TRICONEX AI3281輸入模塊,AI3281使用速度
交流伺服電機(jī)的控制精度由電機(jī)軸后端的旋轉(zhuǎn)編碼器保證。以M2交流伺服電機(jī)為例,對于帶2500線增量式編碼器的電機(jī)而言,由于驅(qū)動器內(nèi)部采用了四倍頻技術(shù),其脈沖當(dāng)量為360°/10000=0.036°。對于帶17位編碼器的電機(jī)而言,驅(qū)動器每接收131072個脈沖電機(jī)轉(zhuǎn)一圈,即其脈沖當(dāng)量為360°/131072=0.0027466°,是步距角為1.8°的步進(jìn)電機(jī)的脈沖當(dāng)量的1/655。
TRICONEX AI3281輸入模塊低頻特性不同
步進(jìn)電機(jī)在低速時易出現(xiàn)低頻振動現(xiàn)象。振動頻率與負(fù)載情況和驅(qū)動器性能有關(guān),一般認(rèn)為振動頻率為電機(jī)空載起跳頻率的一半。這種由步進(jìn)電機(jī)的工作原理所決定的低頻振動現(xiàn)象對于機(jī)器的正常運(yùn)轉(zhuǎn)非常不利。當(dāng)步進(jìn)電機(jī)工作在低速時,一般應(yīng)采用阻尼技術(shù)來克服低頻振動現(xiàn)象,比如在電機(jī)上加阻尼器,或驅(qū)動器上采用細(xì)分技術(shù)等??构舱?/p>
步進(jìn)系統(tǒng)的一點(diǎn)不足就在于存在著固有的共振點(diǎn),SR系列步進(jìn)驅(qū)動器自動計(jì)算共振點(diǎn),并以此來調(diào)整控制算法,從而達(dá)到抑制共振的目的,極大的提高了中頻穩(wěn)定性,使得高速時有更大的力矩輸出,更優(yōu)異的高速性能。
交流伺服電機(jī)運(yùn)轉(zhuǎn)非常平穩(wěn),即使在低速時也不會出現(xiàn)振動現(xiàn)象。交流伺服系統(tǒng)具有共振抑制功能,可彌補(bǔ)機(jī)械的剛性不足,并且系統(tǒng)內(nèi)部具有頻率解析機(jī)能(FFT),可檢測出機(jī)械的共振點(diǎn),便于系統(tǒng)調(diào)整。
雙極性驅(qū)動電路
振動抑制
M2伺服系統(tǒng)的振動抑制功能包含共振抑制及阻尼減振兩個部分。
共振抑制功能
提供兩組陷波濾波器(Notch Filters),有效地克服由于設(shè)備機(jī)械結(jié)構(gòu)固有特性造成的共振問題。
阻尼減振功能
可通過調(diào)節(jié)控制器提供的阻尼系數(shù)改善整個運(yùn)動系統(tǒng)的阻尼特性,從而有效減小系統(tǒng)的振動。
矩頻特性不同
步進(jìn)電機(jī)的輸出力矩隨轉(zhuǎn)速升高而下降,且在較高轉(zhuǎn)速時會急劇下降,所以其最高工作轉(zhuǎn)速一般在300~600RPM。交流伺服電機(jī)為恒力矩輸出,即在其額定轉(zhuǎn)速(一般為2000RPM或3000RPM)以內(nèi),都能輸出額定轉(zhuǎn)矩,在額定轉(zhuǎn)速以上為恒功率輸出。
相同尺寸下的伺服電機(jī)與步進(jìn)電機(jī)的速度力矩特性比較
current (such as bulb, inductive load, etc.), the overload capacity of transistor is small and needs to be reduced more.
4. The response speed of transistor is faster than that of relay. The principle of relay output type is that CPU drives the relay coil to make the contact pull in, so that the external power supply drives the external load through the closed contact. Its open circuit leakage current is zero and the response time is slow (about 10ms). The principle of transistor output type is that the CPU turns on and off the transistor through optical coupling to control the external DC load, with fast response time (about 0.2ms or less). Transistor output is generally used for high-speed output, such as servo / stepping, and for output with high action frequency.Under the rated working condition, the relay has the service life of action times. The transistor is only aging without the limit of use times. The relay is a mechanical component, so it has the service life. The transistor is an electronic