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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：
! z# V8 S: e* E2 V- N( G* x( m– motors that are used for air-handling only and where the air propelling component is
; s) E- e2 D& P& [) M/ c) Udirectly coupled to the motor shaft; and
8 P7 j' ^1 p7 V- |" B+ I! t9 G– shaded pole motors whose values of locked-rotor current and no-load current do not differ" t: h: b3 ~ _( y) c
by more than 1 A and have a ratio of not more than 2/1.
7 ]4 h0 C' Z/ K) o( m8 s5 R: p: f: T! s) r$ q$ R7 Z
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：
) Q4 y0 @" I" V! c! B& b8 m; I– a motor protected by inherent or external impedance is operated with its rotor locked for ; x$ ?, }$ z) t
15 days except that testing may be discontinued when the windings of the motor, of either ! q) R0 G( U9 t: B/ d
the open or totally enclosed type, reach a constant temperature, provided that the
( W- k2 _! M% e/ b/ x/ tconstant temperature is not more than that specified in 4.5.3, Table 4B for the insulation
7 }4 z& T& [. @% h% U b& [system used;
) D9 o# V0 ~, S– a motor with an automatic reset protection device is cycled with its rotor locked for 6 }; l9 M% P8 h Q" i5 t$ |
18 days;
1 t; a2 P; g1 w- r: R6 O– a motor with a manual reset protection device is cycled with its rotor locked for 60 cycles,
- w3 S. }8 f3 ^# M4 |% ythe protection device being reset after each operation as soon as possible for it to remain
& G# L1 U1 U+ ^8 W0 y4 N8 Z& Qclosed, but after not less than 30 s;
2 y% Z7 ~" E& o" i7 Q: `( _– a motor with a non-resettable protection device is operated with its rotor locked until the
+ w R% T- R7 }6 adevice operates.
5 q2 g. q0 X5 w6 X Q% d" u
( J- k; d: c; P/ [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
% y L' ]# _5 P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8 W# O3 l+ J. N
度不大于4.5.3的表4B规定的温度，则试验可以结束
6 U4 z9 ?6 u" `4 Z. H$ o. q2 R! _1 X' _: `
一切都还需要LZ对电动机的保护方式进行判断先 |
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