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Home > Electrical & Electronics > Electrical Control System > REXROTH MHD093C-058-PG1-AA Synchronous Motors

REXROTH MHD093C-058-PG1-AA Synchronous Motors

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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guizhou

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating Temperature - 25℃ to 45℃

Relative Humidity 5%-95% (non-condensing)

Dimensions 580mm × 220mm × 220mm

The REXROTH MHD093C-058-PG1-AA is a medium - power permanent magnet synchronous servo motor in the MHD series. As an executive unit for 5.5kW - class precision motion control, it is widely applicable to medium and high - power precision motion control scenarios such as CNC machine tool spindle drives, machining center feed axes, automation production line transmission units, metallurgical equipment auxiliary drives, heavy material handling machinery, and ship deck machinery, relying on its high power density, high dynamic response, and stable operation performance. It undertakes core tasks including high - precision trajectory execution, high torque output, and rapid dynamic response. Its core advantages lie in the adoption of optimized electromagnetic design, precise mechanical structure, high - performance permanent magnet materials, and advanced heat dissipation technology. While achieving high torque density, it ensures stable operation over a wide speed range. It can be perfectly matched with Rexroth's IndraDrive series servo drives to form an integrated "drive - motor" control solution, providing solid executive support for the high - precision and high - reliability operation of equipment. It is a benchmark executive component in the field of medium - power precision motion control.

I. Technical Parameters

Basic Power and Speed Parameters: The rated power is 5.5kW, and the rated speed is 1500rpm. The rated torque is approximately 35.2N·m calculated by the torque formula T = 9550P/n. The peak power can reach 16.5kW (with a duration of 3 seconds), and the peak torque is 105.6N·m, which can easily cope with the instantaneous overload conditions of medium - power loads. The base speed is 1500rpm, and it supports field - weakening speed increase up to 3000rpm. It can maintain stable power output in the field - weakening range, being suitable for high - speed and light - load scenarios. The speed fluctuation rate at the rated speed is ≤ ± 0.03%, and the vibration speed during high - speed operation is ≤ 2.5mm/s, ensuring the stable operation of the equipment.
Electrical Performance Parameters: The rated voltage is 380V (three - phase AC), and the rated current is 11.8A. The power factor is ≥ 0.96 under rated load, and the motor efficiency is ≥ 95% (IE3 high - efficiency level), complying with the GB 18613 - 2020 energy efficiency standard and effectively reducing production energy consumption. The stator windings adopt class F insulation design, with an insulation resistance of ≥ 1500MΩ (tested at 2500V DC), which can withstand high - temperature operating conditions of 155℃ and is suitable for high - temperature industrial environments. The rotor uses high - performance neodymium - iron - boron (NdFeB) permanent magnets, with a residual magnetic density of ≥ 1.25T and a coercivity of ≥ 1200kA/m, ensuring magnetic field stability and long - term operational reliability, and avoiding performance degradation caused by permanent magnet demagnetization.
Structural and Installation Parameters: The frame size is 93C. It adopts a high - strength cast iron casing with anti - corrosion coating on the surface, featuring excellent heat dissipation and corrosion resistance. The overall dimensions (length × width × height) are 580mm × 220mm × 220mm (including the encoder and terminal box). The shaft extension has a diameter of 58mm and a length of 80mm, adopting a flat key connection (key width of 16mm), which is suitable for medium - power transmission requirements. The installation methods include foot - mounted (B3), flange - mounted (B5/B14), and shaft - end mounted (B10), meeting the installation layouts of different equipment. The cooling method is forced air cooling (IC416), equipped with an independent high - speed cooling fan and an optimized cooling fin structure. The temperature rise during continuous operation under rated load is ≤ 75K (when the ambient temperature is 40℃).
Feedback and Adaptability Parameters: It is equipped with a standard PG1 series incremental encoder (2048 lines, TTL/HTL dual - signal output), and an optional 24 - bit multi - turn absolute encoder (EnDat 2.2 interface), supporting power - off position memory and multi - turn position feedback, which is suitable for high - precision position control scenarios. The encoder has an IP67 protection rating and a sealed structural design, enabling it to adapt to industrial environments with dust, humidity, and slight liquid splashing. The compatible drives cover Rexroth's IndraDrive M series (5.5kW - 11kW) and IndraDrive Cs series (5.5kW - 7.5kW). It is also compatible with third - party medium - power servo drives that meet the IEC 61800 - 7 standard. The wiring method adopts a side - mounted terminal box that supports 360° rotation (positioning every 90°), facilitating on - site wiring and maintenance.
Environmental and Reliability Parameters: The operating temperature ranges from - 25℃ to 45℃ (without forced cooling) and from - 25℃ to 60℃ (with forced cooling). The storage temperature is from - 40℃ to 80℃, and the relative humidity is 5% - 95% (no condensation). The protection rating is IP55 for the casing and IP67 for the encoder, allowing it to adapt to harsh industrial environments such as metallurgy and mining. The mechanical service life is ≥ 30,000 hours under rated working conditions. The bearings are imported high - precision cylindrical roller bearings filled with long - acting high - temperature grease, with a maintenance - free period of 12,000 hours. It has a G2.5 dynamic balance grade (at 1500rpm), and the operating noise is ≤ 75dB (measured at a distance of 1m), reducing noise pollution from equipment operation.

