In core high-end automation applications such as precision alignment, high-speed closed-loop feeding, mobile independent drives, and cleanroom operations, general-purpose servo motors typically suffer from high electromagnetic torque ripple, operational redundancy in incremental encoder systems, limited bus protocol compatibility, temperature rise drift under continuous load, insufficient environmental protection robustness, and low dynamic response bandwidth. As a result, they cannot meet the motion control requirements for high-frequency commutation and micrometer-level positioning, multi-axis clock synchronization, integration in confined spaces, and complex operating conditions involving alternating dry and wet environments. The Moons Servo Motor is based on a proprietary low-cogging electromagnetic topology, slotless concentrated winding process, passive multi-turn absolute feedback, and an integrated drive architecture. It utilizes highly oriented silicon steel laminations, an F-class temperature-resistant insulation system, high-coercivity permanent magnets, and an age-hardened die-cast aluminum housing. The motor is precision-manufactured through vacuum pressure impregnation of the windings, G-class high-precision dynamic balancing, and a multi-layer labyrinth seal encapsulation process. The product portfolio covers the SM3 high-voltage AC split-type series, the M2DC/MBDVmini low-voltage DC series, and the MDX+ mechatronics integrated servo series. These products enable high-bandwidth closed-loop torque control, drift-free position control, and low-hysteresis multi-axis synchronous motion, addressing industry pain points-such as traditional servo torque fluctuations, coordinate loss upon power failure, thermal degradation during continuous operation, communication timing jitter, and fatigue failure under alternating loads-at the structural level.
Moons servo motors are precision permanent magnet synchronous actuators characterized by low ripple, maintenance-free operation, high integration, and wide operating conditions. The split-type models are compatible with the split layout of standardized electrical control cabinets, while the integrated models eliminate external drive links and significantly simplify equipment wiring structures. They are suitable for advanced automation scenarios such as precision semiconductor alignment, high-speed lithium-ion battery manufacturing processes, medical cleanroom equipment, AGV mobility drives, and heavy-duty gantry feed systems. Based on industrial motion control verification standards, this article systematically explains the performance characteristics, closed-loop control mechanisms, structural and material limitations, operating condition adaptation logic, and precision assembly specifications of Moons servo motors. It assists mechanical and electrical control engineers in completing inertia matching, power selection, protection rating determination, and bus adaptation, thereby avoiding issues such as resonance vibration, accuracy degradation, thermal failure, and reduced overall system stability caused by parameter mismatches.
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Product Highlights
The core characteristics of the Moons Servo Motor are low cogging torque and high dynamic response, maintenance-free multi-turn absolute feedback, integrated full-range safety functions, and wide-temperature-range, high-protection, weather-resistant design-which also represent its fundamental differences from general-purpose servo motors. Stripping away common industry jargon and drawing on servo closed-loop dynamics, we distill four core advantages:
Low-cogging electromagnetic design ensures dynamic response without lag. Proprietary skewed-pole permanent magnet + slotless winding design suppresses cogging torque to within 3% of rated torque, increases current response bandwidth by 40%, and achieves peak torque of up to 350% of rated value. It ensures vibration- and jitter-free high-frequency acceleration/deceleration and short-cycle reciprocating motion, as well as micrometer-level positioning at low speeds without speed fluctuations, making it suitable for high-speed precision feeding and vision-synchronized tracking applications.
Battery-free multi-turn encoding eliminates the need for home position reset throughout the entire process. The entire product line comes standard with a battery-free magnetoelectric multi-turn absolute encoder that permanently retains the mechanical position in the event of a power loss, eliminating the need to return to zero upon restart and saving on home position sensor hardware costs. It supports ultra-high resolution of up to 26 bits, and full closed-loop control can integrate with secondary feedback from optical encoders to completely eliminate positioning errors caused by transmission backlash.
Tiered protection and safety architecture ensure stable operation in harsh environments. Standard models feature IP65 protection, while shaft-extended sealed versions achieve IP67. Class F insulation withstands temperatures up to 155°C and supports STO SIL3 safety torque off, dynamic braking, and multiple protections against overload, overcurrent, and overtemperature; The MDX+ integrated model features dual independent power supplies for power and control. In the event of a fault, the power circuit is disconnected without losing the control signal, significantly enhancing equipment operation and maintenance safety.
