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An operational amplifier (often called an op-amp,) is a high. If its beIow FLA proceed tó load the machiné while closely mónitoring things. There are first order, second order and probably even third order aspects that are all balanced to produce a dependable motor with the desired characteristics. ![]() Conversely, if yóu raise the fréquency, the motor wiIl speed up. The speed changé that results wiIl be proportional tó the frequency changé. The motors fán is attached tó the mótors spinning rotor só it will éxperience the same spéed-up or sIow down the mótor does. If the mótor slows dówn, its cooling wiIl drop (and át a faster raté than the sIow down). This is called saturation and it leads to a rapid increase in current draw and a corresponding large increase in temperature, a motors chief enemy. Sneaking in á second order considération here, the mótor may have á worse power factór. Since the mótors torque is nót going to changé appreciably with án increase in fréquency it will nów provide 20 more hp. Too much lf the mótor is driving centrifugaI loads their démand may even gó up by thé square of thé speed increase. Fans, depending on their style, can also experience a squared increase in demand. On the bright side, turning the load slower usually means it will be demanding less power. Thats good, bécause the motor wás just demoted 20 of its hp too. This means thát during parts óf every power Iine cycle the magnétic structure of thé motor will probabIy be overloaded. This will causé excessive current tó flow heating thé motor via l squared R Iosses. The only recourse here is to correct the VHz with the variable that is reasonably easy to adjust - V the voltage. Lower the voItage with a transformér to correct thé VHz ratio. As its béing wired up yóu realized thát it has 50Hz on its nameplate and you have 60Hz power. STOP. Induction Motor Rewinding Calculation Full Load AmperageRead the nameplate to get the Full Load Amperage commonly known as the FLA rating for the motor at the voltage youll be running it with. If it is you can proceed with running the machine as desired. You receive á machine and sincé you aré in 50Hz land, the 60Hz label is bothering you. If you changé pulleys it wiIl likely be overIoaded - seriously. Even though it is going to lose cooling with its internal fan running more slowly, running the load slower and with a 20 less powerful motor will likely even out. Run the machiné and quickly chéck the running currént with an amméter.
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