W @ 12 V
Torque 4704 gf.cm (0.461 Nm) @ 12 V
Gearbox ratio 100:1
Shaft diameter 6 mm
Weight 214 g
Dimensions 32 mm x 32 mm x 77.1 mm (94.1 mm including shaft)

Can the rotation of the motor be reversed by changing the supply polarity or by other means?

Asked by: Mike
Answer to self. Yes it can. RTBIP (Read the information provided)
Answered by: Mike
Date published: 2017-05-26

MFA 4.5-15V Large 100:1 Single Ratio Planetary Gearbox - Can you suggest a suitable variable speed controller for this motor 

Asked by: Terry
As much as we would love to be able to help here, we cannot offer design project advice or assistance, we are more than happy to locate products and support you with your purchases but we are not able to design entire circuits or projects for you. If you do have the design/circuit information detailing the value of the components needed we will be happy to locate these for you.
Answered by: Billy
Date published: 2016-07-17

Hello Can you send me the datasheet for: MFA 4.5-15V Large 100:1 Single Ratio Planetary Gearbox Thanks

Asked by: Maplin
There is a Data sheet available on our website for the item, Under the main image in our downloads section.
Answered by: Darren
Date published: 2015-11-06

What is the lowest RPM motor that you sell?

Asked by: Josh
The lowest RPM motor we have would be http://www.maplin.co.uk/p/1-rpm-mains-powered-mirror-ball-motor-r63bt
Answered by: Les
Date published: 2015-07-17

What is the highest input rpm that this gearbox can operate at?

Asked by: innov8tor
This motor model number is the 940D1001 Using the information from the datasheet provided on the listing, this would give a max RPM of 141 RPM @ 15.0v
Answered by: Les
Date published: 2015-07-17


Asked by: ROBCOLL
Yes this motor will work at 12v.
Answered by: Dominic
Date published: 2015-07-17

What is the datasheet of this motor? Watts, current, weight....

Asked by: loola
I have sent you the datasheet by email, if anyone else would like a copy please request this from technical@maplin.co.uk
Answered by: Russell
Date published: 2015-07-17
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