WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Product Model: MKD041B-144-KG1-KN
Product Brand: Bosch Rexroth (Indramat)
Product Series: MKD Synchronous Motor / Frame 041
Product Features:
- Continuous standstill torque of ~2.7 Nm with 34 A peak current support
- Combined resolver + integrated multiturn absolute encoder feedback
- Integrated 2.2 Nm holding brake (24 V DC) for load retention when de-energized
- Compact 82 mm flange, 50 mm centering, IP65 protection, natural cooling
Applications & Industry Context
In modern automated systems, the MKD041B-144-KG1-KN often lives in axes where precision, responsiveness, and compactness are key constraints. Its relatively modest torque, high speed capacity, and built-in brake make it ideal for medium-load tasks across many industries.
In packaging and labeling machines, you’ll commonly see this motor on smaller indexing turntables, label applicators, or web tension control axes. The 2.7 Nm continuous torque provides enough “stiffness” to maintain position under small disturbances, while the encoder ensures accuracy in repeatable motions.
In electronics assembly and pick-and-place systems, where repeatability and speed are critical, the MKD041B-144-KG1-KN offers a compact footprint that helps keep axes short and accelerations tight. The low rotor inertia and combined feedback help minimize settling time after moves.
In test rigs, metrology systems, or small robotic axes, its dual feedback (resolver + absolute encoder) is a boon: the resolver gives high-frequency, noise-resistant feedback for servo control, while the absolute encoder enables safe recovery after power loss or position loss. In many labs or measurement setups, the ability to maintain coordinate integrity (without a full homing routine) is a big advantage.
Given its IP65 housing, the motor tolerates moderate exposure to dust or occasional low-pressure wash jets (in compact enclosures), making it suitable for factory cells or semi-industrial settings. But in harsher environments (wet, high spray, heavy particulates), additional protection (cover plates, sealed housings) is typically used.
In retrofit projects, especially those upgrading older Rexroth MKD systems, the MKD041B-144-KG1-KN often replaces older models (e.g. different winding codes) to boost performance or extend life. Because it shares the same 041 frame geometry, many mechanical mounts and coupling arrangements remain valid, easing integration.
In sum: it’s not a heavy-duty spindle motor, but in many mid-range motion applications where accuracy, compact form, and manageable torque are needed, the MKD041B-144-KG1-KN is a strong candidate.
- MKD041B-144-KG1-KN
Product Role & System Fit
The MKD041B-144-KG1-KN is a synchronous permanent-magnet servo motor, designed to act as the final actuator in a motion system. The typical topology is: servo controller or motion CPU → drive (e.g. Rexroth Ecodrive, DKC series, Diax series) → motor. The drive commands current and voltage, while the motor responds with torque and rotation; feedback (resolver or encoder) closes the loop.
Because MKD041B-144-KG1-KN includes both a resolver and an integrated multiturn absolute encoder, it fits well into systems that demand either fast closed-loop control or safe position recovery. After a power-off event, the absolute encoder can report the correct axis position (over multiple revolutions)—so you often avoid mechanical homing or limit cycling. This characteristic makes the motor more resilient in high-availability or precision systems.
This motor is compatible with Rexroth’s Diax04, Ecodrive, and DKC family drives (or drives that support the feedback interfaces and current/voltage envelope) as often cited in datasheets of the R911260465 designation (which corresponds to MKD041B-144-KG1-KN). The nominal geometry (041 frame, “B” length) means that it can often drop into existing mounts designed for MKD041 motors, preserving machine architecture.
Because of its compact size and feedback sophistication, it’s well suited to machines where multiple axes are crowded, or where retrofit flexibility is key. A single control cabinet can host multiple drives and motors of MKD041 family, making spares or substitution easier.
However, care must be taken with wiring, grounding, shielding, and feedback matching. The absolute encoder, resolver, brake, and power lines must be correctly wired, shielded, and terminated per Rexroth’s instructions, or else noise, loss of feedback, or fault trips may occur. That leads us toward the installation considerations below.
Technical Features & Benefits
Let’s dig into what makes MKD041B-144-KG1-KN a compelling option—beyond specs, toward real-world operational advantages.
