Low-cost sensorless control of brushless DC motors with improved speed range

Su, Gui-Jia; McKeever, J.W.

doi:10.1109/tpel.2003.823174

Cited by 198 publications

(69 citation statements)

References 10 publications

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“…If the other PWM techniques are used such as H-PWM-L-ON [15], H-ON-L-PWM [16][17], PWM-ON [18][19], ON-PWM [20], PWM-ON-PWM [21], it is necessary to consider the sampling timing for obtaining the dc current. However, in these variety PWM techniques, the proposed estimation method can be simply implemented.…”

Section: Fig 7 Block Diagram Of the Proposed Capacitance Estimationmentioning

confidence: 99%

Capacitance Estimation Method of DC-Link Capacitors for BLDC Motor Drive Systems

Moon¹,

Kim²,

Park³

et al. 2016

Journal of Electrical Engineering and Technology

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-This paper proposes a capacitance estimation method of the dc-link capacitor for brushless DC motor (BLDCM) drive systems. In order to estimate the dc-link capacitance, the BLDCM is operated in quadrant-II or -IV among four-quadrant operation. Quadrant-II and -IV are called reverse braking and forward braking, respectively. During the braking operation of the BLDCM, the capacitor is charged by the phase current and then the voltage is increased during the braking operation time. The capacitor current and voltage can be obtained by using the phase current sensor of BLDCM and the dc-link voltage sensor. The capacitance and be easily obtained by the voltage equation of the capacitor. The proposed method guarantees the reliable and simple calculation of the dc-link capacitance without additional hardware system except several the sensors already installed for the motor control system. The effectiveness of the proposed method is verified through both the simulation and experimental results.

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Section: Fig 7 Block Diagram Of the Proposed Capacitance Estimationmentioning

confidence: 99%

Capacitance Estimation Method of DC-Link Capacitors for BLDC Motor Drive Systems

Moon¹,

Kim²,

Park³

et al. 2016

Journal of Electrical Engineering and Technology

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“…This technique has the advantage of not requiring an integration step in the estimation calculation, thus removing problems associated with drift and integral windup [18,19]. However, it does not rely on the motor parameters and an expensive position sensor.…”

Section: Optimal Switching Tablementioning

confidence: 99%

A Novel Space Vector modulation Scheme and Direct Torque Control for Four-switch BLDCM Using Flux Observer

Pan¹,

Wang²,

Su³

et al. 2015

Journal of Electrical Engineering and Technology

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-The main purpose of this paper is to describe a DTC (direct torque control) method for four-switch brushless dc motor (BLDCM) drive. In the method, a novel voltage space vector modulation scheme, an optimal switching table, and a flux observation method are proposed. Eight voltage vectors are summarized, which are selected to control BLDCM in SVPWM pattern, and an optimal switching table is proposed to improve the torque distortion caused by midpoint current of the split capacitors. Unlike conventional flux observers, this observer does not require speed adaptation and is not susceptible to speed estimation errors, especially, at low speed. Global asymptotic stability of the flux observer is guaranteed by the Lyapunov stability analysis. DC-offset effects are mitigated by introducing a PI component in the observer gains. This method alleviates the undesired current and torque distortion which is caused by uncontrollable phase. The correctness and feasibility of the method are proved by simulation and experimental results.

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“…This technique has the advantage of not requiring an integration step in the estimation calculation, which removes problems associated with drift and integral windup [22], [23]. However, it does not rely on the motor parameters and an expensive position sensor.…”

Section: Torque Ripple Suppression For Fstpi Bldcm Drivementioning

confidence: 99%

Torque Ripple Suppression Method for BLDCM Drive Based on Four-Switch Three-Phase Inverter

Pan¹,

Sun²,

Wang³

et al. 2015

Journal of Power Electronics

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A novel inverter fault-tolerant control scheme is proposed to drive brushless DC motor. A fault-tolerant inverter and its three fault-tolerant schemes (i.e., phase A fault-tolerant, phase B fault-tolerant, and phase C fault-tolerant) are analyzed. Eight voltage vectors are summarized and a voltage vector selection table is used in the control scheme to improve the midpoint current of the split capacitors. A stator flux observer is proposed. The observer can improve flux estimation, which does not require any speed adaptation mechanism and is immune to speed estimation error. Global stability of the flux observer is guaranteed by the Lyapunov stability analysis. A novel stator resistance estimator is incorporated into the sensorless drive to compensate for the effects of stator resistance variation. DC offset effects are mitigated by introducing an integral component in the observer gains. Finally, a control system based on the control scheme is established. Simulation and experiment results show that the method is correct and feasible.

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Low-cost sensorless control of brushless DC motors with improved speed range

Cited by 198 publications

References 10 publications

Capacitance Estimation Method of DC-Link Capacitors for BLDC Motor Drive Systems

Capacitance Estimation Method of DC-Link Capacitors for BLDC Motor Drive Systems

A Novel Space Vector modulation Scheme and Direct Torque Control for Four-switch BLDCM Using Flux Observer

Torque Ripple Suppression Method for BLDCM Drive Based on Four-Switch Three-Phase Inverter

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