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- Siemens
- 1FK7042-2AK71-1RH0
- Synchronous Motor
- Germany
- 48 mm
- 4.9 kg
- Xiamen, China
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Product Overview
The Siemens 1FK7042-2AK71-1RH0 SIMOTICS S Synchronous Motor is a compact permanent-magnet servo motor in the SIMOTICS S-1FK7 family. It has a rated power of 0.94 kW, a rated speed of 6,000 rpm and a static torque of 3 Nm under the 100 K temperature-rise condition. The motor uses natural cooling and an IM B5 mounting arrangement, with alternative IM V1 and IM V3 installation positions.
This configuration combines an absolute encoder with a DRIVE-CLiQ interface, a smooth shaft and an integrated holding brake. The encoder supplies position feedback for closed-loop motion control, while the brake helps hold the shaft when engaged within its specified operating limits. These features make the motor suitable for servo-driven machine axes that require controlled rotation and repeatable positioning.
The 1FK7042-2AK71-1RH0 operates with a 600 V DC-link drive system and has an IP64 degree of protection. When integrating it into a machine, the drive, encoder connection, brake-control circuit and mechanical coupling must match the motor’s configuration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Order Number | 1FK7042-2AK71-1RH0 |
| Product Family | SIMOTICS S-1FK7 |
| Product Type | Synchronous Servo Motor |
| Motor Series | 1FK7-CT |
| Rated Power | 0.94 kW |
| DC-Link Voltage | 600 V |
| Rated Speed | 6,000 rpm |
| Rated Torque (100 K) | 1.5 Nm |
| Static Torque (100 K) | 3.0 Nm |
| Static Torque (60 K) | 2.5 Nm |
| Maximum Mechanical Speed | 9,000 rpm |
| Cooling Method | Natural cooling |
| Mounting Design | IM B5 (IM V1, IM V3) |
| Shaft Design | Smooth shaft |
| Shaft Tolerance | N |
| Encoder Type | Absolute encoder, 20-bit single-turn + 12-bit multiturn |
| Encoder Interface | DRIVE-CLiQ |
| Holding Brake | Integrated permanent-magnet brake |
| Holding Torque | 4.0 Nm |
| Brake Supply Voltage | 24 V DC ±10% |
| Degree of Protection | IP64 |
| Shaft Height | 48 mm |
| Weight | 4.9 kg |
Product Features
- Permanent-magnet synchronous design: Supports regulated speed, torque and position control when paired with a compatible servo drive.
- Absolute encoder feedback: Provides 20-bit single-turn and 12-bit multiturn position information for closed-loop motion applications.
- DRIVE-CLiQ interface: Connects the encoder feedback system to compatible Siemens drive equipment.
- Integrated holding brake: Helps prevent unwanted shaft movement when engaged, subject to its rated holding capability.
- Natural cooling: Uses the specified self-cooled motor construction without requiring a separate motor-cooling circuit.
- Smooth shaft configuration: Supports compatible couplings and transmission components selected for the machine application.
- IP64 protection: Provides protection against dust ingress and water splashes under the defined enclosure test conditions.
- Flexible mounting arrangement: Supports IM B5 mounting and the specified IM V1 and IM V3 installation positions.
Working Principle
The 1FK7042-2AK71-1RH0 operates through the interaction between the stator’s controlled magnetic field and the permanent magnets in the rotor. A compatible servo drive regulates current in the stator windings, producing torque and controlled shaft rotation.
The absolute encoder measures the rotor’s position and transmits feedback through the DRIVE-CLiQ interface. The drive compares the feedback with the commanded motion value and adjusts motor current to achieve the requested position, speed or torque. This closed-loop process supports coordinated movement and repeatable positioning as mechanical loads change.
The integrated permanent-magnet holding brake performs a separate shaft-holding function. When the brake is engaged, it helps hold the shaft within its rated holding torque. Brake operation must follow the drive and machine control sequence; the holding brake should not be assumed to replace a separately required safety braking system.
During commissioning, the motor identification, encoder communication, brake wiring and drive parameters must be verified together. Incorrect feedback configuration or brake sequencing can prevent the motor from operating as intended.
Role in a SIMOTICS S Servo Control Architecture
The 1FK7042-2AK71-1RH0 acts as the electromechanical actuator in a closed-loop motion-control system. The controller generates motion commands, the servo drive supplies regulated current, and encoder feedback allows the drive to correct the motor’s response.
