In today's fast-growing automation industry, servo motor and drive systems serve as the core power unit for motion control equipment, ranging from small electronic assembly platforms to medium-sized CNC machining centers, packaging forming machinery and material handling systems. Original equipment manufacturers (OEMs), automation engineers and procurement teams frequently face a critical selection dilemma: choosing between a 750W servo system and a 2kW servo system for their machine designs. Many buyers simply judge servo performance by nominal power figures, mistakenly assuming that power rating is the only decisive factor. This oversimplified judgment often leads to two common engineering failures: over-specification that brings unnecessary capital waste, or under-sized servo systems that suffer from continuous overheating, position jitter, frequent alarm shutdowns and shortened service life.
The gap between a 750W servo solution and a 2kW servo solution is not a linear 2.67 times difference in performance. The actual working capability depends on rated torque, peak torque output, load inertia matching, continuous load capacity and the current output capability of the servo drive. To help automation practitioners make data-driven decisions, this article carries out a comprehensive comparison focusing on load capacity, torque performance and total cost of ownership. The two products for our case study are the 2kw AC Servo Motor Drive Controller and the 750W 220V Servo Motor Drive developed and manufactured by Zhejiang Tonghang E-Drive Technology Co., Ltd. We will break down hardware specifications, real working limits, applicable scenarios and hidden costs of these two servo kits. By the end of this article, readers can get a clear checklist to identify which servo system fits their machine requirements, instead of blindly picking higher power or cheaper options.
Core Terminology: What Decides Servo System Performance
Before diving into the side-by-side comparison of the 2kw AC Servo Motor Drive and the 750W 220V Servo Motor Drive, it is necessary to clarify several fundamental servo parameters that directly determine system performance. Many non-specialist buyers ignore these concepts and only compare power values, which is the root cause of improper servo selection.
First, rated torque refers to the continuous torque that the servo motor can stably output under long-time operation without exceeding the allowable temperature rise. This parameter defines the maximum continuous load the whole servo system can bear. Peak torque is the short-term burst torque that the servo can release within a limited time window, usually used for machine acceleration, deceleration and overcoming instantaneous impact resistance. Peak torque cannot be maintained continuously. If the servo keeps running at peak torque for a long time, overcurrent protection will trigger and the motor winding will be damaged.
Second, load inertia matching is another critical indicator. Servo drives can only achieve high-precision positioning and stable motion when the inertia of the mechanical load matches the motor rotor inertia. A mismatch in inertia will result in vibration, slow response and poor repeated positioning accuracy, even if the power of the servo is large enough. The maximum allowable inertia ratio is not determined by the motor alone; the drive's control algorithm and current loop response also play decisive roles. The 750W Servo Motor Drive has its own limit for load inertia ratio, while the 2kw AC Servo Motor Drive Controller supports a wider inertia matching range for heavier mechanical structures.
Third, load capacity is a comprehensive index integrating torque, inertia, duty cycle and drive current output. It is wrong to equate power directly with load capacity. A high-power servo with a poorly matched mechanical structure may perform worse than a properly tuned low-power servo in light-load high-speed applications. With these definitions established, we can analyze the hardware characteristics of the two servo kits.
Hardware Overview: 2kw AC Servo Motor Drive Controller & 750W 220V Servo Motor Drive
Zhejiang Tonghang E-Drive Technology Co., Ltd specializes in R&D and mass production of AC servo motors and servo drive controllers for industrial automation. The company supplies servo products for domestic and overseas OEM customers, covering light to medium load motion control requirements. Both the 2kw AC Servo Motor Drive and the 750W Servo Motor Drive adopt 220V AC power input, which is convenient for most factory workshops without three-phase high-voltage power supply. However, their hardware design, power circuit and compatible motor specifications are quite different.
The 750W Servo Motor Drive is designed for compact equipment. It is matched with an 80-flange 750W AC servo motor. The drive supports multiple control modes including pulse/direction control, analog speed/torque control and RS485 communication. Selected models are compatible with EtherCAT fieldbus for high-speed synchronous motion. The circuit board and heat sink of the 750W Servo Motor Drive are miniaturized, so the overall cabinet space occupation is small. Built-in protection functions include over-current protection, over-temperature protection, encoder fault detection, over-voltage and under-voltage protection. This servo kit is optimized for light inertia, high-speed point-to-point motion, and the overload capacity is designed for occasional short acceleration shocks.
