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Yaskawa SGM7J-04AFA21 Sigma-7 400W Servo Motor with Plain Shaft
| Place of Origin | USA |
| Brand Name | YASKAWA |
| Model Number | SGM7J-02AFA21 |
Product Overview
The Yaskawa SGM7J-04AFA21 is a 400 W Sigma-7 medium-inertia rotary servo motor designed for precise industrial motion control. It provides a rated torque of 1.27 Nm at 3000 RPM and supports a maximum speed of 6000 RPM.
This configuration uses a 24-bit incremental serial encoder and a straight output shaft without a keyway. The final 21 specification does not include a holding brake or oil seal.
Main Features
- 400 W rated output for 200 VAC-class servo systems.
- Medium-inertia design for stable load matching.
- Rated torque of 1.27 Nm and instantaneous maximum torque of 4.46 Nm.
- Rated speed of 3000 RPM and maximum speed of 6000 RPM.
- 24-bit incremental serial encoder.
- Straight output shaft without a keyway.
- Compact 60 mm flange-class construction.
- No integrated holding brake or oil seal.
Technical Specifications
| Manufacturer | Yaskawa Electric |
| Series | Sigma-7 SGM7J |
| Model | SGM7J-04AFA21 |
| Motor Type | Medium-Inertia Rotary Servo Motor |
| Power Supply Class | 200 VAC |
| Rated Output | 400 W |
| Rated Current | 2.5 Arms |
| Instantaneous Maximum Current | 9.3 Arms |
| Rated Torque | 1.27 Nm |
| Instantaneous Maximum Torque | 4.46 Nm |
| Rated Motor Speed | 3000 RPM |
| Maximum Motor Speed | 6000 RPM |
| Encoder | 24-Bit Incremental Serial Encoder |
| Shaft End | Straight Without Key |
| Options | Without Holding Brake or Oil Seal |
| Approximate Dimensions | 60 * 74.7 * 115.5 mm |
| Approximate Motor Weight | 1.1 kg |
| Protective Structure | IP67, Excluding Shaft Opening |
Compatible System and Applications
The SGM7J-04AFA21 is normally used with a compatible 400 W Sigma-7 SERVOPACK such as an SGD7S-2R8A capacity. The complete drive model must be selected according to the controller interface, required safety functions, encoder support and machine communication system.
Typical applications include electronic assembly machinery, semiconductor equipment, compact packaging systems, inspection machines, printing equipment, indexing mechanisms and robotic positioning axes.
Maintenance and Replacement Notes
The output shaft does not have a keyway. Confirm that the installed coupling uses a suitable clamping, compression or shrink-fit arrangement. It should not be mechanically replaced by a keyed-shaft version without checking shaft engagement and coupling compatibility.
Verify the complete suffix, encoder type, shaft diameter, shaft length, flange, connectors, SERVOPACK capacity, firmware and motor parameter file. This version has no holding brake and requires a separate holding method for suspended loads.
Related Models
Related models include SGM7J-04AFA61 with a keyed and tapped shaft, SGM7J-04AFA2C with a plain shaft and holding brake, SGM7J-04A7A21 with an absolute encoder and SGM7J-04AFA6C with a keyed shaft and holding brake.
Inquiry and Supply Notes
Please provide the complete motor nameplate, installed SERVOPACK model, coupling design, cable part numbers and photographs of the shaft and connectors. Product condition and included components must be confirmed for each quotation.
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