scholarly journals A METHOD OF ECONOMICAL CONTROL OF A SYNCHRONOUS MOTOR WITHOUT A ROTOR POSITION SENSOR

2021 ◽  
pp. 36-46
Author(s):  
Ivan V. Viktorov ◽  
Vladimir M. Nikitin
Keyword(s):  
Energy Exchange ◽  
Voltage Drop ◽  
Synchronous Motor ◽  
Position Sensor ◽  
Rotor Position ◽  
Wide Range ◽  
Sensor Signals ◽  
High Dynamic ◽  
Autonomous Voltage Inverter ◽  
Load Angle

The article considers a method of economical speed control of synchronous motor with permanent magnet excitation using autonomous voltage inverter. The method provides stable (without tilting) rotation of the rotor without using the rotor position sensor signals. An algorithm, which realizes minimal losses in the machine and in the inverter, is proposed. The assumption of insignificant influence of voltage drop in stator winding active resistance on processes in synchronous machine accepted in the analysis is confirmed by parameters of real motors from 7DVM series and results of the experiment. It is shown that the mode with cosφ = 1 differs little from the generally accepted mode with load angle θ = φ. The results of experimental verification of the method in electric drive with 7DVM250 motor of 150 kW power are presented, which showed high dynamic stability of the system in a wide range of speeds and loads and while maintaining the most economical energy exchange between the motor and inverter (that is with cosφ = 1).

scholarly journals Sensorless interior permanent magnet synchronous motor control with rotational inertia adjustment

2017 ◽  
Vol 9 (1) ◽  
pp. 168781401668474 ◽  
Author(s):  
Yongle Mao ◽  
Jiaqiang Yang ◽  
Dejun Yin ◽  
Yangsheng Chen
Keyword(s):  
Permanent Magnet ◽  
Control Strategy ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Rotational Inertia ◽  
Estimation Errors ◽  
Rotor Position ◽  
Interior Permanent Magnet ◽  
Dynamic Estimation ◽  
High Dynamic

Mechanical model is generally required in high dynamic sensorless motor control schemes for zero phase lag estimation of rotor position and speed. However, the rotational inertia uncertainty will cause dynamic estimation errors, eventually resulting in performance deterioration of the sensorless control system. Therefore, this article proposes a high dynamic performance sensorless control strategy with online adjustment of the rotational inertia. Based on a synthetic back electromotive force model, the voltage equation of interior permanent magnet synchronous motor is transformed to that of an equivalent non-salient permanent magnet synchronous motor. Then, an extended nonlinear observer is designed for interior permanent magnet synchronous motor in the stator-fixed coordinate frame, with rotor position, speed and load torque simultaneously estimated. The effect of inaccurate rotational inertia on the estimation of rotor position and speed is investigated, and a novel rotational inertia adjustment approach that employs the gradient descent algorithm is proposed to suppress the dynamic estimation errors. The effectiveness of the proposed control strategy is demonstrated by experimental tests.

Design of Permanent Magnet Synchronous Motor Rotor Position Detection System Based on TLE5012

2014 ◽  
Vol 1028 ◽  
pp. 195-199
Author(s):  
Zhen Wang ◽  
Jian Ping Luo ◽  
Xiang Qiu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Superior Performance ◽  
Field Oriented Control ◽  
Position Sensor ◽  
Position Detection ◽  
Wide Range ◽  
The Magnetic Field

Currently, the application of permanent magnet synchronous motor is in a wide range of electric vehicle. Field oriented control algorithm is the main way to control permanent magnet synchronous motor, the magnetic field oriented control must be precise to get the rotational position of the motor. Therefore, the performance of the motor position sensor directly affects the accuracy of the magnetic field oriented control. There are three main kinds of sensors: photoelectric position sensor, magnetic position sensor and magnetic sensor. Due to its superior performance, the application of magnetic position sensors is increasingly widespread. This paper designed permanent magnet synchronous motor position detection circuit for the position of permanent magnet synchronous motor based on TLE5012 used to detect the position and 32-bit micro-controllers Infineon TC1767 used as the main chip.

