Description
Lenze MDFKARS080-22 | 3.9 kW Servo Motor
Product Introduction
The Lenze MDFKARS080-22 belongs to the MDFKA family of asynchronous servo motors used in industrial machine motion systems. It is a three-phase AC motor with a square, finned housing, external/forced cooling, and resolver feedback. The “080-22” designation identifies the 080 frame configuration and two-pole-pair motor arrangement documented for this model.
For replacement work, the electrical ratings are the first hard check: 3.9 kW, 390 V, 9.1 A, 3,455 RPM, and 10.8 Nm. The motor’s resolver feedback and forced cooling arrangement also have to match the existing Lenze drive and machine configuration. A motor that physically bolts into the machine is not necessarily an electrically valid replacement.
MDFKARS080-22
Key Technical Specifications
- Manufacturer: Lenze
- Model: MDFKARS080-22
- Motor Family: MDFKA
- Motor Type: Asynchronous servo motor
- Electrical Supply: Three-phase AC
- Rated Power: 3.9 kW
- Rated Voltage: 390 V
- Rated Current: 9.1 A
- Rated Speed: 3,455 RPM
- Rated Torque: 10.8 Nm
- Frequency: 120 Hz for the documented 3.9 kW / 3,455 RPM operating point
- Feedback: Resolver
- Cooling: Forced ventilation
- Frame Size: 080
- Motor Length: 2
- Pole Pairs: 2
- Approximate Motor Weight: 16.9 kg
- Protection Rating: IP54 is reported in industrial replacement records; verify the physical nameplate/manual for the exact motor revision before treating this as an installation specification.
An important engineering detail is that the MDFKA family can have different operating points depending on winding/configuration. Service documentation for this exact model family reports 2.1 kW at 1,635 RPM / 60 Hz or 3.9 kW at 3,455 RPM / 120 Hz, so the machine’s actual drive parameters should be checked rather than assuming one operating point applies to every application.
Application Scenarios & Pain Points
Industrial Motion Systems
The MDFKARS080-22 is intended for machine applications requiring controlled asynchronous motor operation with feedback. The resolver provides the position/speed feedback needed by the associated drive system.
Printing and Web-Handling Machinery
The model is documented in industrial replacement channels for printing equipment, including Muller Martini machinery. In these applications, an obsolete servo motor can become a downtime issue when the original machine platform is no longer supported.
High-Speed Machine Drives
The documented 3,455 RPM / 3.9 kW / 10.8 Nm operating point suits machinery requiring controlled rotational speed rather than a conventional fixed-speed induction motor.
Legacy Lenze Equipment
This is particularly relevant when maintaining older Lenze-controlled machinery. Current industrial records identify the MDFKARS080-22 as discontinued, making exact-part sourcing, repair, and tested replacement inventory practical considerations for maintenance teams.
QA & Live Testing SOP
Step 1 — Nameplate Verification
Before any electrical test, verify:
- MDFKARS080-22
- Lenze identification information
- Rated voltage
- Rated current
- Rated power
- Rated speed
- Frequency
- Resolver identification
- Cooling configuration
Do not approve the motor based only on “MDFKA 080.”
Step 2 — Mechanical Inspection
Inspect the housing, mounting flange, shaft, bearings, cooling fan/forced-air arrangement, connector or terminal area, and resolver wiring.
Check specifically for shaft damage and signs of overheating. Forced-ventilated motors depend on the cooling arrangement being present and functional.
Step 3 — Resolver Verification
Check resolver wiring and insulation before connecting the motor to a drive.
A correct power circuit with an incorrect resolver connection can produce an apparently healthy motor that cannot be commissioned correctly.
Step 4 — Controlled Drive Test
Use the compatible Lenze drive/control architecture and the correct motor configuration.
Start at low commanded speed. Confirm that the resolver feedback is recognized and that the drive does not report feedback, overcurrent, overspeed, or configuration faults.
Step 5 — Dynamic Test
Progressively test the motor while monitoring:
- Phase current
- Resolver feedback
- Acceleration
- Deceleration
- Mechanical vibration
- Bearing noise
- Cooling airflow
- Drive fault status
- Temperature rise
Do not use an unloaded spin test as the only acceptance criterion.
Step 6 — Packaging
Protect the shaft, resolver connector, and cooling components separately. Use ESD-conscious handling around the feedback electronics and prevent packaging forces from being transferred into the shaft or bearings.
Field Engineer’s Pitfall Guide
❗ Do not confuse resolver feedback with a digital encoder.
The is documented with a resolver. The replacement drive must support the required feedback architecture and configuration.
❗ Do not size this motor by kW alone.
The published operating point is 3.9 kW at 3,455 RPM and 10.8 Nm, while the same motor family documentation identifies a different 60 Hz operating point. Verify the machine’s actual drive setup before commissioning.
❗ Forced ventilation is part of the system.
This is not simply a naturally cooled motor with an optiohe is documented as forced ventilated. Verify the cooling hardware and airflow before putting the motor back into continuous service.
Intent-Driven FAQ
Q1. What ze ?
It is a Lenze MDFKA asynchronous servo motor with resolver feedback and forced ventilation.
Q2. What is the rated power?
The documented rating is 3.9 kW at the 3,455 RPM operating point.
Q3. What are the voltage and current ratings?
Published technical records specify 390 V and 9.1 A.
Q4. What is the rated speed?
The documented rated speed is 3,455 RPM. The corresponding published torque is 10.8 Nm.
es use an encoder?
The documented feedback device is a resolver, not a conventional incremental encoder.
Is discontinued?
Current industrial replacement records identify the model as discontinued by the manufacturer. This makes exact model verification particularly important when sourcing replacement inventory.
Q7. Can any MDFKA 080 motor replace it?
No. Confirm the complete model, winding/operating point, resolver configuration, mechanical interface, cooling arrangement, and drive parameters before substitution.
Procurement Note
For legacy-machine sourcing, use the complete identifier rather than searching only for “Lenze MDFKA 080.” The exact suffix carries configuration information, and available records show that this model family can have materially different operating points.
