Minimum Current Start-Up Method by Combined Use of Two Position-Sensorless Controls

Suzuki, Takahiro; Shimizu, Yuichi; Iwaji, Yoshitaka; Takahata, Ryoichi; Aoyagi, Shigehisa

doi:10.1109/tia.2014.2385938

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…where Êdq_p (kT) are estimated EMF voltages with the parameter error, and Edq_Rerr (kT) and Edq_Lerr(kT) are additional components due to estimation errors from the resistance and inductance. Assuming the resistance and inductance estimation error are Δ Edq_Rerr(kT) and Edq_Lerr(kT) can be obtained from (14), which are shown in (22) and (23), respectively.…”

Section: Reduced Sensitivity On the Parameter Errormentioning

confidence: 99%

“…Edq_Rerr(kT) and Edq_Lerr(kT) can be obtained from (14), which are shown in (22) and (23), respectively.…”

Section: Reduced Sensitivity On the Parameter Errormentioning

confidence: 99%

“…Assuming the resistance and inductance estimation error are ∆R s = R s −R s and ∆L s = L s −L s , E dq − Rerr (kT) and E dq − Lerr (kT) can be obtained from (14), which are shown in (22) and (23), respectively.…”

Section: Of 17mentioning

confidence: 99%

“…It is noteworthy that both (22) and 23 21are calculated by adding E dq − Rerr (kT) and E dq − Lerr (kT). As shown in (a), the error of ∆R s results inω e dependent error on e d (kT), where the error increases asω e increases.…”

Section: Of 17mentioning

confidence: 99%

“…The overall EMF-based drive system is shown in Figure 1. Considering the EMF estimation algorithm denoted by the blue block, EMF voltage can be estimated from either the open-loop calculation based on the machine model [14,[21][22][23][24][25] or the closed-loop state estimation using observer technologies [26][27][28][29][30][31][32]. Open-loop methods directly calculate EMF voltage based on the machine model.…”

Section: Introductionmentioning

confidence: 99%

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Position and Speed Estimation of Permanent Magnet Machine Sensorless Drive at High Speed Using an Improved Phase-Locked Loop

et al. 2017

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In conventional position sensorless permanent magnet (PM) machine drives, the rotor position is obtained from the phase-locked loop (PLL) with the regulation of spatial signal in estimated back electromotive force (EMF) voltages. Due to the sinusoidal distribution of back-EMF voltages, a small-signal approximation is assumed in the PLL in order to estimate the position. That is, the estimated position is almost equal to the actual position per sample instant. However, at high speed when the ratio of sampling frequency, f sample , over the rotor operating frequency, f e , is low, this approximation might not be valid during the speed and load transient. To overcome this limitation, a position estimation is proposed specifically for the high-speed operation of a PM machine drive. A discrete-time EMF voltage estimator is developed to obtain the machine spatial signal. In addition, an arctangent calculation is cascaded to the PLL in order to remove this small-signal approximation for better sensorless drive performance. By using the discrete-time EMF estimation and modified PLL, the drive is able to maintain the speed closed-loop at 36 krpm with only 4.2 sampling points per electrical cycle on a PM machine, according to experimental results.

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Section: Reduced Sensitivity On the Parameter Errormentioning

confidence: 99%

“…Edq_Rerr(kT) and Edq_Lerr(kT) can be obtained from (14), which are shown in (22) and (23), respectively.…”

Section: Reduced Sensitivity On the Parameter Errormentioning

confidence: 99%