Servo performance of a BLDC drive with instantaneous torque control

Low, T.S.; Tseng, K.J.; Lee, T.-H.; Lock, K.S.

doi:10.1109/ias.1990.152225

Cited by 28 publications

(7 citation statements)

References 6 publications

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“…The mature algorithms of current controller under conventional SSTP inverter can be easily transplanted into FSTP inverter to calculate the duty cycles of main vectors, so controller design is greatly simplified. In this paper, integral variable structure control (IVSC) principle with the advantages of high bandwidth and strong robustness against disturbance is used to calculate the duty cycles of main vectors so as to control the tracing of reference current by actual current and realise current closed‐loop control [19–21]. In addition, P controller is proposed to calculate the duty cycles of two adjusting vectors in each sub‐mode.…”

Section: Calculation Of Duty Cycles For Main Vectors and Adjusting mentioning

confidence: 99%

“…The detailed calculation of duty cycles for main vectors D 1 with IVSC, which is not the focus of this paper, is not given here because of the restriction of length, and can refer to [19–21] if necessary. The stability of the proposed TEV current control scheme is analysed by taking Mode I as an example, and D c is calculated further by using a P controller.…”

Section: Calculation Of Duty Cycles For Main Vectors and Adjusting mentioning

confidence: 99%

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Three effective vectors‐based current control scheme for four‐switch three‐phase trapezoidal brushless DC motor

Xia

Xiao

Chen

et al. 2013

IET Electric Power Applications

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This study presents a novel three effective vectors (TEV) current control scheme for four-switch three-phase inverter in cost-effective brushless DC motor drive with improved performance. This scheme overcomes the possible distortion of threephase currents caused by phase C back-EMF, and quasi-square current waveforms are attained by inserting two adjusting vectors in each control period based on the conventional switching modulation scheme. The duty cycles of the two adjusting vectors are further calculated using a simple P controller. Integral variable structure control principle with advantages of high bandwidth and strong robustness against external disturbance is used to control the tracing of reference current by actual currents. The stability of the proposed TEV current control scheme is demonstrated by selecting a candidate Lyapunov function, based on which the range of duty cycles of adjusting vectors are also determined. Experimental results verify that the proposed scheme is simple and can provide small current ripple, with good performance in speed.

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Section: Calculation Of Duty Cycles For Main Vectors and Adjusting mentioning

confidence: 99%

Section: Calculation Of Duty Cycles For Main Vectors and Adjusting mentioning

confidence: 99%

Three effective vectors‐based current control scheme for four‐switch three‐phase trapezoidal brushless DC motor

Xia

Xiao

Chen

et al. 2013

IET Electric Power Applications

View full text Add to dashboard Cite

show abstract

“…In torque control schemes, one popular way is to regulate torque by using online estimated torque based on electrical subsystem variables (currents and voltages) only. Various algorithms have been proposed for instantaneous torque estimation [7]- [10]. On the other hand, this approach can be used only for those torque ripple components that are observable from an electrical subsystem-ripples due to mechanical part (e.g., cogging torque and load oscillations) cannot reflect in electrical subsystem variables, and hence uncontrollable [6].…”

Section: Introductionmentioning

confidence: 99%

Speed Ripple Minimization in PM Synchronous Motor Using Iterative Learning Control

Qian

Panda

2005

IEEE Trans. On Energy Conversion

119

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Permanent-magnet synchronous motor (PMSM) drives are widely used for high-performance industrial servo applications where torque smoothness is an essential requirement. However, one disadvantage of PMSM is parasitic torque pulsations, which induce speed oscillation that deteriorates the drive performance particularly at low-speeds. To suppress these speed ripples, two iterative learning control (ILC) schemes implemented in time domain and frequency domain respectively are proposed in this paper. Although a conventional proportional-integral (PI) speed controller does suppress speed ripples to a certain extent, it is not adequate for many high performance applications. Thus, the proposed plug-in ILC controller is applied in conjunction with a PI speed controller to further reduce the periodic speed ripples. Experimental verification of the two schemes is carried out, and test results obtained demonstrate that the scheme implemented in frequency domain has better performance in reducing speed ripples than that implemented in time domain because of the elimination of forgetting factor that is indispensable for robustness in time domain learning method.

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“…In torque control schemes, one popular way is to regulate torque by using online estimated torque based on electrical subsystem variables only. Various algorithms have been proposed for instantaneous torque estimation [7]- [10]. On the other hand, this approach can be used only for those torque ripple components that are observable from electrical subsystem-ripple due to mechanical part (e.g., cogging torque and load oscillations) cannot be observed or controlled.…”

Section: Introductionmentioning

confidence: 99%

Review of torque ripple minimization in PM synchronous motor drives

Panda

Qian

2008

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century

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Parasitic torque pulsations exist in permanent magnet synchronous motors (PMSMs) due to non-sinusoidal flux density distribution around the air-gap, errors in current measurements, and variable magnetic reluctance of the air-gap due to stator slots. These torque pulsations vary periodically with rotor position and are reflected as speed ripple which degrades the PMSM drive performance, particularly at low speeds. Because of the periodic nature of torque ripple, iterative learning control (ILC) is intuitively an excellent choice for torque ripple minimization. In this paper, we provide a brief survey of the various approaches that have been proposed for torque ripple minimization. Subsequently, first we propose an ILC scheme implemented in time domain to reduce periodic torque pulsations. A forgetting factor is introduced in this scheme to increase the robustness of the algorithm against disturbance. However, this limits the extent to which torque pulsations can be suppressed. In order to overcome this limitation, a modified ILC scheme implemented in frequency domain by means of Fourier series expansion is presented. Experimental evaluations of both the proposed schemes are carried out on a DSP-controlled PMSM drive platform. Test results obtained demonstrate the effectiveness of the proposed control schemes in reducing torque ripple by a factor of approximately three under various operating conditions.

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Servo performance of a BLDC drive with instantaneous torque control

Cited by 28 publications

References 6 publications

Three effective vectors‐based current control scheme for four‐switch three‐phase trapezoidal brushless DC motor

Three effective vectors‐based current control scheme for four‐switch three‐phase trapezoidal brushless DC motor

Speed Ripple Minimization in PM Synchronous Motor Using Iterative Learning Control

Review of torque ripple minimization in PM synchronous motor drives

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