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Tg為電機所帶負(fù)載轉(zhuǎn)矩的下限值,(Th—Tg)/Th為轉(zhuǎn)矩波動的相對誤差,相數(shù)越多,此值越小,對降低振動越有利。亦即,相數(shù)越多,電機產(chǎn)生的轉(zhuǎn)矩波動幅值越小,頻率越高,產(chǎn)生的振動越?。ㄓ嘘P(guān)說明在后面章節(jié))。高轉(zhuǎn)速多相步進(jìn)電機的優(yōu)點是能高速響應(yīng)。步進(jìn)電機為同步電機,繞組電流頻率與轉(zhuǎn)子速度成正比例,若電機高速運轉(zhuǎn),則繞組電流角頻率ω增加,使繞組電感L產(chǎn)生的電抗ωL加大,從而降低電流,致使轉(zhuǎn)矩下降。當(dāng)用數(shù)千pps驅(qū)動步進(jìn)電機時,電機繞組阻抗Z與直流電阻相比,電抗ωL將大幅增加。






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