This is a merged information page for Item #999.
View normal product page.
Pololu item #:
999
Brand:
Pololu
Status:
Active and Preferred
This is a miniature brushed DC metal gearmotor with a gearbox cross section of 10×12 mm and a 9 mm long, 3 mm diameter D-shaped gearbox output shaft.
motor/brush type | gearbox | encoder | |
---|---|---|---|
HP 6V: high-power 6V with precious metal brushes | 9.96:1 with brass plates | no encoder |
voltage | no-load performance | stall extrapolation* |
---|---|---|
6 V | 3100 RPM, 100 mA | 0.22 kg⋅cm (3.1 oz⋅in), 1.6 A |
* Note: Stall torque and stall current specifications are theoretical values; stalls could damage the motor or gearbox. |
Alternatives available with variations in these parameter(s): gear ratio motor type encoder Select variant…
Compare all products in 6V High-Power (HP) Micro Metal Gearmotors.
Micro Metal Gearmotor next to a US quarter dollar for size reference. |
---|
Micro Metal Gearmotor (standard version without encoder or extended motor shaft). |
---|
Micro Metal Gearmotor with extended motor shaft. |
---|
Micro Metal Gearmotor with 12 CPR encoder, back connector (cable not included). |
---|
Micro Metal Gearmotor with 12 CPR encoder, side connector (cable not included). |
---|
Micro Metal Gearmotor HPCB with long-life carbon brushes (left) next to one with precious metal brushes. |
---|
Micro Metal Gearmotor HPCB long-life carbon brushes (left) next to Micro Metal Gearmotor HP precious metal brushes (right). |
---|
Micro Metal Gearmotor size comparison of 1000:1 (bottom) vs other gear ratios (top). |
---|
Black Pololu Wheel 70×8mm on a Pololu Micro Metal Gearmotor. |
---|
Black Pololu Wheel 90×10mm on a Pololu Micro Metal Gearmotor. |
---|
Pololu Wheel 32×7mm on a Micro Metal Gearmotor. |
---|
12mm Hex Wheel Adapter for 3mm Shaft on a Micro Metal Gearmotor. |
---|
Micro Metal Gearmotor mounted to a piece of acrylic with black mounting bracket version. |
---|
Micro Metal Gearmotor mounted to a piece of acrylic with black mounting bracket version. |
---|
Pololu micro metal gearmotor bracket extended with Micro Metal Gearmotor. |
---|
Pololu micro metal gearmotor bracket extended with Micro Metal Gearmotor. |
---|
37D mm Metal Gearmotor next to a Micro Metal Gearmotor for size comparison. |
---|
Our Micro Metal Gearmotor family consists of tiny brushed DC metal gearmotors with nitride-hardened martensitic stainless steel gears in a wide range of gear ratios, motor windings, brushes, and encoder configurations:
Micro Metal Gearmotor next to a US quarter dollar for size reference. |
---|
Gear ratio options | Motor winding/brush options | Encoder options |
---|---|---|
|
|
|
The following comparison table shows basic specifications for all of the available versions (see the Micro Metal Gearmotor datasheet (5MB pdf) for additional information, including detailed performance graphs):
