CHIHAI CHS-15BY Miniature Stepper Motor, 5V, 1mm / 1.5mm Shaft
CHIHAI CHS-15BY Miniature Stepper Motor, 5V, 1mm / 1.5mm Shaft
CHIHAI MOTOR
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Overview
The CHIHAI MOTOR CHS-15BY is a miniature two-phase, four-wire permanent-magnet stepper motor for compact controlled motion. Select A with a 1.5 mm shaft and 10ohm winding, or B with a 1 mm shaft and nominal 30ohm winding. These are direct motor shafts without a reduction gearbox or encoder.
Features
- Compact round motor body with copper winding and small round output shaft.
- Two-phase step control and reversible motion through an external driver.
- Four-wire lead and matching miniature connector.
- Separate A/B winding and mounting specifications for correct integration.
Specifications - Version A
| Supply / winding | 5 V DC; two phases; 10Ω ±10% phase resistance |
| Excitation / direction | Two-phase-on(2-2); CCW reference, phase-sequence dependent |
| Insulation | ClassF |
| Frequency references | Maximum pull-out frequency at least 1500Hz; maximum pull-in frequency at least 100Hz |
| Pull-out torque | At least 12gf.cm at 1000Hz |
| Body / shaft | 15±0.1 mm body; 11 mm MAX body length; 1.5 mm shaft +0/-0.01 mm; 6.6±0.3 mm projection |
| Front drawing | 9.4±0.1 mm feature; two M 1.6x 0.35 tapped holes; 45degree reference; 4 mm front feature+0/-0.05 mm |
| Other drawing features | 0.5 mm front section, 0.6 mm rear feature and 5 mm rear circle |
| Harness | 150±10 mm, 30AWG 1571, four-pin 1.25 mm connector, UV adhesive fixation |
Specifications - Version B
| Supply / drive | 5 V DC with L 6219 driver; 160 mA per phase; bipolar, two-phase excitation |
| Resistance / input step | 31Ω ±7% per phase at 20°C; nominal 30ohm option; 18degrees per step |
| Pull-out torque | More than 8gf.cm at 500PPS |
| Frequency references | Maximum response more than 1000PPS; maximum starting more than 700PPS |
| Insulation / environment | ClassF; 100VAC one second; 100MΩ at 500VDC; operating reference-20 to+85°C, avoid condensation |
| Body / shaft | 15 mm body; 10.8 mm body reference; 1 mm shaft +0/-0.01 mm; 5.3±0.3 mm projection |
| Front mounting | Two M 1.4 holes on 9.4±0.1 mm spacing; 13.4 mm reference circle; 36degree reference |
| Other drawing features | 7.5 mm REF, 6.86 mm, 4 mm boss+0/-0.05 mm, 7 mm section, 1 mm and 0.5 mm references, 6.4 mm rear feature |
| Harness | 165±10 mm, UL 1571AWG 30; white 51021-0400/equivalent 1.25 mm single-row four-pin housing |
| Net mass | Approximately 10 g reference |
Pull-in/start frequency and pull-out/response frequency describe different operating limits. Torque values apply at the stated pulse rates and do not establish continuous load capability for every speed.
Version-Specific Wiring
A: 1.5 mm shaft, 10ohm
| Wire | Phase |
|---|---|
| Yellow | A |
| Black | A-bar |
| Red | B |
| White | B-bar |
CoilA uses yellow/black; coilB uses red/white. The A drawing shows connector order red, white, yellow, black; verify the marked viewing orientation before connecting.
B: 1 mm shaft, nominal 30ohm
| Wire | Phase |
|---|---|
| Black | A |
| Brown | A-bar |
| Red | B |
| White | B-bar |
CoilA uses black/brown; coilB uses red/white. The B connector table numbers brown 1, black 2, white 3, red 4. Color-to-phase function and connector pin position are separate references; use the actual marked connector orientation.
For two-phase-on drive, the phase sequence is A+B, A-bar+B, A-bar+B-bar, A+B-bar. Reverse the sequence to reverse direction. Rotation is referenced from the mounting/output-shaft side. Use a compatible bipolar stepper driver; do not power a coil directly as if it were a brushed DC motor. Disconnect power before changing wiring.
B-Winding Family Drive Reference
The following nominal 30ohm family guidance is separate from the B motor rating of 5 V/160 mA per phase. It is not a drive table for the A 10ohm winding. Apply current limiting and thermal checks appropriate to the selected driver and motor.
| Drive supply | Recommended frequency PPS/Hz | Recommended drive current |
|---|---|---|
| 12 V | 1000 | ≤0.25 A |
| 7.4 V | 1000 | ≤0.15 A |
| 6 V | 1000 | ≤0.10 A |
| 5 V | 1000 | ≤0.08 A |
| 3.7 V | 700 | ≤0.07 A |
Drive voltage must account for back EMF plus winding-current resistance drop. Long operation may require reduced current or external cooling if heating becomes excessive.
Mechanical Fit and General Tolerances
Choose the correct A/B shaft diameter, projection, mounting thread, hole spacing and cable envelope. Neither version has a D-flat shaft in this listing. The B drawing provides these general linear-tolerance classes in millimeters; explicit feature tolerances take precedence. No single tolerance class is assigned to every feature.
| Dimension Lmm | ClassA | ClassB | ClassC |
|---|---|---|---|
| L≤3 | ±0.02 | ±0.03 | ±0.05 |
| 3<L≤6 | ±0.05 | ±0.05 | ±0.08 |
| 6<L≤16 | ±0.07 | ±0.08 | ±0.10 |
| 16<L≤30 | ±0.10 | ±0.10 | ±0.12 |
| 30<L≤120 | ±0.10 | ±0.15 | ±0.18 |
| 120<L≤300 | ±0.15 | ±0.20 | ±0.25 |
| 300<L≤500 | ±0.20 | ±0.30 | ±0.40 |
Unspecified angular-tolerance reference:±0.1degree. Keep mounting screws clear of internal parts and provide shaft/load support as required by the mechanism.
Applications
Miniature robot mechanisms, small manipulators, smart-home motion controls, compact pan/tilt experiments and other low-load positioning projects where the selected shaft, winding, step rate and driver fit the application. A complete robotic hand, gimbal or mechanism is not included.
What's Included
One selected A or B CHS-15BY stepper motor with its pictured four-wire lead and connector. A motor driver, power supply, controller, encoder, gearbox, coupling and mounting bracket are not included.
FAQ
Are A and B electrically interchangeable?
No. Shaft size, winding resistance, mounting details and one phase-wire color differ. Use the selected version's table.
Does this include a reduction gearbox?
No. Both options are direct-shaft motors.
Can the 30ohm drive guidance be used for A?
No. It is scoped to the B nominal 30ohm winding family, not the A 10ohm motor.
Visual Details
