CE4006P2全新现货

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 三相异步电动机转速公式为：n=60f/p(1-s)
    f代表电源频率
    P为极对数
    n'代表转差率
    s代表转差率
    三相异步电动机转速是分级的，是由电机的“极数”决定的。　　
    三相异步电动机“极数”是指定子磁场磁极的个数。定子绕组的连接方式不同，可形成定子磁场的不同极数。选择电动机的极数是由负荷需要的转速来确定的。电动机的电流只跟电动机的电压、功率有关系。
    三相交流电机每组线圈都会产生N、S磁极，每个电机每相含有的磁极个数就是极数。由于磁极是成对出现的，所以电机有2、4、6、8……极之分。
    在中国，电源频率为50赫，所以二极电机的同步转速为3000转/分，四极电机的同步转速为1500转/分，以此类推。异步电机转子的转速总是低于或高于其旋转磁场的转速，异步之名由此而来。异步电机转子转速与旋转磁场转速之差（称为转差）通常在10%以内。
    因为如此，所以三相异步电动机的实际转速会比上述的同步转速偏低。如6的同步转速为1000转，其实际转速一般为960转/分钟。

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Cisco 7206 VXR Router P/N 47-2953-01 REV G0

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Cisco 3640 Series 1FE2W,Serial 4T,PRI 1CE1B

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Cisco 3640 series P/N 47-5582-01 REV AO 2FE2W(x2)

Cisco 3640 P/N 47-5582-05 REV AO 1FE1R2W, 1E2W

Cisco 3640 Series 1FE1R2W,Serial 4T,BRI 4B-S/T,2FE2W

Cisco 3640 series 1FE1R2W, Serial 4T, BRI 4B-S/T, 2FE2W

Cisco Systems SRW2024P-EU Gigabit Switch 24port

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CISCO 836 ADSL ISDN BROADBAND ROUTER CISCO836-K9

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Cisco 801-805 IP/Firewall Plus CD08-CHL-12.0.7 NEW

Cisco 2651 Router + Serial 4T + 1FE 2W W1 + PRI 1CE1B +

Cisco 1712 VPN/9 

CISCO Lightstream 1010 - LS1010

CISCO VCO 4K Series - Open Programmable SWITCH

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Cisco ISDN BRI RJ45 Network Cables Orange CAB-S/T-RJ45

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CISCO Catalyst 5505 Series - WS-C5505

CISCO Catalyst 3900 Series - WS-C3900

CISCO Catalyst 5000 - WS-C5000 Series

Cisco 1841 - 128D/64F - WIC-1T

CISCO Catalyst WS-C6500 Series loaded - WS-X6K-SUP2-2GE

Cisco Secure PIX 525 Series FireWall 47-4827-03 

CISCO Catalyst 5500 Series

CISCO 1801/K9 ISR ADSL

Cisco 3640 Router + Serial 4T + 1FE 2W W1 + PRI 1CE1B +

CISCO ASA 5510 SECURITY PLUS LICENCE

cisco secure PIX-535

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CISCO CATALYST 2960 48 10/100 BT PORTS WS-C2960-48TC-L

CISCO Catalyst 2960 G-24 TC-L Switch G-24TC-L