Rated Voltage |
Stall Current |
No-Load Current |
No-Load Speed (RPM) |
Extrapolated Stall Torque |
Max Power (W) |
Approx Gear Ratio |
No Encoder |
w/ Extended Motor Shaft |
w/ Encoder, Back Conn. |
w/ Encoder, Side Conn. |
|
---|---|---|---|---|---|---|---|---|---|---|---|
(kg⋅cm) | (oz⋅in) | ||||||||||
HPCB 12V (high-power, carbon brushes) |
|||||||||||
12 V | 0.75 A | 100 mA | 6800 | 0.09 | 1.3 | – | 5:1 | #3036 | #3047 | #5204 | #5205 |
80 mA | 3400 | 0.17 | 2.4 | 1.5 | 10:1 | #3037 | #3048 | #5206 | #5207 | ||
2200 | 0.25 | 3.5 | 1.4 | 15:1 | #4788 | #4789 | #5208 | #5209 | |||
1100 | 0.39 | 5.4 | 1.1 | 30:1 | #3038 | #3049 | #5210 | #5211 | |||
650 | 0.67 | 9.3 | 1.1 | 50:1 | #3039 | #3050 | #5212 | #5213 | |||
450 | 1.0 | 14 | 1.1 | 75:1 | #3040 | #3051 | #5214 | #5215 | |||
330 | 1.3 | 18 | 1.1 | 100:1 | #3041 | #3052 | #5216 | #5217 | |||
220 | 1.8 | 25 | 1.0 | 150:1 | #3042 | #3053 | #5218 | #5219 | |||
160 | 2.5 | 35 | 1.0 | 210:1 | #3043 | #3054 | #5220 | #5221 | |||
130 | 3.0 | 42 | 1.1 | 250:1 | #3044 | #3055 | #5222 | #5223 | |||
110 | 3.3 | 46 | 1.0 | 298:1 | #3045 | #3056 | #5224 | #5225 | |||
85 | 5.0 | 69 | 1.1 | 380:1 | #4798 | #4799 | #5226 | #5227 | |||
35 | 10 | 140 | – | 1000:1 | #3046 | #3057 | #5228 | #5229 | |||
Rated Voltage |
Stall Current |
No-Load Current |
No-Load Speed (RPM) |
Extrapolated Stall Torque |
Max Power (W) |
Approx Gear Ratio |
No Encoder | w/ Extended Motor Shaft |
w/ Encoder, Back Conn. |
w/ Encoder, Side Conn. |
|
(kg⋅cm) | (oz⋅in) | ||||||||||
HPCB 6V (high-power, carbon brushes) |
|||||||||||
6 V | 1.5 A | 170 mA | 6500 | 0.09 | 1.3 | – | 5:1 | #3060 | #3082 | #5178 | #5179 |
150 mA | 3300 | 0.17 | 2.4 | 1.3 | 10:1 | #3061 | #3071 | #5180 | #5181 | ||
2100 | 0.25 | 3.5 | 1.3 | 15:1 | #4786 | #4787 | #5182 | #5183 | |||
1100 | 0.45 | 6.2 | 1.2 | 30:1 | #3062 | #3072 | #5184 | #5185 | |||
650 | 0.74 | 10 | 1.2 | 50:1 | #3063 | #3073 | #5186 | #5187 | |||
430 | 1.1 | 15 | 1.3 | 75:1 | #3064 | #3074 | #5188 | #5189 | |||
330 | 1.6 | 22 | 1.3 | 100:1 | #3065 | #3075 | #5190 | #5191 | |||
220 | 2.0 | 28 | 1.1 | 150:1 | #3066 | #3076 | #5192 | #5193 | |||
160 | 2.8 | 39 | 1.1 | 210:1 | #3067 | #3077 | #5194 | #5195 | |||
130 | 3.2 | 44 | 1.1 | 250:1 | #3068 | #3078 | #5196 | #5197 | |||
110 | 3.4 | 47 | 1.0 | 298:1 | #3069 | #3079 | #5198 | #5199 | |||
85 | 5.0 | 69 | 1.1 | 380:1 | #4796 | #4797 | #5200 | #5201 | |||
33 | 11 | 150 | – | 1000:1 | #3070 | #3080 | #5202 | #5203 | |||
Rated Voltage |
Stall Current |
No-Load Current |
No-Load Speed (RPM) |
Extrapolated Stall Torque |
Max Power (W) |
Approx Gear Ratio |
No Encoder | w/ Extended Motor Shaft |
w/ Encoder, Back Conn. |
w/ Encoder, Side Conn. |
|
(kg⋅cm) | (oz⋅in) | ||||||||||
HP 6V (high-power) |
|||||||||||
