絲杠動態扭矩是指絲杠在旋轉運行過程中所承受的扭轉力矩，其大小直接反映絲杠傳動系統的運行狀態與負載變化，是評估機械傳動效率、判斷設備故障的重要參數。合理測量絲杠動態扭矩，有助于優化傳動設計、減少能量損耗，避免因扭矩異常導致的絲杠磨損、卡頓甚至斷裂，在機床、精密儀器、自動化生產線等領域應用廣泛。

　　The dynamic torque of a screw refers to the torsional torque that the screw experiences during its rotational operation. Its magnitude directly reflects the operating state and load changes of the screw transmission system, and is an important parameter for evaluating mechanical transmission efficiency and determining equipment failures. Accurately measuring the dynamic torque of the screw helps optimize transmission design, reduce energy loss, and avoid screw wear, jamming, and even breakage caused by abnormal torque. It is widely used in fields such as machine tools, precision instruments, and automated production lines.

　　動態扭矩測量的核心原理是通過傳感元件捕捉絲杠旋轉時的扭矩變化，并將力學信號轉化為可量化的電信號。當絲杠受到扭矩作用時，其軸體會產生微小的扭轉變形（符合胡克定律，在彈性范圍內變形量與扭矩成正比），測量這種微小變形即可間接計算扭矩值。常見的傳感方式有應變片式、磁電式與光學式 —— 應變片式通過粘貼在絲杠軸體上的應變片感知變形，變形會導致應變片電阻變化，經惠斯通電橋轉換為電壓信號，具有測量精度高（誤差可控制在 ±0.5% 以內）、響應速度快的特點，適合高頻動態扭矩測量；磁電式利用磁彈性效應，絲杠軸體在扭矩作用下磁導率發生變化，通過線圈感應磁場變化獲取扭矩信號，抗干擾能力強，適合油污、粉塵較多的工業環境；光學式則通過激光干涉測量軸體兩端的相對轉角，計算扭矩值，測量范圍大且無接觸，適合高精度、高轉速場景（如精密絲杠傳動）。

　　The core principle of dynamic torque measurement is to capture the torque changes during the rotation of the screw through sensing elements, and convert the mechanical signal into a quantifiable electrical signal. When the screw is subjected to torque, its shaft will undergo slight torsional deformation (in accordance with Hooke's law, the amount of deformation is proportional to the torque within the elastic range), and measuring this slight deformation can indirectly calculate the torque value. The common sensing methods include strain gauges, magneto electric sensors, and optical sensors. Strain gauges sense deformation by attaching strain gauges to the screw shaft, which causes changes in the resistance of the strain gauges. The signals are converted into voltage signals by a Wheatstone bridge and have high measurement accuracy (error can be controlled within ± 0.5%) and fast response speed, making them suitable for high-frequency dynamic torque measurement; The magneto electric method utilizes the magneto elastic effect, and the magnetic permeability of the screw shaft changes under the action of torque. The torque signal is obtained through the induction of magnetic field changes by the coil. It has strong anti-interference ability and is suitable for industrial environments with high oil and dust pollution; The optical method uses laser interferometry to measure the relative rotation angle at both ends of the shaft and calculate the torque value. The measurement range is large and non-contact, suitable for high-precision and high-speed scenarios (such as precision screw drive).

　　常用的測量方法需根據絲杠的安裝環境與運行參數選擇，確保測量過程不干擾正常傳動。在線測量法是將傳感器集成到絲杠傳動系統中，實時監測運行扭矩，適用于需要持續監控的設備（如數控機床進給系統）。安裝時需在絲杠與驅動電機之間加裝扭矩傳感器（如法蘭式傳感器），傳感器兩端通過聯軸器分別連接電機輸出軸與絲杠輸入端，確保同心度（徑向跳動不超過 0.1 毫米），避免附加力矩影響測量精度。離線測量法則是將絲杠從設備中拆卸，安裝到專用測試平臺進行測量，適合設備檢修或性能測試，測試平臺可模擬不同轉速、負載條件（如通過伺服電機驅動絲杠，加載裝置施加軸向力），多維度評估絲杠在各種工況下的扭矩特性。對于無法拆卸的大型絲杠（如軋機絲桿），可采用非接觸式測量法，通過紅外測溫或振動分析間接估算扭矩（扭矩異常時絲杠溫度或振動頻率會發生變化），但精度相對較低（誤差約 ±5%），僅作為輔助判斷手段。

