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YFROBOT

YFROBOT Metal Gearmotor GA25 12V with 13 CPR Encoder Hall speed measurement

YFROBOT Metal Gearmotor GA25 12V with 13 CPR Encoder Hall speed measurement

Regular price $30.00 USD
Regular price Sale price $30.00 USD
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Ratio

Overview:

These brushed DC gearmotors have a diameter of 25mm (0.984 inches), with all versions available with an integrated quadrature encoder on the motor shaft. The 12V motors provide roughly the same performance at their respective rated voltages.Its motor shaft is a 4mm D-shaft.

These motors can typically be run at voltages above and below their rated voltage, with lower voltages being less practical and higher voltages beginning to have a negative impact on the motor's lifespan.

The gearboxes are primarily made up of spur gears, but their first stage uses helical gears to reduce noise and increase efficiency.

Using the Encoder:

A dual-channel Hall effect encoder is used to detect the rotation of a disk on the back of the motor shaft. The quadrature encoder provides a resolution of 52 counts per motor shaft revolution by calculating two counts for each edge between the two channels. To calculate the counts per revolution of the gearbox output, multiply the gear ratio by 52. The motor/encoder has six colored, 8-inch (20 cm) leads with a 1×6 female header on the end with a 0.1″ spacing, as shown in the main product picture. The header pins can be used with a plug. If this plug is not convenient for your application, you can pull the wires out of the plug or cut off the plug. The table below describes the function of each wire.

Color Function
Red motor power (connects to one motor terminal)
Black motor power (connects to the other motor terminal)
Green encoder GND
Blue encoder Vcc (3.5 – 5 V)
Yellow encoder A output
White encoder B output

 

The Hall sensor requires an input voltage Vcc between 3.5 and 20V, with a maximum current of 10 milliamps. The A and B outputs are square waves that are approximately 90° out of phase, with a voltage range of 0V to Vcc. The transition frequency tells you the speed of the motor, while the transition sequence tells you the direction.

The oscilloscope capture shown above displays the A and B (yellow and white) encoder outputs for a 12V motor and a 5V Hall sensor Vcc. By calculating the rising and falling edges of the A and B outputs, 52 counts are obtained for each motor shaft. Using a single edge from only one channel would result in 13 counts per motor shaft, so the frequency of the A output in the above oscilloscope capture is 13 times the rotational frequency of the motor.

Precautions

  • This product does not have waterproof function, and it is strictly prohibited to use in water or damp environments.
  • Short circuit between positive and negative poles is prohibited.
  • Obtain information through email. 

Motor parameters

Gear   ratio 1:xx

Rated voltage (V)

No-load  speed (rpm/min)

Load speed (rpm/min)

Rated torque (kg.cm)

Current rating (mA)

Load  torque (kg.cm)

Stall current   (mA)

1:34

6

147

118

0.75

500

4

2100

12

294

236

1.4

650

5.2

2200

1:75

6

66

57

1.5

650

8

2100

12

133

115

2.6

650

10

2200

 

Electrical characteristics

Specification

Symbol

Test Condition

Min

Typical

Max

Unit

Input Voltage

Vcc

--

2.7

5

5.5

V

Output Saturation Voltage

Vce(sat)

VCC=14V; IC=20mA

-

300

700

mV

Output Leakage Current

Icex

VCC=14V; VCC=14V

-

<0.1

10

A

Input Current

Ice

VCC=20V, output open

-

5

10

mA

Output Rise Time

Tr

VCC=14V; RH=820Ω;CH=20pF

-

0.3

1.5

S

Output Fall Time

Tr

VCC=14V; RL=820Ω;CL=20pF

-

0.3

1.5

S

Operating Temperature Range

Topr

 

0-85

 

Installation method

 

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