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步进电机与伺服电机的性能区别
步进电机作为一种开环控制的系统，和现代数字控制技术有着本质的联系。在目前国内的数字控制系统中，步进电机的应用十分广泛。随着全数字式交流伺服系统的出现，交流伺服电机也越来越多地应用于数字控制系统中。为了适应数字控制的发展趋势，运动控制系统中大多采用步进电机或全数字式交流伺服电机作为执行电动机。虽然两者在控制方式上相似（脉冲串和方向信号），但在使用性能和应用场合上存在着较大的差异。现就二者的使用性能作一比较。
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厦门仲鑫达自动化设备有限公司
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一、控制精度不同
两相混合式步进电机步距角一般为 1.8°、0.9°，五相混合式步进电机步距角一般为0.72 °、0.36°。也有一些高性能的步进电机通过细分后步距角更小。如三洋公司（SANYO DENKI）生产的二相混合式步进电机其步距角可通过拨码开关设置为1.8°、0.9°、0.72°、0.36°、0.18°、0.09°、0.072°、0.036°，兼容了两相和五相混合式步进电机的步距角。
交流伺服电机的控制精度由电机轴后端的旋转编码器保证。以三洋全数字式交流伺服电机为例，对于带标准2000线编码器的电机而言，由于驱动器内部采用了四倍频技术，其脉冲当量为360°/8000=0.045°。对于带17位编码器的电机而言，驱动器每接收131072个脉冲电机转一圈，即其脉冲当量为360°/131072=0.0027466°，是步距角为1.8°的步进电机的脉冲当量的1/655。
3RH1921-2EA02 AUXILIARY FRONT CC,S0-S3,LATERALLY,2NC Siemens
3RH1921-2EA20 AUXILIARY FRONT CC,S0-S3,LATERALLY,2NO Siemens
3RH1921-2FA04 AUXILIARY FRONT CC,S0-S3,4NC Siemens
3RH1921-2FA22 AUXILIARY FRONT CC,S0-S12,2NO&2NC Siemens
3RH1921-2FA31 AUXILIARY FRONT CC,S0-S3,3NO&1NC Siemens
3RH1921-2FA40 AUXILIARY FRONT CC,S0-S3,4NO Siemens
3RH1921-2FC22 AUXILIARY FRONT CC,S0-S3,2NO&2NC OVRLP Siemens
3RH1921-2FE22 AUXILIARY FRONTSS,C.CLMP,1NC+1NO+1EM+1EB Siemens
3RH1921-2FJ22 AUXILIARY FRONT,C.CLMP,2NC SEALED+2NO Siemens
3RH1921-2HA13 AUXILIARY CC FRONT,SO-S3,1NO+3NC Siemens
3RH1921-2HA22 AUXILIARY CC FRONT,SO-S3,2NO+2NC Siemens
3RH1921-2HA22-8YY8 AUX FRONT,FOR 4-POLE,SO-S3,2NO+2NC,CC Siemens
3RH1921-2HA31 AUXILIARY CC FRONT,SO-S3,3NO+1NC Siemens
3RH1921-2JA11 AUXILIARY SIDE, S3 1NO + 1NC,CAGE CLAMP Siemens
3RH1921-2JE11 AUXILIARY 2ND LATERAL CAGE CLAMP,1EM+1EB Siemens
3RH1921-2KA02 AUXILIARY 2ND SIDE S3-S12 2NC CAGE CLAMP Siemens
3RH1921-2KA20 AUXILIARY 2ND SIDE S3-S12 2NO CAGE CLAMP Siemens
3RH1921-2XA22-0MA0 AUXILIARY CC.BLK,2NO+2NC, LOC.DIGIT 5..8 Siemens
3RH1924-1GP11 PLC INTERFACE MODULE,S0-S3 Siemens
3RH2911-1AA01 AUX. SWITCH 1NC WIRE TOP SCREW Siemens
3RH2911-1AA10 AUX. SWITCH 1NO WIRE TOP SCREW Siemens
3RH2911-1BA01 AUX. SWITCH 1NC WIRE BELOW SCREW Siemens
3RH2911-1BA10 AUX. SWITCH 1NO WIRE BELOW SCREW Siemens
3RH2911-1DA02 AUX. SWITCH LATERAL 2NC S00+S0 SCREW Siemens
3RH2911-1DA11 AUX. SWITCH LATERAL 1NO+1NC S00 SCREW Siemens
3RH2911-1DA20 AUX. SWITCH LATERAL 2NO FOR S00 SCREW Siemens
3RH2911-1FA04 AUX. SWITCH 4NC FOR S00 & S0 SCREW Siemens
3RH2911-1FA22 AUX. SWITCH 2NO+2NC S00 & S0 SCREW Siemens
3RH2911-1FA22-0MA0 AUX.SWITCH BLK,FRONT,2NO+2NC, CURR.PAT Siemens
3RH2911-1FA40 AUX. SWITCH 4NO FOR S00 & S0 SCREW Siemens
3RH2911-1FB11 AUX. SWITCH 1NO+1NC S00 & S0 SCREW Siemens
