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Central Heating & Storage Heaters Forum
Circulating Pump Motors Power Factors
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<blockquote data-quote="John.G" data-source="post: 504150" data-attributes="member: 33351"><p>I have noticed recently that all the older type (induction motors?) have apparently very high power factors, these include Grundfos and Wilo and my old Salmson.</p><p></p><p>For example, take a Wilo ST circ pump (~ 11 years old) powering my solar system, the PFs for the 3 speeds, starting at the lowest are, by my calculations, respectively, 0.93, 0.88 &amp; 0.99. My A rated Wilo Yonos Pico CH circ pump motor ( a brushless DC Motor) gives a measured 0.53 which IMO is more to be expected but all the pump manufacturers were hardly posting incorrect numbers.</p><p> </p><p> The attachment is a bit hazy so the numbers are, 230V/0.20A/43W, 230V/0.3A/61W &amp; 230V/0.36A/82W which give the above calculated PFs of 0.93, 0.88 &amp; 0.99.</p><p></p><p>Can anyone give a possible explanation for this?</p></blockquote><p></p>
[QUOTE="John.G, post: 504150, member: 33351"] I have noticed recently that all the older type (induction motors?) have apparently very high power factors, these include Grundfos and Wilo and my old Salmson. For example, take a Wilo ST circ pump (~ 11 years old) powering my solar system, the PFs for the 3 speeds, starting at the lowest are, by my calculations, respectively, 0.93, 0.88 & 0.99. My A rated Wilo Yonos Pico CH circ pump motor ( a brushless DC Motor) gives a measured 0.53 which IMO is more to be expected but all the pump manufacturers were hardly posting incorrect numbers. The attachment is a bit hazy so the numbers are, 230V/0.20A/43W, 230V/0.3A/61W & 230V/0.36A/82W which give the above calculated PFs of 0.93, 0.88 & 0.99. Can anyone give a possible explanation for this? [/QUOTE]
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