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- Siemens
- 1FK7042-2AF71-1RG1
- Synchronous Motor
- Germany
- 48 mm
- 4.601 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Siemens 1FK7042-2AF71-1RG1 is a SIMOTICS S synchronous motor for servo-controlled machine axes. It belongs to the 1FK7 motor family used with Siemens motion-control systems, where the motor works as part of a coordinated drive axis rather than as a standalone rotating machine.
This type of motor is commonly used where the machine needs repeatable rotary movement, controlled acceleration and deceleration, or synchronization with other axes. Typical examples include packaging mechanisms, indexing equipment, automated assembly stations, machine tools, and production machinery with electronically controlled axes.
In a typical installation, the motor is connected to a compatible Siemens servo drive, with the drive regulating motor operation according to commands from the motion controller. The motor’s feedback system supplies actual motor information to the control loop, allowing the axis to respond to commanded movement and correct deviations during operation.
For replacement work, the motor should be considered together with the complete axis. Drive compatibility, feedback configuration, mechanical coupling, load characteristics, and machine-axis settings all need to match the intended application.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 1FK7042-2AF71-1RG1 |
| Product Type | Synchronous Motor |
| Product Family | SIMOTICS S |
| Series | 1FK7 |
| Motor Technology | Permanent-Magnet Synchronous Motor |
| Motion Type | Servo Motion |
| Control Method | Closed-Loop Motion Control |
| Application | Industrial Machine-Axis Motion |
| System Integration | Siemens Servo Drive and Motion Controller |
| Feedback | Motor Feedback System |
| Mechanical Function | Rotary Machine-Axis Drive |
| Installation | Machine-Mounted |
| Shaft Height | 48 mm |
| Weight | 4.601 kg |
Product Features
- SIMOTICS S synchronous motor for industrial servo applications
- 1FK7 family motor architecture for controlled machine-axis movement
- Suitable for positioning, indexing, and coordinated rotary motion
- Operates as part of a closed-loop servo system
- Works with a compatible Siemens servo drive and motion controller
- Motor feedback supports continuous monitoring of axis movement
- Suitable for automated machinery requiring repeatable motion sequences
- Can be integrated with couplings, gearboxes, belts, or other suitable mechanical transmission arrangements
- Applicable to both individual machine axes and coordinated multi-axis systems
- Suitable for production equipment, machine tools, and automation systems
Working Principle
The 1FK7042-2AF71-1RG1 is used as the rotary actuator within a servo axis. The motion controller determines the required machine movement, while the Siemens servo drive converts the motion command into controlled electrical output for the motor.
The motor converts that electrical input into rotary movement. The connected shaft or mechanical transmission then transfers the movement to the machine mechanism. Depending on the machine, this may drive an indexing assembly, feed mechanism, rotary table, conveyor section, tooling axis, or another controlled mechanical element.
During operation, the motor feedback system reports actual motor behavior to the servo control loop. The drive uses this information to regulate the axis and keep the motor response aligned with the commanded movement.
A typical motion path is:
Motion Controller → Siemens Servo Drive → 1FK7042-2AF71-1RG1 → Mechanical Transmission → Machine Axis
The mechanical side of the installation is just as important as the electrical configuration. Coupling alignment, load characteristics, mechanical backlash, and unexpected resistance can all affect the resulting axis movement even when the motor and drive are functioning correctly.
Role in a Servo Motion Control Architecture
The 1FK7042-2AF71-1RG1 occupies the motor layer of a Siemens servo system. It converts the controlled electrical output from the drive into mechanical rotation and contributes feedback information to the closed-loop axis.
| Control Architecture Layer | Function | Relationship to 1FK7042-2AF71-1RG1 |
|---|---|---|
| Motion Controller | Generates and coordinates machine-axis commands | Determines the required movement |
| Servo Drive | Controls motor power and servo regulation | Supplies controlled electrical output |
| Motor Layer | Converts electrical energy into rotary movement | 1FK7042-2AF71-1RG1 |
| Feedback Layer | Reports actual motor behavior | Supports closed-loop axis control |
| Mechanical Transmission | Transfers motor rotation to the machine | Connects the motor to the driven mechanism |
| Machine Axis | Performs the required production movement | Receives the motor’s mechanical output |
| Supervisory System | Provides operator and machine-level control | Coordinates operation through the automation system |
Industrial Applications
| Application | Typical Use |
|---|---|
| Packaging Machinery | Drives positioning, indexing, and coordinated rotary mechanisms |
| Automated Assembly | Controls repeatable movement of assembly stations and tooling |
| Machine Tools | Provides controlled rotary movement for selected machine axes |
| Material Handling | Drives positioning and transfer mechanisms where coordinated motion is required |
| Production Machinery | Supports repetitive machine cycles and synchronized axis movement |
| Printing Equipment | Controls selected feed, positioning, or synchronization mechanisms |
| Converting Machinery | Supports controlled movement in cutting, feeding, and material-processing equipment |
| Robotics and Automation | Provides rotary movement for integrated automated mechanisms |
Installation and Maintenance
- Verify drive compatibility — Confirm that the connected Siemens servo drive supports the selected 1FK7 motor configuration and intended axis application.
