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- Siemens
- 1FK7033-4CK71-1RB0
- Synchronous Motor
- Germany
- 36 mm
- 3.4 kg
- Xiamen, China
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Product Overview
The Siemens 1FK7033-4CK71-1RB0 is a SIMOTICS S-1FK7 High Dynamic permanent-magnet synchronous servo motor intended for applications that require rapid acceleration, precise positioning, and controlled motion. With a rated speed of 6,000 rpm and a rated torque of 0.9 Nm, it is suited to compact servo axes where response time and repeatable motion are more important than continuous operation at a single fixed speed.
In an automated assembly machine, for example, the motor can drive a positioning mechanism that moves a component between inspection, processing, and assembly stations. Its permanent-magnet rotor and feedback encoder allow the drive system to regulate motor position and speed according to the motion commands issued by the controller. Similar arrangements are used in packaging machinery, indexing systems, and precision handling equipment.
The suffix configuration is important when selecting this motor. The 1RB0 version includes a holding brake and an AM20DQI absolute encoder with 20-bit single-turn resolution and 12-bit multiturn capability. These features affect the drive configuration, feedback evaluation, and the way a machine manages its axis after power is removed.
The motor uses natural cooling and has a rotating electrical connector arrangement for power and signal connections. During equipment integration, the motor must be matched with a compatible SINAMICS drive, feedback interface, brake-control circuit, and mechanical coupling. Correct selection of these associated components is necessary to achieve the intended positioning performance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 1FK7033-4CK71-1RB0 |
| Product Family | SIMOTICS S-1FK7 |
| Product Type | High Dynamic Synchronous Motor |
| Motor Technology | Permanent-Magnet Synchronous Motor |
| Rated Speed | 6,000 rpm |
| Rated Torque at 100 K | 0.9 Nm |
| Rated Current | 1.6 A |
| Static Torque at 60 K | 1.08 Nm |
| Static Torque at 100 K | 1.3 Nm |
| Stall Current at 60 K | 1.70 A |
| Stall Current at 100 K | 2.10 A |
| Number of Poles | 6 |
| Maximum Permissible Mechanical Speed | 10,000 rpm |
| Maximum Torque | 4.3 Nm |
| Maximum Current | 7.6 A |
| Torque Constant | 0.62 Nm/A |
| Moment of Inertia | 0.350 kg·cm² |
| Efficiency | 88.0% |
| Cooling | Natural cooling |
| Degree of Protection | IP64 |
| Mounting Design | IM B5 (IM V1, IM V3) |
| Holding Brake | With holding brake |
| Shaft End | Feather key |
| Encoder System | AM20DQI absolute encoder, 20-bit single-turn + 12-bit multiturn |
| Temperature Monitoring | Pt1000 temperature sensor |
| Electrical Connections | Rotatable power and signal connectors |
| Shaft Height | 36 mm |
| Weight | 3.4 kg |
Product Features
- High Dynamic servo performance: Supports applications requiring rapid speed changes and precise axis positioning.
- Permanent-magnet synchronous technology: Produces torque through interaction between the rotor’s permanent magnets and the stator’s rotating magnetic field.
- 6,000 rpm rated speed: Suits high-speed positioning and cyclic machine movements within the motor’s operating limits.
- AM20DQI absolute encoder: Supplies single-turn and multiturn position feedback for the compatible drive system.
- Integrated holding brake: Helps retain the mechanical axis when the brake is correctly controlled and the motor is not required to produce holding torque.
- Natural cooling: Eliminates the need for a separate forced-air cooling arrangement under specified operating conditions.
- Pt1000 temperature monitoring: Provides motor temperature information for the associated monitoring system.
- Feather-key shaft: Supports mechanical torque transmission through a compatible shaft and coupling arrangement.
- Rotatable connectors: Allow the power and signal connection orientation to be adapted to the installation layout.
- SINAMICS drive integration: Supports closed-loop servo operation when paired with a compatible drive and correctly configured feedback system.
Working Principle
The 1FK7033-4CK71-1RB0 converts electrical energy into controlled rotary motion through a permanent-magnet synchronous motor structure. The associated servo drive generates the required three-phase stator currents, producing a rotating magnetic field that interacts with the rotor’s permanent magnets.
The control sequence typically follows this arrangement:
Motion Controller → SINAMICS Servo Drive → 1FK7033-4CK71-1RB0 → Mechanical Axis
The controller issues position, speed, or motion-profile commands. The drive regulates motor current and applies the required electrical output, while the encoder supplies position feedback. The drive compares the feedback with the commanded motion and adjusts motor operation to reduce tracking error.