　　The commonly used measurement methods should be selected based on the installation environment and operating parameters of the screw to ensure that the measurement process does not interfere with normal transmission. The online measurement method integrates sensors into the screw drive system to monitor the operating torque in real time, and is suitable for equipment that requires continuous monitoring, such as the feed system of CNC machine tools. During installation, a torque sensor (such as a flange sensor) should be installed between the screw and the drive motor. The two ends of the sensor should be connected to the motor output shaft and the screw input end through couplings to ensure concentricity (radial runout not exceeding 0.1 millimeters) and avoid additional torque affecting measurement accuracy. The offline measurement method involves disassembling the lead screw from the equipment and installing it on a dedicated testing platform for measurement, which is suitable for equipment maintenance or performance testing. The testing platform can simulate different speeds and load conditions (such as driving the lead screw through a servo motor and applying axial force to the loading device), comprehensively evaluating the torque characteristics of the lead screw under various working conditions. For large screws that cannot be disassembled (such as rolling mill screws), non-contact measurement methods can be used to indirectly estimate torque through infrared temperature measurement or vibration analysis (the temperature or vibration frequency of the screw will change when the torque is abnormal), but the accuracy is relatively low (with an error of about ± 5%), and it is only used as an auxiliary judgment method.

　　測量過程中的參數控制與環境適應是保證數據可靠的關鍵。轉速匹配方面，傳感器需滿足絲杠的非常高轉速要求（如普通滾珠絲杠轉速通常在 1000-3000 轉 / 分鐘，高速絲杠可達 5000 轉 / 分鐘以上），避免因轉速過高導致傳感器損壞或信號失真。負載模擬需貼合實際工況，測量時施加的軸向負載應與絲杠實際工作負載一致（如機床絲杠需模擬切削力產生的軸向力），負載不穩定會導致扭矩測量值波動，需通過穩壓裝置或伺服控制系統保持負載平穩。環境因素方面，溫度變化會影響應變片、傳感器電路的穩定性，測量時需將環境溫度控制在 20-30℃（溫差不超過 ±5℃），或通過溫度補償電路消除誤差；電磁干擾（如附近有變頻電機、電焊機）會干擾電信號傳輸，需對傳感器線纜進行屏蔽處理（如采用屏蔽電纜、接地良好），并遠離強電磁源。

　　Parameter control and environmental adaptation during the measurement process are key to ensuring data reliability. In terms of speed matching, the sensor needs to meet the maximum speed requirements of the screw (such as ordinary ball screws usually have a speed of 1000-3000 revolutions per minute, and high-speed screws can reach more than 5000 revolutions per minute), to avoid sensor damage or signal distortion caused by high speed. Load simulation should be in line with actual working conditions, and the axial load applied during measurement should be consistent with the actual working load of the screw (such as simulating the axial force generated by cutting force on machine tool screws). Unstable load can cause fluctuations in torque measurement values, and stable load should be maintained through a voltage regulator or servo control system. In terms of environmental factors, temperature changes can affect the stability of strain gauges and sensor circuits. During measurement, the ambient temperature should be controlled at 20-30 ℃ (temperature difference not exceeding ± 5 ℃), or errors should be eliminated through temperature compensation circuits; Electromagnetic interference (such as nearby variable frequency motors and welding machines) can interfere with the transmission of electrical signals. Therefore, it is necessary to shield the sensor cables (such as using shielded cables and good grounding) and keep them away from strong electromagnetic sources.

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