AN2372 datasheet(10/13 Pages) STMICROELECTRONICS

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AN2372 Datasheet(PDF) 10 Page - STMicroelectronics

Part #	AN2372

Description	Low cost sinusoidal control of BLDC motors with Hall sensors using ST7FMC

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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10 / 13 page

Phase current comparison between 6 step BLDC drive and sine BLDC drive for same power out-

10/13

Appendix A

Phase current comparison between 6 step

BLDC drive and sine BLDC drive for same

power output

For same power output, average DC link current is same

6 Step BLDC motor phase currents:

Iav = 2. Id /3

Irms(BLDC) = sqrt(2/3).Id

= 0.8165 . Id

Sine-drive motor phase currents:

Iav= 2. Im / π

Where,

Im = (π/3). Id → under same power delivery

Irms(SINE)= [π / (3.sqrt(2))] . Id

= 0.74 . Id

Irms(SINE) / Irms(BLDC) = 0.906

This shows that with a sine-drive BLDC approach, the phase rms current is lower by nearly

10% compared to a 6 step drive.

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