BentlyNevada330130-040-00-05异步电机在启动时，转差率S接近1时，转差大时，无功率大，功率因数低；异步电机在额定运行时，转差率S接近0时，转差小时，无功率小，功率因数高。而变频器在启动电机时，输出频率低，就可以保证异步电机转差在额定转差范围内，所以保证电机始终工作在高功率因数状态。所以可以这样说，变频器改变输出频率，控制异步电机转差在额定转差范围内，从而保证电机的运行功率因数高。如果变频器输出频率f与输出电压U的比值一定时，电机磁通Φ是个定值，即励磁电流（NIo）不变。只有电机磁通Φ减小时，励磁电流（NIo）减小所以变频器提高功率因数的主要方式是控制异步电机转差率来实现的当异步电机处于大马拉小车时，变频器可调整频压比，减小电机磁通Φ，有降低无功电流，提高功率因数的作用。所以，简单说，“低频时，输出电压低，无功电流小”的结论是错误的,降低频率，降低电压，但频压比恒定，是保证电机铁心磁通Φ不变，等于电机设计磁通Φ，即工频时的磁通Φ。当大马拉小车时，可以降低电机磁通Φ，也就是改变频压比的值，也就是在相同频率下，适当降低电压，降低励磁电流。降低频率，降低电压，不降低磁通Φ，励磁电流不变，无功功率不变。P0940BRE4809-436-016-D1784-PKTX2711-K10C152711-NM2322711-NMCCEX-DWR16LS6804-I400A1756-PA72C1756-A131756-ENBT1756-IB321756-IF161756-OB321756-TBCH1756-TBS6H1747-L5511747-L5511756-IF16VT3006-S35/R1FBM042750060IBSTME24AL4/SF42750578IBST24AO42750769IBSSTZF24BKRB-T2751700IBSTME24BDO1/3-2502752932IBSSTME24BKRB-T140ACI04000140CPS11420140DDO353003IF681.962098-DSD-01051403776-1001747-L542A02B-0236-C131CS4HB39ACM28AEN16137-118IC200PWR102FCIMR-HB4A0112ABA6FC5210-0DA20-2AA1416NHM300301747-M13PXI-83301762-IT4LC1F185VM100/R-TAES2000-9725GPIB-USB-HS140CPS114201756-TBNH1746-IA161746-NT81746-OW161746-P4140***I030001756-ENBTTSXP57253CUB4LPA06B-0113-B075#0005SPEEDREGULATORMAXSPEED2140CPS114201756-CNBR1756-ENBT1756-IR6I1756-L61H-***-J-141-D1746-IB161746-OW161746-P21747-L5511746-NIO4V1746-OB321746-OW8DGM60-ASAKFBM2013951746-N04I1746-NR46ES5980-OAE111747-AICIC697CGR9351746-0W161762-IF2OF21394-AM04DV505-400SAB490NRP95400V-103-1C24-TFBM026ES7123-1F***-0AB01756-ENBT602453-59AOKYM6W21IC697BEM731VG-301+VG-036FP2-HSCT140CPS11420140CPU11303140DDI35300140DDO353001746-IM161746-OW16140CRA93100K-TFT-AN-CCFTMA-0185-100MA-0186-1001747-CP3(USB)1747-CP3(串口)1747-L5421756-L6111BRCX-300-J-10C11BRCX-300-J-10C.1746-NI83503E3604E3700A3805E83129563-8109662-8109791-6209861-610BPHM64A06B-6093-H1523150-MCM2098-DSD-010RCM470LY1756-CNB/D1756-DNB1756-L631606-XLS80E1756-CNB1756-ENBT1756-L611756-PA72PS-M06D12S5-NJ1L(S)C25DND2301/2NPT(M)/直径14*2材质304SSIFRATC-600ARMS-TSG-TZATCS-15SCXI-1000SCXI-1166SCXI-1327PPC-105TDLS6100140NOE77101***0H-C3DR-DE1756-L61B1756-CNB1770-KFD1756-IF6I1756-PA721756-PA75140DRA84000140CPU43412A140DDI841001747-L551CIMR-XCAA21P5IC693CPU364CLM01.3-X-0-4-B-FW6***6545-0DA10-0AX0OP-620MA-0185-1001771-OFE23CP260.60.1GPIB-USB-HSWATLOWANAFAZECLS208MDD065D-N-060-N2M-095PB1MDD112D-N030-N2M-130GA0MPL-A320H-HJ22AA1756-L61140CPS22400M22NRXA-LNF-NS-00DSDP150ACS510-01-07A2-4ACS550-01-125A-4ACS550-01-180A-46***66480AC113AX0MSR16R/T6***66480AC113AX0TSXP57103M1756-TBCH6***3607-1JC20-0AX13F88L-16000306385S0207KT971756-A41756-CNBR1756-ENBT1756-L611756-PA721756-RM1756-RMC1EFC3M080P0916DB1746-IB321756-CNB/D1756-OW16I1756-TBCH/A1784-PKTX5136-PFB-1041746-A131746-NI836643805E4119ADPS-400ABXBTGT2130IC200ALG230IC200ALG320IC200ALG620IC200CHS022IC200CPUE05IC200MDL640IC200MDL740IC200PWR002IC698CHS009IC698CRE030IC698ETM001IC698PSA100L3MF-032/64GFOKS-G序列号S/N：118516-002AS-S908-1201756-DNB/D140CPS11420140CRP81100140DA0853003500-15-02-02-0083121746-NT4140DAI753001756-BA1AS-P810-000IMMFP12MVME5110-2261-MPC74101734D-IB8XOW81746-NO4I6***66480AC113AX06FC5247-0AA30-0AA01746-A131746-NI8SIEMENSOP76***3607-1JC20-0AX0MC-4/11/03/4001771-CP2140NOE77101140DAI74000140DAO84210140XTS0020020B-VECTB-C0MVI56-MCMIC697ALG440NAIO-03J/E-CF-021746-NI8140CPS11420140CPU53414A140NOE71100140XBP00600170AAI14000170AAO92100170ADI34000170ADO34000170INT11000171CCC96030172JNN21032BMXCPS2000BMXDDI1602BMXDDO1602BMXP342020BMXXBP0800TSXMRPC002MTSXP57103MSSU76UC24-48V1756-L621756-CNB1756-ENBT1756-IB321756-L611756-OB321756-PA751756-CNB1756-OF81756-OW16I1756-IF161756-IM16I1756-PA75140AII33010EM4-101-AA21771-IR/D1746-NI81746-NR81746-OW16NW-RR85-0011756-ENBT/A1756-IB16/A1756-OB16I/A1756-PA72/CC20-CPU74-EC20-MC223140ACI03000140ACO020001756-CNBH117AL112F11756-L55M14IC660BBA0206***66480AC113AX0140CPS114201761-NET-ENIXBTGT2130140CPU65150140DDO35300140XTS00200140DDI353006ES7272-0AA30-0YA11746-OW16TM22A20B-2902-0411/02A9200SHCPU6ES7151-1AA03-0AB06ES7144-1FB31-0XB01756-CNBR/DKSD1-081756-IF16140CPS214006***66480AC113AX0)