Why is the rotor angle and speed multiplied by a gain of 4 in PMSM control?
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Esther Kang
am 27 Mär. 2024
Kommentiert: Esther Kang
am 28 Mär. 2024
I'm studying for PMSM control, so I refered to this upper link.
I can't understand that the rotor angle and speed from the PMSM block have a gain '4' at the feedback loop.
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Yash
am 27 Mär. 2024
Hi,
If you observe closely, the rotor speed was "wm" and after multiplication by 4, the speed is labelled as "we". Refer the figure below:
These "wm" and "we" are mechanical speed and electrical speed respectively.
The ratio electrical speed by mechanical speed in a PMSM is equal to the number of pole pairs.
By default, the number of pole pairs is 4 in Simulink PMSM. Refer to the documentation of the PMSM block for more details: Three-phase permanent magnet synchronous machine with sinusoidal or trapezoidal back electromotive force, or five-phase permanent magnet synchronous machine with sinusoidal back electromotive force - Simulink (mathworks.com)
Therefore, the mechanical speed is multiplied by 4 to get the electrical speed. Similar logic has been appiled for the Rotor angle as well.
Hope this helps!
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