Dual Feedback Robustness
A standout feature is the resolver + integrated multiturn absolute encoder arrangement. The resolver provides high-speed, low-latency feedback suitable for tight servo loops. If power is lost or the system reboots, the absolute encoder gives the absolute position (even across multiple full rotations, typically > 4096 revolutions) so you don’t need to re-home axes every startup. That saves time and reduces mechanical wear.
Holding Brake for Safety
When de-energized, the motor’s 2.2 Nm holding brake (24V DC brake coil) ensures load retention. That’s critical in vertical axes, inclined transport systems, or those that must maintain position during power loss. The brake is integrated without significantly increasing rotor inertia, so the dynamic performance is still excellent.
Good Speed Range & Responsiveness
With a maximum speed rating of ~7,500 rpm (or near that, depending on variant) this motor handles both high-speed indexing and moderate torque work. The relatively low rotor inertia (1.7 × 10⁻⁴ kg·m², per datasheet) helps quick acceleration and deceleration—especially useful in punch/die, packaging, or pick-and-place where stops/starts dominate.
Compact Geometry & Mechanical Compatibility
The motor’s 82 mm flange, 50 mm centering, and “B” length dimension mean it often fits into compact axis designs. The plain shaft (often with seal) allows coupling to gearboxes or direct drive, and the mechanical design supports moderate radial/axial loads (per general Rexroth/Indramat guidelines) . Being from the MKD041 family, mounting patterns often align with other MKD041 variants, which helps when swapping or standardizing across a machine fleet.
Reliability & Proven Legacy
MKD motors have been field proven over many decades; spare parts, repair knowledge, documentation, and community expertise exist. For many factories, that continuity is a deciding factor: the MKD041B-144-KG1-KN isn’t exotic—maintenance teams often already know how to treat them. That helps reduce downtime risk.
Thermal & Protection Aspects
The IP65 rating gives decent protection against dust and light water exposure (e.g. low-pressure spray) when installed properly. The natural cooling design usually suffices in moderate ambient conditions, though forced-air or external cooling may be considered in tighter or hotter cabinets
Given all of the above, MKD041B-144-KG1-KN represents a mature mid-tier motor balancing precision, moderate torque, and practical integration for many motion control tasks.
Technical Specifications Table
| Parameter | Value / Range | Comments / Notes |
|---|---|---|
| Model | MKD041B-144-KG1-KN | |
| Motor Type | 3-phase synchronous permanent magnet | |
| Continuous standstill torque | ~2.7 Nm | Steady retention torque with no speed |
| Peak / theoretical torque | ~11.3 Nm | Short-duration capability under high current |
| Holding brake torque | 2.2 Nm (24 V DC) | Helps secure load when powered off |
| Maximum speed | ~7,500 rpm | Upper speed bound for indexing or high-speed duty |
| Continuous (stall) current | ~7.5 A | Nominal current when at zero speed under torque load |
| Peak current | 34 A | Short-term max current demand |
| Winding resistance | ~1.8 Ω | Electrical resistance of winding at reference temperature |
| Centring diameter | 50 mm | For mechanical alignment in mounts |
| Flange size | 82 mm | External mounting interface |
| Protection class | IP65 | Dust tight, protected against low-pressure water jets |
| Cooling mode | Natural convection | Standard cooling, no forced blower unless specified |
| Rotor inertia | 1.7 × 10⁻⁴ kg·m² | Enables agile dynamics |
| Insulation class | Class F | Thermal tolerance of winding insulation |
| Weight | ~4.4 kg | Approximate mass of motor unit |
Bear in mind: these figures come from published datasheets and catalogs. Always consult the exact nameplate or certifiable documentation for any mission-critical deployment.
Installation & Maintenance Insights
Getting the MKD041B-144-KG1-KN working reliably in your system relies heavily on attention to wiring, mounting, thermal environment, and feedback integrity.
Mounting & Mechanical Setup
Ensure the motor is mounted solidly and aligned accurately. Deviations in coupling, angular misalignment, or excessive radial/axial loads can prematurely wear bearings or degrade performance (a general guideline in MKD motor documentation). Use correct key sizes (per DIN standards) and respect coupling tolerances. Avoid applying force to the shaft during installation—support the flange or use lifting points.
Ensure that the environment allows adequate clearance (air path) so that natural convection can remove heat. Do not obstruct the motor perimeter or enclose it tightly without ventilation, unless auxiliary cooling is provided.
