軸承加熱器的軟啟動(dòng)研究

電氣自動(dòng)化論文編號(hào):ZD946    論文字?jǐn)?shù):13281,頁數(shù):33

目  錄
摘 要 I
Abstract II
1  緒論 1
1.1背景 1
1.2選題的意義 2
2  軟啟動(dòng)技術(shù)的基本知識(shí) 3
2.1 軟啟動(dòng)器 3
2.2 軟啟動(dòng)的啟動(dòng)方式 3
 2.3 軟啟動(dòng)的特點(diǎn) 4
2.4 電動(dòng)機(jī)軟啟動(dòng)技術(shù)的應(yīng)用 4
2.5 常用的軟啟動(dòng)電路 5
2.5.1 采用功率熱敏電阻電路 5
2.5.2 采用SCR-R電路 6
2.5.3 具有斷電檢測(cè)的SCR-R電路 6
2.5.4 繼電器K1與電阻R構(gòu)成的電路 7
2.5.5 采用定時(shí)觸發(fā)器的繼電器與限流電阻的電路 7
2.5.6 過零觸發(fā)的光耦可控硅與雙向可控硅構(gòu)成的電路 8
3 新型軟啟動(dòng)電路  9
3.1 新型可內(nèi)置軟啟動(dòng)電路 9
3.1.1 軟啟動(dòng)原理 9
3.1.2 新型軟啟動(dòng)電路分析 9
3.2 固體軟啟動(dòng)開關(guān)控制 11
3.2.1 電路結(jié)構(gòu) 11
3.2.2 工作原理 12
4 軸承加熱器  14
4.1 軸承加熱器 14
4.2 軸承加熱器的原理 14
4.3 簡(jiǎn)易軸承加熱器的制作 14
4.3.1 簡(jiǎn)易軸承加熱器的結(jié)構(gòu)和工作原理 14
4.3.2 加熱溫度的確定 15
4.3.3 軸承加熱與安裝 16
5 軸承加熱器的軟啟動(dòng)電路  17
5.1開關(guān)導(dǎo)通的沖擊電流 17
5.2 新型負(fù)載開關(guān)的結(jié)構(gòu) 18
5.2.1 輸入輸出電路 19
5.2.2 負(fù)載開關(guān)基本電路 19
5.2.3 電平轉(zhuǎn)移電路 20
5.2.4 軟啟動(dòng)電路 21
5.2.5 帶軟啟動(dòng)的負(fù)載開關(guān)電路 22
5.2.6 電路的特點(diǎn) 22
5.3有關(guān)元器件的選擇在電路中主要選擇的元器件 23
5.4新型軟啟動(dòng)元器件 24
6  結(jié)束語 26
致謝 27
參考文獻(xiàn) 28
附錄1 29

摘 要
 通常對(duì)中小容量的電機(jī)，變壓器等電器均采用直接啟動(dòng),即電器在額定電壓下直接啟動(dòng)。例如電器直接啟動(dòng)時(shí), 啟動(dòng)電流大, 可達(dá)額定電流的5～7 倍, 造成電動(dòng)機(jī)繞組因啟動(dòng)電流過大引起過熱,從而加速絕緣老化,會(huì)造成供電網(wǎng)絡(luò)電壓降低過大等缺點(diǎn)。開關(guān)電源由于具有效率高,輸出電流大,靜態(tài)電流小,體積小等優(yōu)點(diǎn)而在手持式設(shè)備和便攜式產(chǎn)品中得到廣泛應(yīng)用,成為了電源ASIC的主力軍而典型的開關(guān)電源在啟動(dòng)過程中,容易產(chǎn)生浪涌電流并引起輸出電壓過沖,可能對(duì)電子系統(tǒng)造成損傷,因此需要軟啟動(dòng)電路。
 本文主要介紹了幾種軟啟動(dòng)電路的特點(diǎn)和功能，為了配合軸承加熱器，選取了在開關(guān)電路中加上軟啟動(dòng)電路，為了使加熱器平滑的啟動(dòng)和免維護(hù)，設(shè)計(jì)這個(gè)帶軟啟動(dòng)的負(fù)載開關(guān)來實(shí)現(xiàn)保護(hù)節(jié)能控制。

關(guān)鍵詞：軸承加熱器  軟啟動(dòng)  負(fù)載開關(guān)

Abstract
 Usually small and medium-sized Motors, transformers and other electrical appliances are used directly to start, that is motor rated voltage in the direct start. Directly activate the AC motor, the starting current, and rated current up to 5 ~ 7 times, resulting in motor windings due to excessive starting current over-heated, thus speeding up the aging of insulation, this will result in electricity supply networks, Result in reduced power supply network voltage is too large, such as the shortcomings. Switching power supply because of its high efficiency, large output current, static current, the advantages of small size in the hand-held devices and portable products are widely used, has become the main force of the AS IC power and a typical switching power supply in the boot process, easily lead to surge current and cause the output voltage overshoot may cause damage to electronic systems, so the need for soft-start circuit.   In this paper, several soft-start circuit of the features and functionality, in line with the Bearing processing, select a switch circuit with soft-start circuit, in order to enable a smooth start-up heater and maintenance-free design with soft-start the load switch to achieve the protection of energy-saving control.
 
Keywords：Bearing InductionHeater ,soft-start , load switch