Yes, there is a much better method. It measures the average temperature
of the whole winding, rather than the temperature at a particular spot.
IEC 62368-1 incorrectly says that the thermocouple method measures the
average temperature. You will find it explained in Annex E of IEC
60950-1. Incredibly, both IEC 60065 and IEC 62368-1 refer to the
'resistance method' without either detailing it or providing a cross
reference. This is a serious omission.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-19 16:12, Scott Xe wrote:
I will be conducting the temp rise measurements on windings of AC motors for
electrical appliances such as washing machines, dishwashers, etc. It said the
thermal couple method is commonly adopted for safety assessment. I can
dismantle the windings and place the couples inside the windings using
cyanoacrylate adhesive. However it may change the original shape of windings
giving non representative measurement result. Is there any practically
acceptable solution?
Does the measurement result include the overshoot temperature after the power
is cut?
Thanks and regards,
Scott
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