A Smooth and Stable Open-Loop I-F Control for a Surface Mount PMSM Drive by Ensuring Controlled Starting Torque

Nair, Sandeep V; Hatua, Kamalesh; Prasad, Nvpr Durga; Reddy, D. Kishore

doi:10.1109/iecon.2018.8591856

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…[22] reported significant rotor oscillations in the open loop, which may be a reason for loss of synchronism. These oscillations were studied and preventive measures were suggested in [27,28]. Another interesting study was reported in [29], which enhanced the open-loop technique and adapted it for use with a long line and additional transformers.…”

Section: Speed Open-loopmentioning

confidence: 99%

Instant Closing of Permanent Magnet Synchronous Motor Control Systems at Open-Loop Start

Dianov¹

2022

Sustainability

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Nowadays, position sensorless permanent magnet synchronous motor drives are gaining popularity quite rapidly, and have become almost standard in many applications such as compressors, high speed pumps, etc. All of these drives involve estimators to calculate the speed and the position of the rotor, which are necessary for proper operation of vector control. While these estimators, with the exception of injection-based ones, work well in the middle and high-speed ranges, they cannot operate at low speeds. In order to overcome this problem, sensorless control systems include different starting techniques, with the most popular being open-loop starting. In this approach, the motor is accelerated in open-loop mode until it reaches the speed where estimator operates stably, then the control system is closed. However, the weakest point of this method is the technology of closing the system, which typically creates transients and can even be the cause of loss of stability. This paper proposes a method for instant and seamless transition from open-loop to closed loop which works perfectly under different load conditions. Other starting techniques are considered and compared with the proposed method.

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Section: Speed Open-loopmentioning

confidence: 99%

Instant Closing of Permanent Magnet Synchronous Motor Control Systems at Open-Loop Start

Dianov¹

2022

Sustainability

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“…Considering that the rotor motor does not need high observation accuracy when starting and running at low speed, a simple structure and easy-to-implement I/F control method can be adopted, which can start the rotor motor without detecting the initial position of the rotor [6][7][8]. During the operation of the motor, the 0…”

Section: The Principle Of I/f Controlmentioning

confidence: 99%

The sensorless control strategy of UAV rotor motor in full speed range

Xiang

Guo

et al. 2021

E3S Web Conf.

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UAV (Unmanned Aerial Vehicle) has broad application prospects in various fields. In order to meet the needs of stability and efficiency during flight, a surface-mounted permanent magnet synchronous motor is used as its rotor motor, and a position sensorless control technology is used to control the rotor motor with high efficiency and high dynamic response. This paper proposes a position sensorless control strategy in the full speed range for the actual application requirements of UAV. In low speed ange, I/F control strategy with speed-open-loop and current-closed-loop is. In medium and high speed range, a sliding mode observer is adopted to provide estimated rotor position and speed. To achieve smooth switching from I/F control stage to speed closed-loop stage, a switching algorithm is proposed. The feasibility of the proposed hybrid control strategy is verified by simulation results.

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“…Furthermore, inaccuracy in the estimated stator resistance and stator inductance also adds to this error. Hence, to overcome the low‐speed issues of the stator voltage integration technique, an open‐loop I‐f method [32] is used for starting and low‐speed operation (0–8 Hz range). The back‐emf based sensorless vector control is used only in medium‐ and high‐speed range (above 8 Hz).…”

Section: I‐f Open‐loop Starting and Sensorless Vector Controlmentioning

confidence: 99%

“…A safety factor K s is included to incorporate the effect of error in estimated parameters (K s < 1). Speed and current oscillations occur during the frequency rampup interval due to the insufficient damping in the system [32]. These oscillations can even lead to mid-frequency instability, which is an inherent instability of open-loop controlled PMSM without damper windings [33].…”

Section: I-f Open-loop Starting and Sensorless Vector Controlmentioning

confidence: 99%

Quick and seamless transition method for I‐f to sensorless vector control changeover and on‐the‐fly start of PMSM drives

Nair

Hatua

Prasad

et al. 2020

IET Electric Power Applications

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A smooth changeover from the I‐f method to closed‐loop sensorless vector control is a critical requirement for permanent magnet synchronous motor (PMSM) drives using a back‐emf based sensorless algorithm for medium‐ to high‐speed range control. The existing methods provide a smooth transition by aligning the angle generated by I‐f control to the sensorless estimated angle. However, the overall start‐up time increases due to the additional transition interval, which limits the usability of these methods for applications requiring a quick start‐up. Furthermore, the use of a direct transition method to reduce the changeover time results in speed and current oscillation if the estimated position using sensorless algorithm is having an error. In the proposed method, the inverter pulses are disabled for a short duration and the machine back‐emf is measured after the stator current falls to zero. Therefore, a quick and seamless transition is achieved in the proposed method by accurately estimating the rotor position from the sensed back‐emf. The proposed method is also extended to perform on‐the‐fly start for power failure ride through during short time power supply interruption. The performance of the proposed method is verified using simulation and experiment on a 25 kW PMSM drive.

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A Smooth and Stable Open-Loop I-F Control for a Surface Mount PMSM Drive by Ensuring Controlled Starting Torque

Cited by 7 publications

References 16 publications

Instant Closing of Permanent Magnet Synchronous Motor Control Systems at Open-Loop Start

Instant Closing of Permanent Magnet Synchronous Motor Control Systems at Open-Loop Start

The sensorless control strategy of UAV rotor motor in full speed range

Quick and seamless transition method for I‐f to sensorless vector control changeover and on‐the‐fly start of PMSM drives

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