| System Component | Function | Relationship to the Motor |
|---|---|---|
| SIMOTICS S-1FK7 Motor | Converts electrical energy into controlled rotary motion | Executes the commanded movement |
| SINAMICS Servo Drive | Regulates motor current, speed and torque | Powers the motor and processes encoder feedback |
| Absolute Encoder | Measures rotor position | Supplies single-turn and multiturn position data |
| DRIVE-CLiQ Connection | Carries encoder communication | Connects the feedback system to compatible drive equipment |
| Holding Brake Circuit | Controls brake engagement and release | Helps hold the shaft when engaged |
| Motion Controller / PLC | Executes motion sequences and machine logic | Supplies position, speed or torque commands |
| Mechanical Coupling | Transfers motor torque to the driven mechanism | Connects the smooth shaft to the machine transmission |
| HMI / SCADA System | Displays operating status and diagnostic messages | Supports operator monitoring of the motion system |
Industrial Applications
| Application | Motion-Control Task | Role of the Motor |
|---|---|---|
| Automated Production Machinery | Controlling rotary machine axes | Provides servo torque and position feedback |
| Packaging Equipment | Coordinating motion during product handling | Supports repeatable positioning and synchronized movement |
| Assembly Automation | Moving mechanisms between programmed positions | Supplies controlled rotary actuation |
| Material Handling Systems | Driving positioning and transfer mechanisms | Regulates movement through closed-loop servo control |
| Machine Tools | Operating servo-controlled axes and mechanisms | Provides controlled motion when appropriately sized for the application |
| Industrial Special-Purpose Machinery | Executing programmed rotary movements | Combines encoder feedback with a holding brake for configured applications |
Installation and Maintenance
- Verify the motor reference: Confirm that 1FK7042-2AK71-1RH0 matches the required encoder, brake, shaft and protection configuration.
- Check the mounting arrangement: Verify that the machine interface is compatible with the specified IM B5, IM V1 or IM V3 mounting position.
- Confirm drive compatibility: Select a compatible Siemens servo drive for the motor’s ratings and 600 V DC-link configuration.
- Isolate the equipment: Follow the applicable electrical lockout procedure and secure the driven mechanism before maintenance.
- Inspect the power connection: Check the motor connector and power cable for damage, contamination or loose connections.
- Verify encoder communication: Confirm that the DRIVE-CLiQ connection is secure and that the drive recognizes the absolute encoder.
- Check the holding brake circuit: Verify the brake supply, wiring and control sequence before operating the motor with a connected load.
- Configure motor parameters: Ensure that the drive configuration matches the exact motor order number and encoder arrangement.
- Inspect the shaft and coupling: Check the smooth shaft and mating coupling for damage, misalignment or excessive mechanical play.
- Check the installation environment: Ensure that the operating conditions comply with the motor’s specified protection rating and temperature requirements.
- Perform a controlled commissioning test: Verify rotation direction, encoder feedback, speed response and brake operation under the approved 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 motor-drive sizing and compatibility with the encoder interface |
| SINAMICS Motor Module | Supplies controlled current to the motor | Select according to the motor and drive-system requirements |
| DRIVE-CLiQ Cable | Carries encoder communication | Match the cable and connector arrangement to the installed system |
| Motor Power Cable | Supplies electrical power | Confirm the connector type and cable specification |
| Holding Brake Control Circuit | Controls brake engagement and release | Follow the motor and drive connection requirements |
| Motion Controller / PLC | Generates motion commands and sequences | Configure the controller for the selected drive and motor |
| Mechanical Coupling | Transfers torque to the machine mechanism | Match the coupling to the smooth shaft and mechanical load |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Siemens 1FK7042-2AK71-1RH1 | SIMOTICS S Synchronous Motor | Related 1FK7-CT configuration with holding brake and absolute encoder | Compare the exact order data and protection specifications |
| Siemens 1FK7042-2AK71-1UG0 | SIMOTICS S Synchronous Motor | Related 1FK7-CT configuration with resolver feedback and no holding brake | Consider when the application requires a different feedback arrangement |
| Siemens 1FK7042-2AF71-1RH1 | SIMOTICS S Synchronous Motor | Related motor in the same general 1FK7 family | Compare rated speed, shaft configuration and encoder specifications |
| Siemens SINAMICS S120 | Servo Drive System | Drive family for compatible SIMOTICS S servo applications | Verify the complete drive configuration and motor data before selection |
Key Advantages
- Provides closed-loop servo control through absolute encoder feedback.
- Combines single-turn and multiturn position measurement in one encoder system.
- Includes an integrated permanent-magnet holding brake.
- Supports natural cooling and multiple specified mounting positions.
- Offers IP64 enclosure protection.
- Integrates into compatible Siemens servo drive architectures for industrial motion applications.
Technical FAQs
What encoder is installed in the Siemens 1FK7042-2AK71-1RH0?
The motor uses an AM20DQI absolute encoder with 20-bit single-turn and 12-bit multiturn resolution. Its DRIVE-CLiQ interface supplies position feedback to a compatible Siemens drive.
What is the function of the integrated holding brake?
The permanent-magnet brake helps hold the motor shaft when engaged, with a specified holding torque of 4.0 Nm. Its suitability for a particular load depends on the machine design and operating conditions; it should not automatically be treated as a safety-rated stopping device.
Which drive characteristics must be matched to this motor?
The drive must support the motor’s electrical ratings, 600 V DC-link configuration and DRIVE-CLiQ feedback arrangement. The brake-control connection and motor parameters must also be configured correctly.
What should be checked if the motor position feedback is incorrect?
Check the DRIVE-CLiQ cable and connectors, encoder recognition, motor identification and drive parameterization. Also verify the mechanical coupling and the controller’s axis configuration before replacing the motor.