Description
The Rexroth Indramat MKD071B-061-GG0-KN is a synchronous AC servo motor designed for high-performance industrial automation, machine tools, and packaging lines. It features a brushless design with permanent magnets, delivering high operational reliability and a maintenance-free lifecycle. This specific model provides a nominal torque rating of 8.0 Nm, a maximum speed rating of 5,000 RPM, and comes equipped with an integrated resolver for closed-loop feedback and a plain output shaft with a shaft sealing ring.
Commercial Availability & Procurement
| Lifecycle and Logistics | Status & Details |
| Product Condition | New Surplus (Factory Sealed) or Factory Refurbished (Tested under full dynamometer load) |
| Warranty | 12-month comprehensive warranty covering parts and performance |
| Availability | Available; typical dispatch within 24 to 48 hours from order confirmation |
| Pricing Note | Pricing fluctuates based on market availability and raw material costs. Contact our team for an official, time-bound quotation. |
Technical Specifications
| Parameter | Specification / Value |
| Motor Type | Digital AC Synchronous Servo Motor |
| Frame Size | MKD071 (Flange Size: 115 mm) |
| Motor Length | B (Continuous Stall Torque: 8.0 Nm) |
| Winding Code | 061 (Optimized for 5,000 RPM maximum speed) |
| Feedback System | G (Integrated Resolver, multiturn absolute feedback capability) |
| Output Shaft | G (Plain shaft with a shaft sealing ring; no keyway) |
| Holding Brake | 0 (No integrated holding brake) |
| Connection Type | K (Terminal box connection; output direction can be adjusted on-site) |
| Housing Design | N (Standard, natural convection cooling) |
| Insulation Class | F (Up to 155 °C winding temperature limits) |
| Protection Category | IP65 (Dust-tight and protected against water jets) |
Part Number Breakdown & Nomenclature
Understanding the precise engineering configuration of the MKD series prevents mismatched field replacements.
- MKD071: Defines the physical frame size (115 mm centering diameter, 130 mm bolt hole circle).
- B: Corresponds to the rotor length. Longer stacks increase the available active torque output (M_0).
- 061: Specifies the electrical winding behavior. This dictates the voltage-to-speed ratio (K_v constant) and matching drive amplifier current thresholds.
- G: Indicates an onboard resolver feedback system. This transmits absolute positioning values within one mechanical revolution back to the drive.
- G: Signifies a smooth, plain output shaft equipped with an elastomeric shaft sealing ring. This prevents oil ingress from attached gearboxes (compliant with DIN 3760).
- 0: Confirms the absence of a mechanical 24 VDC holding brake. Do not use this specific model for vertical or gravity-loaded axes without independent external braking mechanisms.
- K: Specifies a terminal box connection instead of quick-disconnect bayonet plugs.
- N: Indicates a standard enclosed housing that relies entirely on natural convection through the machine frame for thermal dissipation.
Field Integration & Drive Pairing
In field deployments, the MKD071B-061-GG0-KN is natively paired with Rexroth Indramat Diax04 (DDS series) or EcoDrive (DKC series) digital drive controllers.
Installation and Commutation Commissioning
Because this motor uses an analog resolver for feedback, correct electrical phasing is essential. The motor’s internal encoder data memory sheet (feedback parameters) is automatically read by the drive unit upon initialization via the feedback cable.
Critical Field Note: When replacing an older MKD motor, ensure the shaft sealing ring is lubricated with a thin layer of non-conductive grease before mounting it to a gearbox. Running a dry sealing ring against a high-speed shaft will cause localized overheating, leading to premature seal degradation and fluid migration into the motor winding stator.
Cable and Connection Schematics
The “K” configuration utilizes internal terminal blocks inside an integrated junction box:
- Power connections (U1, V1, W1, and PE) must be torqued to the specifications found inside the junction lid.
- The feedback/resolver cable must be shielded independently from the high-voltage power lines to prevent EMI noise insertion, which causes intermittent velocity loop faults or drive dropouts (typically triggering an “A101” or “F226” error code on Rexroth drives).
Frequently Asked Questions
Q: Can I replace a motor that has a keyway (shaft code “P”) with this plain shaft (“G”) model?
Mechanically, yes, provided your coupling or gearbox utilizes a compression-style shrink disc or clamping hub. You cannot use a plain shaft motor with a traditional keyed sprocket or coupling, as there is no key slot to transfer mechanical torque, which will cause the shaft to slip under load.
Q: What is the primary indicator that the internal resolver or feedback system has failed?
The drive controller will trip almost immediately on power-up or upon enabling the RF (Ready to Function) signal. Common fault codes include F226 (Undervoltage in motor encoder) or F228 (Excessive deviation in commutation position). If these occur, isolate the motor and check the continuity of the resolver windings across the feedback pins. Verify with the OEM manual for exact resistance values.
Q: Can this motor be utilized on a vertical Z-axis?
No, because this specific configuration (-GG0-) lacks an integrated holding brake. When control power is removed or an emergency stop is triggered, a vertical axis will drop due to gravity. For vertical axes, a model with an integrated 24 VDC holding brake is mandatory.