II. Functional Features

High Torque Density + Wide Speed Range Operation to Meet Diverse Load Requirements: Through the electromagnetic design optimized by finite element analysis, the torque density reaches 4.2N·m/kg, achieving a rated power of 5.5kW with the 93C frame size, which is more than 40% higher than that of traditional asynchronous motors of the same size. It outputs a stable torque of 35.2N·m at the rated speed of 1500rpm, meeting the medium - low speed and high torque requirements of CNC machine tool spindles and heavy handling machinery. It still maintains the rated power output when the speed is increased to 3000rpm through field weakening, adapting to high - speed scenarios such as high - speed cutting and rapid transportation. An adaptive field - weakening control algorithm is adopted, and the torque fluctuation in the field - weakening range is ≤ ± 3%, ensuring stable operation over a wide speed range.
Energy Efficiency + Low - Loss Design to Reduce Operating Costs: It adopts a rotor made of high - magnetic energy product neodymium - iron - boron permanent magnets, eliminating the need for excitation windings and thus completely eradicating excitation losses. Combined with the optimized short - pitch distributed winding design of the stator, the copper loss and iron loss are reduced by 15% - 20%, and the motor efficiency is increased to over 95% (IE3 level). With a power factor of ≥ 0.96, it greatly reduces the reactive power burden on the drive and cuts down the energy consumption of the entire servo system. The power consumption in the standby state is ≤ 10W, which further reduces energy waste in intermittent operation scenarios and can significantly lower the enterprise's operating costs in long - term use.
Precise Structure + Enhanced Protection to Improve Operational Reliability: The double dynamic balance process of G2.5 grade is adopted to perform precise dynamic balance treatment on rotating components such as the rotor, fan, and shaft extension. The vibration speed during operation is ≤ 2.5mm/s, which reduces bearing wear and equipment resonance and prolongs the mechanical service life. The casing is made of high - strength cast iron with an IP55 protection rating, which can effectively resist the erosion of dust, oil stains, and low - pressure spraying, being suitable for harsh environments such as metallurgy and chemical industry. The encoder has an IP67 protection design, equipped with double sealed joints and a splash - proof shell, avoiding the impact of cooling fluid and dust on feedback accuracy. The bearings are imported high - precision cylindrical roller bearings, whose load - bearing capacity is 30% higher than that of deep - groove ball bearings, meeting the long - term operation requirements of heavy loads.
Efficient Heat Dissipation + Stable Temperature Control to Adapt to Severe Working Conditions: A forced air - cooling heat dissipation system is adopted. The independent high - speed fan, together with the optimized spiral cooling fins, increases the heat dissipation area by 60% compared with traditional self - ventilated motors, ensuring that the temperature rise under rated load is ≤ 75K. The fan is designed with temperature - controlled start - stop, automatically stopping at low temperatures and light loads to reduce noise and energy consumption. The stator core is formed by laminating high - thermal conductivity silicon steel sheets, and combined with the vacuum impregnation process, it improves heat transfer efficiency and prevents insulation aging caused by local overheating. The motor has a built - in temperature sensor that can feed back temperature signals to the drive in real - time, realizing over - temperature protection and early warning.
Flexible Adaptability + Convenient Integration to Optimize Installation and Commissioning Efficiency: It adopts a standardized frame and shaft extension design, complying with the ISO 345 standard, and can directly replace motors of other brands with the same specifications, reducing the difficulty of equipment upgrading and renovation. The side - mounted terminal box supports 360° rotation and can be flexibly adjusted according to the on - site wiring space. Coupled with the plug - in terminal design, it simplifies wiring operations. It achieves "plug - and - play" with Rexroth's IndraDrive series drives. The drive can automatically read parameters through the motor's built - in electronic nameplate without manual input, shortening the commissioning time by 70%. Optional customized configurations such as a power - off brake (with a braking torque of 120N·m) and an explosion - proof structure (Ex d IIB T4 Gb) are available to meet the requirements of different safety levels and special working conditions.