In a pick-and-place machine, the motor may need to accelerate quickly, reach a defined position, and settle before a gripper or processing tool operates. The high-dynamic motor configuration supports this type of cyclic movement, although actual positioning accuracy and response depend on the drive settings, mechanical stiffness, load inertia, encoder configuration, and machine design.
The AM20DQI encoder provides absolute position information, including multiturn data. This can help the control system establish the axis position without relying solely on incremental pulse counting. However, the machine’s reference strategy, encoder evaluation, and restart behavior must be configured correctly in the drive and controller.
The holding brake serves a different purpose from servo torque control. It is intended to secure the mechanical axis when the brake is engaged, rather than replace the motor’s active torque regulation during normal movement. The brake must be controlled according to the drive’s operating sequence, and its holding capacity must be appropriate for the actual load.
Role in a SINAMICS Servo Control Architecture
The 1FK7033-4CK71-1RB0 forms the electromechanical output stage of a closed-loop servo axis. The controller defines the motion sequence, the SINAMICS drive regulates the motor, and the encoder returns position information for feedback control.
PLC / Motion Controller → SINAMICS Drive → Servo Motor → Mechanical Load
Encoder Feedback: Motor → SINAMICS Drive → Motion Control System
| System Element | Function |
|---|---|
| PLC or Motion Controller | Generates motion commands and coordinates the machine sequence |
| SINAMICS Servo Drive | Regulates motor current, speed, and position according to the configured control mode |
| 1FK7033-4CK71-1RB0 | Converts controlled electrical power into rotary motion |
| AM20DQI Encoder | Supplies absolute single-turn and multiturn position feedback |
| Holding Brake Circuit | Controls brake engagement and release according to the application sequence |
| Power and Signal Connectors | Carry motor power, feedback, and associated connections |
| Mechanical Coupling | Transfers motor torque to the driven mechanism |
| Gearbox, Where Required | Adapts torque and speed to the machine’s mechanical requirements |
| Machine Feedback and Interlocks | Coordinate axis movement with sensors, guarding, and process conditions |
Drive selection must account for the motor’s rated current, peak current, speed range, torque requirements, feedback system, and brake configuration. A motor with the same frame family is not necessarily interchangeable if the encoder, brake, shaft, or connector configuration differs.
Industrial Applications
| Application | Typical Use |
|---|---|
| Automated Assembly | Positioning components during assembly and fastening operations |
| Packaging Machinery | Driving indexing axes and synchronized motion mechanisms |
| Pick-and-Place Systems | Moving tools or components between defined positions |
| Precision Handling | Controlling rotary axes in automated material handling equipment |
| Inspection Machinery | Positioning cameras, fixtures, or inspection heads |
| Labeling Equipment | Synchronizing motion with product transport and labeling sequences |
| Small Machine Tools | Driving servo axes where the required torque and speed fit the motor rating |
| Electronic Manufacturing | Operating positioning mechanisms in automated production equipment |
| Laboratory Automation | Moving mechanisms through repeatable programmed motion sequences |
| General Motion Control | Providing closed-loop rotary motion in compact servo-driven machinery |
The motor is best suited to applications that benefit from dynamic servo control rather than simple fixed-speed rotation. Selection should be based on the complete motion profile, including acceleration, deceleration, peak torque, continuous torque, duty cycle, and the inertia of the driven mechanism.
Installation and Maintenance
- Verify the complete motor reference: Confirm 1FK7033-4CK71-1RB0, including the brake and encoder suffix configuration, before replacing an installed motor.
- Check drive compatibility: Confirm that the selected SINAMICS drive supports the motor’s electrical characteristics, encoder system, and holding-brake arrangement.
- Inspect the mounting interface: Check the flange, fasteners, shaft alignment, and mechanical mounting surface before installation.
- Check the coupling arrangement: Verify that the coupling or gearbox matches the shaft design and can accommodate the intended torque and speed.
- Connect the power circuit correctly: Follow the applicable wiring diagram and confirm the motor phases and protective-earth connection.
- Verify encoder connections: Check the feedback connector, cable condition, connector orientation, and drive-side encoder configuration.
- Review brake wiring and control: Confirm the brake supply and control sequence, and verify that the brake releases before commanded motion begins.
- Check the mechanical load: Assess the driven mechanism for excessive inertia, binding, backlash, or other conditions that could increase motor loading.
- Configure motor data: Enter or identify the correct motor data in the drive configuration and verify the feedback and brake parameters.
