JGA25-370 DC Gear Motor with Hall Encoder, 12V/24V, 12–1364 RPM, 25mm Metal Gearbox and 4mm D-Shaft

JGA25-370 Brushed DC Gear Motor with Hall Encoder

The JGA25-370 is a compact brushed DC gear motor with a metal reduction gearbox, a 4mm D-shaped output shaft and an incremental Hall encoder for speed feedback. Choose a 12V or 24V motor, the required no-load output speed, and a motor-only or accessory package for robotics, small mechanisms and electronics projects.

The selectable speeds are 12, 16, 27, 35, 58, 77, 128, 169, 282, 625 and 1364 RPM. These options match the supplier's 6000RPM motor-before-reduction series. Output RPM is measured without load; speed decreases under load. A bracket shown in a photograph is included only when the selected Package names a bracket.

Construction and Speed Control

• Metal reduction gears in a multi-stage arrangement, copper winding, permanent-magnet motor and carbon brushes.
• PWM speed control is possible with a compatible external brushed-DC controller. A controller is included only in the specified packages.
• Swap only the red and white motor leads to reverse rotation; keep encoder supply polarity correct. With a controller fitted, use its direction control and keep controller supply polarity correct.
• The gear ratio determines the speed/torque trade-off. Reducing speed electrically does not provide the same torque increase as selecting a higher reduction ratio.

Mechanical Specifications

Dimensions are supplier reference measurements and may vary. Motor appearance and components can differ between versions. The source overview lists 6V/24V, while the actual selectable variants are 12V/24V. The 6V performance table below is reference-only and does not create a 6V purchase option.

Performance by Voltage and Gear Ratio

Output speeds below are no-load speeds. Loaded speeds and torque are listed at the supplier maximum-efficiency operating point. Values are supplier data, not independent test results. Torque is in kgf·cm, not kilograms of lifting capacity. Stall values are limits, not continuous operating ratings.

6V — 6000RPM Before Reduction (Reference Only; Not Selectable)

12V — 6000RPM Before Reduction

24V — 6000RPM Before Reduction

Optional Mounting Bracket

The illustrated L-bracket is 3mm thick and 26.2mm wide, with a 33.5mm base and 33.5mm upright. Its motor face has two 3.5mm mounting holes with 6mm recesses, at 17mm spacing, and an 8mm centre opening positioned 13mm below the top. The base drawing shows four 3.5mm holes at 14 × 16mm spacing, an 8mm side reference, a 7mm centre offset and a 10mm centre opening. The bracket is supplied only with the applicable Package.

Hall Encoder and Wiring

The magnetic incremental encoder provides AB square-wave feedback: 11 pulses per motor revolution on each signal, with 22 magnetic poles (11 pairs). Each channel produces 11 × gear ratio pulses per output-shaft revolution. When counting complete pulses on one channel, output RPM = frequency in Hz × 60 ÷ (11 × gear ratio). Quadrature edge-counting requires the corresponding counting multiplier; this is incremental feedback, not an absolute position sensor.

Use a DC motor supply matching the selected voltage. Never apply 12V/24V to the encoder supply or signal wires. Keep encoder polarity correct when reversing the motor. With a compatible controller, connect its motor output to the motor leads and follow the actual controller labels. Stop before reversing direction.

Choose the motor by its rated-load torque rather than its stall torque. Do not overload, stall or operate close to stall: the motor or gears can be damaged. Loads above the rated condition reduce speed. Lowering electrical speed can also reduce available torque. Controller ratings, adapter mains-input rating, plug type and included cable/connector details are not fully specified in the supplied listing; verify these details for the selected accessories.

Package Contents

One JGA25-370 encoder motor with the illustrated encoder lead in the selected voltage and speed, plus only the accessories named in the Package option:

• Motor Only
• Motor + Bracket
• Motor + Speed Controller
• Motor + Power Supply
• Motor + Bracket + Speed Controller
• Motor + Bracket + Power Supply
• Motor + Speed Controller + Power Supply
• Motor + Bracket + Speed Controller + Power Supply

Motor Only does not include a bracket, speed controller or power supply. Product and accessory illustrations are reference views.

Details

English versions of the supplier illustrations, with explanations and series-specific reference notes.

Motor Dimensions

Dimensions are in millimetres. The motor drawing shows a 24 ±0.5mm diameter body, 31mm body length and 8.7mm rear encoder extension. Gearbox length L depends on reduction ratio.

Optional Mounting Bracket

The 3mm-thick bracket is included only when named in the selected Package. Check the 17mm motor mounting spacing and base hole pattern.

Motor Overview and Shaft Dimensions

The supplier overview lists 6V/24V, but this product offers only the 12V and 24V options shown in the selector. Motor weight is approximately 93–100g by ratio; dimensions are supplier reference values.

Encoder Wiring and Feedback

Connect the encoder to 3.3–5V only. Red and white are motor leads; blue is encoder positive and black is encoder ground. Green and yellow are feedback channels. Each provides 11 pulses per motor revolution, multiplied by gearbox ratio at the output shaft.