Load Angle of Synchronous Motor at No Load

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Discussion Overview

The discussion revolves around the load angle of a synchronous motor when it is operating at no load. Participants explore the implications of load on the load angle, considering both theoretical and conceptual aspects of synchronous motor operation.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants propose that the load angle at no load could be zero degrees, suggesting that the rotor's magnetic field aligns with the stator's magnetic field.
  • Others express uncertainty, questioning whether it is appropriate to refer to it as a "load angle" in the absence of load.
  • One participant mentions that active power is proportional to the sine of the load angle, implying that with no load, the load angle would be zero.
  • A later reply clarifies that while the rotor and stator magnetic fields are aligned, it may not be accurate to equate this alignment directly with the concept of load angle.

Areas of Agreement / Disagreement

Participants generally express uncertainty regarding the load angle at no load, with multiple competing views on whether it can be considered zero degrees or if the terminology is appropriate in this context.

Contextual Notes

There are unresolved assumptions regarding the definitions of load angle and the conditions under which it is measured, as well as the implications of magnetic field alignment.

rob1985
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hi all,

Just a quick question, what would the load angle be of a synchronous motor when running at no load. would it be 0 degrees or 45 degrees
 
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What do you think and why?
 
to be honest I am really not sure, I suspect it is zero as there is no load so the magnetic field of the rotor is the same as the stator. am I on the right tracks
 
I agree w/ you, although I'm not sure I'd call it a "load angle" since there's no load :smile:
 
rob1985 said:
to be honest I am really not sure, I suspect it is zero as there is no load so the magnetic field of the rotor is the same as the stator. am I on the right tracks
Yes. Active power is proportional to the sine of the load angle. No load, no active power, hence zero load angle.
rob1985 said:
so the magnetic field of the rotor is the same as the stator
No. You can say rotor magnetic field and stator magnetic field are aligned, or in other words, rotor is aligned with the resultant magnetic field.
 
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