On the other hand, the 2kw AC Servo Motor Drive pairs with a 130-flange 2kW AC servo motor. Its internal power semiconductor components are upgraded to support higher continuous and peak output current. The heat dissipation structure is reinforced with a larger aluminum heat sink to dissipate heat during long-time heavy-load operation. The 2kw AC Servo Motor Drive retains the same control interface system as the 750W drive. Engineers can use the same debugging software to set parameters, which greatly reduces learning and configuration costs for users who adopt multiple servo models in one machine. Nevertheless, the power loop of the 2kw AC Servo Motor Drive cannot be interchanged with the 750W Servo Motor Drive. Users cannot connect a 2kW servo motor to the 750W drive, nor can they use the 2kW controller to drive a 750W motor in formal production, because the current protection threshold and parameter preset are not compatible.
Torque Performance Comparison (Rated & Peak Torque)
Torque is the core metric separating the performance boundary between the 2kw AC Servo Motor Drive system and the 750W Servo Motor Drive system. Power is mathematically calculated by torque multiplied by rotating speed. When the rotation speed stays at the same level, the servo system with higher power will deliver much higher torque output.
The 750W Servo Motor Drive paired with its standard motor provides approximately 2.4 N·m rated torque and around 7.0 N·m peak torque. The peak torque can only be sustained for dozens of milliseconds for acceleration. If the machine repeatedly triggers peak torque in every working cycle, the servo drive will accumulate heat and activate thermal protection. This torque profile fits light-load movement: the servo can quickly accelerate small jigs, but it cannot resist continuous cutting force or heavy friction load.
In contrast, the servo system matched with the 2kw AC Servo Motor Drive delivers roughly 9.5 N·m rated torque and 22 N·m to 24 N·m peak torque. The continuous rated torque of the 2kW servo is nearly four times that of the 750W model. The higher rated torque means the system can maintain stable operation under sustained heavy load, such as continuous extrusion and metal cutting processes. The peak torque reserve also offers stronger capability to overcome sudden resistance during machine startup. The 2kw AC Servo Motor Drive can output a larger instantaneous current to excite the motor winding, which is the hardware foundation for such high burst torque.
Engineers must distinguish application types when comparing torque. For intermittent positioning movement with low continuous force, the peak torque value is the main reference. For machining, forming and continuous conveying applications, rated torque is the decisive parameter, and peak torque only serves as a short safety margin. Many selection mistakes occur when engineers only look at peak torque and ignore rated torque limits of the 750W Servo Motor Drive.
Load-Capacity Analysis: Inertia, Continuous & Intermittent Working Load
Load capacity is a comprehensive performance dimension that combines torque output, inertia matching and working cycle duty. The difference between the 2kw AC Servo Motor Drive and the 750W Servo Motor Drive becomes more obvious when we analyze mechanical load conditions.
Continuous working load represents the steady load applied to the servo during most of the machine running time. If the continuous torque requirement of the mechanical structure exceeds the rated torque of the servo system, long-time operation will trigger thermal accumulation and degrade the whole drive system. The 750W Servo Motor Drive can handle light continuous loads smoothly, yet it cannot sustain heavy continuous load for hours. Operators who force the 750W system to run near full load for long periods will face frequent thermal alarms and accelerated aging of power devices.
Intermittent working load refers to cyclic shock loads that only appear in a short window of each work cycle. Both servo systems support short-time peak overload, but their overload tolerance cycles differ greatly. The 750W Servo Motor Drive can cope with occasional impact load, while repeated high-cycle shock will push the drive beyond its thermal design limit. The 2kw AC Servo Motor Drive, by contrast, is engineered for frequent shock load scenarios. Its reinforced power circuit and heat dissipation design can handle cyclic peak torque without obvious temperature rise.
Load inertia matching is another key part of load capacity evaluation. For equipment with large rotary jigs, turntables or heavy moving frames, the inertia ratio must be checked carefully. The 2kw AC Servo Motor Drive allows a wider range of load-to-motor inertia ratio, making it suitable for large inertia mechanical structures. The 750W Servo Motor Drive works best with small inertia loads such as miniature sliding tables and lightweight material pushers. It is worth noting that good inertia matching cannot be replaced by simply increasing servo power. Even a high-power servo will vibrate and lose positioning precision if the inertia mismatch is severe.
Real-world Application Scenario Matching
Different servo systems shine in different industrial scenarios. Ranked in no particular order, we list typical application cases for the two servo kits for engineers' reference.
