CHIHAI CHR-GM37-520 Optical Encoder DC Gear Motor, 448 CPR, 12V/24V
CHIHAI CHR-GM37-520 Optical Encoder DC Gear Motor, 448 CPR, 12V/24V
CHIHAI MOTOR
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Overview
The CHIHAI MOTOR CHR-GM37-520 DC gear motor combines an all-metal reduction gearbox with a 448 CPR optical encoder for feedback-equipped robot drives and compact mechanisms. Select the package, reduction ratio and 12V or 24V winding. This is the optical-disc version; its feedback interface differs from Hall encoder models.
Features
- Metal gears, copper armature winding and forward/reverse brushed motor operation.
- 6mm D shaft and six front tapped mounting holes.
- AB quadrature optical feedback with protective rear cover and matching lead.
- Motor-only, bracket, flange-coupling and 65mm/80mm wheel packages.
Specifications
| Brand / model | CHIHAI MOTOR / CHR-GM37-520, optical encoder version |
| Motor | Brushed DC motor, metal reduction gears and copper winding; separate 12V and 24V selectable windings |
| Encoder | AB quadrature incremental optical disc encoder; base 448 CPR at motor shaft; output reference 448 x actual gear reduction |
| Logic supply | 3.3V DC or 5.0V DC, separate from motor voltage; never reverse VCC/GND or exceed 5V |
| Response / environment | 25â60kHz response reference; source operating environment 0â85 degrees C |
| Connector | PH2.0-6PIN on motor; supplied harness terminates in pictured Dupont or XH2.54 connection |
| Compatibility | Source recommends STM32-class MCU with hardware encoder interface; states Arduino/51 not supported for this configuration |
| Shaft | 6mm diameter, tolerance +0/-0.03mm; D flat 5.4mm +0/-0.1mm; 21±0.5mm projection and 12mm flat length |
| Mechanical references | 37mm gearbox, diameter12mm front boss, 6mm shoulder; motor 36.2mm REF, 23mm section, 1.8mm rear feature and 41.7mm rear envelope |
| Mounting | Six M3.0 x 3 tapped holes, 31mm pitch-circle diameter, 60-degree spacing; drawing 7mm reference |
| Gearbox length | L±0.3mm; 19/19/21.5/21.5/24/24/26.5/26.5/29mm across ascending ratios |
| Net mass | Approximately 150g motor reference; ratio and package vary |
12V and 24V Performance
The two source tables give the same speed and torque points below for their respective windings. Selector labels round 6.3:1 to 6:1 and 18.8:1 to 18:1. These labels are retained as source choices; the engineering table gives the detailed ratio reference. No-load speed and rated speed are different operating points.
| Engineering ratio :1 | No-load rpm | Rated rpm | Rated kgf.cm | Rated N.m | Stall kgf.cm | Gearbox L mm |
|---|---|---|---|---|---|---|
| 6.3 | 1530 | 850 | 0.6 | 0.06 | 1.2 | 19 |
| 10 | 960 | 540 | 1 | 0.1 | 2 | 19 |
| 18.8 | 510 | 285 | 1.8 | 0.18 | 4 | 21.5 |
| 30 | 320 | 180 | 3 | 0.3 | 6 | 21.5 |
| 50 | 192 | 105 | 4.8 | 0.48 | 10 | 24 |
| 90 | 107 | 60 | 8.5 | 0.85 | 17 | 24 |
| 150 | 64 | 36 | 14.5 | 1.4 | 25 | 26.5 |
| 270 | 35 | 20 | 20 | 2 | 35 | 26.5 |
| 450 | 21 | 14 | 25 | 2.5 | 35 | 29 |
24V: maximum output-power reference 12W; no-load current â€100mA, rated current â€0.95A, stall current â€2.5A. 12V: maximum output-power reference 7W; no-load current â€160mA, rated current â€1.2A, stall current â€3.5A. Stall values are not continuous ratings; avoid overload and stalled operation.
