Rectifier circuit for AC sources with 180˚ phase offset

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Discussion Overview

The discussion revolves around the rectification of output from a two-phase generator designed to power DC devices. Participants explore methods to rectify AC outputs that are 180° out of phase, including the arrangement and winding of coils.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about how to rectify the output from opposing coils in a two-phase generator.
  • Another participant suggests using two full-wave bridge rectifiers and connecting the DC outputs in parallel, indicating that opposite coils can sum voltages when connected correctly.
  • There is a clarification request regarding the meaning of "winding the coil backwards," with a focus on whether this involves winding opposing coils in opposite directions.
  • Participants discuss the implications of how coils are wound or connected, noting that voltages can add or subtract based on these configurations.
  • Questions are raised about the number of magnetic poles on the rotor, which may influence the output characteristics of the generator.
  • One participant asserts that the output of the windings will be in quadrature, suggesting a 90° phase relationship in the context of the generator's design.

Areas of Agreement / Disagreement

Participants express differing views on the specifics of coil winding and its impact on voltage output, indicating that multiple competing models and interpretations exist regarding the rectification process and generator design.

Contextual Notes

Some assumptions about the rotor's magnetic configuration and the specifics of coil winding are not fully detailed, leaving room for interpretation and further exploration of the topic.

Who May Find This Useful

Individuals interested in generator design, electrical engineering, and rectification methods may find this discussion relevant.

Manuel12
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In a simple 2-phase generator that I am making, I have 2 pairs of oppositely placed copper coils in arrangement similar to this:

Screenshot 2023-01-05 at 11.25.52.png


I would like the generator to power DC devices. My question is: How could one rectify the output from opposing coils? Or, in other words, how could you rectify 2 AC outputs with an 180˚ phase shift?
 
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I would expect the windings at 90° would have phase at 90°.
You need to show the rotor magnetic poles.

Opposite coils would have phase at 180°, so would be connected to sum the voltages.
For 180°, reverse the connections, or wind the coil backwards.
Use two full-wave bridge rectifiers, connect the DC outputs in parallel.
 
Baluncore said:
I would expect the windings at 90° would have phase at 90°.
You need to show the rotor magnetic poles.

Opposite coils would have phase at 180°, so would be connected to sum the voltages.
For 180°, reverse the connections, or wind the coil backwards.
Use two full-wave bridge rectifiers, connect the DC outputs in parallel.
By winding the coil backwards, do you mean winding opposing ones in opposite directions to each other? Just want to check.
 
Manuel12 said:
By winding the coil backwards, do you mean winding opposing ones in opposite directions to each other? Just want to check.
You are now aware that voltages can add or subtract, depending on how you wind or connect the coils.

How many North poles are there on the rotor?
How many South poles are there on the rotor?
 
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Baluncore said:
You are now aware that voltages can add or subtract, depending on how you wind or connect the coils.

How many North poles are there on the rotor?
How many South poles are there on the rotor?
One north pole on one half of the cylinder, one south pole on the other
 
Manuel12 said:
One north pole on one half of the cylinder, one south pole on the other
The output of the windings will be in quadrature, which means 90°.

You are building a two phase alternator with four wires going to the rectifiers.
TwoPoleTwoPhase.png
 
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