霍爾開關(guān)在電機(jī)中的作用：在一定的位置改變電流方向-讓線圈產(chǎn)生相反的磁極!簡單一點(diǎn)的說就是換項(xiàng)用!利用的是定子(磁場不變)和轉(zhuǎn)子{線圈電流不同(當(dāng)線圈到達(dá)一定位置霍爾給出信號(hào)改變電流方向)產(chǎn)生磁場方向不同}所產(chǎn)生的磁場同性相吸異性相斥來產(chǎn)生動(dòng)力?；魻栭_關(guān)在電機(jī)中一般起到檢測電機(jī)轉(zhuǎn)速的作用
1，霍爾開關(guān)在逆變器中的應(yīng)用
在逆變器中，用霍爾電流傳感器進(jìn)行接地故障檢測、直接側(cè)和交流側(cè)的模擬量傳感，以保證逆變器能安全工作。
2，霍爾開關(guān)在接地故障檢測中的應(yīng)用
在配電和各種用電設(shè)備中，可靠的接地是保證配電和用電設(shè)備安全的重要措施。采用霍爾元件電流傳感器來進(jìn)行接地故障的自動(dòng)監(jiān)測，可保證用電安全。
3，霍爾開關(guān)在電子點(diǎn)焊機(jī)中的應(yīng)用
在電子點(diǎn)焊機(jī)電源中，霍爾電流傳感器起測量和控制作用。它的快速響應(yīng)能再現(xiàn)電流、電壓波形，將它們反饋到可控整流器A、B，可控制其輸出。用斬波器給直流迭加上一個(gè)交流，可更精確地控制電流。用霍爾元件電流傳感器進(jìn)行電流檢測，既可測量電流的真正瞬時(shí)值，，又不致引入損耗。
4，霍爾開關(guān)在不間斷電源中的應(yīng)用
霍爾電流傳感器1發(fā)出信號(hào)并進(jìn)行反饋，以控制晶閘管的觸發(fā)角，電流傳感器2發(fā)出的信號(hào)控制逆變器，傳感器3控制浮充電源。用霍爾電流傳感器進(jìn)行控制，保證逆變電源正常工作。由于其響應(yīng)速度快，特別適用于計(jì)算機(jī)中的不間斷電源。
5，霍爾開關(guān)在交流變頻調(diào)速電機(jī)中的應(yīng)用
用變頻器來對(duì)交流電機(jī)實(shí)施調(diào)速，在世界各發(fā)達(dá)國家已普遍使用，且有取代直流調(diào)速的趨勢(shì)。用變頻器控制電機(jī)實(shí)現(xiàn)調(diào)速，可節(jié)省10%以上的電能。在變頻器中，霍爾元件電流傳感器的主要作用是保護(hù)昂貴的大功率晶體管。由于霍爾電流傳感器的響應(yīng)時(shí)間短于1μs，因此，出現(xiàn)過載短路時(shí)，在晶全管未達(dá)到極限溫度之前即可切斷電源，使晶體管得到可靠的保護(hù)。
6，霍爾開關(guān)在電網(wǎng)無功功率自動(dòng)補(bǔ)償中的應(yīng)用
電力系統(tǒng)無功功率的自動(dòng)補(bǔ)償，是指補(bǔ)償容量隨負(fù)荷和電壓波動(dòng)而變化，及時(shí)準(zhǔn)確地投入和切除電容器，避免補(bǔ)償過程中出現(xiàn)過補(bǔ)償和欠補(bǔ)償?shù)牟缓侠砗筒唤?jīng)濟(jì)，使電網(wǎng)的功率因數(shù)始終保持最佳。無功功率的自動(dòng)采樣若用霍爾電流、電壓傳感器來進(jìn)行，在保證“及時(shí)、準(zhǔn)確”上具有顯著的優(yōu)點(diǎn)。因?yàn)樗鼈兊捻憫?yīng)速度快，且無相位差。
7，霍爾開關(guān)用于電車斬波器的控制
電車中的調(diào)速是由調(diào)整電壓實(shí)現(xiàn)的。將霍爾電流傳感器和其它元件配合使用，并將傳感器的所有信號(hào)輸入控制系統(tǒng)，可確保電車正常工作。
Hall switch in the motor role: in a certain position to change the direction of the current - so that the coil produces the opposite pole! A simpler way to say it is to switch terms! The use of stator (magnetic field is unchanged) and rotor {coil current is different (when the coil reaches a certain position hall gives the signal to change the direction of the current) the direction of the magnetic field is different} generated by magnetic field like attraction opposite to repel to generate power. Hall switch plays a role in detecting motor speed
1. Application of hall switch in inverter
In the inverter, hall current sensor is used for ground fault detection and analog sensing of direct side and ac side to ensure the safe operation of the inverter.
2. Application of hall switch in ground fault detection
In distribution and various electrical equipment, reliable grounding is an important measure to ensure the safety of distribution and electrical equipment. Hall element current sensor is used to automatically monitor the grounding fault, which can ensure the safety of electricity.
3. Application of hall switch in electronic spot welding machine
Hall current sensor is used to measure and control electronic spot welder power supply. Its rapid response can reproduce current and voltage waveforms and feed them back to controllable rectifier A and B, which can control their output. The current can be more accurately controlled by adding an ac to the dc stack with a chopper. The real instantaneous value of current can be measured by using hall element current sensor, and no loss can be introduced.
4. Application of hall switch in uninterruptible power supply
Hall current sensor 1 sends a signal and gives feedback to control the trigger Angle of thyristor, the signal sent by current sensor 2 controls the inverter, and the floating charging source is controlled by sensor 3. Hall current sensor is used to control the inverter. Because of its fast response time, it is especially suitable for uninterruptible power supply in computer.
Hall switch in ac frequency conversion motor application
It has been widely used in developed countries in the world to use frequency converter to implement speed regulation of ac motor, and it has the tendency to replace dc speed regulation. Using frequency converter to control the motor to realize speed regulation, can save more than 10% of electric energy. In frequency converters, the main function of hall element current sensor is to protect expensive high power transistors. Since the response time of the hall current sensor is less than 1 micron, an overload short circuit can cut off the power supply before the crystal tube reaches its limit temperature, thus providing reliable protection for the transistor.
6. Application of hall switch in automatic reactive power compensation of power grid
Automatic compensation of reactive power in power system refers to the compensation capacity changing with load and voltage fluctuation, timely and accurate input and removal of capacitors, to avoid unreasonable and uneconomic over-compensation and under-compensation in the compensation process, so as to maintain the best power factor of the power grid. If hall current and voltage sensor are used for automatic sampling of reactive power, it has significant advantages in ensuring "timely and accurate". Because they respond quickly and there is no phase difference.
7. Hall switch is used for the control of tram chopper
The speed adjustment in the trolley is realized by adjusting the voltage. The hall current sensor and other components are used together, and all signals from the sensor are input into the control system to ensure the normal operation of the trolley.