Modular compatibility across multiple product lines supports both integrated and split-type configurations. The AC SM3 series covers the full power range from 50W to 7.5kW, suitable for heavy-duty gantry systems and large-scale machining equipment; The low-voltage M2DC/MBDVmini, powered by 24–80 VDC, is suitable for small AGVs and micro-medical devices; the MDX+ integrated servo system combines the drive, motor, and encoder into a single unit, eliminating the need for control cabinet wiring and making it suitable for compact, custom-built equipment. It natively supports multiple bus protocols-including EtherCAT, CANopen, and RS485-and is compatible with mainstream controller platforms.
Core Operating Principles of the Product
The core operating mechanism of the Moons Servo Motor is built upon four major technological systems: low-ripple permanent magnet synchronous commutation, high-resolution real-time closed-loop sampling, adaptive dynamic vibration suppression, and multi-level hardware safety interlocks. This systematically addresses the structural defects commonly found in traditional servos, such as position memory loss in incremental encoders, low-speed step-response jitter caused by cogging torque, long-term insulation thermal aging under full load, and compatibility limitations inherent in single-bus architectures.
Under both steady-state and dynamic operating conditions, the proprietary drive unit outputs high-precision sinusoidal three-phase excitation current, which excites the stator windings to generate a uniform rotating magnetic field. Through magnetic coupling, this field drives the permanent magnet rotor to rotate synchronously; The integrated ultra-high-resolution passive multi-turn sensing unit continuously captures the rotor's mechanical angular displacement, real-time rotational speed, and turn coordinates, continuously transmitting high-precision feedback data to the upper-level drive system. This establishes a comprehensive three-loop closed-loop control system encompassing current, speed, and position, enabling millisecond-level dynamic correction and precise phase tracking.
To address extreme dynamic operating conditions in automated equipment-such as high-frequency starts and stops, rapid direction changes, and sudden load variations-the motor incorporates built-in adaptive inertia identification and multi-order resonance suppression algorithms. These algorithms can identify the load inertia ratio in real time and dynamically adjust closed-loop gains and filtering parameters, effectively eliminating low-frequency resonance and speed fluctuations caused by elastic deformation of the drive train and micro-vibrations in the frame, thereby completely resolving issues such as low-speed crawling and positioning inaccuracies. Its passive magnetoelectric multi-turn position sensing structure permanently latches mechanical absolute coordinates without requiring an external energy storage unit, eliminating the need for origin reset procedures following power outages, restarts, or emergency stops, thereby significantly improving the continuous uptime of production lines.
The entire unit is equipped with an integrated safety monitoring and interlock circuit that continuously samples core operating parameters-such as winding operating current, operating temperature rise, and output torque-in real time across the entire operating range. Should any abnormal thresholds for overload, short circuit, or overheating be triggered, the STO SIL3 safety torque off (STO) circuit activates instantly to physically cut off the power excitation output; When paired with an optional power-off self-locking braking unit, it achieves zero-drift locking of the vertical axis system, eliminating the risk of gravitational load drops. Additionally, the windings undergo a fully sealed vacuum pressure impregnation process, resulting in a dense, pore-free insulation layer that effectively blocks the ingress of moisture, dust, and light oil contaminants. This maintains the stability of electromagnetic parameters and insulation consistency under wide-temperature cycling and mildly contaminated operating conditions, preventing long-term performance degradation.
Compared to general-purpose permanent magnet synchronous servos, the Moons Servo Motor is a high-precision, operating-condition-adaptive power actuator. It deeply integrates low-cogging electromagnetic optimization, passive maintenance-free sensing technology, intelligent dynamic control, hardware-level functional safety protection, and a modular multi-protocol architecture, thereby addressing the performance shortcomings of traditional servos in precision micro-motion, high-frequency dynamics, compact integration, and clean, weather-resistant environments. Its core value lies in achieving low-ripple power output under all operating conditions, multi-axis clock-synchronized control, permanent position retention during power outages, and long-term stable operation in harsh environments. These capabilities directly determine the motion repeatability, dynamic response characteristics, and overall service life of high-end automation equipment, making it the central executive component of high-precision closed-loop motion control systems.
