Description
The Rexroth Indramat A403706 (factory designated by the primary type code MAC093B-0-OS-4-C/110-A-0/WI522LV) is a high-performance permanent magnet AC synchronous servo motor. Engineered for use with Indramat TDM, KDS, or DDS drive controllers, this brushless servo motor delivers precise speed and position control in heavy-duty machine tool axes, printing presses, and high-velocity packaging applications. It features a closed housing design with natural convection cooling and utilizes integrated feedback instrumentation for dynamic loop synchronization.
Technical Specifications
| Parameter | Value / Detail |
| Model Number | MAC093B-0-OS-4-C/110-A-0/WI522LV |
| Material / Part Number | A403706 |
| Motor Frame Size | MAC093 (Flange size: 130 mm nominal) |
| Motor Length Suffix | B (Extended rotor core for higher torque density) |
| Continuous Torque at Stall (M_{dn}) | 9.0 N·m (nominal at \Delta T = 60 K) |
| Continuous Current at Stall (I_{dn}) | 14.5 A |
| Maximum Rotational Speed (n_{max}) | 3,000 rpm |
| Feedback System | Integrated Tacho-generator (integrated with specialized encoder/resolver feedback) |
| Centering Diameter | 110 mm standard flange layout |
| Shaft Design | Plain cylindrical shaft with sealing ring (no keyway) |
| Enclosure Rating | IP65 according to IEC 60529 (fully dust-tight and jet-water resistant) |
| Insulation Class | Class F (up to +155 °C operating threshold) |
Technical Features & Field Engineering Context
Brushless AC Synchronous Design
The MAC093B core relies on high-coercivity rare-earth permanent magnets bonded to the rotor structure. This eliminates physical carbon brushes, drastically reducing routine maintenance cycles and spark hazards in industrial settings. The three-phase stator windings distribute heat directly to the outer aluminum extrusion housing, relying on natural chimney convection for heat dissipation. When mounting inside enclosed machine castings, ensure a minimum of 100 mm clearance around the motor frame to prevent heat soaking, which can prematurely degrade winding insulation during high-duty cycle cycles.
Shaft Ingress and Mechanical Seals
The plain shaft configuration designated in the type code provides precise, concentric coupling alignment.
- Ingress Protection: The IP65 rating depends heavily on the maintenance of the dynamic shaft sealing ring.
- Field Constraint: During a 2 AM emergency axis swap, verify that the gearbox or coupling sleeve does not pinch or dry-run the shaft seal. Operating the motor with a damaged shaft seal allows oil or coolant liquid to travel down the shaft, flooding the internal feedback housing and causing immediate encoder fault alarms.
Feedback Calibration and Phase Synchronization
The internal feedback package requires precise alignment with the rotor’s magnetic fields. If the motor is decoupled from its original drive configuration or undergoes terminal block service, technicians must use an oscilloscope to check that the commutation signals align correctly with the back-EMF waveforms. Mismatched phasing will cause the drive controller to draw excessive current at stall, leading to thermal overloads or immediate overcurrent trips upon enabling the axis.
Commercial and Logistics Status
- Condition: Refurbished (Fully cleaned, stator insulation tested, bearings replaced with high-speed variants, and spin-tested on a closed-loop Indramat test chassis) or New Surplus.
- Warranty Period: 12-month comprehensive electrical and mechanical warranty from the date of cargo dispatch.
- Global Lead Time: Standard refurbished configurations ship within 4 to 7 business days via heavy freight networks.
- Documentation: Ensure visual verification of the structural type code string on the physical nameplate prior to initializing full parameter matching via the drive configuration software.
Commercial Note: The Indramat MAC legacy motor family is classified as mature and out of current production by the OEM. Global market availability varies based on manufacturing turnarounds and core-exchange volumes. Surcharges may apply if an exchange core is not provided. Contact our solutions desk for a firm, itemized commercial quotation.
Frequently Asked Questions
Can this motor be utilized on a standard generic VFD?
No. The MAC093B-0-OS-4-C/110-A-0/WI522LV is a specialized synchronous servo motor requiring precise timing feedback for commutation. Running it across a generic scalar or open-loop vector Variable Frequency Drive (VFD) will fail to generate stable torque and will likely overheat the permanent magnets, causing permanent demagnetization.
What is the specific function of the plain shaft configuration versus a keyway design?
The plain shaft minimizes mechanical backlash during rapid high-frequency reversals typical in CNC axis control loops. Keyed shafts can develop structural clearance tolerances over millions of acceleration cycles, which introduces microscopic positioning drift and structural keyway deformation under high shock loads.
How do I troubleshoot a sudden thermal fault code from this motor on a DDS drive?
First, isolate primary power and measure the resistance of the internal thermistor loop at the motor connector pins. If the resistance shows an open circuit at room temperature, the internal thermal sensor has failed or a broken trace exists in the feedback cable. If the resistance tracks correctly, check the mechanical axis for binding or friction that could overload the motor.