3RH2911-1FB22 AUX. SWITCH 2NO+2NC S00 & S0 SCREW Siemens
3RH2911-1FC22 AUX. SWITCH 2NO+2NC S00 & S0 SCREW Siemens
3RH2911-1GA04 AUX. SWITCH 4NC FOR S00 SCREW Siemens
3RH2911-1GA13 AUX. SWITCH 1NO+3NC FOR S00 SCREW Siemens
3RH2911-1GA22 AUX. SWITCH 2NO+2NC FOR S00 SCREW Siemens
3RH2911-1GA31 AUX. SWITCH 3NO+1NC FOR S00 SCREW Siemens
3RH2911-1GA40 AUX. SWITCH 4NO FOR S00 SCREW Siemens
3RH2911-1HA01 AUX. SWITCH 1NC FOR S00 SCREW Siemens
3RH2911-1HA02 AUX. SWITCH 2NC FOR S00 SCREW Siemens
3RH2911-1HA03 AUX. SWITCH 3NC FOR S00 SCREW Siemens
3RH2911-1HA10 AUX. SWITCH 1NO FOR S0 SCREW Siemens
3RH2911-1HA11 AUX. SWITCH 1NO+1NC FOR S00 & S0 SCREW Siemens
3RH2911-1HA12 AUX. SWITCH 1NO+2NC FOR S00 & S0 SCREW Siemens
3RH2911-1HA13 AUX. SWITCH 1NO+3NC FOR S00 SCREW Siemens
3RH2911-1HA20 AUX. SWITCH 2NO FOR S0 SCREW Siemens
3RH2911-1HA21 AUX. SWITCH 2NO+1NC FOR S00 & S0 SCREW Siemens
3RH2911-1HA22 AUX. SWITCH 2NO+2NC FOR S00 & S0 SCREW Siemens
3RH2911-1HA30 AUX. SWITCH 3NO FOR S0 SCREW Siemens
3RH2911-1HA31 AUX. SWITCH 3NO+1NC FOR S00 SCREW Siemens
3RH2911-1LA11 AUX. SWITCH 1NO+1NC WIRE TOP SCREW Siemens
3RH2911-1LA20 AUX. SWITCH 2NO WIRE TOP SCREW Siemens
3RH2911-1MA11 AUX. SWITCH 1NO+1NC WIRE BELOW SCREW Siemens
3RH2911-1MA20 AUX. SWITCH 2NO WIRE BELOW SCREW Siemens
3RH2911-1NF02 AUX. SWITCH 2NC FOR S00 & S0 SCREW Siemens
3RH2911-1NF11 AUX. SWITCH 1NO+1NC FOR S00 & S0 SCREW Siemens
3RH2911-1NF20 AUX. SWITCH 2NO FOR S00 & S0 SCREW Siemens
3RH2911-1XA04-0MA0 AUX.SWITCH BLK,FRONT,4NC, CURR.PATH: 1 Siemens
3RH2911-1XA22-0MA0 AUX. SWITCH 2NO+2NC FOR S00 & S0 SCREW Siemens
3RH2911-1XA31-0MA0 AUX.SWITCH BLK,FRONT,3NO+1NC, CURR.PAT Siemens
3RH2911-1XA40-0MA0 AUX.SWITCH BLK,FRONT,4NO, CURR.PATH: 1 Siemens
3RH2911-1YA21-0MA0 AUX.SWITCH BLK,FRONT,2NO+1NC, CURR.PAT Siemens
3RH2911-2DA02 AUX. SWITCH LATERAL 2NC S00 SPRING Siemens
3RH2911-2DA11 AUX. SWITCH LATERAL 1NO+2NC S00 SPRING Siemens
3RH2911-2DA20 AUX. SWITCH LATERAL 2NO S00 SPRING Siemens
3RH2911-2DE11 AUX. SWITCH LAT 1NO+1NC S00 & S0 SPRING Siemens
3RH2911-2FA04 AUX. SWITCH 4NC FOR S00 & S0 SPRING Siemens
3RH2911-2FA22 AUX. SWITCH 2NO+2NC FOR S00 & S0 SPRNG Siemens
3RH2911-2FA40 AUX. SWITCH 4NO FOR S00 & S0 SPRNG Siemens
3RH2911-2FB11 AUX. SWITCH 1NO+1NC FOR S00 & S0 SPRNG Siemens
3RH2911-2FB22 AUX. SWITCH 2NO+2NC FOR S00 & S0 SPRNG Siemens
3RH2911-2FC22 AUX. SWITCH 2NO+2NC FOR S00 & S0 SPRNG Siemens
3RH2911-2GA04 AUX. SWITCH 4NC FOR S00 SPRING Siemens
3RH2911-2GA13 AUX. SWITCH 1NO+3NC FOR S00 SPRING Siemens
3RH2911-2GA22 AUX. SWITCH 2NO+2NC FOR S00 SPRING Siemens
3RH2911-2GA31 AUX. SWITCH 3NO+1NC FOR S00 SPRING Siemens