6 V | 1.6 A | 120 mA | 6100 | 0.11 | 1.5 | – | 5:1 | #1000 | #2210 | #5152 | #5153 |
100 mA | 3100 | 0.22 | 3.0 | 1.6 | 10:1 | #999 | #2211 | #5154 | #5155 | ||
2000 | 0.30 | 4.2 | 1.5 | 15:1 | #4784 | #4785 | #5156 | #5157 | |||
1000 | 0.57 | 7.9 | 1.5 | 30:1 | #1093 | #2212 | #5158 | #5159 | |||
590 | 0.86 | 12 | 1.3 | 50:1 | #998 | #2213 | #5160 | #5161 | |||
410 | 1.3 | 18 | 1.4 | 75:1 | #2361 | #2215 | #5162 | #5163 | |||
310 | 1.7 | 24 | 1.3 | 100:1 | #1101 | #2214 | #5164 | #5165 | |||
210 | 2.4 | 33 | 1.2 | 150:1 | #997 | #2386 | #5166 | #5167 | |||
150 | 3.0 | 42 | 1.1 | 210:1 | #996 | #2216 | #5168 | #5169 | |||
120 | 3.4 | 47 | 1.1 | 250:1 | #995 | #2217 | #5170 | #5171 | |||
100 | 4.0 | 56 | 1.1 | 298:1 | #994 | #2218 | #5172 | #5173 | |||
84 | 5.5 | 76 | 1.1 | 380:1 | #4794 | #4795 | #5174 | #5175 | |||
31 | 12 | 170 | – | 1000:1 | #1595 | #2373 | #5176 | #5177 | |||
Rated Voltage |
Stall Current |
No-Load Current |
No-Load Speed (RPM) |
Extrapolated Stall Torque |
Max Power (W) |
Approx Gear Ratio |
No Encoder | w/ Extended Motor Shaft |
w/ Encoder, Back Conn. |
w/ Encoder, Side Conn. |
|
(kg⋅cm) | (oz⋅in) | ||||||||||
MP 6V (medium-power) |
|||||||||||
6 V | 0.67 A | 80 mA | 4400 | 0.06 | 0.8 | – | 5:1 | #2362 | #2376 | #5126 | #5127 |
70 mA | 2200 | 0.11 | 1.5 | – | 10:1 | #2363 | #2377 | #5128 | #5129 | ||
1400 | 0.20 | 2.8 | 0.70 | 15:1 | #4782 | #4783 | #5130 | #5131 | |||
720 | 0.33 | 4.6 | 0.57 | 30:1 | #2364 | #2378 | #5132 | #5133 | |||
420 | 0.54 | 7.5 | 0.55 | 50:1 | #2365 | #2379 | #5134 | #5135 | |||
290 | 0.78 | 11 | 0.54 | 75:1 | #2366 | #2380 | #5136 | #5137 | |||
220 | 0.94 | 13 | 0.50 | 100:1 | #2367 | #2381 | #5138 | #5139 | |||
150 | 1.3 | 18 | 0.48 | 150:1 | #2368 | #2382 | #5140 | #5141 | |||
100 | 1.7 | 24 | 0.46 | 210:1 | #2369 | #2383 | #5142 | #5143 | |||
88 | 2.2 | 31 | 0.48 | 250:1 | #2370 | #2384 | #5144 | #5145 | |||
73 | 2.4 | 33 | 0.44 | 298:1 | #2371 | #2385 | #5146 | #5147 | |||
57 | 3.6 | 50 | 0.53 | 380:1 | #4792 | #4793 | #5148 | #5149 | |||
22 | 6.7 | 93 | – | 1000:1 | #2372 | #3059 | #5150 | #5151 | |||
Rated Voltage |
Stall Current |
No-Load Current |
No-Load Speed (RPM) |
Extrapolated Stall Torque |
Max Power (W) |
Approx Gear Ratio |
No Encoder | w/ Extended Motor Shaft |
w/ Encoder, Back Conn. |
w/ Encoder, Side Conn. |
|
(kg⋅cm) | (oz⋅in) | ||||||||||
LP 6V (low-power) |
|||||||||||
6 V | 0.36 A | 50 mA | 2500 | 0.05 | 0.7 | – | 5:1 | #1100 | #2200 | #5100 | #5101 |
40 mA | 1300 | 0.10 | 1.4 | – | 10:1 | #1099 | #2201 | #5102 | #5103 | ||
860 | 0.17 | 2.4 | 0.37 | 15:1 | #4780 | #4781 | #5104 | #5105 | |||
450 | 0.29 | 4.0 | 0.31 | 30:1 | #993 | #2202 | #5106 | #5107 | |||
270 | 0.44 | 6.1 | 0.29 | 50:1 | #1098 | #2203 | #5108 | #5109 | |||
180 | 0.64 | 8.9 | 0.29 | 75:1 | #2360 | #2209 | #5110 | #5111 | |||
130 | 0.74 | 10 | 0.25 | 100:1 | #992 | #2204 | #5112 | #5113 | |||
