广东11选5

变频器批发

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企业名称:临沂兰山区西川变频器厂

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变频器基础知识(下)

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变频器基础知识(下)

发布日期:2019-03-13 作者: 点击:

5
电动机使用工频电源驱动时

电动机使用工频电源驱动时,电压下降则电流增加;对于变频器驱动,如果频率下降时电压也下降,那么电流是否增加?


频率下降(低速)时,如果输出相同的功率,则电流增加,但在转矩一定的条件下,电流几乎不变。变频器厂


6
采用变频器运转时,电机的起动电流、起动转矩怎样?

广东11选5CAIYONGBIANPINQIYUNZHUAN,SUIZHEDIANJIDEJIASUXIANGYINGTIGAOPINLVHEDIANYA,QIDONGDIANLIUBEIXIANZHIZAI150%EDINGDIANLIUYIXIA(GENJUJIZHONGBUTONG,WEI125%~200%)。YONGGONGPINDIANYUANZHIJIEQIDONGSHI,QIDONGDIANLIUWEI6~7BEI,YINCI,JIANGCHANSHENGJIXIEDIANQISHANGDECHONGJI。CAIYONGBIANPINQICHUANDONGKEYIPINGHUADIQIDONG(QIDONGSHIJIANBIANZHANG)。QIDONGDIANLIUWEIEDINGDIANLIUDE1.2~1.5BEI,QIDONGZHUANJUWEI70%~120%EDINGZHUANJU;DUIYUDAIYOUZHUANJUZIDONGZENGQIANGGONGNENGDEBIANPINQI,QIDONGZHUANJUWEI100%YISHANG,KEYIDAIQUANFUZAIQIDONG。BIANPINQICHANG

变频器厂




7
V/f模式是什么意思?

PINLVXIAJIANGSHIDIANYAVYECHENGBILIXIAJIANG,ZHEIGEWENTIYIZAIHUIDA4SHUOMING。VYUfDEBILIGUANXISHIKAOLVLEDIANJITEXINGERYUXIANJUEDINGDE,TONGCHANGZAIKONGZHIQIDECUNCHUZHUANGZHI(ROM)ZHONGCUNYOUJIZHONGTEXING,KEYIYONGKAIGUANHUOBIAODUPANJINXINGXUANZE.BIANPINQICHANG


8
按比例地改V和f时,电机的转矩如何变化?

广东11选5PINLVXIAJIANGSHIWANQUANCHENGBILIDIJIANGDIDIANYA,NEIMEYOUYUJIAOLIUZUKANGBIANXIAOERZHILIUDIANZUBUBIAN,JIANGZAOCHENGZAIDISUXIACHANSHENGDIZHUANJUYOUJIANXIAODEQINGXIANG。YINCI,ZAIDIPINSHIJIDINGV/f,YAOSHISHUCHUDIANYATIGAOYIXIE,YIBIANHUODEYIDINGDIQIDONGZHUANJU,ZHEIZHONGBUCHANGCHENGZENGQIANGQIDONG。KEYICAIYONGGEZHONGFANGFASHIXIAN,YOUZIDONGJINXINGDEFANGFA、XUANZEV/fMOSHIHUODIAOZHENGDIANWEIQIDENGFANGFA


9
在说明书上写着变速范围60~6Hz,即10:1,那么在6Hz以下就没有输出功率吗?

ZAI6HzYIXIARENGKESHUCHUGONGLV,DANGENJUDIANJIWENSHENGHEQIDONGZHUANJUDEDAXIAODENGTIAOJIAN,ZUIDISHIYONGPINLVQU6HzZUOYOU,CISHIDIANDONGJIKESHUCHUEDINGZHUANJUERBUHUIYINQIYANZHONGDEFAREWENTI。BIANPINQISHIJISHUCHUPINLV(QIDONGPINLV)GENJUJIZHONGWEI0.5~3Hz.BIANPINQICHANG


10
对于一般电机的组合是在60Hz以上也要求转矩一定,是否可以?

通常情况下是不可以的。在60Hz以上(也有50Hz以上的模式)电压不变,大体为恒功率特性,在高速下要求相同转矩时,必须注意电机与变频器容量的选择。



11
所谓开环是什么意思?

广东11选5JISUOSHIYONGDEDIANJIZHUANGZHISHESUDUJIANCHUQI(PG),JIANGSHIJIZHUANSUFANKUIJIKONGZHIZHUANGZHIJINXINGKONGZHIDE,CHENGWEI“BIHUAN”,BUYONGPGYUNZHUANDEJIUJIAOZUO“KAIHUAN”。TONGYONGBIANPINQIDUOWEIKAIHUANFANGSHI,YEYOUDEJIZHONGLIYONGXUANJIANKEJINXINGPGFANKUI.BIANPINQICHANG


12
实际转速对于给定速度有偏差时如何办?

KAIHUANSHI,BIANPINQIJISHISHUCHUJIDINGPINLV,DIANJIZAIDAIFUZAIYUNXINGSHI,DIANJIDEZHUANSUZAIEDINGZHUANCHALVDEFANWEINEI(1%~5%)BIANDONG。DUIYUYAOQIUDIAOSUJINGDUBIJIAOGAO,JISHIFUZAIBIANDONGYEYAOQIUZAIJINYUJIDINGSUDUXIAYUNZHUANDECHANGHE,KECAIYONGJUYOUPGFANKUIGONGNENGDEBIANPINQI(XUANYONGJIAN)。



13
如果用带有PG的电机,进行反馈后速度精度能提高吗?

JUYOUPGFANKUIGONGNENGDEBIANPINQI,JINGDUYOUTIGAO。DANSUDUJINGDUDEZHIQUJUEYUPGBENSHENDEJINGDUHEBIANPINQISHUCHUPINLVDEFENBIANLV。BIANPINQICHANG


14
失速防止功能是什么意思?

RUGUOJIDINGDEJIASUSHIJIANGUODUAN,BIANPINQIDESHUCHUPINLVBIANHUAYUANYUANCHAOGUOZHUANSU(DIANJIAOPINLV)DEBIANHUA,BIANPINQIJIANGYINLIUGUOGUODIANLIUERTIAOZHA,YUNZHUANTINGZHI,ZHEIJIUJIAOZUOSHISU。WEILEFANGZHISHISUSHIDIANJIJIXUYUNZHUAN,JIUYAOJIANCHUDIANLIUDEDAXIAOJINXINGPINLVKONGZHI。DANGJIASUDIANLIUGUODASHISHIDANGFANGMANJIASUSULV。JIANSUSHIYESHIRUCI。LIANGZHEJIEHEQILAIJIUSHISHISUGONGNENG。BIANPINQICHANG


15
有加速时间与减速时间可以分别给定的机种,和加减速时间共同给定的机种,这有什么意义?

JIAJIANSUKEYIFENBIEJIDINGDEJIZHONG,DUIYUDUANSHIJIANJIASU、HUANMANJIANSUCHANGHE,HUOZHEDUIYUXIAOXINGJICHUANGXUYAOYANGEJIDINGSHENGCHANJIEPAISHIJIANDECHANGHESHISHIYIDE,DANDUIYUFENGJICHUANDONGDENGCHANGHE,JIAJIANSUSHIJIANDOUJIAOZHANG,JIASUSHIJIANHEJIANSUSHIJIANKEYIGONGTONGJIDING。BIANPINQICHANG


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