Product Overview

The Siemens 1FK7060-5AF71-1KH5 SIMOTICS S Synchronous Servo Motor is part of the 1FK7 Compact family of permanent-magnet synchronous motors. It serves as the rotary actuator in automated machinery where the position, speed, and acceleration of a mechanism must be controlled through a compatible servo drive. Typical installations include assembly machines, packaging equipment, indexing stations, and automated production lines.

In an assembly system, for example, the motor may move a fixture into a fastening station and hold its position while the operation takes place. In a packaging machine, it may drive a feed mechanism that must stop at repeatable intervals. These tasks require controlled acceleration and deceleration, accurate feedback, and sufficient torque to overcome the inertia and resistance of the connected mechanism.

The 1FK7060 frame belongs to the 63 mm shaft-height class. Its permanent-magnet rotor generates torque through interaction with the magnetic field produced by the stator windings. A compatible Siemens servo drive regulates the motor current and processes the motion feedback, allowing the machine controller to coordinate the axis with the wider production sequence.

The 1KH5 configuration is associated with a feedback-equipped motor and an integrated holding-brake arrangement. The feedback system supports position monitoring by the compatible drive, while the brake can secure the shaft when the motor is stationary and the brake is correctly engaged. This is useful for mechanisms that must remain in position during a controlled stop or when the drive is disabled. A holding brake is not intended to stop a freely rotating shaft under normal operating conditions.

The motor’s brake and feedback interfaces must be integrated into the drive configuration as part of the complete axis. Brake release, motor enable, and shutdown sequences need to be coordinated so that the brake is not used as a substitute for normal servo deceleration. Applications involving suspended or gravity-loaded mechanisms also require an assessment of the complete load-holding and machine-safety arrangement.

Mechanical installation has a direct effect on motion performance. Shaft alignment, coupling selection, mounting rigidity, and load inertia influence vibration, positioning accuracy, and bearing life. When replacing an installed motor, matching the complete Siemens order number is important because encoder technology, connector configuration, and brake characteristics can differ among otherwise similar 1FK7 motors.

Technical Specifications

Product Features

• Permanent-magnet synchronous design: Converts regulated electrical input into rotary torque for servo-controlled movement.
• 1FK7 Compact platform: Supports integration into industrial machinery using the corresponding motor mounting arrangement.
• 3,000 rpm rated operating speed: Supports applications requiring controlled rotary movement within the motor’s operating envelope.
• Feedback-based motion control: Allows a compatible drive to monitor motor position and regulate movement.
• Integrated holding brake: Helps retain the shaft at standstill when correctly engaged and used within its specified limits.
• Natural cooling: Dissipates motor heat through the specified cooling arrangement without a separate motor-mounted fan.
• Flange mounting: Supports installation in compatible machine structures and servo-axis assemblies.
• Drive-system integration: Works with compatible Siemens servo equipment for positioning and coordinated motion.
• Application-specific configuration: Supports selection within the 1FK7 family according to the axis’s electrical, mechanical, and control requirements.

Working Principle

The 1FK7060-5AF71-1KH5 generates rotary motion through the interaction between its permanent-magnet rotor and the magnetic field produced by the stator windings. A compatible servo drive regulates the winding current, controlling the torque available at the motor shaft.

Motion Command → Servo Drive → Stator Magnetic Field → Rotor Movement → Mechanical Load

When the machine controller requests a movement, the drive calculates the required response and supplies controlled current to the motor. During acceleration, the motor develops torque to overcome load resistance and rotational inertia. As the axis approaches its target, the drive adjusts the output to achieve the commanded speed or position.

Feedback allows the drive to monitor the motor’s movement. In a positioning application, this information supports the control loops that regulate the axis and correct deviations from the commanded motion. The encoder interface must be compatible with the selected drive so that position information can be processed correctly.

The integrated holding brake performs a separate function. When the motor is stationary and the brake is engaged, it applies holding force to resist shaft rotation. During normal motion, the brake must be released according to the required operating sequence. The servo drive, motor control, and brake control must be coordinated to avoid releasing the brake before sufficient motor torque is available or engaging it while the shaft is moving at an unsuitable speed.

Consider a machine axis that positions a fixture at a loading station. The servo drive moves the motor to the required position and brings the axis to a controlled stop. Once the appropriate standstill conditions are established, the brake can engage if the application requires the shaft to remain held. Before movement resumes, the control sequence releases the brake and restores normal servo operation.