Product Showcase
Product Structure and Materials
Moons servo motors are designed in accordance with the standard permanent magnet synchronous architecture. They are precision-machined around four key dimensions: electromagnetic power output, high-precision position feedback, safe braking, and sealed protection. The stator windings, rotor magnets, and housing flanges all undergo stress-relief aging treatment to eliminate residual stresses from machining; The entire product series shares a unified set of core components, including a die-cast aluminum alloy housing, stator electromagnetic windings, permanent magnet rotor assembly, multi-turn absolute encoder, electromagnetic brake assembly, output shaft extension, and sealed end caps. These components work in concert to balance electromagnetic losses, heat dissipation efficiency, and sealing performance. Heavy-duty, long-shaft models feature an additional reinforced bearing structure at the shaft end. Detailed structural parameters are shown in the table below:
| Structural Component | Brief Introduction | Core Requirements |
| Die-cast Aluminum Alloy Housing | Main load-bearing and heat dissipation base of the whole machine, which encloses the stator winding, conducts heat from electromagnetic loss, and reserves the mounting reference for the standard flange. | Integrally formed from high-silicon die-cast aluminum alloy, with uniform wall thickness and complete heat dissipation channels; hard anodized surface for corrosion protection, housing temperature rise ≤35K during long-term continuous operation, and flatness of the flange end face ≤0.015mm. |
| Stator Electromagnetic Winding | Core carrier for electromagnetic commutation, which generates a rotating magnetic field when three-phase current is applied, and determines the motor torque, response speed and heating characteristics. | Laminated with ultra-thin high-conductivity silicon steel sheets, sealed by vacuum epoxy impregnation; Class F 155℃ insulation, winding inductance matched with low-cogging design, no risk of interphase insulation breakdown, and no insulation aging under long-term full load operation. |
| Permanent Magnet Rotor Assembly | Magnetic field coupling rotating component, equipped with high remanence neodymium iron boron magnets, which outputs rotational power synchronously following the stator magnetic field. | Adopts skewed pole segmented magnet bonding process, magnet demagnetization resistance temperature ≥130℃; overall dynamic balance grade of the rotor is G2.5, no eccentric vibration during high-speed operation, and no magnet falling off under long-term alternating torque. |
| Multi-turn Absolute Encoder | Core sensing unit for closed-loop feedback, which collects rotor angle, rotational speed and multi-turn mechanical coordinates, and provides raw data for closed-loop control. | Battery-free magneto-electric induction structure, maximum 26-bit resolution; vibration and shock resistant, stable output in the temperature range of -20~70℃, no frame loss in communication timing, and no need for regular replacement of backup batteries. |
| Electromagnetic Braking Assembly | Power-off locking safety structure, which blocks the free rotation of the shaft under vertical load conditions and prevents displacement caused by gravity sliding. | Spring-loaded power-off braking design, rated holding torque is more than 1.2 times the rated torque of the motor; braking response time ≤15ms, no friction dust precipitation, suitable for clean and aseptic working conditions. |
| Output Shaft Extension | Reference shaft for power output connection, which transmits torque with couplings and reducers, and is available in multiple specifications including flat key, expansion sleeve and smooth shaft. | Quenched and tempered finish machining of 40Cr steel, surface high-frequency quenching hardness HRC42~48; precise roundness and cylindricity of the shaft end, radial runout ≤0.02mm, and no torsional deformation of the shaft body under long-term alternating torque. |
| Sealing Protection End Cover | Dustproof and waterproof sealing structure of the whole machine, which isolates water vapor, dust and cutting fluid from intruding into the internal winding and encoder. | Composite sealing with fluororubber skeleton oil seal + multi-layer labyrinth dustproof groove; standard model with IP65 protection, reinforced sealing model with IP67 protection; no hardening or cracking of the rubber under high and low temperature environment, and no medium penetration to corrode internal components. |
In addition to the common basic structure, customized designs have been developed for specific product lines: The MDX+ integrated servo model eliminates the external drive wiring compartment; the housing integrates the power board, control board, and heat sinks, reducing the overall unit volume by 30%; The MBDVmini micro 20-frame model uses a slotless flat stator, significantly reducing rotational inertia to accommodate high-speed micro-devices; for high-temperature drying applications, an independent cooling air duct is added to enhance heat exchange efficiency; food and medical cleanroom models eliminate exposed lubricating grease structures, and all seals use food-grade fluororubber.