- Perform controlled commissioning: Test the axis at a conservative speed and acceleration before progressing to the intended operating profile.
- Monitor temperature and motion behavior: Investigate abnormal heating, vibration, noise, position deviation, or repeated drive faults rather than compensating by changing parameters without diagnosis.
- Document the final configuration: Record the drive assignment, encoder settings, brake sequence, motor parameters, and relevant commissioning results for future maintenance.
Before disconnecting the motor, isolate the drive and follow the site’s electrical safety procedures. A servo motor can generate voltage when its shaft is externally driven, so the system must be secured against unintended movement and electrical hazards.
Compatible System Components
The motor operates as part of a servo system in which the drive, feedback interface, mechanical transmission, and brake-control arrangement must be compatible with the exact motor configuration.
| Component | Function |
|---|---|
| SINAMICS S120 Motor Module | Supplies controlled motor power in a compatible S120 configuration |
| SINAMICS S120 Control Unit | Coordinates drive operation and closed-loop motor control |
| SINAMICS S110 Servo Drive | A servo-drive family to evaluate for applications within the required motor and feedback specifications |
| AM20DQI Encoder Interface | Evaluates the motor’s absolute encoder feedback through a compatible drive interface |
| Holding Brake Control Circuit | Controls the integrated brake according to the approved sequence |
| Motor Power Cable | Connects the drive power output to the motor |
| Encoder Signal Cable | Carries position feedback to the drive |
| PLC or Motion Controller | Generates axis commands and machine sequencing |
| Mechanical Coupling | Transfers torque to the driven axis |
| Gearbox, Where Required | Matches the motor’s output speed and torque to the mechanical load |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 1FK7033-4CK71-1RG1 | SIMOTICS S-1FK7 High Dynamic Synchronous Motor | Similar motor configuration with a different brake and shaft arrangement |
| Siemens 1FK7033-4CK71-1RA0 | SIMOTICS S-1FK7 High Dynamic Synchronous Motor | Related servo motor variant for motion-control applications |
| Siemens 1FK7033-4CK71-1RH0 | SIMOTICS S-1FK7 High Dynamic Synchronous Motor | Related motor configuration with a different encoder and shaft specification |
| Siemens 1FK7033-4CK71-1CH0 | SIMOTICS S-1FK7 High Dynamic Synchronous Motor | Alternative feedback configuration for compatible servo systems |
| Siemens 1FK7033-4CK71-1PG0-Z | SIMOTICS S-1FK7 High Dynamic Synchronous Motor | Variant with a different shaft and feedback configuration |
| Siemens 1FK7043-4CH71 | SIMOTICS S-1FK7 High Dynamic Synchronous Motor | Related 1FK7 motor for applications requiring a different motor rating |
Key Advantages
- High-dynamic permanent-magnet servo motor technology.
- Rated speed of 6,000 rpm for demanding cyclic motion.
- Absolute single-turn and multiturn encoder feedback.
- Integrated holding brake for suitable axis-holding applications.
- Natural cooling and integrated temperature monitoring.
- Compatible with appropriately configured SINAMICS servo systems.
- Suitable for compact positioning and automation mechanisms.
Technical FAQs
What does the 1RB0 suffix indicate in the 1FK7033-4CK71-1RB0 motor reference?
The configuration identifies a motor with a holding brake and an AM20DQI absolute encoder. These options affect the brake-control wiring, feedback evaluation, and drive commissioning. When replacing the motor, the full order number should be checked rather than selecting another 1FK7 motor based only on its basic type designation.
Can the AM20DQI encoder provide multiturn position information after power is removed?
The AM20DQI configuration includes absolute single-turn and multiturn position information. However, the behavior of the complete axis after a power interruption depends on the encoder evaluation, drive configuration, controller startup procedure, and machine reference strategy. These settings should be verified during commissioning.
How should the integrated holding brake be used during machine operation?
The brake should follow the specified drive-control sequence. It is generally released before motor movement and engaged when the axis needs to be secured. It should not be used as a substitute for dynamic servo torque control, and applications involving suspended or gravity-loaded axes require an appropriate safety and load-holding assessment.
What should be checked if the motor reaches speed but the axis positioning is inaccurate?
Check the encoder connection and configuration, drive feedback status, mechanical coupling, load inertia, and the motion-control tuning. Also investigate backlash, mechanical looseness, and excessive load torque. Changing the controller’s position parameters without first checking the mechanical and feedback systems may conceal the underlying problem.