The motor’s thermal behavior depends on the current required by the load and the duty cycle. Frequent acceleration, repeated reversals, and sustained torque can generate more heat than steady operation. Proper sizing therefore requires consideration of the actual motion profile, not just the rated speed or nominal power.

Role in a Siemens SIMOTICS S Servo Drive System

The 1FK7060-5AF71-1KH5 provides the mechanical output for a servo-controlled axis. The servo drive regulates its motion, the feedback system supplies position information, and the machine controller coordinates movement with other equipment. The integrated holding brake adds a shaft-holding function for suitable standstill conditions.

Machine Controller → SINAMICS Servo Drive → 1FK7060-5AF71-1KH5 → Mechanical Coupling → Machine Axis

The brake, feedback system, and servo drive must operate as a coordinated assembly. The brake’s holding function does not replace the drive’s motion control or the machine’s required safety measures.

Industrial Applications

Applications with suspended loads, vertical movement, or potential movement after power loss require particular attention to the complete load-holding and safety arrangement. The integrated holding brake must be applied within its specified limits and should not be treated as a substitute for a separately required safety brake.

Installation and Maintenance

1. Inspect the motor designation: Confirm that the installed unit matches the required 1FK7060-5AF71-1KH5 configuration and the machine’s electrical and mechanical interfaces.
2. Check servo-drive compatibility: Ensure that the selected drive supports the motor’s rated data and feedback interface.
3. Prepare the mounting flange: Clean the mating surfaces and inspect the mounting points for damage, contamination, or uneven contact.
4. Align the mechanical coupling: Align the motor shaft with the driven mechanism within the coupling manufacturer’s permitted tolerances.
5. Secure the motor assembly: Fasten the motor according to the applicable mounting procedure and ensure that the connection can withstand the operating loads.
6. Connect the motor power cable: Inspect the connector, cable condition, protective grounding, and electrical connections before energizing the system.
7. Connect the feedback interface: Establish the feedback connection and check communication status during drive commissioning.
8. Integrate the holding brake: Connect the brake circuit and coordinate brake release and engagement with the motor-control sequence.
9. Configure the servo drive: Set the appropriate motor and feedback parameters and confirm that the drive identifies the connected motor correctly.
10. Test the axis under controlled conditions: Begin with a low-speed movement and check rotation direction, positioning response, brake operation, and drive diagnostics.
11. Monitor operating conditions: Investigate abnormal heating, vibration, noise, or changes in positioning accuracy before returning the machine to normal production.
12. Document maintenance results: Record the motor designation, drive configuration, brake test results, inspection findings, and corrective actions.

During maintenance, pay particular attention to brake behavior and feedback communication. If the motor moves unexpectedly during a stop or fails to release correctly, investigate the brake-control sequence, drive status, and mechanical load rather than assuming the motor itself is defective.

Related Components

Recommended Related Models

Key Advantages

• Supports controlled rotary motion in automated machinery.
• Combines permanent-magnet synchronous motor technology with feedback-based drive control.
• Includes a holding brake for suitable standstill applications.
• Integrates with compatible Siemens servo-drive equipment.
• Supports positioning and coordinated movement in industrial automation systems.
• Fits applications requiring a servo motor with an integrated shaft-holding function.

Technical FAQs

What is the purpose of the integrated holding brake on this servo motor?

The holding brake helps prevent shaft rotation when the motor is stationary and the brake is engaged. It is useful for applications that need the axis to remain in position during a controlled stop. It is not intended to replace normal servo deceleration or serve as a working brake for stopping a moving shaft.

How should brake operation be coordinated with servo movement?

The control sequence should establish sufficient motor torque before releasing the brake and should bring the axis to an appropriate standstill condition before engaging it. The brake-control logic must be coordinated with the servo drive and the machine sequence to avoid unintended movement or unnecessary mechanical stress.

What should be investigated if the motor runs but the positioning response is incorrect?

Check the encoder communication, drive configuration, mechanical coupling, load inertia, and motion-control parameters. Feedback errors and mechanical backlash can both affect positioning, so diagnosis should include the complete axis rather than focusing exclusively on the motor.

Is the holding brake sufficient to secure a vertical axis during a power failure?

The brake’s suitability depends on the load, required holding torque, operating conditions, and the machine’s safety design. Where uncontrolled movement could create a hazard, the complete system may require additional load-holding or safety measures. The motor’s holding brake should not automatically be treated as the sole protective measure.