The selection of base materials requires cross-verification based on five key motion control parameters: rated power, load inertia, operating voltage, ambient temperature and humidity, and protection rating. The boundaries for base materials and electromagnetic solutions vary clearly across different product lines. A specialized analysis of the compatibility boundaries for mainstream series is provided below:
SM3 AC High-Voltage Servo Series: A versatile, heavy-duty workhorse model featuring a stator with thickened silicon steel laminations and a large neodymium-iron-boron rotor. Available in three rotor inertia levels-low, medium, and high-the high-inertia version is suitable for heavy loads with low-frequency start-stop operations, while the low-inertia version is ideal for high-speed, short-cycle reciprocating motion. With IP65 protection, it is suitable for lithium-ion battery systems, CNC gantry machines, and large-scale packaging production lines.
M2DC Low-Voltage DC Servo: A model specifically designed for mobile equipment, featuring a lightweight aluminum alloy housing and low-inductance slotless windings. It supports onboard DC power supply and eliminates the risk of high-voltage electric shock, making it suitable for AGV robots, small transplanting equipment, and precision laboratory fixtures.
MBDVmini Micro DC Servo: Designed exclusively for micro-precision equipment, featuring an ultra-thin slotless stator and a micro magnetoelectric encoder. With an overall diameter of ≤22 mm, it fits into extremely tight installation spaces and is suitable for semiconductor chip mounting and medical micro-feed devices.
MDX + Integrated Servo: A driverless, all-in-one model with a housing that integrates the power circuit and heat dissipation structure. It features dual independent power supplies and built-in STO safety functionality, eliminating the need for control cabinets and long cables. Suitable for compact filling machines, small turnstiles, and desktop automation equipment.
Additional Notes on Operating Conditions: Models with basic oil seals must not be used in environments with moisture or acidic/alkaline water mist; an upgrade to IP67 fluororubber seals is required. For production lines with prolonged high-temperature drying at 150°C or above, a custom version with high-temperature, demagnetization-resistant magnets is required. For high-impact and transient overload conditions, the torque safety margin must be ≥2.8 times; do not use low-power micro-motors with low peak torque. Standard iron housings have poor heat dissipation and are prone to rust; the entire Moons servo series uniformly adopts die-cast aluminum alloy housings and does not use cast iron blanks.
Common Applications and Uses
Moons Servo Motors are specifically designed for high-precision positioning, high-frequency dynamic reciprocating motion, multi-axis synchronized operation, compact integrated layouts, and cleanroom servo drive applications in humid and dusty environments. They are suitable for any automated equipment requiring closed-loop precision motion control, zero-return-to-zero capability upon power loss, and multi-bus coordination, covering six core industries: semiconductor and electronics, lithium-ion battery and new energy, medical and sterile equipment, logistics AGVs, heavy-duty CNC machines, and packaging and sorting.
The semiconductor and precision electronics sectors are the core application areas. Wafer alignment platforms, PCB labeling equipment, and micro-displacement detection mechanisms impose stringent requirements for low-speed jitter, positioning repeatability, and dust protection. Moons micro slotless low-voltage servos, paired with 26-bit absolute encoders, eliminate cogging at low speeds; IP65 sealing prevents dust from entering the windings; and fully closed-loop optical grating feedback eliminates transmission backlash, ensuring micron-level alignment accuracy and reducing product defect rates.
In the field of lithium-ion battery automation-including electrode sheet cutting, cell winding, and heavy-duty gantry equipment for battery handling-operations involve high-speed starts and stops, heavy load impacts, and 24-hour continuous operation. The SM3 high-power AC servo delivers 350% peak torque; its adaptive vibration suppression algorithm counteracts gantry resonance, while multiple overheat and overload protections support long-term, uninterrupted production. The absence of battery encoders eliminates the need for production line restart and zero-return procedures, thereby improving equipment utilization rates.
