





The YASKAWA SERVO MOTOR 400W SGMJV-04AAA21 is a cornerstone of the Sigma-7 series, delivering exceptional torque density and dynamic response for demanding automation tasks such as robotics, CNC machinery, packaging, and assembly lines. Engineered with a robust permanent magnet synchronous design, this motor ensures minimal cogging torque and smooth rotation even at low speeds. Its 20-bit encoder provides absolute position feedback, eliminating the need for homing sequences in many applications. The motor's compact frame (60 mm square) and lightweight construction (approx. 1.4 kg) allow for space-saving installation in tight machine layouts. With a rated current of 2.5 A and a maximum current of 7.5 A, the SGMJV-04AAA21 delivers consistent performance under variable loads. The motor features a self-cooling design (natural convection) and operates within an ambient temperature range of 0°C to 40°C, with storage down to -20°C. It supports both brake and non-brake variants, though the standard model (as indicated by the "A" in the suffix) comes without a holding brake. For safety, the motor includes thermal protection (PTC thermistor) and complies with CE, UL, and RoHS standards.
| Parameter | Specification |
|---|---|
| Model Number | SGMJV-04AAA21 |
| Rated Power | 400 W (0.4 kW) |
| Rated Torque | 1.27 N·m |
| Maximum Torque | 3.82 N·m |
| Rated Speed | 3000 min⁻¹ |
| Maximum Speed | 6000 min⁻¹ |
| Rated Current | 2.5 A (RMS) |
| Maximum Current | 7.5 A (RMS) |
| Rotor Inertia | 0.217 × 10⁻⁴ kg·m² |
| Encoder Type | 20-bit incremental encoder (131,072 pulses/rev) |
| Encoder Resolution | 20-bit (absolute position feedback via serial communication) |
| Brake Option | No (standard model; brake variant available separately) |
| Protection Rating | IP67 (with connector installed) |
| Cooling Method | Natural convection (self-cooling) |
| Ambient Temperature (Operation) | 0°C to +40°C |
| Ambient Temperature (Storage) | -20°C to +60°C |
| Ambient Humidity | 20% to 80% RH (non-condensing) |
| Vibration Class | V15 (max 15 µm) |
| Insulation Class | Class B (130°C) |
| Dielectric Strength | 1500 VAC for 1 minute |
| Insulation Resistance | 10 MΩ or more at 500 VDC |
| Shaft Type | Straight shaft with keyway (standard) |
| Shaft Diameter | 14 mm (with keyway) |
| Mounting Flange | 60 mm square (with 4x M4 threaded holes) |
| Weight | Approx. 1.4 kg |
| Compatible Drive Series | YASKAWA Sigma-7 (SGD7S-xxxxA) |
| Communication Interface | Serial encoder (BISS or similar protocol) |
| Standards Compliance | CE, UL, RoHS, EN 60034 |
| Dynamic Response | Frequency response up to 1.6 kHz (with compatible drive) |
| Torque Ripple | Less than 1% (rated torque) |

What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22