Back‐EMF‐based sensorless control system of hybrid SRM for high‐speed operation

Tang, Ying; He, Yingjie; Lee, Dong-Hee; Ahn, Ji Hyeon; Kennel, Ralph

doi:10.1049/iet-epa.2017.0641

Cited by 18 publications

(7 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The function of U11 with two resistors R 11 and R 12 is to invert the output of U9. After the circuit is modified, in the case of R 5 = R 8 and R 11 = R 12 , (13)- (15) are changed into…”

Section: Improved Flux Linkage Measurement Circuitmentioning

confidence: 99%

“…The installation of these sensors increases the cost and complexity of the entire drive system. Hence, several sensorless control methods have been proposed containing flux linkage method [3][4][5][6][7], pulse injection method [8,9], current-gradient method [10], modulation method [11], state observer-based method [12], and so on [13][14][15], some of which applied external circuits. The external flux linkage measurement circuit in [4] is used to obtain the instantaneous flux linkage, and the rotor position can be deduced based on the prestored flux linkage characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Circuit‐based flux linkage measurement method with the automated resistance correction for SRM sensorless position control

Liang

Chen

2018

IET Electric Power Applications

View full text Add to dashboard Cite

The accuracy of flux linkage measurement is significantly important for a number of sensorless control methods for switched reluctance motor (SRM). This study proposes a novel flux linkage measurement circuit with the automated resistance correction, which comprises only circuit components. During the SRM sensorless operation, the dependence of resistance on temperature leads to the errors in flux linkage measurement and position estimation. The developed scheme is based on the zero-crossing property which asserts that the flux linkage and current pass through zero simultaneously. Hence, the flux linkage error captured at the time when the current falls to zero represents the resistance error and is used for resistance correction. The proposed circuit has been successfully implemented and tested on a sensorless SRM system. Experiment results indicate that the proposed system in sensorless control can be operated stably at different load torques and at the condition of given speed mutation and load mutation, and the speed range in steady state with rated load torque is 0-160 r/min. The overall estimated position error remains within an acceptable margin of 2%. Hence, it significantly improves the sensorless position estimation and thus SRM performance. Δθ e absolute value of the average position error Δθ e max absolute value of the maximum position error

show abstract

“…The function of U11 with two resistors R 11 and R 12 is to invert the output of U9. After the circuit is modified, in the case of R 5 = R 8 and R 11 = R 12 , (13)- (15) are changed into…”

Section: Improved Flux Linkage Measurement Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Circuit‐based flux linkage measurement method with the automated resistance correction for SRM sensorless position control

Liang

Chen

2018

IET Electric Power Applications

View full text Add to dashboard Cite

show abstract

“…In [8], a new type of SRM of flat double stator segmented cup rotor is designed, where components of the radial force are generated when the inner stator and outer stator are opposite. e inner stator and outer stator can cancel each other, while the tangential force component can be added in the same direction, which could reduce torque ripple.…”

Section: Introductionmentioning

confidence: 99%

Modified PWM Direct Instantaneous Torque Control System for SRM

Cheng

2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Torque ripple is a defect of switched reluctant motors. DITC (direct instantaneous torque control) is harnessed to solve the problem as a traditional method, which is superior to TSF (torque sharing function). In this paper, a new controller is proposed with modified hysteresis and PWM in DITC. With the modified algorithm, the torque error will be reduced with PWM in DITC. The proposed algorithm is effective to improve sample and 0 status in a period. The modified algorithm is based on application of zero in the asymmetric half bridge, which is implemented as the buffer zone. In case of big torque error, hysteresis will mitigate error under the characteristic of fast responding. In case of small errors, the modified PWM will solve torque error in the equivalent strategy, which has adopted the essence of the impulse equivalent method. The modified controller is designed to reduce responding time and minimize the torque ripple under the proposed algorithm, which has been designed to harness different functions in different torque errors. Based on final simulation and experimental results, responding speed and reduction of output torque ripple are enhanced effectively.

show abstract

“…With the development of control technology, the digital signal processor and the power device, permanent magnet synchronous motor (PMSM) with field‐oriented control has shown significant advantages in industrial applications. Unlike the low‐speed motor, the high‐speed motor may face control challenges mainly caused by the small ratio of the sampling frequency over the synchronous frequency

f_{N} = f_{s} / f_{e}

[4–6]. Therefore, many researchers have reported motor control considerations to deal with those problems.…”

Section: Introductionmentioning

confidence: 99%

High‐performance control method for the MSTMP motor

Hai-feng

Liu

2020

IET Power Electronics

View full text Add to dashboard Cite

Permanent magnet synchronous motor (PMSM) is the ideal drive for the magnetically suspended turbo-molecular pump (MSTMP) for its high power density, reliable operation and high energy efficiency. Rotor position information is necessary to drive the PMSM. However, because of the installation space limitation and reliability requirement, position sensorless control technology without mechanical position sensors is more attractive. In this study, a sliding mode observer is adopted to estimate the back electromotive force (EMF) that contains the position information. Since the high-order harmonics in the back EMF would lead to harmonic position errors, a fixed frequency extraction filter is proposed to filter out the harmonics. A high precision speed control is of importance to ensure the performance of the MSTMP and also contributes to achieving a better position estimation accuracy, especially under strong disturbances. Therefore, a composite speed controller combining a sliding mode speed controller and a sliding mode disturbance observer is proposed to improve the speed control performance of the MSTMP. The effectiveness of the proposed high-performance control method for the MSTMP motor is evaluated with experiments.

show abstract

Back‐EMF‐based sensorless control system of hybrid SRM for high‐speed operation

Cited by 18 publications

References 35 publications

Circuit‐based flux linkage measurement method with the automated resistance correction for SRM sensorless position control

Circuit‐based flux linkage measurement method with the automated resistance correction for SRM sensorless position control

Modified PWM Direct Instantaneous Torque Control System for SRM

High‐performance control method for the MSTMP motor

Contact Info

Product

Resources

About