TSXCAY33

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2、选择步进电机还是伺服电机系统?

各有其特点，根据具体应用情况而定。

3、如何配用步进电机驱动器?

根据电机的电流，配用大于或等于此电流的驱动器。如果需要低振动，可配用细分型驱动器。对于大转矩电机，尽可能用高电压型驱动器，以获得良好的高速性能。

4、2相和5相步进电机有何区别如何选择?

2相电机成本低，但在低速时的震动较大，高速时的力矩下降快。5相电机则振动较小，高速性能好，比2相电机的速度高30~50%，可在部分场合取代伺服电机。

5、何时选用直流伺服系统，它和交流伺服有何区别?

直流伺服电机分为有刷和无刷电机。有刷电机成本低，结构简单，启动转矩大，调速范围宽，控制容易，需要维护，但维护方便(换碳刷)，产生电磁干扰，对环境有要求。因此它可以用于对成本敏感的普通工业和民用场合。

无刷电机体积小，重量轻，出力大，响应快，速度高，惯量小，转动平滑，力矩稳定。控制复杂，容易实现智能化，其电子换相方式灵活，可以方波换相或正弦波换相。电机免维护，效率很高，运行温度低，电磁辐射很小，长寿命，可用于各种环境。

交流伺服电机也是无刷电机，分为同步和异步电机，目前运动控制中一般都用同步电机，它的功率范围大，可以做到很大的功率。大惯量，高转动速度低，且随着功率增大而快速降低。因而适合做低速平稳运行的应用。

TSXCAY33 

NETAPP STORAGE SHELF DS14 MK2 - AT 7X 320GB DS14MK2

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NetApp X232A 72GB 10K BCS Disk for FC9 

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NetApp R200 Server NVRAM4 Card 256MB PCI-X 111-00023+C0

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NetApp Filer Shelf DS14 MK2 ESN2 FC Modules 144GB NEW!!

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NetApp X268A-R5 750G SATA Drive DS14MK2-AT 108-00149

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NetApp F840 w/ (14) 144GB 2TB Network Appliance NetApps

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Network Appliance Filer NetApp FAS250

NetApp X267A-R5 500G SATA Drive DS14MK2-AT 108-00088

NETWORK APPLIANCE NETAPP DS14MK2 AT, 14 X 750GB(X268A)

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