Current gradient based rotor position detection of switched reluctance machines at low speed

2017 ◽  
Author(s):  
Iliya Ralev ◽  
Jonathan Schulte ◽  
Rik W. De Doncker
Keyword(s):  
Switched Reluctance ◽  
Low Speed ◽  
Rotor Position ◽  
Position Detection ◽  
Switched Reluctance Machines ◽  
Gradient Based

Novel Strategy for BLDC Motor Rotor Position Detection

2015 ◽  
Vol 772 ◽  
pp. 365-372
Author(s):  
Ling Zhi Cao ◽  
Sheng Hao Yang
Keyword(s):  
Motor Speed ◽  
Zero Crossing ◽  
Low Speed ◽  
Rotor Position ◽  
Voltage Difference ◽  
Position Detection ◽  
Position Signal ◽  
Speed Range ◽  
Terminal Voltage ◽  
Wide Speed Range

The detection of rotor position plays an important role in the motor speed-adjustment system. By analyzing the back-EMF method and its improved methods, we know the amplitude of back-EMF is too small to be detected when the motor run at low speed. A new detection method of rotor position has been proposed in this paper. It detects the zero crossing point of line terminal voltage difference to acquire the rotor position signal after a 90 degrees mechanical angle delay. The amplitude of line terminal voltage difference is large in wide speed range, so the rotor position signal can be accurately acquired in most situations. Simulation results proved that the new method can obtain the rotor position signal exactly in both high and low speed. It meets the wide speed range of motor.

Novel Current Profile of Switched Reluctance Machines for Torque Density Enhancement in Low-Speed Applications

2020 ◽  
Vol 67 (11) ◽  
pp. 9623-9634 ◽  
Author(s):  
Liren Huang ◽  
Z. Q. Zhu ◽  
Jianghua Feng ◽  
Shuying Guo ◽  
Yifeng Li ◽  
...  
Keyword(s):  
Current Profile ◽  
Switched Reluctance ◽  
Low Speed ◽  
Torque Density ◽  
Switched Reluctance Machines ◽  
Density Enhancement

A rotor initial position estimation method for sensorless field-oriented control of permanent magnet synchronous motor

2018 ◽  
Vol 40 (15) ◽  
pp. 4198-4207 ◽  
Author(s):  
Oussama Saadaoui ◽  
Amor Khlaief ◽  
Moez Abassi ◽  
Abdelkader Chaari ◽  
Mohamed Boussak
Keyword(s):  
Permanent Magnet ◽  
Pulse Sequence ◽  
Permanent Magnet Synchronous Motor ◽  
Estimation Method ◽  
Synchronous Motor ◽  
Position Estimation ◽  
Field Oriented Control ◽  
Low Speed ◽  
Rotor Position ◽  
Position Detection

In this paper, a new technique to improve initial rotor position detection at standstill of a permanent magnet synchronous motor (PMSM) is presented. Sensorless field-oriented control (FOC) of a PMSM at low speed remains a difficult task. In order to estimate the position and rotor speed, we proposed a novel structure of a full-order sliding mode observer (FO-SMO) in a sensorless FOC. At standstill, we used a voltage pulse sequence applied to the windings in order to detect the initial rotor position. With this technique, we managed to minimize the error on the estimated rotor position to 3.75° (electrical) compared with others. The validity of the proposed approach with a 1.1-kW low-speed PMSM sensorless FOC has been proved by experimental results.

A fault tolerant sensorless position estimation scheme for switched reluctance motor at low speed

2020 ◽  
Vol 39 (4) ◽  
pp. 823-837
Author(s):  
Feng Dong ◽  
Hao Chen ◽  
Shuai Xu ◽  
Sihang Cui
Keyword(s):  
Control Strategy ◽  
Fault Tolerant ◽  
Sensorless Control ◽  
Switched Reluctance Motor ◽  
Position Estimation ◽  
Content Type ◽  
Switched Reluctance ◽  
Low Speed ◽  
Rotor Position ◽  
Reluctance Motor

Purpose This paper aims to present a novel position sensorless control scheme with fault-tolerance ability for switched reluctance motor at low speed. Design/methodology/approach First, the detection pulses are injected in the freewheeling and idle intervals of each phase. Second, the aligned position of each phase can be detected by comparing the consecutive rise time of detection current. Third, the whole-region rotor position and real-time rotational speed can be updated four times for the improvement of detection accuracy. Finally, the fault-tolerant control strategy is performed to enhance the robustness and reliability of proposed sensorless scheme under faulty conditions. Findings Based on proposed sensorless control strategy, the estimated rotor position is in good agreement with the actual rotor position and the maximum rotor position error is 1.5°. Meanwhile, the proposed sensorless scheme is still effective when the motor with multiphase loss and the maximum rotor position error is 1.9°. Moreover, the accuracy of the rotor position estimation can be ensured even if the motor is in an accelerated state or decelerated state. Originality/value The proposed sensorless method does not require extensive memory, complicated computation and prior knowledge of the electromagnetic properties of the motor, which is easy to implement. Furthermore, it is suitable for different control strategies at low speed without negative torque generation.

An Innovative Rotor Position Detection at Stand-Still and Low Speed with Carrier Phase-Shifted PWM Method

2018 ◽  
Vol 19 (9) ◽  
pp. 1281-1289
Author(s):  
Kewang Qu ◽  
Guoqing Xu ◽  
Suk Won Cha ◽  
Yanhui Zhang ◽  
Wei Feng ◽  
...  
Keyword(s):  
Carrier Phase ◽  
Low Speed ◽  
Rotor Position ◽  
Position Detection
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