# Motors and Gearboxes

Motors and Gearboxes

## Motors and Gearboxes

When selecting a motor and gearbox, there are several important factors that you need to be aware of; The motor’s output torque, its current draw, its output speed, its power, and its efficiency.

### What is Torque?

A motor’s output torque is the amount of force with which its output shaft can rotate.  If too much torque is applied to a motor, its output shaft will stall, or stop turning.  Other motor characteristics are commonly written as a function of torque.  It is usually measured in N-m when metric units are required and oz-in when English units are required.

### Current Draw you say?

The motor’s current draw is the amount of electrical current the motor draws at any given load.  As the load on the motor (the torque) increases, the amount of current that the motor draws increases linearly.

### Speed says what?

The motor’s output speed is the rotational velocity at which the output shaft spins.  As the load on the motor increases, the output speed decreases linearly.

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• #### N20 DC Motor with Magnetic Encoder - 6V with Various Gear Ratio - Range

£13.50
N20 DC Motor with Magnetic Encoder - 6V with Various Gear Ratio - Range The first step in a robotics project is to get a motor spinning. Once you've done that you quickly learn that not all motors go the same speed, even if they are the same part number!...
£13.50
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• #### Micro Gearmotor, 10:1, 2600 RPM, 6-12V (ROB-12518)

Sparkfun

£13.25
Micro Gearmotor, 10:1, 2600 RPM, 6-12V - Sparkfun ROB-12518 Discontinued last chance to buy! These micro gearmotors are incredibly tough and feature full metal gears. They have a gear ratio of 10:1 and operate up to 12 volts and have a stall torque of 4...
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• #### Stamped Aluminum L-Bracket Pair for Plastic Gearmotors

£4.25
Stamped Aluminum L-Bracket Pair for Plastic Gearmotors These light-weight L-Brackets for Plastic Gearmotors  (approximately 2 or 2.5g each) are specifically designed for the larger Pololu plastic gearmotors (228:1 offset, 120:1 offset, 200:1...
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• #### 12V Metal Gearmotor 37D Range (With and Without 64 CPR Encoder)

£24.95 - £52.00
12V Metal Gearmotor 37D Range (With and Without 64 CPR Encoder) (Helical Pinion) These brushed DC Metal Gearmotors are the most powerful and largest you will find on our site. Coming in at a whopping 37mm (1.46") in diameter, they are available in a...
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• #### Mini PMDC Motor 3V 16kRPM

£1.00 - £2.00
Mini PMDC Motor 3V 16kRPM with or without mount The Mini PMDC Motor 3V 16kRPM operates at 3V. The Motor will run at 16,000 RPM ±10% with no load and 3V supplied. The 10mm shaft allows you to drive a variety of external components, you choose!NEW -...
£1.00 - £2.00
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• #### Vacuum Pump 12 v - ideal for Robotics!

Sparkfun

£20.00
12V Vacuum Pump, ideal for robotics! - Sparkfun ROB-10398 This vacuum pump operates at 12V  and has enough suction for most small projects. This pump is also perfect for your robotics projects - use it to make an automatic Lego picker-upper, like...
£20.00
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• #### Stepper Motor, 200 Steps, 2.3Kg.cm, Nema 16

Sparkfun

£20.50
Stepper Motor, 200 Steps, 2.3Kg.cm, Nema 16 This is a very powerful stepper motor with 200 Steps, holding torque of 2.3kg per cm, and a 4-wire cable attached.This is a Bipolar Motor. Nema 16 Stepper Specifications: Step Angle (degrees) :1.8 2...
£20.50
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• #### Stepper Motor, 48 Steps, Small, 100g.cm (ROB-10551)

Sparkfun

£8.50
Stepper Motor, 48 Steps, Small, 100g.cm - SparkFun ROB-10551 These small steppers are a great way to get things moving, especially when positioning and repeatability are a concern.This is a Bipolar motor with a holding torque of 100g per cm...
£8.50
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• #### Stepper Motor, 200 Steps, Threaded Shaft (ROB-10848)

Sparkfun

£52.80
Stepper Motor, 200 Steps, Threaded Shaft - SparkFun ROB-10848 These steppers have a threaded shaft, which allows them to be used as a linear actuator. As the motor runs, it moves along the shaft at a specific rate of 1cm per 5 full rotations.These are a...
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• #### Solenoid, Mini, Push-Pull, 5V, with JST Connector

Sparkfun

£6.00
Solenoid, Mini, Push-Pull, 5V, with JST Connector Solenoids are a great way to induce linear motion for pushing, pulling, or controlling switches and levers.This smaller solenoid is designed to work directly with 5V which makes it a great match for...
£6.00
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• #### Tamiya 70168 Double Gearbox Kit

Tamiya

£13.00
Tamiya 70168 Double Gearbox Kit The Tamiya double gearbox is a compact unit with two independent motors and gear trains. The kit includes two motors and all gears and parts to build any of the four possible gear ratio configurations (12.7:1, 38:1, 115:1,...
£13.00
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• #### 154:1 Metal Gearmotor 20Dx44L mm

Pololu

£16.00
154:1 Metal Gearmotor 20Dx44L mm Discontinued last chance to buy! This 1.72" x 0.79" x 0.79" gearmotor is a high-quality motor with 154:1 metal gearbox that has the power to deliver both speed and torque. These units have a 0.276"-long,...
£16.00
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