Current measurements in digitally controlled AC drives

Song, Seung-Ho; Choi, Jong-Woo; Sul, Seung-Ki

doi:10.1109/2943.847916

Cited by 80 publications

(6 citation statements)

References 11 publications

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“…The first challenge is inability to sample the average value of the phase current. In the conventional SVPWM switching method, sampling the phase current at the midpoint of the zero vector allows sampling the average current value [7]. However, as shown in Fig.…”

Section: Conventional Single Current Sensor Technologiesmentioning

confidence: 99%

“…When applying the offset voltage in (7), with the SSSPWM-2 and SSSPWM-3 methods, the time available for sampling the average current value can be extended, as shown in Fig. 10.…”

Section: B Offset Voltage Compensation For Extending Current Reconstr...mentioning

confidence: 99%

“…10. Adding the offset voltage reference from (7) to the phase voltage references, the condition for current measurement becomes as shown in (9).…”

Section: B Offset Voltage Compensation For Extending Current Reconstr...mentioning

confidence: 99%

“…3) where no phase current can be measured at all. In addition, when employing the Space Vector PWM (SVPWM) method for switching, there exists current reconstruction error due to the timing of current sampling [7]. To overcome such issues, techniques for reconstruction phase current using SCS have been studied through various methods.…”

Section: Introductionmentioning

confidence: 99%

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Sensor-Less Drive of Ultra-Low Inductance SPMSM With DC-Link Single Current Sensor

Hwang,

Chae,

Choi

2024

IEEE Access

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This article presents a single current sensing method that achieves minimal current reconstruction errors, even at extremely low-speed region. In vector control applications, a drive system that combines single current sensor with position sensorless techniques is attractive as it minimizes the use of sensors. The current reconstruction method using the DC current measurement method introduces current reconstruction errors because of the sampling timing of single current sensor method. Moreover, current dc current measurement method has a dead zone where current reconstruction is not possible, leading to pronounced current ripple during the avoidance process. In the case of ultra-low inductance motors, the increase in current ripple exacerbates the drive performance, especially at low speeds. When the single current sensor method and sensorless drive are applied to an ultra-low inductance non-salient pole synchronous motor, it can lead to operational failures due to high current ripple and current reconstruction errors at low-speed region. This article proposes a technique to improve the performance in the low-speed region when current reconstruction method using dc current sensor and sensorless techniques are used together by eliminating dead zone in the low-speed region minimizing current reconstruction errors with a model-free method. The current reconstruction performance, sensorless startup, and operation performance have verified through experiments.

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Section: Conventional Single Current Sensor Technologiesmentioning

confidence: 99%

“…When applying the offset voltage in (7), with the SSSPWM-2 and SSSPWM-3 methods, the time available for sampling the average current value can be extended, as shown in Fig. 10.…”

Section: B Offset Voltage Compensation For Extending Current Reconstr...mentioning

confidence: 99%

“…10. Adding the offset voltage reference from (7) to the phase voltage references, the condition for current measurement becomes as shown in (9).…”

Section: B Offset Voltage Compensation For Extending Current Reconstr...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensor-Less Drive of Ultra-Low Inductance SPMSM With DC-Link Single Current Sensor

Hwang,

Chae,

Choi

2024

IEEE Access

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“…But it 978-1-4244-4607-0/09/$25.00 ©2009 IEEE 66 should be noted that instantaneously sampled value contain errors caused by time delay of signal-conditioning circuit, and averaged sampling requires additional hardware and results in one step delay. If the transmission characteristic of signalconditioning circuit is known, delay sampling method can be used to compensate the delay of the circuit [4]. In full digital implementation of PMSM drive system, arithmetic calculation and pulse-width modulation (PWM) scheme inevitably lead to asynchronous accessing of motor position and phase current.…”

Section: Introductionmentioning

confidence: 99%

An online calibrating method for middle value of current measurement circuit in permanent magnet synchronous motor drives

Qin

Wang

Wei

et al. 2009

2009 Asia-Pacific Conference on Computational Intelligence and Industrial Applications (PACIIA)

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The measured d/q current signals of vector controlled PMSM in synchronous rotational frame often contain various kinds of noises, which is the main reason for the degradation of a high performance PMSM drive system. In this paper, we investigate a special kind of noise, which has the same frequency with motor's phase current, and come to the conclusion that this noise is induced by the middle value inaccuracy of current measurement circuit. To solve this problem, an online calibrating algorithm based on finite state machine is proposed, which can tightly track the middle value of current measurement circuit, and correct the corresponding parameters used in current sam piing and calculating algorithm in time. The calibrating algorithm is calculated incrementally, and therefore it is less time-consuming and suitable for microcontroller. The proposed technique is implemented in a fixed-point DSP based vector controller for PMSM. Experimental results verify the feasibility and effectiveness of the proposed method.

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Practical Issues

Sul¹

2010

Control of Electric Machine Drive Systems

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Current measurements in digitally controlled AC drives

Cited by 80 publications

References 11 publications

Sensor-Less Drive of Ultra-Low Inductance SPMSM With DC-Link Single Current Sensor

Sensor-Less Drive of Ultra-Low Inductance SPMSM With DC-Link Single Current Sensor

An online calibrating method for middle value of current measurement circuit in permanent magnet synchronous motor drives

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