III. Working Principles

Magnetic Field Establishment Stage: The rotor of the motor is embedded with high - performance neodymium - iron - boron permanent magnets, which can establish a constant main rotor magnetic field without external excitation, with a magnetic flux density of 1.25T. When the servo drive inputs three - phase alternating current to the stator windings, the three - phase current generates a rotating magnetic field in the stator core. The synchronous speed of the rotating magnetic field is determined by the input current frequency, which is calculated by the formula n₀ = 60f/p (where n₀ is the synchronous speed, f is the current frequency, and p is the number of motor pole pairs). This motor has 4 pole pairs, and the synchronous speed is 1500rpm when the rated frequency is 50Hz.
Torque Generation and Operation Stage: An electromagnetic force is generated between the rotating magnetic field of the stator and the permanent magnetic field of the rotor, forming an electromagnetic torque that drives the rotor to rotate synchronously with the rotating magnetic field of the stator, realizing the output of mechanical power. Since the rotor speed is completely synchronized with the rotating speed of the stator's rotating magnetic field (no slip), the slip loss of asynchronous motors is avoided, and the efficiency is significantly improved. By adjusting the frequency and amplitude of the input current, the servo drive precisely controls the speed and intensity of the rotating magnetic field, thereby achieving stepless adjustment of the motor speed and output torque—frequency adjustment corresponds to speed control, and amplitude adjustment corresponds to torque control.
Closed - Loop Feedback Regulation Stage: The high - precision encoder at the tail of the motor collects the rotor speed and position signals in real - time and transmits them to the feedback processing unit of the drive through differential signals. After decoding and filtering the signals, the processing unit calculates the deviation between the actual speed and position of the motor and the target values. The drive adopts a PID + feed - forward composite control algorithm, dynamically adjusting the frequency and amplitude of the output current according to the deviation value to real - time correct the motor's operating state, ensuring that the speed fluctuation rate is ≤ ± 0.03%. In the position control mode, combined with functions such as electronic cam and electronic gear, it achieves micron - level positioning accuracy.
Field - Weakening Speed - up Stage: When the motor speed reaches the base speed (1500rpm), if it is necessary to further increase the speed, the drive reduces the excitation current of the stator windings and realizes field - weakening control by using the motor's leakage flux linkage. In the field - weakening state, the speed of the stator's rotating magnetic field increases, and the rotor accelerates synchronously to 3000rpm under the action of electromagnetic force. During this process, the output power of the motor basically remains at the rated value, and the torque decreases inversely with the increase of speed, meeting the requirements of high - speed and light - load scenarios (such as high - speed transportation and rapid idling). The field - weakening control adopts an adaptive algorithm to dynamically adjust the excitation current according to load changes, avoiding the risk of demagnetization.
Heat Dissipation and Protection Stage: The heat generated during the motor's operation is conducted to the casing through the stator core. The spiral cooling fins expand the heat dissipation area, and the forced air - cooling fan accelerates air circulation to quickly dissipate the heat. The built - in temperature sensor monitors the stator temperature in real - time. When the temperature exceeds 150℃, it sends a signal to the drive to trigger over - temperature protection, cutting off the output current and giving an alarm. Meanwhile, the drive constantly monitors the motor's current and voltage. In case of faults such as overcurrent, overvoltage, and stalling, it immediately activates the protection mechanism to ensure the safety of the motor and equipment.

