ABSTRACT:
In
this paper, an incorporated control strategy of both commutation and conduction
torque ripples mitigation for brushless DC machine (BLDCM) with the sinusoidal
back electromotive force(EMF) is proposed to reduce the vibration and noise of
household appliances for higher comfortable capability. Based on the combined
torque ripple analysis with respect to the stator flux linkage trajectory, a
three-phase voltage vector injection (TVVI) method is designed and implemented
in the commutation interval to compensate the sharp dips of the stator _ux
trajectory for the mitigation of the commutation torque ripple, and duty cycle
of the injected voltage vector could be regulated automatically. Then, a simple
direct power control (DPC) method with TVVI in the PWM modulation is employed
as inner-loop for BLDCM to obtain the desired waveforms of currents with the
speci_c dc-link current sampling method, and the reduction of both conduction
and commutation torque ripples is achieved. The proposed incorporated control
strategy is validated through simulation experiment results, and the effect on
the torque ripples are compared with the traditional approaches.
KEYWORDS:
1. Incorporated
control strategy
2. Commutation
and conduction torque ripples mitigation
3. Direct
power control
4. Three-phase
voltage vector injection
5. Stator
flux trajectory
In
this manuscript, an incorporated control strategy of commutation and conduction
torque ripples mitigation for BLDCM with the sinusoidal back EMF in household
appliances is proposed. Unlike the conventional separated analysis of the
commutation and conduction torque ripples, a combined torque ripples analysis
depending on the stator flux linkage trajectory is introduced. A three-phase
voltage vector injection(TVVI) method is designed and implemented in the
commutation interval to compensate the sharp dips of the stator _ux trajectory
for the mitigation of the commutation torque ripple, then, a simple DPC is
employed as inner-loop with the specific dc-link current sampling method to
replace the traditional current-loop, and the desired waveforms of currents
could be obtained for the conduction torque ripple mitigation. Moreover, the
TVVI and DPC control schemes are combined together to achieve the torque
ripples of less than 0.1Nm, which is only 12.5% of that in the traditional
current-loop control method. From the results of the comparison tests, the proposed
method ensures a signicant reduction of the commutation and conduction torque
ripple for BLDCM with the low-cost property, and the effectiveness and
feasibility have been extended to the other PWM patterns and wide speed range.
Thus, BLDCM with the improved higher torque performance can also be applied to
the other applications, where, the cost and torque ripples are of great concern.
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