90 | 1.1 | 15 | 0.25 | 150:1 | #1097 | #2205 | #5114 | #5115 | |||
65 | 1.6 | 22 | 0.25 | 210:1 | #1096 | #2206 | #5116 | #5117 | |||
54 | 1.7 | 24 | 0.23 | 250:1 | #1095 | #2207 | #5118 | #5119 | |||
45 | 2.0 | 28 | 0.22 | 298:1 | #1094 | #2208 | #5120 | #5121 | |||
36 | 2.9 | 40 | 0.27 | 380:1 | #4790 | #4791 | #5122 | #5123 | |||
13 | 5.5 | 76 | – | 1000:1 | #1596 | #3058 | #5124 | #5125 |
Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The recommended upper limit for instantaneous torque is 2.5 kg⋅cm (35 oz⋅in) for the 380:1 and 1000:1 gearboxes, and 2 kg⋅cm (25 oz⋅in) for all the other gear ratios; we strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP and HPCB) motors; a general recommendation for brushed DC motor operation is 25% or less of the stall current.
In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
The 6V and 12V HPCB motors have long-life carbon brushes, and they offer the same performance at their respective nominal voltages, just with the 12 V motor drawing half the current of the 6 V motor. The 6V HP, MP, and LP motors have shorter-life precious metal brushes, which are generally lower-friction than carbon brushes and preferred for lower-current applications. The HPCB versions (shown on the left in the picture below) can be differentiated from versions with precious metal brushes (shown on the right) by their copper-colored terminals. Note that the HPCB terminals are 0.5 mm wider than those on the other Micro Metal Gearmotor versions (2 mm vs. 1.5 mm), and they are about 1 mm closer together (6 mm vs. 7 mm).
Micro Metal Gearmotor HPCB long-life carbon brushes (left) next to Micro Metal Gearmotor HP precious metal brushes (right). |
---|
In addition to standard versions that are not intended for use with encoders, we have versions of our Micro Metal Gearmotors available with integrated 12 CPR quadrature encoders on the motor shafts (i.e. on the inputs to the gearbox). These are available in two styles—back connector and side connector—and work with our assortment of 6-pin JST SH-style cables and 6-pin JST SH-style connector boards (cables are not included). A plastic snap-on housing covers the encoder disc and electronics.
We also have motor versions available with an extended motor shaft for adding your own encoder. This 1 mm diameter shaft extends 4.5 mm from the rear of the motor and rotates at the same speed as the input to the gearbox. These versions work with our separately available encoders for Micro Metal Gearmotors.
The table below shows the exact gear ratios for our Micro Metal Gearmotors. All gearboxes have the same overall dimensions except for 1000:1, which is 3.5 mm longer than the others. The gearboxes use brass plates on all versions except 380:1, which has steel plates for increased durability and resistance to wear from radial loads.