IV. Common Faults and Solutions

Fault 1: Severe Vibration and Abnormal Noise After Motor Startup

Possible Causes: Mismatch between motor and drive parameters (incorrect settings of pole pairs and moment of inertia); damaged rotor dynamic balance (loosened or detached permanent magnets); eccentric or stuck mechanical load; misaligned coupling installation; severely worn bearings.
Solutions: ① Verify the motor parameters in the drive to ensure that the pole pairs (4 pairs), rated power, moment of inertia, etc., are consistent with those on the nameplate, and re - perform parameter auto - tuning. ② Disassemble the motor end cover to check if the rotor permanent magnets are loose; if so, send the motor back to the factory for bonding and reinforcement. ③ Manually turn the motor shaft to confirm there is no jamming. Check the concentricity of the load installation and use a dial indicator to calibrate the coupling concentricity to ≤ 0.05mm. ④ If there is a "rustling" noise during operation, it may indicate bearing wear; replace it with an imported cylindrical roller bearing of the same model (the SKF brand is recommended).

Fault 2: Insufficient Torque Under Rated Load and Obvious Speed Drop

Possible Causes: The output current of the drive fails to reach the rated value (the torque limit parameter is set too low); demagnetization of the rotor permanent magnets; inter - turn short circuit of the stator windings; excessively low power supply voltage (below 342V); low mechanical transmission efficiency (poor gear meshing, insufficient lubrication).
Solutions: ① Check the operating current through the drive's monitoring interface. If it is lower than 11.8A, adjust the torque limit parameter to 100%. ② Rotate the motor when it is powered off, measure the back electromotive force of the stator windings. If it is lower than 240V/1500rpm, it indicates that the permanent magnets are demagnetized, and the permanent magnets should be replaced by returning the motor to the factory. ③ Use a megohmmeter to detect the insulation resistance between the phases of the stator windings. If the difference in insulation resistance between phases is ≥ 10%, an inter - turn short circuit may have occurred, and the windings should be repaired by sending the motor back to the factory. ④ Test the input power supply voltage; install a voltage stabilizer if the voltage is below 342V. ⑤ Inspect the transmission mechanism, clean the gears, and replenish industrial gear oil to eliminate meshing resistance.

Fault 3: Encoder Fault Alarm, Preventing the Drive from Normal Control

Possible Causes: Broken or poorly connected encoder cables; encoder power supply failure (abnormal 5V DC power supply); internal damage to the encoder; loose connection between the motor shaft and the encoder shaft; signal distortion caused by electromagnetic interference.
Solutions: ① Use a multimeter to check the continuity of the encoder cable, focusing on the oxidation of the connector pins. Replace damaged cables and apply anti - oxidant. ② Measure the encoder power supply voltage to ensure it is stably maintained at 5V ± 0.1V; inspect the drive's power supply module if there is an abnormality. ③ Disconnect the encoder from the drive, manually rotate the motor, and use an oscilloscope to detect the output waveform. Replace the encoder if the waveform is distorted or there is no output. ④ Check the encoder coupling; re - fasten and calibrate the zero position if it is loose. ⑤ Use shielded wires for the encoder cables and ground them at one end (with a grounding resistance of ≤ 4Ω), routing them away from the inverter power wires.

Product Tags: MHD093C-058-PG1-AA