Research and Develop on Static Frequency Converter of Pumped Storage Power Plant

2012 ◽  
Vol 608-609 ◽  
pp. 1120-1126 ◽  
Author(s):  
De Shun Wang ◽  
Bo Yang ◽  
Lian Tao Ji
Keyword(s):  
Power Plant ◽  
Control Strategy ◽  
Large Scale ◽  
Frequency Converter ◽  
Position Estimation ◽  
Position Sensor ◽  
Storage Unit ◽  
Rotor Position ◽  
Start Up ◽  
Pumped Storage

A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

scholarly journals Benchmark of Rotor Position Sensor Technologies for Application in Automotive Electric Drive Trains

Electronics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1063 ◽  
Author(s):  
Christoph Datlinger ◽  
Mario Hirz
Keyword(s):  
Evaluation Criteria ◽  
Position Sensor ◽  
Permanent Magnet Synchronous Machines ◽  
Rotor Position ◽  
Powertrain Control ◽  
Alternative Technologies ◽  
Traction Motors ◽  
Drive Trains ◽  
Automotive Powertrain ◽  
Electric Powertrains

Rotor shaft position sensors are required to ensure the efficient and reliable control of Permanent Magnet Synchronous Machines (PMSM), which are often applied as traction motors in electrified automotive powertrains. In general, various sensor principles are available, e.g., resolvers and inductive- or magnetoresistive sensors. Each technology is characterized by strengths and weaknesses in terms of measurement accuracy, space demands, disturbing factors and costs, etc. Since the most frequently applied technology, the resolver, shows some weaknesses and is relatively costly, alternative technologies have been introduced during the past years. This paper investigates state-of-the-art position sensor technologies and compares their potentials for use in PMSM in automotive powertrain systems. The corresponding evaluation criteria are defined according to the typical requirements of automotive electric powertrains, and include the provided sensor accuracy under the influence of mechanical tolerances and deviations, integration size, and different electrical- and signal processing-related parameters. The study presents a mapping of the potentials of different rotor position sensor technologies with the target to support the selection of suitable sensor technologies for specified powertrain control applications, addressing both system design and components development.

Product Review: High Dynamic Range Displays

2007 ◽  
Vol 16 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Patrick Ledda
Keyword(s):  
Dynamic Range ◽  
Liquid Crystal Display ◽  
Contrast Ratio ◽  
Luminance Level ◽  
High Dynamic Range ◽  
Natural World ◽  
Adaptation Level ◽  
Wide Range ◽  
High Dynamic ◽  
3D Software

In the natural world, the human eye is confronted with a wide range of colors and luminances. A surface lit by moonlight might have a luminance level of around 10−3 cd/m2, while surfaces lit during a sunny day could reach values larger than 105 cd/m2. A good quality CRT (cathode ray tube) or LCD (liquid crystal display) monitor is only able to achieve a maximum luminance of around 200 to 300 cd/m2 and a contrast ratio of not more than two orders of magnitude. In this context the contrast ratio or dynamic range is defined as the ratio of the highest to the lowest luminance. We call high dynamic range (HDR) images, those images (or scenes) in which the contrast ratio is larger than what a display can reproduce. In practice, any scene that contains some sort of light source and shadows is HDR. The main problem with HDR images is that they cannot be displayed, therefore although methods to create them do exist (by taking multiple photographs at different exposure times or using computer graphics 3D software for example) it is not possible to see both bright and dark areas simultaneously. (See Figure 1.) There is data that suggests that our eyes can see detail at any given adaptation level within a contrast of 10,000:1 between the brightest and darkest regions of a scene. Therefore an ideal display should be able to reproduce this range. In this review, we present two high dynamic range displays developed by Brightside Technologies (formerly Sunnybrook Technologies) which are capable, for the first time, of linearly displaying high contrast images. These displays are of great use for both researchers in the vision/graphics/VR/medical fields as well as professionals in the VFX/gaming/architectural industry.

Sensorless Control of IPMSM Using Modified Current Slope Estimation Method

2012 ◽  
Vol 150 ◽  
pp. 100-104
Author(s):  
Tao Zhang ◽  
Wei Ni ◽  
Hui Ping Zhang ◽  
Sha Sha Wu
Keyword(s):  
Permanent Magnet ◽  
Digital Signal Processor ◽  
Permanent Magnet Synchronous Motor ◽  
Estimation Method ◽  
Digital Signal ◽  
Synchronous Motor ◽  
Low Speed ◽  
Rotor Position ◽  
Operating Region ◽  
Interior Permanent Magnet

When the permanent magnet synchronous motor is operated at a low speed. The rotor position and speed are very difficult to estimate using the extended flux or back EMF method. A novel modified current slope estimating method is used to estimate the rotor position and speed in low speed in this paper. The mathematical models of an interior permanent magnet synchronous motor (IPMSM) are deduced. The basic principle of modified current slope method is introduced. The simulation control system is built based on Matlab and a TMS320LF2407 digital signal processor is used to execute the rotor position and speed estimation. The experimental and simulation results have shown that the rotor position and speed can be accurately estimated in a low-speed operating region.

Sign in / Sign up

Export Citation Format

Share Document