Improved Fast Method of Initial Rotor Position Estimation for Interior Permanent Magnet Synchronous Motor by Symmetric Pulse Voltage Injection

Wang, Zihui; Cao, Zewei; He, Zhiyuan

doi:10.1109/access.2020.2983106

Cited by 26 publications

(14 citation statements)

References 21 publications

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“…The presetting method is the simplest initial position identification method and utilizes the electromagnetic torque caused by the given current to pull the rotor to the fixed location . The process of identification of the rotor's initial position based on the presetting method is shown in Figure .…”

Section: Initial Position Detection Methodsmentioning

confidence: 99%

Review of sensorless control techniques for PMSM drives

Wang

Chen

2019

IEEJ Transactions Elec Engng

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Permanent magnet synchronous motor (PMSM) drive systems have been increasingly applied in all kinds of high-power AC drives because of their inherent advantages of good performance, rapid dynamic response, as well as high reliability and efficiency. Precise control of the system traditionally depends on the shaft encoder, but the presence of the encoder could result in increased cost and volume, reduced reliability, etc. Therefore, the development of sensorless control techniques is important to avoid the above issues by the elimination of the sensor. Based on the running process of the motor, sensorless control techniques can be classified into four categories: initial position detection methods (IPDMs), low-speed control strategies, mid-high-speed control strategies, and full-speed control strategies. The fundamental principles, their advantages and disadvantages, the control precision, and the application range of these strategies on surface and interior permanent magnet synchronous motors (SPMSMs, IPMSMs) are described in detail in this paper. Finally, the development trend of PMSM sensorless control technologies is discussed. Initial position detection methodsThe initial rotor position is very crucial to the motor starting process by FOC. If the initial position is not accurate, many problems will be caused, such as excessive starting current, small starting torque, reverse rotating, or even start-up failures. At present, according to the motion state of the rotor in the detection process, IPDMs are divided into initial position identification methods with the rotor rotating, and initial position identification methods with rotor at standstill. The former is generally applied to the starting process of applications demanding low steadiness, such as pumps and fans, while the latter is mainly applied to cranes, electric vehicles, and elevator traction machines, which demand stringent requirements for riding comfort. Initial position identification methods with rotor rotatingThe presetting method is the simplest initial position identification method and utilizes the electromagnetic torque caused by the given current to pull the rotor to the fixed location [9][10][11][12]. The process of identification of the rotor's initial position based on the presetting method is shown in Figure 1. In addition, the method is independent of saliency, so it is suitable for both of SPMSM and IPMSM.T e = 1.5p(ψ f i s * sin( θ) + (L d − L q )i 2 s * sin( θ) cos( θ)) (1)

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Section: Initial Position Detection Methodsmentioning

confidence: 99%

Review of sensorless control techniques for PMSM drives

Wang

Chen

2019

IEEJ Transactions Elec Engng

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“…And the performance of the control system depends on the accuracy, dynamic response, and reliability of the information estimation. At present, according to the scope of application, there are two common estimation methods, among which the methods in [7][8][9][10] are suitable for zero low-speed operation, and the methods in [11][12][13][14][15][16] and [23][24][25][26][27][28][29] are suitable for medium high-speed operation.…”

Section: Introductionmentioning

confidence: 99%

“…However, this method will introduce highfrequency noise in specific applications, which applies to salient pole PMSM. In [9][10], the voltage pulses vector method is used to detect the initial position of the motor at zero speed, and this algorithm is simple to implement. But with the applied voltage vector approaching the actual rotor position, the difference of current response amplitude gradually decreases, which makes it more difficult to judge the amplitude.…”

Section: Introductionmentioning

confidence: 99%

New Sensorless Vector Control System With High Load Capacity Based on Improved SMO and Improved FOO

Lü

Zheng

et al. 2021

IEEE Access

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In the existing sensorless vector control system of permanent magnet synchronous motor (PMSM), direct differential calculation or phase-locked loop (PLL) control is often used to estimate the rotor speed, but this method has some problems of weak load capacity and slow dynamic response. A new sensorless vector control method based on an improved sliding mode observer (SMO) and improved fullorder observer (FOO) is proposed in this paper. The cut-off frequency of the low-pass filter is designed as a function of speed, the back EMF is fed back into the stator current estimation mathematical model, and the adaptive rate of feedback gains coefficient is proposed for improving the traditional SMO. The disturbance feedback matrix is introduced for improving the traditional FOO, and the estimated load torque is feedforward compensated to the given end of the quadrature current. An integrated system of corresponding algorithms is established, a test platform is built. The experimental results show that the speed and load torque estimation performance of the improved observer is better than that of the traditional observer in the process of sudden load change. The sensorless vector control system based on the proposed observer has a high dynamic response, load capacity, and reliability.INDEX TERMS Sensorless vector control system, improved sliding mode observer (SMO), improved fullorder observer (FOO), load capacity, reliability.

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“…As a low-cost compromise, these Hall-Effect sensors can be used with a proper algorithm to obtain a high-resolution rotor position. This can be a cost-effective solution offering good dynamic performance and eliminating the need for an initial rotor position estimation algorithm [7]. Some systems use the output speed computed from the Hall-Effect sensors with vector tracking observers that rely on Back-EMF (BEMF) estimation to obtain an accurate position estimate [8].…”

Section: Introductionmentioning

confidence: 99%

A Vector Controlled Drive System for Electrically Power Assisted Steering Using Hall-Effect Sensors

et al. 2021

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Permanent Magnet Synchronous Motors (PMSMs) have been replacing conventional DC motors in numerous automotive applications. One of which is Electrically Power Assisted Steering Systems (EPAS). PMSMs offer better performance and a longer lifetime while slightly increasing the system's cost and complexity. In a vector-controlled PMSM drive system, the rotor position sensor's resolution plays a vital role in the overall system performance. The better the resolution, the higher the cost. Although numerous sensor-less control algorithms currently exist, machine startup and operation with dynamically changing set-points and loads still impose a challenge for such an approach. For this reason, inexpensive Hall-Effect sensors have been recently used along with a proper position estimation algorithm to provide high-resolution rotor position. In this paper, an implementation of a vector-controlled drive system is applied to an EPAS using only low-resolution Hall-Effect sensors. Additionally, an improved rotor position estimation algorithm based on speed integration is developed to decrease estimation errors and torque ripples in the case of direction reversal. This is to cater to the dynamically changing commands encountered during the normal power assist operation. Comparisons of the proposed rotor position estimation system with the conventional technique are introduced. A complete representation of the proposed system is built using MATLAB/Simulink. An experimental setup is developed and built around a Motor-Driven Power Steering (MDPS) unit which is a column-assist type EPAS system made by Hyundai Mobis. The simulation and experimental results are presented to verify and evaluate the effectiveness of the proposed algorithm.

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Improved Fast Method of Initial Rotor Position Estimation for Interior Permanent Magnet Synchronous Motor by Symmetric Pulse Voltage Injection

Cited by 26 publications

References 21 publications

Review of sensorless control techniques for PMSM drives

Review of sensorless control techniques for PMSM drives

New Sensorless Vector Control System With High Load Capacity Based on Improved SMO and Improved FOO

A Vector Controlled Drive System for Electrically Power Assisted Steering Using Hall-Effect Sensors

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