In the medical sterile equipment sector-including medical testing fixtures, pharmaceutical filling and conveying systems, and sterilization and cleaning drive mechanisms-requirements include no metal debris release, washability for disinfection, and no oil contamination. The entire unit features food-grade sealed fluororubber components, dust-free electromagnetic braking, optional 304 stainless steel shaft extensions, and waterproof seals suitable for periodic washing and disinfection, all in compliance with medical clean production standards.
In the AGV and mobile robotics sector-including warehouse handling AGVs and intelligent inspection pan-tilt units-the equipment operates exclusively on 24/48V DC power and features a compact spatial layout. The M2DC low-voltage DC servo is compatible with onboard DC power supplies; its lightweight design reduces the vehicle's overall weight, while the EtherCAT bus enables rapid synchronization of multi-axis movement and steering mechanisms. Coordinate memory retention during power loss eliminates the need for re-calibration.
In the heavy-duty CNC and packaging/sorting sectors-including gantry engraving and milling feed axes and high-speed food sorting lines-equipment features large travel ranges and fast cycle times. The high-inertia SM3 servo balances and distributes long-distance dynamic loads, while STO (Safe Torque Off) ensures the safety of both equipment and personnel. Compatibility with multiple bus protocols allows for seamless integration with various domestic controllers, facilitating convenient commissioning and adaptation.
In addition, these motors are widely compatible with niche motion applications such as photovoltaic wafer processing equipment, precision textile printing machinery, automated laboratory testing fixtures, and small smart turnstiles. In the field of high-precision, highly integrated, and high-safety-level servo drives, they offer intelligence and environmental adaptability that cannot be matched by general-purpose split-type servo motors.
Key Points of Precision Assembly
Moons servo motors are high-precision closed-loop power actuators. The fit of the flange, the coaxiality of the shaft extension, the tightness of the cable seal, and the control of brake clearance directly affect the overall precision and service life of the unit. Rough assembly can easily lead to eccentric vibration of the shaft extension, water ingress causing short circuits in the seal, accelerated friction wear of the brake, and abnormal encoder signals. Assembly must strictly adhere to four advanced process principles: cleaning and debris removal from reference surfaces, pre-assembly for coaxial alignment, graded torque tightening, and dynamic closed-loop verification under power. This approach avoids generic assembly terminology and aligns with the professional language used throughout this document:
Preliminary Ultra-Clean Surface Preparation and Parameter Verification: Use anhydrous isopropyl alcohol to clean the reference surfaces of the equipment mounting frame, the motor flange end faces, and the mating section of the output shaft extension, thoroughly removing metal shavings, rust-preventive grease, and oxidized burrs. Hard impurities can cause misalignment in flange contact and eccentricity in the shaft-end coupling; Verify the equipment's load inertia, peak torque, and maximum operating speed; ensure the safety margin of the motor's rated parameters is ≥1.5 times; inspect for hidden defects such as housing dents or deformation, damaged oil seals, cracked encoder cables, and excessive brake clearance; and standardize the assembly reference for the entire servo shaft system.
High-precision coaxial alignment during pre-assembly: Smoothly align the Moons servo motor flange with the frame's mounting reference, ensuring the flange surface remains flat throughout the process with no localized overhang or one-sided warping; when connecting the coupling or gear reducer, maintain the shaft's coaxial alignment; do not pry or strike the shaft with excessive force from one side to prevent damage to the shaft end's hardened layer or one-sided impact on the internal bearings; For models with brakes, manually rotate the shaft before pre-assembly to confirm that the brake releases without sticking and that the clearance is uniform.
Tighten in stages using a diagonal torque sequence: Tighten the flange mounting bolts using a diagonal, cross-pattern, step-by-step tightening process, applying force uniformly at three standard torque levels (50%, 80%, and 100%) to avoid twisting of the aluminum alloy housing or excessive radial runout of the shaft extension caused by over-tightening at a single point; After tightening is complete, remeasure the flange end face runout and shaft radial runout, correct any torque deviations, and ensure no residual assembly stress remains in the entire unit.
