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Does anyone know where I can get any of these inverter power supplies for use in Electrical/Electronic laboratory? 1. Power :1KVA Wave Type: pure sine wave or modified sine wave: Voltage Output:220V Frequency range: 5Khz to 1Mhz 2. Power :2KVA Wave Type: pure sine wave or modified sine wave...

I would have suggested you check your insulation resistance of Phase C on motor side and also on generator side. Compare your result to that of Phase A and B. Comparatively low insulation resistance will gradually show its effect as you increase load. But your phase over current trip on the...

Gross output power is the total electric power generated at the terminal of the electric generator. But not all of this power generated is transmitted to the grid. Some of the power are used for auxiliaries such as air conditioning, fans, pumps, lighting etc, all to keep the electric generator...

Hello Great Minds! 1. I need a quality AC power supply with a phase angle control. I bought an SCR power supply but the output is not good enough at all for my project. I get as much as 40V output when the SCR is not fired while applying a voltage of about 240V at the input. I need output of...

@LMF5000 So sorry about your experience in Europe. We have been used to this all our life in Africa. Adults and Children alike scream for joy when the power company supplies power suddenly. The normal is power outage. The abnormal is power availability. Perhaps, the situation in Europe will...

@NickParker, Deriving equivalent circuit of a motor arms you very well to appreciate motor performance, and why the performance is so. It may look a little bit complex, but it makes you very grounded and thorough in being able to analyze motor performance. And one thing with understanding from...

@Paramji, I expect the system the batteries are connected to, to automatically detect a low voltage battery condition and do a switch-over to the spare. I say this because of the presence of the spare you mentioned in the system. The spare is useless if the system cannot automatically switch...

Thank you very much EdStainless and Onatirec. Your posts have been very helpful. I appreciate this! I appreciate your time everyone. Kind Regards

@ electricpete Many thanks. Skewing of magnets and stator. "...a perfect skew can nearly eliminate cogging torque." Rotor magnet shifting angle. Some very good insight. @onatirec: Any reference literature to read up this assertion? "slotless stator and airgap winding is the best approach...

@Onatirec, Thanks for finding time to respond on this. I am actually referring to a clear mathematical formula that establishes a relationship between the variables I listed earlier. Increasing the airgap between the rotor and stator will reduce cogging but also the mmf. This is not an option...

Hello Everyone, I need information on how to design a PM generator and have the rotor turn freely, without too much cogging from the forces due to the strong neodymium magnet. I have several diverging information from my research and need to be sure of what I am doing. Generally, there seems...

Thanks Waros. I think I am good enough with your earlier inputs. More ideas came when I bounced ideas with many others. For the learning, I had to convert all the lengths of different materials to their equivalent length of another material. For example, the material with permeability of...

Thanks so much for this. I got to this point. But the challenge for me is that cores B and C have the same magnetic permeability ,but different from the permeability of core A. Lets say their permeability is x times that of A. So I am thinking we cannot add the lengths 5" and 1.43" together just...

I totally agree with you. Was thinking through my tropics lens. For regions with varying sunlight intensity, this indeed is a valid and required consideration. Thanks very much !

Yes, you can practically use a 24V MPPT solar panel to charge a 12V deep cycle battery, but why do that ? The inherent operating problem is that the solar panel voltage of 24V is pulled down to match the battery voltage of 12V. This in turn pulls the panel voltage away from its optimum...

Hello Maple2, I have done solar and inverter design and installation for more than 10years. Your design calculation are fairly much in order. You provided a 25% oversize battery during the worst sunlight weather condition. Corrections you need to make: 1. Choose the same voltage rating for...

Hello IvanNX, I am not sure there is a clear standard on this in preparing BOM. However, you want to be able to clearly identify every wire in the assembly different from others. You may provide an additional schedule that clearly provides this detail, if you think your BOM will be too...

Waros, this is not homework! This is part of one of my projects. You can of course make any assumptions you need to make. The point is about calculating inductance of a parallel magnetic circuit, when only one of the cores have a coil around it. I already worked out a number of solutions, but...

What is the inductance of the coil? I need to determine the current I, flowing through the coil. I=V/Z. Z is impedance of the coil. Assuming the resistance of the coil is negligible compared to its reactance. Then I=V/X. X=2*pi*f*L where pi=3.142, f=50Hz. thus I=V/(2*pi*f*L) Now, how do I...

Yeah you are right, But i will rather go with 80%.