CHIHAI GW12T-050 Worm Gear Motor & Hall Encoder

Overview

The CHIHAI MOTOR CHF-GW12T-050 compact DC gear motor combines a right-angle metal worm gearbox with 6V or 12V winding choices and six reduction ratios. Choose the AB Hall encoder version with same-side or opposite-side motor terminals, or the rear-shaft motor without an encoder board.

Features

Compact metal reduction gearing and copper-wound motor armature.
Six output ratios from 42:1 to 1030:1 for speed and torque selection.
Encoder-equipped configurations provide two-phase A/B feedback for direction and rotation sensing.
3 mm D-shaped output shaft and compact mounting geometry.
Matching six-pin lead shown with encoder-equipped motor options.

Specifications

Brand / model	CHIHAI MOTOR / CHF-GW12T-050ABHL encoder family; rear-shaft motor option also offered
Motor supply	Select 6V or 12V DC winding; encoder supply is separate
Gear train	Metal worm and reduction gears; steel-plate construction explicitly listed on 42, 236, 302, 603 and 1030 ratios; 118 housing material not specified in selector
Reduction ratios	42:1, 118:1, 236:1, 302:1, 603:1, 1030:1
Output shaft	3 mm diameter (+0 / −0.03); 2.5 mm D-flat (+0 / −0.05); 8.0 ±0.3 mm projection
Reference dimensions	50.0 mm overall reference; 32.0 mm motor reference; 18.0 ×12.0 mm gear-plate reference
Drawing details	4.0 mm shaft-end offset; 8.50 mm mounting-hole spacing; 2 ×1.4 mm holes; 1.8 mm edge offset; 0.5 mm collar feature; 7.5 mm shoulder (+0.03 / 0)
Reference section	10.0 mm plate spacing; 11.8 mm external height; 15.5 mm diagonal reference; 18.5 mm encoder-board width
Reference motor mass	Approximately 25 g; ratio and configuration affect actual mass
Encoder type	AB dual-channel incremental magnetic Hall encoder, on encoder-equipped options only
Encoder supply	3.3V DC or 5.0V DC
Encoder connector	ZH1.5-6PIN, matching lead included with pictured encoder options
Encoder signal	A/B square-wave signals; onboard pull-up / signal-shaping resistors; connect to compatible MCU input levels
Encoder base pulses	7 PPR at motor shaft; output-shaft pulse reference = 7 × reduction ratio
Encoder magnetic ring	14 poles / 7 pole pairs
Encoder response frequency	100 kHz
Orientation choices	Same-side or opposite-side motor-terminal arrangement relative to output shaft, as pictured; not a commanded rotation direction
Rear-shaft option	Motor with a rear shaft and without the Hall encoder board shown on encoder-equipped options

Speed and Torque by Configuration

Use the table for the chosen winding and reduction ratio. Power references apply to the illustrated 11-size input motor: 0.55 W at 12V and 0.15 W at 6V. Speed, current and torque are different operating quantities; no-load speed is not rated load speed.

12V performance

Ratio	No-load rpm	Rated rpm	Rated kgf·cm	Rated N·m	Stall torque reference, kgf·cm
42:1	380	300	0.1	0.01	≤0.35
118:1	135	105	0.3	0.03	≤1.0
236:1	68	53	0.65	0.064	≥2.5
302:1	53	41	0.8	0.079	Not specified
603:1	27	20	1.6	0.16	Not specified
1030:1	16	12	2.4	0.24	Not specified

No-load current ≤85 mA; rated current ≤0.23 A; stall current ≤1.0 A.

6V performance

Ratio	No-load rpm	Rated rpm	Rated kgf·cm	Rated N·m	Stall torque reference, kgf·cm
42:1	190	140	0.05	0.005	≤0.17
118:1	67	50	0.15	0.015	≤0.5
236:1	33	25	0.32	0.031	≤1.2
302:1	26	20	0.4	0.039	≤1.50
603:1	13	10	0.8	0.079	Not specified
1030:1	8	6	1.2	0.12	Not specified

No-load current ≤65 mA; rated current ≤0.18 A; stall current ≤0.6 A.

Keep output load below 3 kgf·cm and avoid stalled operation. Stall references do not establish a continuous-duty rating. Ratios with no separate stall-torque figure use the same 3 kgf·cm mechanical load ceiling; this ceiling is not a promised stall torque.

Encoder Wiring

Wire colors follow this motor's six-wire lead, including red M− and white M+. Do not assume conventional red-positive wiring. Keep motor power separate from the 3.3V/5V Hall supply.

Wire	Marking	Function
Red	M−	Motor supply negative
Black	VCC	Encoder supply, 3.3V or 5.0V
Yellow	C2 / B	Encoder phase B
Green	C1 / A	Encoder phase A
Blue	GND	Encoder ground
White	M+	Motor supply positive

The encoder has 7 base pulses per motor revolution. The output-shaft pulse reference is 7 multiplied by the selected gearbox ratio; edge-counting conventions depend on the controller. Confirm logic-level compatibility before connection.

Configuration Guide

The orientation choices describe where the motor-terminal arrangement sits relative to the output shaft in the comparison photos; they do not select a fixed clockwise or counterclockwise command. The rear-shaft option is a motor without the Hall encoder board. Steel-plate ratios are labeled individually; the 118:1 option does not specify plate material. The steel/copper comparison is a family reference, not an additional material selector.

Applications

Small mobile robots using rotation feedback for wheel control, when the encoder option is selected.
Compact tracking mechanisms and camera-positioning assemblies requiring geared motion.
Small paper-handling and hobby automation mechanisms matched to the motor's torque, speed and duty cycle.

What's Included

One selected geared motor. Encoder-equipped selections include the pictured Hall encoder board and matching six-wire lead. The rear-shaft version has no encoder board; no encoder lead is implied. Driver, controller, power supply, wheels and complete robot or mechanism are not included. Comparison photos show alternatives, not a two-motor package.

FAQ

Does the rear-shaft option include an encoder?

No. Select an encoder-equipped same-side or opposite-side terminal option for A/B Hall feedback.

Can the Hall board be powered directly from 12V?

No. The encoder uses a separate 3.3V or 5.0V supply; the motor winding uses the selected 6V or 12V supply.

Is 7 PPR measured at the gearbox output?

No. It is the base motor-shaft pulse reference. Multiply by the reduction ratio for the output-shaft reference, then account for the controller's counting convention.