CHIHAI GM1024-10BY M4 Geared Stepper Motor, 55mm

Overview

The CHIHAI MOTOR CHF-GM1024-10BY-M4/55 is a miniature two-phase geared stepper motor with an open metal gear frame and a55mm M4×0.7 threaded output shaft. Choose a50:1–500:1 ratio and the required motor, flange-nut or driver package for compact positioning mechanisms.

Package Guide

Motor Only contains one threaded-shaft motor. Motor + Flange Nut adds one matching flanged nut. Motor + Driver Board adds one bare stepper driver. Motor + Enclosed Driver includes the driver and its enclosure. Motor + Flange Nut + Driver adds the flange nut and bare driver. A power supply, linear guide and application mechanism are not included.

The threaded shaft rotates; linear motion requires a matching nut constrained against rotation and a suitable guide. The flange nut is included only in the selected nut package. No axial-load rating or complete linear actuator is promised.

Dimensions and Construction

Parameter	Reference
Model	CHF-GM1024-10BY-M4/55
Motor diameter	10mm
Threaded shaft	M4×0.7,55mm projection
Gear frame	10±0.1mm width,24±0.3mm length;9mm frame thickness reference
Assembly height reference	15.5mm at motor, excluding the long threaded shaft
Mounting	2×M1.6×0.35 tapped holes;12±0.2mm spacing reference
Lead	75±10mm;1.25mm-pitch4-pin connector; UL1571 AWG30 reference
Motor net mass	Approximately15g

5V Motor Performance Reference

Two-phase, four-wire bipolar motor;5V/L6219 driver reference. Phase current128mA, phase resistance39Ω±7%, phase inductance14.3mH. Speed below is gearbox output at1000 input pulses per second.

Ratio	Output step	Output rpm at1000pps	Holding kgf·cm	Pull-out kgf·cm
50	0.36°	60	0.60	0.18
100	0.18°	30	1.10	0.30
150	0.12°	20	1.60	0.45
200	0.09°	15	2.00	0.60
350	0.051°	8.5	3.0 max	1.00
500	0.036°	6	3.0 max	1.50

For350:1 and500:1,3.0kgf·cm is the maximum permissible holding load, not a guaranteed minimum or continuous running torque. Avoid overload and stalled operation. Starting/response frequency references are>1200pps/>900pps; validate the actual driver, load and acceleration profile.

Drive-Test Operating References

The following full-step tests apply to the motor input before reduction with39Ω windings and a non-current-limiting test arrangement. Divide motor rpm by the actual ratio for output rpm. They do not replace the5V winding reference or establish an unrestricted continuous supply range. Higher pulse frequency reduces available output torque.

Test voltage	Upper Hz	Motor rpm	Current A	Lower Hz	Motor rpm	Current A	Holding0Hz A
6V	1400	4200	≤0.12	800	2400	≤0.18	≤0.30
5V	1300	3900	≤0.085	700	2100	≤0.155	≤0.25
3.7V	800	2400	≤0.085	500	1500	≤0.125	≤0.19

Winding Connection and Optional Driver

Use a compatible bipolar two-phase stepper driver. Winding pairs are White–Red and Brown–Black. White=A+,Red=A−,Brown=B+,Black=B− in the illustrated connection reference. Connector pin numbering must be verified on the actual assembly; do not infer it solely from wire order. Do not apply DC across arbitrary connector pins.

The optional driver has a different supply range from the motor winding: yellow jumper fitted,6–18V board input; jumper removed,4–6V. Recommended board input is6–12V in the corresponding jumper arrangement. Configure the driver for the motor and confirm the supplied board's instructions before powering. Do not connect the driver's input voltage directly to the5V motor winding as though it were a plain DC motor.

Disconnect power before changing wiring or jumpers. Keep gears and the rotating threaded shaft guarded. Avoid forced back-driving, overload and continuous stalled operation.

Applications

The small frame, geared output steps and threaded shaft suit miniature positioning mechanisms, camera tracking projects, compact robot mechanisms and small instrument prototypes. Actual accuracy depends on backlash, the nut/guide arrangement and the controller; no encoder feedback is included.

What's Included

One selected-ratio M4 threaded-shaft motor plus only the flange nut, bare driver or enclosed driver named in the chosen package. Other illustrated motors and application equipment are not included.