V / F constant control of induction motor with inverter

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Discussion Overview

The discussion revolves around the control of induction motors using inverters and converters, specifically focusing on the relationship between output voltages of these devices. Participants are exploring concepts related to voltage symbols, the nature of AC and DC voltages, and the design implications of inverter and converter outputs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants seek clarification on the meanings of the symbols V~ and A~, suggesting they refer to AC volts and AC current.
  • There is a question about why the output voltage of the converter is greater than that of the inverter, with some noting that the converter outputs DC voltage while the inverter outputs AC voltage.
  • One participant proposes that the output voltage of the converter serves as the supply voltage for the inverter, implying that output voltage cannot exceed input voltage.
  • Another participant challenges this notion, stating that with the right design, output voltage can be greater or less than input voltage, providing an example of an inverter converting 12 VDC to 115 VAC.
  • There is a reiteration of the question regarding the relationship between the supply voltage and the inverter's output voltage, with a suggestion that the supply voltage must be greater than the inverter's output voltage.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between the output voltages of converters and inverters, with no consensus reached on the reasons behind these relationships.

Contextual Notes

Participants have not fully resolved the assumptions regarding voltage relationships and the implications of design choices in converters and inverters.

MissP.25_5
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Hello. I have to do an experiment on this topic, but there are many things I don't know. First of all, can you tell me what do the symbols V~ and A~ mean?
 

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Can someone tell me why is the output voltage of the converter bigger than the output voltage of the inverter? The output voltage of the converter would be a DC voltage whereas the output voltage of the inverter would be an AC voltage.
 
MissP.25_5 said:
Hello. I have to do an experiment on this topic, but there are many things I don't know. First of all, can you tell me what do the symbols V~ and A~ mean?

AC volts and AC current.
 
MissP.25_5 said:
Can someone tell me why is the output voltage of the converter bigger than the output voltage of the inverter? The output voltage of the converter would be a DC voltage whereas the output voltage of the inverter would be an AC voltage.

Why shouldn't it be?
 
rude man said:
Why shouldn't it be?

Hmmm, I guess the reason is the output voltage of the converter is the supply voltage for the inverter and output voltage can never exceed the input voltage. But I am not sure if that's enough reason for that.
 
MissP.25_5 said:
output voltage can never exceed the input voltage. But I am not sure if that's enough reason for that.

?

You can get any output voltage > or < input voltage with the right design.

For example, I have an inverter sitting in my garage that converts 12 VDC from a car battery to 115V AC 60 Hz to drive my TV set etc. if there is a power outage in my house.
 
rude man said:
?

You can get any output voltage > or < input voltage with the right design.

For example, I have an inverter sitting in my garage that converts 12 VDC from a car battery to 115V AC 60 Hz to drive my TV set etc. if there is a power outage in my house.

But the supply voltage, which is the output voltage of the converter should be bigger than the output voltage of the inverter, right? That's my question and I am trying to find the reason for that. I just guess that it's because the output voltage can't exceed the voltage supply. I said input earlier, I meant to say supply.
 

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