Stepper motor 28BYGH

two-phase steppertwo-phase24 V

Overview
The 28BYGH series is a 1.8° two-phase open-loop stepper motor manufactured by Shanghai Siheng Motor Manufacturing Co., Ltd. It is available in six model variants. Typical position error: ±0.09°. Key electrical and mechanical parameters vary by model to meet different industrial application requirements.

Models

• Six variants available (example: 28BYGH232-0674).

Electrical and performance characteristics

• Step angle: 1.8° (typical position error ±0.09°).
• Rated voltage: 2.66–6.2 V (model-dependent).
• Rated current: 0.67–0.95 A (model-dependent).
• Drive type: constant current drive (24 V recommended supply for driver).
• Excitation: 2-phase.
• Holding torque: 0.43–1.2 kg·cm (depending on model).

Mechanical characteristics

• Motor length: approximately 32–51 mm (model-dependent).
• Weight: approximately 110–200 g (model-dependent).
• Shaft diameter: 5 mm.
• Mounting: 4-M2.5 mounting holes (see dimensional drawings).

Insulation and safety

• Insulation class: Class B.
• Insulation voltage: 500 V.
• Insulation resistance: 100 Ω.

Wiring and excitation sequence

• Wiring color codes: BLK / GREEN = Phase A, RED / BLUE = Phase B.
• Standard 2-phase excitation sequences are provided.

Performance charts and documentation
Torque-speed curves and other performance graphs are included to assist selection and application design.

Installation drawings
Detailed dimensional drawings are provided, including mounting hole pattern (4-M2.5), shaft diameter (5 mm) and overall motor length options. Refer to drawings for precise measurements per model.

Technical specifications

• Series: 28BYGH series.
• Step angle: 1.8° (±0.09° typical).
• Models available: 6 variants (e.g., 28BYGH232-0674).
• Rated voltage: 2.66–6.2 V.
• Rated current: 0.67–0.95 A.
• Holding torque: 0.43–1.2 kg·cm.
• Drive method: constant current drive (24 V driver supply typical).
• Excitation: 2-phase.
• Insulation class: B; insulation voltage: 500 V; insulation resistance: 100 Ω.
• Motor lengths: approx. 32–51 mm.
• Weight: approx. 110–200 g.
• Shaft diameter: 5 mm.
• Mounting holes: 4-M2.5.
• Includes torque-speed curves and color-coded wiring definitions.