如何為您的工業(yè)自動化應(yīng)用找到理想的傳感器

Analog and digital sensors deliver long-term stability,precision and reliability.

模擬和數(shù)字傳感器具有長期的穩(wěn)定性，精度和可靠性。

　　Motion control and industrial automation systems create numerous challenges for design engineers.For example,they must contend with the excessive dirt and dust found in factory settings.In addition,conveyors and pick-and-place systems can exhibit high vibration or spikes in shock force that threaten the stability of the circuit’s sensors.The magnetic sensing system selected must provide exceptional durability to ensure the long-term accuracy and reliability within the application.

　　運動控制和工業(yè)自動化系統(tǒng)為設(shè)計工程師帶來了眾多挑戰(zhàn)。例如，他們必須與工廠設(shè)置中發(fā)現(xiàn)的過多污垢和灰塵作斗爭。此外，傳送帶和取放系統(tǒng)可能會出現(xiàn)高振動或沖擊力峰值，從而威脅到電路傳感器的穩(wěn)定性。所選的磁傳感系統(tǒng)必須具有出色的耐用性，以確保應(yīng)用范圍內(nèi)的長期準(zhǔn)確性和可靠性。

　　During project planning,the design engineer should conduct a thorough review of the industrial application’s environmental,mechanical,electrical and magnetic parameters.The engineer should analyze the industrial application’s full magnetic circuit—including the sensor and the magnetic actuator.With all key factors in mind,the engineer may recommend a robust custom sensor to meet the industrial automation system’s unique requirements.

　　在項目規(guī)劃期間，設(shè)計工程師應(yīng)對工業(yè)應(yīng)用的環(huán)境，機械，電氣和磁參數(shù)進行徹底的審查。工程師應(yīng)分析工業(yè)應(yīng)用的全磁路-包括傳感器和磁致動器?？紤]到所有關(guān)鍵因素，工程師可能會建議使用功能強大的定制傳感器，以滿足工業(yè)自動化系統(tǒng)的獨特要求。

　　This article will discuss how to choose highly accurate and reliable sensors for industrial automation applications.After defining and describing the benefits of several analog and digital sensors,it will provide examples of industrial applications that utilize these devices.

　　本文將討論如何為工業(yè)自動化應(yīng)用選擇高度準(zhǔn)確和可靠的傳感器。在定義和描述了幾種模擬和數(shù)字傳感器的優(yōu)點之后，它將提供利用這些器件的工業(yè)應(yīng)用的示例。

Analog Rotary and Linear Hall Effect Sensors Provide Stability and Precision

模擬旋轉(zhuǎn)和線性霍爾效應(yīng)傳感器提供穩(wěn)定性和精度

　　Analog sensors allow the end user to get instantaneous feedback on the magnet’s position in an industrial automation system.In the past,analog Hall effect sensors measured the flux density of the magnets and were greatly influenced by the temperature value of the application.Recent advancements in analog Hall effect technology allow the Hall effect chip to measure the angle of the flux field instead of the traditional amplitude,making it much less sensitive to temperature changes.Hall effect sensors now deliver a very stable analog output across a large temperature range.

　　模擬傳感器允許最終用戶獲得有關(guān)工業(yè)自動化系統(tǒng)中磁體位置的即時反饋。過去，模擬霍爾效應(yīng)傳感器測量磁體的磁通密度，并且受應(yīng)用溫度值的影響很大。模擬霍爾效應(yīng)技術(shù)的最新進展使霍爾效應(yīng)芯片能夠測量通量場的角度，而不是傳統(tǒng)的幅度，從而使其對溫度變化的敏感性大大降低?，F(xiàn)在，霍爾效應(yīng)傳感器可在很大的溫度范圍內(nèi)提供非常穩(wěn)定的模擬輸出。

The following Hall effect sensors are ideal for custom analog sensing applications:

以下霍爾效應(yīng)傳感器非常適合定制模擬傳感應(yīng)用：

　　Rotary Hall Effect Sensor Without using any moving parts,this semiconductor-based sensor combines a Hall effect sensing element with circuitry to provide an analog output signal that corresponds to the change in the rotating magnetic field.A rotary Hall effect sensor offers two output options:analog or pulse-width modulation(PWM).The device is programmable so that the engineer can associate a specific output voltage or PWM to a precise degree of rotation.

