BLUE PETER Series Stator RTDs

Stator Winding (slot) RTDs

For Motor/Generator applications, it is generally accepted that Stator Winding RTDs offer significant ADVANTAGES over all other motor related temperature measurement methods.
For further discussion

BLUE PETER Series® stator winding RTDs offer additional
advantages over other stator RTD sensors. To understand these, 
one must ask:

                            Why do other brands of
                         Stator RTDs sometimes fail?

        • "Leadwire pullouts" from the stator RTD body...often after a motor has completed manufacture or rebuild. This is the result of an inadequate element wire/leadwire attachment assembly. BLUE PETER Series® stator winding RTDs incorporate a Flexible PCB which is the interface between the element wire/leadwire junction. Even when subjected to considerable tension, BLUE PETER Series® stator RTD leadwires can withstand abuse better than that of many other stator RTDs.

        • A second reason for Stator RTD failures is relatively modern phenomenon. It appreared with the widespread use of Variable Speed Drives. When an AC motor is improperly matched or installed with a VSD, power quality suffers. Waveform signals ranging from "less-than-perfect sine waves" to "high voltage" Corona related spikes are encountered. What makes some brands of stator RTDs particularly susceptible to failure relates to the design of their RTD element inside the stator RTD body. An element wire "zigzag pattern" is utilized... The result is a "tip", which is created with each change in element wire direction. These "tips" become an antennae-like voltage receptors. BLUE PETER Series® stator RTD elements use a patented technique to "lay down" element wire. Ultra thing Platinum, Nickel or Copper wire threads are "drawn" onto a substrate before being embedment into the stator epoxy body. The BLUE PETER Series® drawing patterns have no abrupt changes in direction. They are almost totally impervious to Corona or other sharp voltage transients.