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问题请教:
2 N4 N3 e3 l5 D7 ^) @: g$ f/ N% c" G# v如题目:0 |# V! E. f1 ^/ g2 n. C
加拿大C22.2 no.77-95 Motors with Inherent Overheating Protection8 b5 {: V k+ J
如下测试要求 O |* B$ d" z/ E0 y; f
5.6.6 Motors with Thermal Cutoffs
5 k. y( \0 O5 n4 s2 p/ UMotors with thermal cutoffs shall be subjected to an endurance test of 18 d, with the winding9 ^1 `& z. Z5 I3 f+ p
at the maximum temperature that the protector will allow (see Clause 5.4.1) plus the total
$ Y! `, j: |0 C4 Z$ ^9 mprotector tolerance or, if the manufacturer requests, at a lower temperature, but in no case
% ]' J! }5 g/ Q4 w. Lless than 150°C if Class A or 175°C if Class B, F, or H insulation. The temperature shall be: j/ d9 ]' X9 F X4 c
obtained under locked-rotor conditions by adjusting the applied voltage or the ambient
) L( w7 Q- t+ l% I4 M+ G* Q# Rtemperature. During this test, the protector shall be disconnected from the circuit.; r: S. y0 Q- N) P- O9 Q- o5 o
( n- s3 [6 G5 t5 _" ^$ L
目前电机上温度保护器动作温度为120度,电机绝缘等级为CLASS A0 S0 t7 j; ~) Y/ d3 X& p
0 w! D* W/ f* u/ g- x& u问题:那这个测试过程中,通过调电压的方式,
3 g. E" d7 X6 t! ?9 P* x使电机线圈的温度保持在120度还是150度???
7 L- b/ }0 l! D2 v+ B4 ~' n2 ?- Y0 t1 D" b
谢谢 |
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发表于 2011-11-4 12:30
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