Comparison of stator flux linkage estimators for PWM-based direct torque controlled PMSM drives

Shinohara, Atsushi; Inoue, Yoshio; Morimoto, Shigeo; Sanada, Masayuki

doi:10.1109/peds.2015.7203461

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…To resolve such problem, phase correction based on steady-state characteristics of quasi-integrators was proposed [5,8], but the estimated motor speed is employed, and it is clear that the phase correction performance is insufficient under transient conditions. This was also pointed out in a study that compared various correction methods [9].…”

Section: Introductionmentioning

confidence: 63%

PMSM Sensorless Control Based on Position Estimation Correction Using All‐Pass Filters

Tanaka

Hasegawa

Matsumoto

2017

Electrical Engineering Japan

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SUMMARY This paper proposes a novel flux estimation method for the position sensorless control of permanent magnet synchronous motors (PMSMs). In general, the stator flux linkage for position estimation in PMSMs is obtained using the pure integration of voltages. The infinite dc gain of the pure‐integrator, however, causes numerical drifts in the obtained stator flux linkage due to the dc offset in the input of this integrator. To address this problem, a quasi‐integrator is often substituted instead of the pure integrator to restrict the dc gain, leading to another problem in which the phase characteristics vary according to the operating frequency. As a result, the ideal phase characteristics (−90° constant) cannot be held, and the position estimation performance deteriorates. Therefore, this paper proposes a phase characteristic correction method for quasi‐integrators using all‐pass filters, which achieves extremely precise estimation under transient conditions as well as in steady state.

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Section: Introductionmentioning

confidence: 63%

PMSM Sensorless Control Based on Position Estimation Correction Using All‐Pass Filters

Tanaka

Hasegawa

Matsumoto

2017

Electrical Engineering Japan

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“…Tables 2 and 3 show the parameters of the IPMSM and DTC in the simulation. The q-axis inductance of the IPMSM is given by (14), whereas a constant L q is used in the DTC system. In this paper, the cutoff frequency of the flux estimator is 20 rad/s, which is sufficiently smaller than the operating frequency.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…In DTC, the stator flux linkage vector is estimated with an integrator based on (1). However, pure integrators have problems, such as the saturation of the integrator and the initial conditions (12) (14) . Thus, in this paper, a low-pass filter is applied as the integrator, as shown in Fig.…”

Section: Direct Torque Control Systemmentioning

confidence: 99%

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Correction Method of Reference Flux for Maximum Torque per Ampere Control in Direct-Torque-Controlled IPMSM Drives

et al. 2017

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In this paper, a maximum torque per ampere (MTPA) control strategy for direct-torque-controlled interior permanent magnet synchronous motor (IPMSM) drives is proposed. For current-controlled IPMSM drives, many methods have been proposed, in which the periodic signals are injected into reference current vectors. On the other hand, the direct-torque-controlled IPMSM drives require the torque and stator flux linkage magnitude as their references. The proposed method injects signals into the reference flux in a manner similar to that used for the signal injections in current-controlled IPMSM drives. The main feature of the proposed method is the ability to search the optimal current directly and successively using a local search algorithm. Therefore, variations in the parameters can be considered. The simulation and experimental results validate the proposed method.

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“…12 to avoid variations of flux estimation error according to rotor speed or voltage frequency because the pure integrator based on (17) cannot be realized practically and the improved flux linkage estimators have dependency on the speed or on the voltage frequency [21], [23], [24], which are sensitive to the voltage offset errors.…”

Section: A Tested Systemmentioning

confidence: 99%

Direct Calculation Method of Reference Flux Linkage for Maximum Torque per Ampere Control in DTC-Based IPMSM Drives

Shinohara

Inoue

Morimoto

et al. 2017

IEEE Trans. Power Electron.

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This paper proposes a maximum torque per ampere control strategy for direct-torque-controlled interior permanent magnet synchronous motor drives. The proposed method is based on the solutions of a quartic equation, a motor model in the d-q rotating frame often used for the synchronous motor controllers, and a well-known equation for maximum torque per ampere control. Therefore, the proposed method does not use a look-up table that depends on parameters of the motor and that has to be created in advance. In addition, the proposed method can use the estimated parameters. Particularly, the variations of the d-and q-axis inductances can be estimated when the inductances are modeled as the functions of the d-and q-axis current. The simulation results validate that the proposed method can achieve the maximum torque per ampere control. In addition, the simulation and experimental results verify the accuracy improvement of the maximum torque per ampere control with the iterated calculation.

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Comparison of stator flux linkage estimators for PWM-based direct torque controlled PMSM drives

Cited by 13 publications

References 19 publications

PMSM Sensorless Control Based on Position Estimation Correction Using All‐Pass Filters

PMSM Sensorless Control Based on Position Estimation Correction Using All‐Pass Filters

Correction Method of Reference Flux for Maximum Torque per Ampere Control in Direct-Torque-Controlled IPMSM Drives

Direct Calculation Method of Reference Flux Linkage for Maximum Torque per Ampere Control in DTC-Based IPMSM Drives

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