Calculating Load with Magnetometer for Synchronous Motor

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Discussion Overview

The discussion revolves around the use of a magnetometer sensor to calculate the load of synchronous motors. Participants explore the relationship between rotor angle, magnetic fields, and load calculations, as well as alternative methods for estimating load.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that the load of a synchronous motor is proportional to the angle between the rotor poles and the rotating magnetic field in the stator, which can be expressed as a phase difference.
  • One participant proposes using a compass needle mounted on the rotor to indicate the rotor angle, emphasizing the importance of direction over magnitude of the magnetic field.
  • Another participant questions whether an increase in load affects the magnetic field and requests assistance in formulating a load calculation equation.
  • Participants inquire about the mounting position of the magnetometer and its capability to measure direction.
  • A formula for power is proposed, where power is expressed as a function of the rotor angle, contingent on the measurement of that angle.
  • There is a discussion about whether the principles apply to synchronous servo motors, with some asserting that the principles are applicable to all synchronous motors but noting the engineering challenges involved in measuring the angle with a magnetometer.
  • Some participants suggest measuring voltage and current as alternative methods for estimating load, arguing that these methods are simpler than using a magnetic field sensor.
  • Questions are raised about the potential use of an accumulator sensor for detecting or calculating load, indicating interest in exploring different sensor technologies.

Areas of Agreement / Disagreement

Participants express differing views on the best methods for calculating load, with some advocating for the use of a magnetometer and others preferring voltage and current measurements. The discussion remains unresolved regarding the effectiveness and practicality of these approaches.

Contextual Notes

Participants highlight the engineering challenges associated with accurately measuring rotor angle with a magnetometer, and the discussion includes various assumptions about the applicability of different sensor types and methods.

Hala Helmi
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Looking for any insight on a formula that can be used to calculate the load using a magnetometer sensor for synchronous motor
 
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Synchronous motor load is proportional to the angle between the rotor poles and the rotating magnetic field in the stator. Angle can also be expressed as phase difference.

If you had a compass needle mounted on the outer perimeter of the rotor by at the pole, out would point in the direction of the rotor angle. So it it's the direction of that magnetic field, not the magnitude.
 
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Many thanks anorlunda,
Is the increase in the load will affect the magnetic field ?
if it is possible can you help me to write the formula
 
Last edited:
Where is your magnetometer mounted?
Can it measure direction?
 
If you can measure the rotor angle ##\theta##, the equation for power will then be ##P=P_{max}\sin\theta##.

Where ##P_{max}## is a constant dependent on the details of the grid and the load and the wiring and the voltages.
 
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anorlunda said:
Where is your magnetometer mounted?
Can it measure direction?
yes, it can measure the direction
 
anorlunda said:
Synchronous motor load is proportional to the angle between the rotor poles and the rotating magnetic field in the stator. Angle can also be expressed as phase difference.

If you had a compass needle mounted on the outer perimeter of the rotor by at the pole, out would point in the direction of the rotor angle. So it it's the direction of that magnetic field, not the magnitude.
Hi @anorlunda, I just want to check if I have a synchronous servo motor is this will make any difference
 
It applies to all kinds of synchronous motors.

But there is a lot of engineering needed to measure that angle with a magnetometer. But in principle it is possible.
 
But why not measure voltage and current to estimate load. Those are much easier to deal with IMO.
 
  • #10
DaveE said:
But why not measure voltage and current to estimate load. Those are much easier to deal with IMO.
Because I want to use a magnetic field sensor to get the load, I'm unable to determine the voltage or current in this case.
 
  • #11
I want to ask about If I have accumulator sensor can It be used to detect or determine and calculate the load
 

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