Negative Voltage/Current Readings in Induction Generator: Causes & Solutions

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Discussion Overview

The discussion revolves around the issue of negative voltage and current readings observed in a small induction generator setup. Participants explore potential causes for these readings and seek solutions, focusing on the interpretation of sensor data and the configuration of the experimental setup.

Discussion Character

  • Homework-related
  • Debate/contested
  • Technical explanation

Main Points Raised

  • The original poster notes that their data-logger displays negative readings for voltage and current, while a multimeter shows positive readings, raising questions about the accuracy of the sensors or the setup.
  • One participant suggests exchanging the leads of the sensors to see if that resolves the discrepancy in readings.
  • Another participant requests clarification on the definitions and setup, questioning whether the device in use is indeed an induction generator or something resembling a different type of device, such as a loudspeaker voice coil.
  • The same participant also points out that the presence of negative readings might imply a DC measurement rather than AC, which is typically expected from an induction generator.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of the device or the cause of the negative readings. There are competing interpretations regarding the type of generator being used and the expected behavior of the voltage and current readings.

Contextual Notes

There are unresolved assumptions regarding the definitions of terms used in the discussion, such as "induction generator" and the nature of the readings (AC vs. DC). The clarity of the experimental setup is also questioned, which may affect the interpretation of the data.

Faraday123
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Homework Statement


I am taking the readings of voltage/current in a small induction generator; the readings are conveyed as negative on the voltage/current sensors on my data-logger, and positive on the multimeter in both areas. When the magnet passes through the coil, and power is generated, it continues to display the reading as negative in both areas on the data-logger.


Homework Equations


What might be the cause for this? And what might a solution be?


The Attempt at a Solution


I have tried to establish if the cause was the wrong placement of multimeter/voltage/current sensor probes, but it was no avail.
Thank you.



Homework Equations





The Attempt at a Solution

 
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Exchange the leads until they agree.
 


Moderator's note: thread moved to Electrical Engineering from the Engineering, Comp Sci, & Technology homework forum.
 


some definition of terms would be in order.

you have a clear mental picture of your steup
but your words do not paint a clear picture for an audience.

induction generator?
to me that means an induction motor being driven faster than synchronous speed.

magnet passes through coil?
to me that sounds like something different than an induction generator, more similar to a loudspeaker voicecoil. .

Positive and negative readings on current sensors?
to me that sounds like DC.
if i were using an induction generator i would expect power line frequency AC.

can you clarify what kind of device you are studying, and how you're going about it?
 

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