Post-assembly closed-loop dynamic accuracy verification: Perform a full-stroke reciprocating position test under no-load power-on conditions to verify that the motor operates without low-frequency vibration or abnormal electromagnetic noise, and that the encoder's position feedback is continuous with no lost codes; Conduct a 30-minute continuous no-load test run at low speed, monitoring the motor housing temperature rise, brake release response, and bus communication stability. Only after positioning repeatability and dynamic tracking error meet the standards may the load be gradually increased to the rated load for normal production.
Product Packaging Showcase
Frequently Asked Questions (FAQ)
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Based on common faults encountered during on-site maintenance of servo systems in automated production lines, we have compiled eight Q&A entries based on actual engineering tests. We have eliminated generic, vague phrases commonly found online and tailored the content to Moons' proprietary servo selection logic: Q: How do you differentiate between Moons AC servos and low-voltage DC servos when selecting a model? A: For fixed-facility applications with high power and heavy loads using 220V industrial power, select the SM3 AC series; For AGVs, small desktop equipment, and 24–80V DC power supply scenarios, select the M2DC/MBDVmini low-voltage servo; the power supply architectures of these two series are not interchangeable.
Q: For equipment with frequent starts and stops and high-speed reciprocating motion, which type of rotor inertia motor should be prioritized? A: For short-cycle, high-speed reciprocating motion, choose a low-inertia model for faster dynamic response; For heavy loads, low-frequency heavy-duty operations, and vertical lifting applications, select medium- or high-inertia rotors to suppress vibrations caused by load impacts.
Q: What are the advantages of battery-free multi-turn absolute encoders compared to incremental encoders? A: They permanently retain mechanical coordinates after an unexpected power loss, eliminating the need to return to the origin upon restart and saving on origin sensor hardware costs, making them suitable for 24-hour uninterrupted automated production lines; In contrast, incremental encoders lose their position when power is lost and must perform a home-positioning operation every time the system is powered on.
Q: In which scenarios is the MDX + integrated servo a better fit compared to a split-type servo? A: Integrated servos are the preferred choice for equipment with limited space in the electrical control cabinet, simplified overall wiring requirements, and small-scale filling or turnstile equipment; however, for high-power 7.5 kW heavy-duty gantry systems and large-scale machining equipment, the SM3 split-type AC servo is still the recommended option.
Q: The motor vibrates at low speeds and exhibits significant positioning errors. Is this due to incorrect motor selection? A: First, verify the load-to-inertia matching ratio; an inertia ratio exceeding 10:1 will exacerbate low-speed vibration. Second, perform the drive's automatic vibration suppression tuning and correct the coupler's concentricity. There is no need to immediately replace the motor with a higher-power model.
Q: How can the motor's service life be extended in humid environments or under cutting fluid spray conditions? A: Upgrade the standard IP65 models with fluororubber composite sealed end caps, select a custom IP67-rated version, install an external dust seal on the shaft extension, and regularly clean cutting debris accumulated at the shaft seal.
Q: Is it mandatory to equip vertical lifting equipment with an electromagnetic brake? A: For vertical shaft systems where the rated load is ≥30% of the motor's rated torque, the original manufacturer's electromagnetic brake assembly must be installed to prevent gravity-induced slippage in the event of a power outage. The use of third-party brake components is strictly prohibited to avoid shaft wear caused by mismatched braking clearances.
Q: Are Moons servos compatible with mainstream third-party motion controllers? A: The entire product line natively supports standard bus protocols such as EtherCAT, CANopen, and Modbus RTU, and can interface with mainstream domestic and imported controllers. For non-standard proprietary bus protocols, Moons original factory drivers must be used to ensure stable closed-loop feedback timing. |
References
Moons General Specifications for the Design and Installation of Permanent Magnet Synchronous Servo Motors. Mingzhi Official Technical Documentation Platform
Manual for Load Inertia and Torque Selection Verification in Automated Servo Systems. Chinese Society of Mechanical Engineering
Guide to Operating Conditions, Adaptation, and Maintenance of Battery-Free Multi-Turn Absolute Encoders. CNC Technology Network
Key Points on the Application of Insulation and Sealing Materials for Servo Motor Housings. Industrial Control Network
Technical Documentation on Servo Accuracy Testing and Failure Analysis for the SM3/M2DC/MDX+ Series. Misumi Industrial Transmission Database
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