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  1. Ethnan

    Star delta

    Star connection is better for low loads. If your pump is below 5KW, then you have lower current in each line, and low starting torque required. A star connection will draw less current at start than a delta connection, and because this is a solar panel, your power is limited, so go star connection.
  2. Ethnan

    Fast switching SSR SPDT (Solid state Single-Pole-Double Throw) Relay

    Thank you. However the one on the link are for RF (microwave), max power handling is about 5W. I am looking for fast SPDTs that can handle minimum of 5KW of power. MOSFETS should be able to do very fast switching , like single channel dual output, with one output inverted. This is what I need...
  3. Ethnan

    Fast switching SSR SPDT (Solid state Single-Pole-Double Throw) Relay

    Thanks a lot Lionel. MOSFETS should be able to do very fast switching ,a module like a single channel dual output, with one output inverted. This is what I need. Where can I get this?
  4. Ethnan

    Fast switching SSR SPDT (Solid state Single-Pole-Double Throw) Relay

    Yeah I actually know. I am much better with designs and not implementation. Rather have someone else build my designs.
  5. Ethnan

    Fast switching SSR SPDT (Solid state Single-Pole-Double Throw) Relay

  6. Ethnan

    I feel like I wasted 2 years — advice from senior engineers appreciated

    Dear Hyde, Great advice from seniors here for you! With a B.sc, you are already ahead of many! Let nothing else stop you now, If nothing could stop you in school. Build skills, learn it, you may feel used...
  7. Ethnan

    Fast switching SSR SPDT (Solid state Single-Pole-Double Throw) Relay

    Good day Noble Minds, I need a fast switching SPDT relay(not less than 1Khz) to implement the circuit below. Both S1 switches will close to terminal 1, when both S2 switches close to terminal 2 and vice versa. Your recommendation of any available module in the market will be highly...
  8. Ethnan

    Motor Bearings Overheating at 60 Hz – Seeking Expert Advice

    Based on the motor spec- [3-phase induction motor (440V, 60 Hz, 62A, 42 kW, 3555 RPM)], at 50Hz, the motor speed would be 2,963RPM. The RPM is higher at 60Hz. As already suggested by others, you may need to do any of the following: 1. Ensure bearings are properly lubricated with the...
  9. Ethnan

    Variable High Frequency Power Supply

    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...
  10. Ethnan

    What possible root cause Phase C current spiked two time of Phase A & B current?

    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...
  11. Ethnan

    Hello everyone, please help me

    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...
  12. Ethnan

    QUALITY 230/240 50Hz AC supply with PHASE ANGLE CONTROL

    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...
  13. Ethnan

    Quieting generator for neighbors?

    @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...
  14. Ethnan

    Motor Starting Study

    @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...
  15. Ethnan

    In power plant when one battery ban

    @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...
  16. Ethnan

    PERMANENT MAGNET GENERATOR DESIGN-TO AVOID COGGING

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

    PERMANENT MAGNET GENERATOR DESIGN-TO AVOID COGGING

    @ 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...
  18. Ethnan

    PERMANENT MAGNET GENERATOR DESIGN-TO AVOID COGGING

    @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...
  19. Ethnan

    PERMANENT MAGNET GENERATOR DESIGN-TO AVOID COGGING

    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...
  20. Ethnan

    INDUCTANCE OF A 3-CORE TRANSFORMER

    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...

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