For the 750W Servo Motor Drive, common applications include small CNC engraving machines, compact packaging equipment, electronic component sorting platforms and light-duty conveyor lines. These machines share similar features: low continuous torque demand, small moving mass and high-speed point-to-point positioning requirements. In these scenarios, the 750W servo can fully meet motion requirements while saving cabinet installation space and controlling hardware budget. It has become a mainstream motion solution for small automation equipment manufacturers.
As for the 2kw AC Servo Motor Drive , it is widely deployed in medium-sized CNC processing equipment, heavy-duty packaging forming machines, medium-load transfer mechanisms and some robotic joint assemblies. These applications require stable high continuous torque output to overcome large friction resistance and heavy workpiece inertia. In forming and cutting processes, the servo needs to maintain steady speed under variable load. The 2kw AC Servo Motor Drive delivers stable torque output under variable load conditions, avoiding speed fluctuation that may cause defective products.
There are also boundary scenarios where both servo systems can be candidates after detailed load calculation. For example, a medium-size material feeding mechanism with low duty cycle impact load may be able to adopt either system after mechanical optimization. In such cases, engineers need to balance space constraint, cost target and long-term reliability rather than directly pick one model.
Full-dimension Cost Comparison (Hardware, Operation, Maintenance, Hidden Cost)
Cost evaluation of servo systems should not only focus on the upfront hardware purchase price. A complete cost assessment covers hardware investment, installation cost, energy consumption, maintenance expense and hidden downtime losses. Ranked in no particular order, we analyze the cost differences between the 2kw AC Servo Motor Drive and the 750W Servo Motor Drive.
First, hardware procurement cost. The complete kit of the 2kw AC Servo Motor Drive together with its matched motor has a higher purchase price than the 750W Servo Motor Drive kit. The 750W servo adopts smaller power components and compact heat sink, so the material cost is lower. For mass equipment production, the unit price gap will accumulate into a remarkable total cost difference.
Second, installation and space cost. The 750W Servo Motor Drive features compact dimensions. It occupies less cabinet space and brings lower cabinet manufacturing cost. The 2kw AC Servo Motor Drive Controller and its matched motor have larger overall sizes. Machine designers need to reserve enough space inside the control cabinet, which may increase the overall machine dimension and structural cost for space-limited devices.
Third, operating energy consumption. When properly matched to the load, both servo systems maintain high energy efficiency. If users select over-sized servo, such as deploying the 2kw AC Servo Motor Drive for a tiny constant load, the idle power loss will lead to slightly higher long-term power consumption. On the contrary, under-sized servo that runs continuously near its torque limit will consume extra energy and generate excessive heat.
Fourth, maintenance and hidden failure cost. Both servo series share the same debugging software and basic protection logic, so the training cost for maintenance technicians is similar. The major hidden cost comes from improper selection. If users adopt the 750W Servo Motor Drive for heavy-duty continuous applications, frequent shutdown alarms and component burnout will bring production line downtime and maintenance replacement cost. In many manufacturing cases, the loss caused by unexpected production halt far exceeds the hardware price difference between the two servo kits.
Key Selection Checklist: When Should You Pick Which System
Engineers can follow this practical checklist to select between the 2kw AC Servo Motor Drive and the 750W Servo Motor Drive.
Calculate the continuous working torque requirement of the mechanical structure
Confirm peak acceleration torque and the cycle frequency of impact load
Compute load inertia and verify the allowable inertia range of the servo drive
Evaluate the available installation space inside the control cabinet
Work out hardware budget and assess potential downtime risk caused by servo overload
Confirm the factory power supply condition
General selection guidelines are as follows. The 750W Servo Motor Drive is recommended for light-load, small-inertia and intermittent point motion applications where continuous torque stays below 2 N·m. The 2kw AC Servo Motor Drive is a better choice for applications requiring continuous torque above 5 N·m, high-cycle impact load or large inertia workpieces.
Inquiry & Technical Cooperation
For CNC equipment manufacturers and industrial automation integrators, selecting a reliable servo drive partner is essential for achieving stable motion control and machine performance.
Tonghang E-Drive Technology Co., Ltd. provides:
• 2kW servo drive solutions
• 750W 220V servo drive solutions
• Motion control integration support
• Product selection guidance
• Engineering tuning assistance
Cooperation Process:
• Application requirement analysis
• Product configuration recommendation
• Sample testing and validation
• Mass production support
Whether for standard automation equipment or customized motion control projects, TH provides professional technical support to help customers achieve efficient and reliable system integration.