　　旋轉(zhuǎn)霍爾效應(yīng)傳感器不使用任何運動部件，這種基于半導(dǎo)體的傳感器將霍爾效應(yīng)傳感元件與電路相結(jié)合，以提供與旋轉(zhuǎn)磁場變化相對應(yīng)的模擬輸出信號。旋轉(zhuǎn)霍爾效應(yīng)傳感器提供兩個輸出選項：模擬或脈沖寬度調(diào)制（PWM）。該器件是可編程的，因此工程師可以將特定的輸出電壓或PWM與精確的旋轉(zhuǎn)度相關(guān)聯(lián)。

　　Multiple programming points are available up to 360 degrees of rotation.Each programming point represents a voltage or PWM output value that corresponds to a given angle of the magnetic field.This results in a high-accuracy,high-resolution ratiometric output signal relative to the degree of rotation.

　　多個編程點最多可旋轉(zhuǎn)360度。每個編程點代表與給定磁場角度相對應(yīng)的電壓或PWM輸出值。這就產(chǎn)生了相對于旋轉(zhuǎn)度的高精度、高分辨率的比率測量輸出信號。

Linear Hall Effect Sensor

線性霍爾效應(yīng)傳感器

　　The linear Hall effect sensor measures the linear movement of a magnetic field rather than the rotation.This sensor is programmable for a set output voltage that is ratiometric for a given travel distance.(Its output options are the same as the rotary Hall effect sensor.)The sensor measures the linear movement and relative flux angle of a magnetic actuator up to 30 mm of travel distance with a single Hall effect chip.This results in a ratiometric output signal relative to the precise movement of the sensor.

　　線性霍爾效應(yīng)傳感器測量磁場的線性運動，而不是旋轉(zhuǎn)。該傳感器可針對設(shè)定的輸出電壓進行編程，該輸出電壓對于給定的行進距離是成比例的。（其輸出選項與旋轉(zhuǎn)式霍爾效應(yīng)傳感器相同。）該傳感器使用單個霍爾效應(yīng)芯片可測量磁致動器的線性運動和相對磁通角，最大行程為30 mm。這導(dǎo)致相對于傳感器精確運動的比例輸出信號。

Reed and Hall Effect Deliver High-Reliability Digital Sensing

簧片和霍爾效應(yīng)提供高可靠性的數(shù)字傳感

　　Industrial automation customers who want to verify that an object such as an elevator door is in its proper position prefer digital output.The following digital sensors deliver outstanding reliability in custom magnetic sensing applications:

　　工業(yè)自動化用戶如果想驗證某個對象（如電梯門）是否處于正確位置，則更喜歡數(shù)字輸出。以下數(shù)字傳感器在定制磁感應(yīng)應(yīng)用中提供卓越的可靠性：

Reed Switch

簧片開關(guān)

　　A reed switch has contacts that are hermetically sealed within a glass tube with precious metal contact material.This electrical switch does not require any power to operate.

　　簧片開關(guān)的觸點采用貴金屬觸點材料密封在玻璃管內(nèi)。該電氣開關(guān)不需要任何電源即可操作。

Digital Hall Effect Sensor

數(shù)字霍爾效應(yīng)傳感器

　　These sensors combine a Hall effect sensing element with circuitry to provide a digital on/off output signal that corresponds to a change in the magnetic field without using any moving parts.The Hall effect device’s active circuitry draws a small amount of current at all times.

　　這些傳感器將霍爾效應(yīng)傳感元件與電路相結(jié)合，以提供與磁場變化相對應(yīng)的數(shù)字開/關(guān)輸出信號，而無需使用任何移動部件。霍爾效應(yīng)器件的有源電路始終會吸收少量電流。

Conclusion

結(jié)論

　　Environmental hazards are abundant in industrial automation and motion control environments.Designing a magnetic circuit that incorporates a robust magnetic sensor is the key to delivering a precise,reliable industrial automation solution.For some industrial applications,a custom magnetic sensor may be needed for long-term reliability.Reed switches and Hall effect sensors are perfect for digital applications that require exceptional reliability such as elevator door closure detection systems.Rotary and linear Hall effect sensors enhance the stability and precision of custom analog applications such as fluid flow and automatic pick-and-place systems.

　　工業(yè)自動化和運動控制環(huán)境中存在著大量的環(huán)境危害。設(shè)計一個集成了強大磁傳感器的磁路是提供精確、可靠的工業(yè)自動化解決方案的關(guān)鍵。對于某些工業(yè)應(yīng)用，可能需要一個定制的磁傳感器來實現(xiàn)長期的可靠性?；善_關(guān)和霍爾效應(yīng)傳感器非常適合需要特殊可靠性的數(shù)字應(yīng)用，如電梯門關(guān)閉檢測系統(tǒng)。旋轉(zhuǎn)和線性霍爾效應(yīng)傳感器增強了自定義模擬應(yīng)用（如流體流動和自動取放系統(tǒng)）的穩(wěn)定性和精度。