- Check mechanical mounting — Inspect the mounting arrangement and ensure the motor is secured correctly to the machine structure.
- Inspect the motor before installation — Check the housing, shaft, connectors, and accessible surfaces for mechanical damage or contamination.
- Verify feedback compatibility — Confirm that the motor feedback connection and associated drive configuration match the installed motor.
- Check motor power connections — Inspect the power cable, connectors, terminals, and routing before energizing the motor.
- Protect feedback wiring — Route feedback cables appropriately and avoid unnecessary exposure to electrical interference from power circuits.
- Inspect the mechanical load — Confirm that the driven mechanism moves freely and that there is no abnormal resistance, binding, or obstruction.
- Check drive parameters — Verify the selected motor data, feedback settings, direction, scaling, and other applicable axis parameters in the motion system.
- Inspect coupling and alignment — Check the shaft coupling or other transmission arrangement for correct alignment and excessive mechanical stress.
- Perform a controlled movement test — Start with a low-risk movement to verify direction, basic response, and communication between the drive and controller.
- Monitor axis behavior — Observe positioning response, vibration, noise, temperature, and servo faults during initial operation and subsequent maintenance testing.
- Document the replacement — Record the motor model, drive configuration, feedback arrangement, and relevant machine-axis settings for future service work.
Related Components
| Component | Function |
|---|---|
| Siemens SINAMICS Servo Drive | Regulates motor power and closed-loop servo operation |
| Siemens Motion Controller | Generates and coordinates machine-axis movement |
| Motor Power Cable | Connects the servo drive to the motor power circuit |
| Motor Feedback Cable | Transfers motor feedback information to the servo system |
| Mechanical Coupling | Transfers motor rotation to the driven mechanism |
| Gearbox | Adapts motor movement to the requirements of the machine |
| HMI / Engineering System | Provides operator control, diagnostics, and configuration access |
| Industrial Control Network | Connects motion-control and automation devices within the machine |
Recommended Related Models
| Model | Product Type | Series | Typical Relationship |
|---|---|---|---|
| Siemens 1FK7042-2AF71-1CG0 | Synchronous Motor | 1FK7 | Closely related 1FK7042 motor variant |
| Siemens 1FK7042-2AF71-1CH1 | Synchronous Motor | 1FK7 | Related motor variant for comparable servo-axis applications |
| Siemens 1FK7042-2AF71-1CH2 | Synchronous Motor | 1FK7 | Related 1FK7042 configuration |
| Siemens 1FK7042-2AF71-1RA0 | Synchronous Motor | 1FK7 | Related motor variant within the same 1FK7042 family |
| Siemens 1FK7042-2AF71-1RB1 | Synchronous Motor | 1FK7 | Related 1FK7042 servo motor variant |
Key Advantages
- SIMOTICS S motor platform for industrial servo applications
- 1FK7 family architecture for controlled machine-axis motion
- Closed-loop operation with motor feedback
- Suitable for positioning and coordinated movement
- Integrates with Siemens servo drive and motion-control systems
- Applicable to automated production and machine-axis applications
- Suitable for replacement and maintenance within compatible 1FK7 systems
Technical FAQs
What type of machine axis can use the 1FK7042-2AF71-1RG1?
It can be used in machine axes requiring controlled rotary movement, such as positioning, indexing, feeding, assembly, and other automated mechanisms. The actual application depends on the complete drive and mechanical-axis configuration.
Why does the servo drive need the motor feedback information?
Feedback allows the servo system to monitor actual motor behavior instead of operating only from the commanded value. This information is used within the closed-loop control process to regulate the motor response during machine movement.
What should be matched when replacing this motor?
The motor should be checked against the existing Siemens servo drive, feedback arrangement, mechanical mounting, shaft connection, controller configuration, and machine load. Matching only the 1FK7 family is not sufficient to establish replacement compatibility.
What can cause abnormal movement after installing a replacement motor?
Potential causes include incorrect drive parameters, feedback connection problems, incorrect movement direction, coupling misalignment, mechanical resistance, excessive load, or configuration differences between the replacement motor and the existing axis. Troubleshooting should therefore cover both the electrical control loop and the mechanical transmission.