Please note that the higher gear ratios can generate enough torque to damage themselves if exposed to loads beyond what they are rated for (25 kg⋅mm for 1000:1 and 380:1, 20 kg⋅mm for everything else). The point of these higher gear ratios is not to deliver more overall torque but rather to allow for slower speeds at a given voltage and to draw less current for a given torque within its rated operating range.
Our Micro Metal Gearmotors all have gearboxes with a 10 × 12 mm cross section and a 9 mm-long, 3 mm-diameter D-shaped gearbox output shaft. The gearbox length is the same for all gear ratios except 1000:1, which is 3.5 mm longer than the others. On versions without an encoder, the motor fits entirely within the 10 × 12 mm gearbox cross section. The two encoder options fit within the gearbox cross section on the side opposite the connector and extend past it by 3 mm or 4 mm on the connector side, depending on the connector orientation; for the other two sides, the encoder extends past the gearbox cross section by 0.25 mm.
In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are sometimes also referred to as N20 motors. The versions with carbon brushes (HPCB) have slightly different terminal and end-cap dimensions than the versions with precious metal brushes, but all of the other dimensions are identical.
See our detailed dimension diagrams (635k pdf) for more information.
Micro Metal Gearmotor (standard version without encoder or extended motor shaft). |
---|
motor/brush type | gearbox | encoder | |
---|---|---|---|
HP 6V: high-power 6V with precious metal brushes | 9.96:1 with brass plates | no encoder |
voltage | no-load performance | stall extrapolation* |
---|---|---|
6 V | 3100 RPM, 100 mA | 0.22 kg⋅cm (3.1 oz⋅in), 1.6 A |
* Note: Stall torque and stall current specifications are theoretical values; stalls could damage the motor or gearbox. |
Exact gear ratio: ``(35×37) / (13×10) ~~ bb(9.96:1)``
Pololu Wheel 32×7mm on a Micro Metal Gearmotor. |
---|
Black Pololu Wheel 70×8mm on a Pololu Micro Metal Gearmotor. |
---|
A pair of Pololu universal aluminum mounting hubs for 3 mm diameter shafts. |
---|
12mm Hex Wheel Adapter for 3mm Shaft on a Micro Metal Gearmotor. |
---|
Black micro metal gearmotor mounting bracket pair with included screws and nuts. |
---|
White micro metal gearmotor mounting bracket pair with included screws and nuts. |
---|
Pololu micro metal gearmotor bracket extended with Micro Metal Gearmotor. |
---|
MP6550 Single Brushed DC Motor Driver Carrier. |
---|
Motoron M1T550/M1U550 Single Motor Controller (Header Pins Soldered). |
---|
Motoron M2T550/M2U550 Dual Motor Controller (Header Pins Soldered). |
---|
Three Motoron M3S550 shields being controlled by an Arduino Uno. |
---|
ACS724LLCTR-2P5AB Current Sensor Carrier -2.5A to +2.5A. |
---|
We also incorporate these motors into some of our products, including our Zumo robot and 3pi robot :
Size: | 10 × 12 × 25 mm1 |
---|---|
Weight: | 9.5 g |
Shaft diameter: | 3 mm2 |
Gear ratio: | 9.96:1 |
---|---|
No-load speed @ 6V: | 3100 rpm3 |
No-load current @ 6V: | 0.10 A4 |
Stall current @ 6V: | 1.6 A |
Stall torque @ 6V: | 0.22 kg·cm |
Max output power @ 6V: | 1.6 W |
Encoder: | no encoder |
Motor type: | 1.6A stall @ 6V (HP 6V) |
Max efficiency @ 6V: | 43 % |
---|---|
Speed at max efficiency: | 2300 rpm |
Torque at max efficiency: | 0.046 kg·cm |
Current at max efficiency: | 0.42 A |
Output power at max efficiency: | 1.1 W |
This file contains 3D models (in the step file format) of the for the various versions of the Micro Metal Gearmotors.
No FAQs available.
This excellent guide from C.I.r.E. (Club de Informática, robótica y Electrónica) shows in detail how to build a fast (> 2 m/s) line-following...