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I want to reduce complexity on buying many different parts and design different circuits. So I'm thinking if I can buy just FNB41560s that are well priced and simple and are capable of driving 3-phase AC motors, but using it also to drive 1- and 2-phase AC motors.

All the motors I will use are simple AC asynchronous ones that vary velocity by frequency. It’s an "inverter"(variable frequency inverter drives - VFD) type application to vary speed.

ocrdu
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bigubr
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1 Answers1

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As long as the specifications for the Intelligent Power Module (IPM) are appropriate for the voltages and currents required for the motors, I see no reason why they would not work for single phase motors (PSC types) as well as the intended three phase motors. Two phase motors are rare and would require a four element H-bridge. For the capacitor run motors, it would be best to remove the capacitor and drive that winding with the equivalent voltage and phase angle supplied by the capacitor, especially if you need to vary the speed more than 20% or so. Otherwise, the usual V/f algorithm will cause excessive current through the capacitor into the auxiliary winding at higher than base speed, and lower speeds would result in insufficient current to achieve rated torque.

PStechPaul
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  • Start run caps won't shift 90 deg at low V/f and you meant dual line single phase – Tony Stewart EE75 Aug 31 '22 at 02:17
  • I don't know what dual line single phase is. Two phase motors have two equal windings spaced at 90 degrees and require four power connections. https://www.tme.eu/en/news/library-articles/page/43518/three-phase-two-phase-and-single-phase-motors-how-they-are-built-what-they-are-used-for/ – PStechPaul Aug 31 '22 at 05:52
  • its only single phases and 3-ph , i will edit it . the 2-ph i said are actualy 220V monos so using in 127V L+L . – bigubr Sep 03 '22 at 01:53
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    about capacitors , any motor wired with it i will remove and drive it directly. i get what you mean, sometimes people wire 3-ph motors with only 2 phases and use a "starting capacitor" for the motor to accumulate that bit of extra energy for the motor to start. – bigubr Sep 03 '22 at 01:58