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- Siemens
- 1FK7042-2AF71-1RH1
- Synchronous Motor
- Germany
- 48 mm
- 4.9 kg
- Xiamen, China
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Product Overview
The Siemens 1FK7042-2AF71-1RH1 SIMOTICS S Synchronous Motor is a compact permanent-magnet servo motor in the SIMOTICS S-1FK7 family. It has a rated power of 0.82 kW, a rated speed of 3,000 rpm and a rated torque of 2.6 Nm under the specified 100 K temperature-rise condition. Its configuration includes natural cooling, a plain shaft, a holding brake and an absolute encoder with a DRIVE-CLiQ interface.
This motor is intended for servo applications where controlled motion, accurate feedback and repeatable positioning are required. It can be used in machine axes, automated production equipment and other motion-control systems that need coordinated speed and torque control. The integrated encoder supplies position feedback to a compatible drive system, while the holding brake helps retain the motor shaft when the brake is engaged under the specified operating conditions.
The motor is part of the Siemens 1FK7-CT range and is configured for a 600 V DC-link drive system. Its encoder, brake, shaft and connector arrangement should be matched to the machine design and the selected SINAMICS drive configuration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Order Number | 1FK7042-2AF71-1RH1 |
| Product Family | SIMOTICS S-1FK7 |
| Product Type | Synchronous Servo Motor |
| Motor Series | 1FK7-CT |
| Rated Power | 0.82 kW |
| DC-Link Voltage | 600 V |
| Rated Speed | 3,000 rpm |
| Rated Torque (100 K) | 2.6 Nm |
| Stall Torque (100 K) | 3.0 Nm |
| Maximum Mechanical Speed | 9,000 rpm |
| Cooling Method | Natural cooling |
| Mounting Design | IM B5 (IM V1, IM V3) |
| Shaft Design | Plain shaft |
| Shaft Tolerance | N |
| Encoder Type | Absolute encoder, 20-bit + 12-bit multiturn |
| Encoder Interface | DRIVE-CLiQ |
| Holding Brake | Integrated |
| Degree of Protection | IP65 |
| Shaft Height | 48 mm |
| Weight | 4.9 kg |
Product Features
- Permanent-magnet synchronous design: Supports servo operation with controlled torque and speed when paired with a compatible drive.
- Integrated absolute encoder: Provides position feedback through a 20-bit single-turn and 12-bit multiturn encoder configuration.
- DRIVE-CLiQ interface: Enables communication between the encoder and compatible Siemens drive systems.
- Holding brake: Helps hold the shaft when engaged, subject to the brake’s rated holding torque and operating conditions.
- Natural cooling: Uses the specified self-cooled motor construction without requiring a separate motor cooling circuit.
- Plain shaft configuration: Supports machine couplings and transmission arrangements compatible with the motor shaft.
- IP65 protection: Provides protection against dust ingress and water jets under the defined enclosure test conditions.
- Servo drive integration: Fits motion-control applications using a compatible SINAMICS drive and correctly configured motor data.
Working Principle
The 1FK7042-2AF71-1RH1 operates as a permanent-magnet synchronous motor. The compatible servo drive supplies controlled electrical current to the stator windings, producing a rotating magnetic field. The rotor’s permanent magnets interact with this field to generate torque and rotation.
The absolute encoder measures rotor position and transmits feedback through the DRIVE-CLiQ interface. The drive uses this feedback to regulate position, speed and torque according to the machine’s motion command. This closed-loop arrangement supports coordinated movement and repeatable positioning during acceleration, steady operation and deceleration.
The integrated holding brake serves a separate function from the motor’s electromagnetic torque production. When the brake is engaged, it helps prevent the shaft from rotating under loads within its specified holding capability. Brake control must follow the drive and machine safety design; the brake should not automatically be treated as a substitute for a certified safety brake or a means of stopping a moving load under any condition.
Correct motor identification, encoder communication, drive parameterization and brake wiring are essential during commissioning. The drive configuration must match the motor’s electrical and feedback characteristics for proper operation.
Role in a SIMOTICS S Servo Control Architecture
The 1FK7042-2AF71-1RH1 acts as the electromechanical actuator in a closed-loop motion-control system. The controller generates motion commands, the servo drive supplies regulated motor current, and the encoder returns rotor-position feedback for motion correction.
