Synchronous Constant Elapsed Time Speed Estimation Using Incremental Encoders

Anuchin, Alecksey; Dianov, Anton; Briz, Fernando

doi:10.1109/tmech.2019.2928950

Cited by 44 publications

(9 citation statements)

References 10 publications

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“…The mentioned firmware is intended for the sensorless control of compressor motors, where information on the rotor position and speed is provided by the back-EMF-type estimator. This estimator was verified in advance using an incremental encoder and signal processing proposed in [52,53], which demonstrated the estimator's stable operation at frequencies over 10 Hz and a maximum position error of about 5 degrees. This minimum speed is enough for the compressor to operate and does not need further improvements, considering that sensorless operation at low speeds is a challenging task [54].…”

Section: Methodsmentioning

confidence: 96%

Comparison of Feedback Field-Weakening Techniques for Synchronous Machines with Permanent Magnets

Dianov

2023

Vehicles

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In recent decades the market share of electrical cars has increased significantly, which has paved the way for the development of automotive electronics. Some of the most important parts of modern electrical vehicles are motor drives, which are used in car training and mechanization. Electrical drives are used in powertrains for traction, in air conditioning systems to cool cars and their parts, in doors for opening/closing as well as window movements, etc. The most popular motor type in electrical vehicles is synchronous motors with permanent magnets, which are compact and provide high torque. However, these motors require the development of control systems for proper operation. This system has to have the capacity to implement several state-of-the-art techniques, which can fully utilize motor potential, increase its efficiency, and decrease battery usage. One of these techniques is field-weakening, which overcomes speed limitations due to a lack of supply voltage and increases the motor’s speed operation range. This paper discusses the most popular approaches to field-weakening, including a new method proposed by the author. It considers both the pros and cons of each approach and provides recommendations for their usage. After that, this manuscript demonstrates the experimental results of each field-weakening technique obtained in the same motor drive, compares their performance, and discusses their strengths and weaknesses. Finally, the experimental part demonstrates that the proposed field-weakening approach demonstrates similar dynamics in load transients but provides 10 times less load to the microcontroller.

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Section: Methodsmentioning

confidence: 96%

Comparison of Feedback Field-Weakening Techniques for Synchronous Machines with Permanent Magnets

Dianov

2023

Vehicles

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“…The signals from sensors initially passed the built-in amplifiers and after that, were digitalized by a 12-bit internal ADC. The inverter was enhanced with an interface to position encoder [72,73] and communication circuits necessary for interaction with a PC, which was used for monitoring of internal data, and managing the control program.…”

Section: Methodsmentioning

confidence: 99%

Offline Measurement of Stator Resistance and Inverter Voltage Drop Using Least Squares

Dianov¹,

Anuchin

2023

IEEE Access

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Modern industrial and commercial electrical drives are typically designed to control motors of different types, operating under scalar, field-oriented or direct torque control. These drives execute various algorithm such as sensorless control, temperature monitoring, etc., which require the knowledge of motor drive parameters. In order to do this, the inverters allow data to be input manually or execute selfcommissioning routines before running the motor. The parameters necessary for proper operation include motor phase resistance and inverter voltage drop, which are especially important in low-speed range. This paper presents an offline technique for estimation of mentioned parameters, which can be obtained with enough precision for the overwhelming majority of applications. The proposed algorithm consequently injects DC-current of several levels into the stator of a motor, measuring the corresponding voltages. Each pair of current and voltage is a point in the voltage current characteristic of motor drive, thus set of these points maybe approximated with a first order polynomial using least squares method. The parameters of polynomial are desired inverter voltage drop and phase resistance. The experimental section analyzes estimation errors and their dependence on the number of injected levels, their values and filtering capability of measuring algorithm. After that, the authors give suggestions on algorithm parameters selection, depending on the demanded precision. Finally, the authors demonstrate a mass-producing dishwasher motor drive, which adopted this technique.

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“…In order to exclude reverse rotation at the start, the estimator is enhanced with an initial rotor position estimation algorithm [48]. The performance of the estimation algorithm was verified with the help of an incremental position encoder [49,50], which demonstrated that it operates at speeds over 10 Hz with the maximum estimation error of 3~4 electrical degrees. Since the control system was designed for operation with compressors, it was enhanced with a silent stoppage algorithm considered in [51].…”

Section: Methodsmentioning

confidence: 99%

Design of Constraints for Seeking Maximum Torque per Ampere Techniques in an Interior Permanent Magnet Synchronous Motor Control

Dianov¹,

Anuchin

2021

Mathematics

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The efficient control of permanent magnet synchronous motors (PMSM) requires the development of a technique for loss optimization. The best approach is the implementation of power loss minimization algorithms, which are hard to model and design. Therefore, the developers typically involve maximum torque per ampere (MTPA) control, which optimizes Joule loss only. The conventional MTPA control requires knowledge of motor parameters and can only properly operate when these parameters are constant. However, motor parameters vary depending on operating conditions; thus, conventional techniques cannot be used. Furthermore, many industrial drives are designed for self-commissioning, and they do not have prior information on motor parameters. In order to solve this problem, various MTPA-seeking techniques, which track the minimum of motor current, have been developed. The dynamic performance between these seeking algorithms and maximum deviation from the true MTPA trajectory are defined by the constraints in most cases, in which proper design improves the dynamic behavior of MTPA-seeking algorithms. This paper considers a PMSM, which was designed to operate in the saturation area and whose MTPA trajectory significantly deviates from the same curve constructed for the initial unsaturated parameters. This paper considers existing approaches, explains their pros and cons, and demonstrates that these methods do not utilize full potential of the motor. A new constraint design was proposed and explained step by step. The experiment verifies the proposed technique and demonstrates improvements in efficiency and dynamic behavior of the seeking algorithm.

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Synchronous Constant Elapsed Time Speed Estimation Using Incremental Encoders

Cited by 44 publications

References 10 publications

Comparison of Feedback Field-Weakening Techniques for Synchronous Machines with Permanent Magnets

Comparison of Feedback Field-Weakening Techniques for Synchronous Machines with Permanent Magnets

Offline Measurement of Stator Resistance and Inverter Voltage Drop Using Least Squares

Design of Constraints for Seeking Maximum Torque per Ampere Techniques in an Interior Permanent Magnet Synchronous Motor Control

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