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Double-frequency PWM control scheme for BLDCM(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2009年03
Page:
389-392+397
Research Field:
Publishing date:

Info

Title:
Double-frequency PWM control scheme for BLDCM
Author(s):
YANG Ping-hua; LIAO Zhi-hui; LI Tie-cai
Keywords:
rectangular brushless DC motors double-frequency pulse width modulation control scheme current ripple
PACS:
TM361.2;TM368.1
DOI:
-
Abstract:
This paper proposes a type of double-frequency pulse width modulation(PWM) control scheme which is used to apply in the drive case of rectangular brushless DC motor(BLDCM) with little induction which is difficult to be well controlled with traditional PWM control scheme because the switch frequency is not high enough.The winding current waveform whose charge/discharge frequency is double to switch frequency can be improved with the proposed double-frequency PWM control scheme,because winding current ripple can be reduced with higher charge/discharge frequency of winding current.The operation principle of proposed scheme was analyzed,and was in applied to control a BLDCM with 125μH of winding inductor using XC886 as the main control chip.The experimental result indicated that the steady-state current ripple was smaller than 10% when the charge/discharge frequency was doubled,and the winding current was in proximity to ideal rectangular.The validity of relative analysis is demonstrated.

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Memo

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Last Update: 2009-07-09