An Estimation Method of Rotational Direction and Speed for Free-Running AC Machines Without Speed and Voltage Sensor

Iura, Hideaki; Ide, K.; Hanamoto, Tsuyoshi; Chen, Zhe

doi:10.1109/tia.2010.2091670

Cited by 28 publications

(8 citation statements)

References 2 publications

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“…The frequency of the torque ripple was twice the rotor speed. Moreover, when HF components were ignored, the measured torque was highly consistent with the values calculated using (18). Figure 13 presents the current responses when the back-EMF was decoupled and the initial controller voltage was set to zero.…”

Section: Resultssupporting

confidence: 66%

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A Restarting Strategy for Back-EMF-Based Sensorless Permanent Magnet Synchronous Machine Drive

You

Yang

2019

Energies

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Safely starting a spinning position sensorless controlled permanent magnet synchronous machine is difficult because the current controller does not include information regarding the motor position and speed for suppressing the back-electromotive force (EMF)-induced current. This paper presents a restarting strategy for back-EMF-based sensorless drives. In the proposed strategy, the existing back-EMF and position estimator are used and no additional algorithm or specific voltage vector injection is required. During the restarting period, the current controller is set to a particular state so that the back-EMF estimator can rapidly estimate motor voltage without using rotor position and speed. Then, this voltage is used to decouple the back-EMF of the motor in the current controller in order to suppress the induced current. After the back-EMF is decoupled from the current controller, sensorless control can be restored with the estimated position and speed. The experimental results indicated that the induced current can be suppressed within four to five sampling periods regardless of the spinning conditions. Because of the considerably short time delay, the motor drive can restart safely from various speeds and positions without causing overcurrent fault.

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Section: Resultssupporting

confidence: 66%

“…Several restarting strategies have been reported for PMSMs in recent years. Most of these strategies involve applying zero-voltage vector pulses intermittently in order to identify the initial rotor position and speed, as well as to mitigate the regeneration current [13][14][15][16][17][18]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

A Restarting Strategy for Back-EMF-Based Sensorless Permanent Magnet Synchronous Machine Drive

You

Yang

2019

Energies

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“…The blue line is the AC current term calculated by subtracting the DC-offset from the measured phase a current. The yellow line is the actual rotor position angle θact, and the purple line is the rotor angle θest estimated using (11) and (12) with the AC current terms of the three-phase currents. From (12), the range of the estimated rotor angle is from −π/2 to π/2 because the output of the arctangent function is divided by 2.…”

Section: Resultsmentioning

confidence: 99%

“…The yellow line is the actual rotor position angle θact, and the purple line is the rotor angle θest estimated using (11) and (12) with the AC current terms of the three-phase currents. From (12), the range of the estimated rotor angle is from −π/2 to π/2 because the output of the arctangent function is divided by 2. The estimated rotor angle has a significant error in comparison with the actual rotor position.…”

Section: Resultsmentioning

confidence: 99%

A Rotating Restart Method for Scalar (v/f) Controlled Synchronous Reluctance Machine Drives Using a Single DC-Link Current Sensor

2020

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This paper presents a rotating restart method for v/f scalar controlled Synchronous Reluctance Machines (SynRMs) using a single DC-link current sensor. In such a case, the initial rotor position and speed are required to restart the machine due to the absence of a position sensor. The method proposes to inject three active voltage vectors in the stationary reference frame to induce the phase currents required for estimating the rotor position and speed. In addition, the phase current reconstruction method is proposed to reduce the distortion of the measured phase currents caused by adopting a single DC-link current sensor and to consequently enhance the rotor position estimation accuracy. With the proposed method, the appropriate voltage vector can be applied to the machine, thus minimizing the inrush current during the restart. Furthermore, the proposed method only requires the machine parameters on the nameplate, and it does not require any additional machine-specific tuning processes. This paper proposes a simple restart method suitable for scalar-controlled SynRM drives with a single DC-link current sensor. The effectiveness of the proposed restart scheme is validated through the simulation and experimental results.

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“…When a position/ speed sensor is not equipped, high inrush current may occur, due to large difference between the rotating frequency of the motor and output frequency of the inverter [28]. To start a free running motor without a speed sensor, some methods that investigate current or back electromotive force responses can be found in [28,29]. Some of these methods require proportional-integral (PI) controller to regulate stator current.…”

Section: Special Issue: Advances In Predictive Control Of Variable-spmentioning

confidence: 99%

Speed sensorless model predictive current control with ability to start a free running induction motor

Yang

Zhang

Walker

et al. 2017

IET Electric Power Applications

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In this study, a speed-sensorless finite control set-model predictive current control method is proposed based on an adaptive full order observer. The control system features simplicity and low cost because of no requirement for speed measurement, modulator and tuning of weighting factors. In most sensorless based schemes, the motor is assumed to be started from standstill. There is limited research considering starting a free running motor with unknown rotational direction and speed. To start a free-running induction motor (IM), the feedback gain matrix is designed to guarantee the convergence of estimated speed to actual speed even with incorrect initial value. To improve the efficiency, amplitude of flux is adjusted along with load condition. The presented results show that the proposed method is able to smoothly start an IM with unknown initial speed and work well over a wide speed range. The effectiveness of the proposed method is verified by both simulation and experimental tests on a two-level inverter fed IM drive platform.

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An Estimation Method of Rotational Direction and Speed for Free-Running AC Machines Without Speed and Voltage Sensor

Cited by 28 publications

References 2 publications

A Restarting Strategy for Back-EMF-Based Sensorless Permanent Magnet Synchronous Machine Drive

A Restarting Strategy for Back-EMF-Based Sensorless Permanent Magnet Synchronous Machine Drive

A Rotating Restart Method for Scalar (v/f) Controlled Synchronous Reluctance Machine Drives Using a Single DC-Link Current Sensor

Speed sensorless model predictive current control with ability to start a free running induction motor

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