CHIHAI GM25-BLDC2430 Brushless Gear Motor

Overview

The CHIHAI MOTOR CHR-GM25-BLDC2430 is a25 mm brushless DC gear motor with metal reduction gears, an internal Hall drive board and five power/control leads. Choose the12V or24V motor, reduction ratio and motor-only, bracket or BLDC speed-controller package.

Features

Brushless motor with copper winding and onboard Hall commutation electronics.
Metal gear reduction with a4 mm D-shaped output shaft.
PWM speed command, direction command and separate FG pulse output.
Four packages with optional mounting bracket and speed-control board.

Specifications

Item	Specification
Model	CHR-GM25-BLDC2430 / GM25-BL2430
Motor	Brushless DC gear motor with internal Hall drive electronics
Selected operating voltage	12V or24V DC; match the selected motor
Nominal power reference	Approximately6 W; operating values depend on voltage, ratio and load
Gearbox diameter	25 mm
Motor body	24.4 mm diameter;30.8 mm can-length drawing reference
Output shaft	4 mm D-shaft;12 +/-0.5 mm projection;8 mm flat length
Shaft fitting drawing	4 mm diameter+0/-0.03 mm;3.5 mm flat dimension+0/-0.1 mm
Front mount	Two M3 tapped holes,17 mm spacing reference
Gearbox length L	19-27 mm by ratio; tolerance+/-0.3 mm
Mass reference	Approximately95 g; varies by configuration
Cable	Five-wire power and control lead set
Control	PWM speed input, CW/CCW direction input and FG Hall pulse output

Gear Ratio and Length

Reference ratio	Gearbox L (mm)
4.4:1	19
9.3:1	19
20:1	19
34:1	21
45:1	21
75:1	23
100:1	23
125:1	25
217:1	25
362:1	27
478:1	27

The362:1 column is a family reference and is not a selectable combination here. Body length varies with reduction ratio; shaft projection is separate from gearbox length.

Electrical and Torque Performance

Values apply to the stated voltage and reduction ratio. No-load, rated and stall conditions are distinct. Do not operate stalled or treat the maximum9 kgf·cm limit as a continuous torque rating.

12V

No-load current ≤130 mA; rated current ≤0.50 A; stall current ≤1.3 A.

Ratio	No-load rpm	Rated torque kgf·cm	Rated rpm	Stall / maximum torque kgf·cm
4.4:1	1350	0.3	1100	>=0.5
9.3:1	640	0.6	500	>=1.0
20:1	300	1.2	235	>=2.0
34:1	185	2	143	>=3.0
45:1	130	2.5	110	>=4.5
75:1	80	4.5	64	>=7.0
100:1	60	6	49	Maximum9.0
125:1	48	7.5	39	Maximum9.0
217:1	27	8	22	Maximum9.0
362:1	16.5	8	13	Maximum9.0
478:1	12.5	8	10	Maximum9.0

24V

No-load current ≤180 mA; rated current ≤0.80 A; stall current ≤1.6 A.

Ratio	No-load rpm	Rated torque kgf·cm	Rated rpm	Stall / maximum torque kgf·cm
4.4:1	2700	0.5	2200	>=1.0
9.3:1	1280	1	1000	>=2.0
20:1	600	2	470	>=4.0
34:1	370	4	285	>=6.0
45:1	260	5	220	Maximum9.0
75:1	160	8	130	Maximum9.0
100:1	120	8	100	Maximum9.0
125:1	95	8	85	Maximum9.0
217:1	54	8	46	Maximum9.0
362:1	33	8	28	Maximum9.0
478:1	25	8	22	Maximum9.0

Power, Direction and PWM Wiring

Wire	Signal	Electrical function
Red	Vm / VCC+	Motor power at selected12V or24V DC; not a5V logic supply
Black	GND	Power/control ground
Yellow	CW/CCW	0-5V direction input; highCCW, lowCW; high threshold2.0V min, low0.5V max
Green	FG	Hall pulse output;6pulses/cycle reference; high6V max, low0.5V max, signal-current reference2mA
Blue	PWM	0-5V active-low control; typical15-25kHz, maximum60kHz; high or openOFF, lowON; thresholds2.0V min/0.5V max

Keep motor supply voltage away from the0-5V PWM and direction inputs. Observe power polarity; reverse supply can damage the internal electronics. The motor contains its commutation drive, so its five wires are not three raw motor-phase leads. FG is a pulse output for a compatible external measurement circuit; it is not an absolute position encoder or a promise of closed-loop operation.

Optional BLDC Speed Controller

The illustrated board power range is6-30V DC; use the motor-selected12V or24V supply. It must not be connected directly to household AC mains. In the speed-control configuration, connect as follows:

Board connection	Wiring
Board V+ / V-	Appropriate DC power supply positive / negative
Motor VCC+	Motor red wire
Motor GND-	Motor black wire
CW/CCW	Motor yellow direction wire
PWM	Motor blue control wire
BRAKE	Leave unconnected in speed-control wiring
FG green	Leave unconnected to this speed-controller board; it does not measure FG speed

The supplied controller does not read the motor FG signal. Leave the green wire isolated from the board and leave BRAKE unconnected in this configuration. Do not assume an emergency-stop or braking function is provided by this motor-and-board combination. Board switches can control speed/direction only where the connected motor supports the corresponding input.

Bracket and Packages

Package	Included
Motor Only	One selected motor and five-wire lead set
Motor + Bracket	One motor, lead set and mounting bracket
Motor + BLDC Speed Controller	One motor, lead set and BLDC speed controller
Motor + Bracket + BLDC Controller	One motor, lead set, mounting bracket and BLDC speed controller

The bracket drawing includes a26.5 mm motor opening,33 mm upright reference,26.5 mm base reference and3 mm material thickness. Confirm all mounting dimensions against the drawing before fabrication. Couplings, wheels, power supply and a complete mechanism are not included.

Applications

Use the selected motor for robot mechanisms, electronic locks, automatic rotary equipment and small positioning platforms with suitable external controls. Match voltage, load and operating speed; avoid overload and prolonged stall.

What's Included

One selected motor with its power/control leads. A bracket and BLDC speed controller are included only when named in the package. The controller package does not include a power supply or FG speed-measurement module.

FAQ

Does the motor need an external three-phase driver?

Its Hall commutation drive is built in. Use the documented DC power and logic/control inputs; the optional board provides a convenient speed-control interface.