标题: 针对AC风扇的一些疑问 [打印本页] 作者: zhuzifei 时间: 2011-4-13 09:21 标题: 针对AC风扇的一些疑问 现有一信息产品，上面有一AC风扇，风扇电压是220-240Vac，此产品出口欧洲，根据标准要求对于AC风扇需要满足附录B（风扇有UL认证，但是认证标准时UL 507），那么根据附录B的要求我只要满足风扇在堵转情况下温度不超过4.5.3的异常测试温度限制值就不用考虑其他测试这样理解不知道是否OK？是不是这样的话就不用堵转15天了。( E* |$ B# H S( |/ A: `# d
我个人理解是只要他堵转的温度不超过异常温度限制值，就不用去堵转15天。作者: 极品老工 时间: 2011-4-13 11:00
那看是什么保护类型的元件。见B5。作者: 阿bin 时间: 2011-4-13 20:42
交流风扇必须满足附录B中的B4（过载运转试验）和B5（堵转试验）要求。除非以下情况，可以不用做B4试验：! _# M( g5 |1 ~6 q% J/ u' N- R6 _+ T/ Y
– motors that are used for air-handling only and where the air propelling component is+ w5 L9 r2 y6 A
directly coupled to the motor shaft; and 0 |: [# r3 C+ y+ `( o* m# @
– shaded pole motors whose values of locked-rotor current and no-load current do not differ q- z' Y" x1 h9 I9 v9 _% S
by more than 1 A and have a ratio of not more than 2/1. 3 R6 Z3 {9 o0 N0 ?
1 m2 @/ Z/ M. k! Z' y3 K对于温升限制，标准要求B4试验和B5试验电动机绕组分别不超过表格B2和B1的要求。而堵转的试验时间是根据电动机的保护方式来选择的： % }7 S. f) L& y, b% U* }$ T– a motor protected by inherent or external impedance is operated with its rotor locked for 5 E k: W8 T! y6 D3 B% b$ ?' n8 ^
15 days except that testing may be discontinued when the windings of the motor, of either ! X6 F. c9 c; v) E& | U$ xthe open or totally enclosed type, reach a constant temperature, provided that the 1 K6 H* V* J, H8 }( f' {( V3 Econstant temperature is not more than that specified in 4.5.3, Table 4B for the insulation 5 E Y6 S1 V: o* B2 qsystem used; ( O6 y; C' A, `! m% Y5 p* _2 u– a motor with an automatic reset protection device is cycled with its rotor locked for 7 \6 W. K- h1 O1 q# ?3 \
18 days; , W$ {4 s+ D) e
– a motor with a manual reset protection device is cycled with its rotor locked for 60 cycles, 6 D$ W" y3 `8 h M- ~9 V, S4 Dthe protection device being reset after each operation as soon as possible for it to remain ) z8 y7 o) i7 f) C" x0 p! rclosed, but after not less than 30 s; # {0 D+ W3 I- }- V2 p% t– a motor with a non-resettable protection device is operated with its rotor locked until the 2 } s Q0 ^' T* sdevice operates.6 b; k4 g) p$ t
% r' D. m0 H8 h& ?' Y; D0 r# E
对于情况一，若固有阻抗或外部阻抗保护的电动机需要堵转方式工作15d，但对开启式或全封闭式的$ K: v2 x& b/ T z9 Z% m: s
电动机，当其绕组温度达到稳定时，就所采用的绝缘结构而言，如果该电动机的稳定温' L* C$ O d+ Q! C$ s* v
度不大于4.5.3的表4B规定的温度，则试验可以结束 4 W& h$ w$ c# [% @6 K& g& N 1 ~% f) f/ c0 a; a7 y% ?一切都还需要LZ对电动机的保护方式进行判断先作者: zhuzifei 时间: 2011-4-15 10:13
谢谢各位大侠的讲解作者: hdf590 时间: 2011-4-23 12:43
AC风扇，很少接触，要仔细看了。