Электронный магазин частей для минироботов Миниробо

Этот мощный мотор-редуктор размером 64х37х37 мм (2.54" x 1.45" x 1.45") состоит из металлического редуктора с передаточным отношением 29:1 и надежного мотора с напряжением питания 12 В. На вал мотора установлен энкодер с разрешением 64 импульса на оборот, что обеспечивает 1856 импульсов на один оборот выходного вала редуктора. Выходной вал: D-образный, диаметр 6 мм, длина 15,5 мм (0.61").

Основные характеристики при 12 В: 350 об/мин и 300 mA холостого хода, 8.0 kg-cm (110 oz-in) и 5.0 A ток опрокидывания.
 

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Gearmotor Options
This powerful gearmotor is available in six different gear ratios and features an integrated quadrature encoder with 64 counts per revolution (CPR) of the motor shaft. A version without the encoder is also available.

Gear Ratio	With Encoder	Without Encoder
19:1	Metal Gearmotor 37Dx52L mm	Metal Gearmotor 37Dx52L mm
29:1	Metal Gearmotor 37Dx52L mm	Metal Gearmotor 37Dx52L mm
50:1	Metal Gearmotor 37Dx54L mm	Metal Gearmotor 37Dx54L mm
67:1	Metal Gearmotor 37Dx54L mm	Metal Gearmotor 37Dx54L mm
100:1	Metal Gearmotor 37Dx57L mm	Metal Gearmotor 37Dx57L mm
122:1	Metal Gearmotor 37Dx57L mm	Metal Gearmotor 37Dx57L mm

These motors are intended for use at 12 V, though the motor can begin rotating at voltages as low as 1 V.

Gearmotor Dimensions
The face plate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighboring holes are 15.5 mm apart. You can use our custom 37D mm metal gearmotor bracket (shown in the left picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

Gearmotor with bracket and hub.

37D mm metal gear motor with 64 CPR encoder and Pololu 90×10mm wheel.

Please note that unlike our smaller metal gearmotors, these 37D mm gearmotors have output shafts with a diameter of 6 mm. The Pololu universal aluminum mounting hub for 6mm shafts can be used to mount our larger Pololu wheels (80mm- and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft (see the right picture above).

The diagram below shows the dimensions (in mm) of the 37D mm line of gearmotors. The value of X is 22 mm for the 19:1 37Dx52L mm and 29:1 37Dx52L mm versions, 24 mm for the 50:1 37Dx54L mm and 67:1 37Dx54L mm versions, and 26.5 mm for the 100:1 37Dx57L mm and 122:1 37Dx57L mm versions. Note that the encoder PCB and magnetic disc are not shown in this dimension diagram. The encoder assembly extends an additional 12.5 mm beyond the rear of the motor.

37D mm metal gearmotor dimensions (units in mm).

Warning : Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 3mm (1/8") into the screw hole.

Using the Encoder
A two-channel Hall effect encoder is used to sense the rotation of a magnetic disk on a rear protrusion of the motor shaft. The quadrature encoder provides a resolution of 64 counts per revolution of the motor shaft. To compute the counts per revolution of the gearbox output, multiply the gear ratio by 64. The motor/encoder has six color-coded, 11" (28 cm) leads:

Color - Function
Black - motor power
Red - motor power
Blue - Hall sensor Vcc (3.5 – 20 V)
Green - Hall sensor GND
Yellow - Hall sensor A output
White - Hall sensor B output

These leads have stripped, unterminated ends that can be soldered or crimped to make solder free connectors. The Hall sensor requires an input voltage, Vcc, between 3.5 and 20 V and draws a maximum of 10 mA. The A and B outputs are square waves from 0 V to Vcc approximately 90° out of phase. The frequency of the transitions tells you the speed of the motor, and the order of the transitions tells you the direction. The following oscilloscope capture shows the A and B (yellow and white) encoder outputs using a motor voltage of 12 V and a Hall sensor Vcc of 5 V: 

Encoder A and B outputs for 37D mm metal gearmotor with 64 CPR encoder (motor running at 12 V).

By counting both the rising and falling edges of both the A and B outputs, it is possible to get 64 counts per revolution of the motor shaft. Using just a single edge of one channel results in 16 counts per revolution of the motor shaft, so the frequency of the A output in the above oscilloscope capture is 16 times the motor rotation frequency.