6V Family Reference Only
The source also supplies the following 6V family reference. There are no 6V variants in these retail options. Maximum output-power reference 2W; no-load â€100mA, rated â€0.35A, stall â€1.7A.
| Engineering ratio :1 | No-load rpm | Rated rpm | Rated kgf.cm | Rated N.m | Stall kgf.cm |
|---|---|---|---|---|---|
| 6.3 | 760 | 570 | 0.2 | 0.02 | 0.7 |
| 10 | 480 | 360 | 0.3 | 0.03 | 1 |
| 18.8 | 205 | 192 | 0.6 | 0.06 | 1.9 |
| 30 | 160 | 120 | 1 | 0.1 | 3 |
| 50 | 95 | 72 | 3 | 0.3 | 5.5 |
| 90 | 53 | 40 | 4.8 | 0.48 | 9 |
| 150 | 32 | 24 | 8.6 | 0.86 | 16 |
| 270 | 18 | 13 | 14 | 1.4 | 30 |
| 450 | 10 | 8 | 20 | 2 | 35 |
Optical Encoder Connection
| Wire color | Function |
|---|---|
| Red | B phase output |
| Black | A phase output |
| Green | Encoder GND |
| Blue | Encoder VCC, 3.3V / 5V |
| Yellow | Motor positive |
| White | Motor negative |
Red and black are encoder signal outputs, not motor power. Yellow and white are motor power. Keep motor voltage separate from the blue 3.3V/5V logic supply and green logic ground. Do not reverse encoder VCC/GND or apply motor voltage to encoder pins. Verify the marked connector orientation before energizing. The base specification is 448 CPR; gearbox output counts scale with actual reduction and the receiving decoder convention. No additional x4 resolution is claimed.
The source specifies a hardware encoder interface such as STM32 and states Arduino/51 are not supported for this configuration. Check input levels, hardware count rate and decoding support before selecting a controller. A processor, motor driver and feedback controller are not included.
Package Contents
| Selected package | Included items |
|---|---|
| Encoder Motor Only | One optical encoder motor, rear cover and connecting lead. |
| Motor + Bracket | One encoder motor/lead and one mounting bracket. |
| Motor + Bracket + Flange Coupling | One encoder motor/lead, bracket and flange coupling. |
| Motor + 65mm Wheel Kit | One encoder motor/lead, bracket, hex coupling, one 65mm wheel and pictured mounting hardware. |
| Motor + 80mm Wheel Kit | One encoder motor/lead, bracket, hex coupling, one 80mm wheel and pictured mounting hardware. |
Package illustrations identify alternatives, not multiple motors. The wheel kits show alternative tread/color examples; this listing has no separate tread or color selector. The selected diameter identifies the kit; a particular tread/color is not guaranteed. The 65mm reference shows high-friction and flat-wheel examples; the 80mm reference shows flat-wheel and high-friction examples. A complete chassis or robot is not included.
Mounting and Use
The bracket drawing references 40mm front width, 43mm foot length, 30mm by 24mm base-hole spacing, 3mm material thickness, diameter13mm central front opening and six diameter3.2mm front holes on a 31mm circle. Additional bracket references:47mm height,14mm slot section,18.5mm lower reference,8mm base-hole offset,four diameter3.6mm base holes and R6.5 slot radius. Confirm the actual shaft, screw engagement, hole pattern and rear encoder clearance before installation. Do not let mounting screws contact internal gears. Stop before reversing direction, match the selected motor voltage, avoid overload and allow time to cool. Gear noise and available torque vary with speed and load.
Applications
Balancing-robot development, line-following vehicles, household robotics, camera jibs and motorized mechanisms where the selected rated torque, shaft, supply and feedback hardware meet the requirements. ROS or STM32 in the source title describes potential integration; software, a development board and a complete robot are not supplied.
FAQ
Is the encoder powered from 12V or 24V?
No. Its blue VCC lead needs 3.3V or 5V DC. The motor uses yellow/white leads at the selected nominal motor voltage.
Is 448 CPR the gearbox output count?
It is the base motor-shaft reference. Output counts depend on actual gear reduction and the decoder convention.
Does every package include a wheel?
Only the explicitly named 65mm and 80mm wheel kits include one wheel.
Visual Details