3RH2911-2GA40 AUX. SWITCH 4NO FOR S00 SPRING Siemens
3RH2911-2HA01 AUX. SWITCH 1NC FOR S00 SPRING Siemens
3RH2911-2HA02 AUX. SWITCH 2NC FOR S00 SPRING Siemens
3RH2911-2HA03 AUX. SWITCH 3NC FOR S00 SPRING Siemens
3RH2911-2HA10 AUX. SWITCH 1NO FOR S0 SPRING Siemens
3RH2911-2HA11 AUX. SWITCH 1NO+1NC FOR S00 & S0 SPRING Siemens
3RH2911-2HA12 AUX. SWITCH 1NO+2NC FOR S00 & S0 SPRNG Siemens
3RH2911-2HA13 AUX. SWITCH 1NO+3NC FOR S00 SPRNG Siemens
3RH2911-2HA20 AUX. SWITCH 2NO FOR S0 SPRING Siemens
3RH2911-2HA21 AUX. SWITCH 2NO+1NC FOR S00 & S0 SPRNG Siemens
3RH2911-2HA22 AUX. SWITCH 2NO+2NC FOR S00 & S0 SPRNG Siemens
3RH2911-2HA30 AUX. SWITCH 3NO FOR S0 SPRING Siemens
3RH2911-2HA31 AUX. SWITCH 3NO+1NC FOR S00 SPRING Siemens
3RH2911-2NF02 AUX. SWITCH 2NC FOR S00 & S0 SPRING Siemens
3RH2911-2NF11 AUX. SWITCH 1NO+1NC S00 & S0 SPRING Siemens
3RH2911-2NF20 AUX. SWITCH 2NO S00 & S0 SPRING Siemens
3RH2911-2XA04-0MA0 AUX. SWITCH 4NC FOR S00 W/N.O. AUX SPRNG Siemens
3RH2911-2XA20-0MA0 AUX.SWITCH BLK,FRONT,2NO, CURR.PATH: 1 Siemens
3RH2911-2XA22-0MA0 AUX. SWITCH 2NO+2NC FOR S00 & S0 SPRNG Siemens
3RH2911-2XA31-0MA0 AUX. SWITCH 3NO+1NC FOR S00 & S0 SPRNG Siemens
3RH2911-2XA40-0MA0 AUX. SWITCH 4NO FOR S00 & S0 SPRING Siemens
3RH2911-4DA11 AUX. SWITCH LATERAL 1NO+2NC S00 R LUG Siemens
3RH2911-4FA04 AUX. SWITCH 4NC FOR S00 & S0 RING LUG Siemens
3RH2911-4FA40 AUX. SWITCH 4NO FOR S00 & S0 RING LUG Siemens
3RH2911-4FB11 AUX. SWITCH 1NO+1NC S00 & S0 RING LUG Siemens
3RH2911-4FB22 AUX. SWITCH 2NO+2NC S00 & S0 RING LUG Siemens
3RH2911-4FC22 AUX. SWITCH 2NO+2NC S00 & S0 RING LUG Siemens
3RH2911-4GA04 AUX. SWITCH 4NC FOR S00 & S0 RING LUG Siemens
3RH2911-4GA13 AUX. SWITCH 1NO+3NC FOR S00 RING LUG Siemens
3RH2911-4GA22 AUX. SWITCH 2NO+2NC FOR S00 RING LUG Siemens
3RH2911-4GA31 AUX. SWITCH 3NO+1NC FOR S00 RING LUG Siemens
3RH2911-4GA40 AUX. SWITCH 4NO FOR S00 RING LUG Siemens
3RH2911-4HA01 AUX. SWITCH 1NC FOR S00 RING LUG Siemens
3RH2911-4HA02 AUX. SWITCH 2NC FOR S00 RING LUG Siemens
3RH2911-4HA03 AUX. SWITCH 3NC FOR S00 RING LUG Siemens
3RH2911-4HA10 AUX. SWITCH 1NO FOR S0 RING LUG Siemens
3RH2911-4HA11 AUX. SWITCH 1NO+1NC S00 & S0 RING LUG Siemens
3RH2911-4HA12 AUX. SWITCH 1NO+2NC S00 & S0 RING LUG Siemens
3RH2911-4HA13 AUX. SWITCH 1NO+3NC FOR S00 RING LUG Siemens
3RH2911-4HA20 AUX. SWITCH 2NO FOR S0 RING LUG Siemens
3RH2911-4HA21 AUX. SWITCH 2NO+1NC S00 & S0 RING LUG Siemens
3RH2911-4HA22 AUX. SWITCH 2NO+2NC S00 & S0 RING LUG Siemens
3RH2911-4HA30 AUX. SWITCH 3NO FOR S0 RING LUG Siemens
3RH2911-4HA31 AUX. SWITCH 3NO+1NC FOR S00 RING LUG Siemens