CHIHAI GM37-520 11 PPR Hall Encoder Gear Motor

Overview

The CHIHAI MOTOR CHR-GM37-520 ABHL is a 37 mm DC gear motor with an 11 PPR AB Hall encoder and a 6 mm D-shaped output shaft. Choose the connector and package, nominal motor voltage and gear ratio for robot drive mechanisms requiring speed or position feedback.

Features

All-metal reduction gears and copper motor winding.
Reversible brushed DC drive with separate AB encoder signals.
PH2.0, XH2.54 and covered XH2.54 encoder configurations.
Motor-only, mounting-bracket, 65 mm wheel and 80 mm wheel packages.

Specifications

Item	Specification
Model	CHR-GM37-520 ABHL / JGB37-520
Design	Brushed DC motor, metal reduction gears, copper winding, reversible rotation
Selectable motor supply	6V, 12V or 24V DC; match the selected version
Gearbox diameter	37 mm
Output shaft	6 mm D-shaft; 21 ± 0.5 mm projection; 12 mm flat length; flat dimension 5.4 +0/-0.1 mm
Motor body reference	32.8 mm diameter; 23 mm can length
Mounting	Six M3 tapped holes on 31 mm pitch circle; drawing includes 6-120° annotation; confirm hole orientation from drawing before machining
Net motor mass	Approximately 152 g; varies by ratio
Nominal ratio options	6:1, 10:1, 18:1, 30:1, 50:1, 90:1, 150:1, 270:1, 450:1
Encoder	AB incremental magnetic Hall, 11 PPR motor-shaft base resolution; 22 poles / 11 pole pairs
Encoder supply	Separate DC 3.3V or DC 5V
Output	AB square-wave signals, onboard pull-up/shaping resistors; response frequency100 kHz
Connections	PH2.0 six-pin, XH2.54 six-pin, or XH2.54 with encoder cover
Included cable	Matching six-wire connection lead set

Ratio and Mechanical References

The selector names 6:1 and 18:1 correspond to the 6.3:1 and 18.8:1 reference columns. Ratios are nominal; the 18.8:1 column lists 207 output pulses/revolution, a rounded reference. Decoder counts depend on edge-counting method.

Reference ratio	Gearbox length L (mm)	Output pulses/revolution
6.3	19	69.3
10	19	110
18.8	21.5	207
30	21.5	330
50	24	550
90	24	990
150	26.5	1650
270	26.5	2970
450	29	4950

Electrical Performance

Values apply to the named voltage and ratio. Rated and stall torque are distinct; do not operate stalled. Torque is not a payload rating. The kgf·cm and N·m columns are independently rounded reference values, not exact conversions.

24V

Maximum output power reference 12.0 W; no-load current ≤100 mA; rated current ≤0.95 A; stall current ≤2.5 A.

Ratio	No-load rpm	Rated kgf·cm	Rated N·m	Rated rpm	Stall kgf·cm
6.3:1	1530	0.6	0.06	850	1.2
10:1	960	1	0.1	540	2
18.8:1	510	1.8	0.18	285	4
30:1	320	3	0.3	180	6
50:1	192	4.8	0.48	105	10
90:1	107	8.5	0.85	60	17
150:1	64	14.5	1.4	36	25
270:1	35	20	2	20	35
450:1	21	25	2.5	14	35

12V

Maximum output power reference 7.0 W; no-load current ≤160 mA; rated current ≤1.2 A; stall current ≤3.5 A.

Ratio	No-load rpm	Rated kgf·cm	Rated N·m	Rated rpm	Stall kgf·cm
6.3:1	1530	0.6	0.06	850	1.2
10:1	960	1	0.1	540	2
18.8:1	510	1.8	0.18	285	4
30:1	320	3	0.3	180	6
50:1	192	4.8	0.48	105	10
90:1	107	8.5	0.85	60	17
150:1	64	14.5	1.4	36	25
270:1	35	20	2	20	35
450:1	21	25	2.5	14	35

6V

Maximum output power reference 2.0 W; no-load current ≤100 mA; rated current ≤0.35 A; stall current ≤1.7 A.

Ratio	No-load rpm	Rated kgf·cm	Rated N·m	Rated rpm	Stall kgf·cm
6.3:1	760	0.2	0.02	570	0.7
10:1	480	0.3	0.03	360	1
18.8:1	205	0.6	0.06	192	1.9
30:1	160	1	0.1	120	3
50:1	95	3	0.3	72	5.5
90:1	53	4.8	0.48	40	9
150:1	32	8.6	0.86	24	16
270:1	18	14	1.4	13	30
450:1	10	20	2	8	35

Wiring and Encoder Feedback

Use PCB labels and the matching connector orientation. The diagram terminal order is M1, GND, C2, C1, VCC, M2. M1/M2 power the motor at its selected voltage; reverse their polarity to reverse rotation. GND is encoder ground, C2 is channel B, C1 is channel A, and VCC is the separate 3.3V/5V encoder supply. Do not connect 12V or 24V motor power to encoder VCC. Wire colors and connector orientation vary between PH and XH configurations; do not assume a shared color pinout.

The 11 PPR figure is motor-shaft base resolution. Output-shaft pulses equal the base resolution multiplied by actual gear ratio; quadrature edge counts depend on the external decoder. A suitable external motor driver and feedback controller are required for closed-loop operation.

Wheel and Bracket Packages

The bracket option adds one mounting bracket. Wheel kits include the selected motor, one wheel, bracket, coupling and shown installation hardware. The 65 mm wheel reference is 27 mm wide; the 80 mm reference is 35 mm wide. Wheel artwork shows alternate tread/color examples; these are not separate selectable options and no specific tread or rim color is guaranteed. The 80 mm assembly photograph includes a bracket, although its parts are shown separately in the 65 mm photograph.

Applications

Self-balancing and differential-drive robot development using external control electronics.
Inspection carts, line-following robots and compact mobile platforms.
Camera positioning and powered lifting mechanisms within the selected motor ratings.

What's Included

One selected encoder gear motor and matching cable; add-on bracket or wheel-kit parts only as named in the selected package. A wheel kit is a single-motor kit, not a two-wheel robot set. Power supply, motor driver, encoder counter, controller and complete robot are not included.

Installation

Confirm the selected connector pin labels, shaft fit and mounting drawing before applying power or machining a mount. The covered motor has a different rear envelope. Avoid overload, sustained stall and forcing the output shaft.