| System Component | Function | Relationship to the Motor |
|---|---|---|
| SIMOTICS S 1FK7 Motor | Converts electrical energy into controlled mechanical motion | Executes the commanded rotary movement |
| SINAMICS Servo Drive | Regulates motor current, torque and speed | Powers the motor and evaluates feedback |
| DRIVE-CLiQ Encoder | Measures rotor position | Supplies absolute position feedback to the drive |
| Holding Brake Circuit | Controls engagement and release of the brake | Helps hold the shaft when engaged |
| Motion Controller / PLC | Executes motion sequences and machine logic | Sends position, speed or torque commands |
| Mechanical Coupling | Transfers motor torque to the driven mechanism | Connects the motor shaft to the machine axis |
| HMI / SCADA System | Displays machine status and diagnostic messages | Allows operators to monitor the motion system |
Industrial Applications
| Application | Motion-Control Task | Role of the Motor |
|---|---|---|
| Automated Production Machinery | Controlled movement of machine axes | Supplies servo torque and encoder feedback |
| Packaging Equipment | Synchronizing motion with product handling | Supports repeatable movement and coordinated positioning |
| Material Handling Systems | Positioning mechanisms and transfer axes | Drives motion under closed-loop control |
| Assembly Automation | Accurate movement between programmed positions | Provides controlled rotary motion for machine mechanisms |
| Machine Tools | Servo-controlled feed or positioning axes | Supplies torque and position feedback to the drive system |
| Industrial Robotics and Special Machinery | Coordinated movement in configured mechanisms | Acts as a servo actuator where its ratings and mounting arrangement are suitable |
Installation and Maintenance
- Verify the motor order number: Confirm that 1FK7042-2AF71-1RH1 matches the required power, encoder, brake and shaft configuration.
- Check mechanical mounting: Ensure that the mounting flange, shaft alignment and coupling arrangement match the machine design.
- Confirm drive compatibility: Select a compatible SINAMICS drive and verify that its electrical configuration supports this motor.
- Isolate the equipment: Follow the applicable electrical lockout procedure and ensure that the driven mechanism cannot move unexpectedly.
- Inspect the motor connections: Check the power connector, encoder interface and brake connections for damage or contamination.
- Verify encoder communication: Confirm that the DRIVE-CLiQ connection is correctly installed and that the drive recognizes the encoder.
- Configure motor data: Load or enter the correct motor identification and parameter data in the drive engineering configuration.
- Check brake control: Verify the brake wiring, release sequence and control logic before operating the motor with a connected load.
- Inspect the shaft and coupling: Check for damage, contamination, excessive mechanical play or misalignment before commissioning.
- Verify the operating environment: Ensure that the installation conditions and enclosure protection requirements are suitable for the motor’s specified ratings.
- Perform a controlled commissioning test: Test rotation, feedback direction, speed response and brake operation under the approved commissioning procedure.
- Record maintenance findings: Document the motor reference, drive parameters, encoder status, brake checks and any abnormal noise or vibration.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| SINAMICS S120 Drive System | Provides servo power and closed-loop motor control | Verify drive sizing and compatibility with the motor’s electrical ratings |
| SINAMICS S120 Motor Module | Supplies controlled current to the motor | Select according to the required current and system configuration |
| DRIVE-CLiQ Connection Cable | Carries encoder communication | Must match the encoder interface and installation requirements |
| Motor Power Cable | Supplies electrical power to the motor | Confirm connector type, cable specification and installation length |
| Holding Brake Control Circuit | Controls brake engagement and release | Follow the motor and drive connection requirements |
| Mechanical Coupling | Transfers motor torque to the machine | Match the shaft interface and mechanical load |
| Motion Controller / PLC | Generates motion commands and sequences | Configure the control system for the selected drive and motor |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Siemens 1FK7042-2AF71-1RH0 | SIMOTICS S Synchronous Motor | Related 1FK7 motor configuration without the same specified IP65 brake configuration | Compare encoder, brake and protection requirements carefully |
| Siemens 1FK7042-2AF71-1QG0 | SIMOTICS S Synchronous Motor | Related 1FK7-CT motor variant | Check encoder type, brake configuration and protection rating before substitution |
| Siemens 1FK7042-2AF71-1RH1 | SIMOTICS S Synchronous Motor | Exact motor reference for this application | Use the full order number when matching a replacement |
| Siemens SINAMICS S120 | Servo Drive System | Compatible drive family for configured SIMOTICS S servo applications | Verify motor-drive compatibility and required power components |
Key Advantages
- Provides controlled rotary motion with a permanent-magnet synchronous motor design.
- Combines absolute position feedback with a DRIVE-CLiQ interface.
- Includes a holding brake for supported shaft-holding applications.
- Supports closed-loop servo control through a compatible Siemens drive.
- Uses natural cooling and an IP65 enclosure rating.
- Fits a range of industrial positioning and automation tasks when correctly sized.
Technical FAQs
What does the 1FK7042-2AF71-1RH1 encoder configuration provide?
The motor uses an absolute encoder with 20-bit single-turn and 12-bit multiturn feedback through DRIVE-CLiQ. This supplies rotor-position information to a compatible Siemens drive for closed-loop motion control.
What is the purpose of the integrated holding brake?
The brake helps hold the motor shaft when engaged, within its specified holding capability. It is not a substitute for verifying the machine’s load-holding and safety requirements, and its operating sequence must be coordinated with the drive.
Which drive system should be used with this motor?
The motor belongs to the SIMOTICS S-1FK7 family and is configured for a 600 V DC-link system. A compatible SINAMICS drive should be selected based on the motor’s ratings, feedback interface, brake arrangement and overall machine requirements.
What should be checked if the motor does not establish closed-loop operation?
Check the motor identification and drive parameters, DRIVE-CLiQ connection, encoder recognition, power connections and brake-control sequence. Also verify that the drive configuration matches the exact motor order number.