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Article
Publication date: 29 March 2013

Hongzhen Lei and Juanli Lan

This paper aims to prove the validity and necessity of knowledge stickiness and knowledge investment level.

249

Abstract

Purpose

This paper aims to prove the validity and necessity of knowledge stickiness and knowledge investment level.

Design/methodology/approach

Empirical study method is taken in this investigation which focuses on knowledge‐related industries' workers and proves the validity and necessity of knowledge stickiness and knowledge investment level with SPSS13.0 software.

Findings

The authors confirm the positive correlation between knowledge contribution and sharing residual claims based on management, and also confirm the positive correlation between knowledge stickiness, knowledge investment level and sharing residual claims based on technology. However, a negative correlation on management is also confirmed.

Originality/value

After an analysis on the incentive distortion caused by the information asymmetry between the principal and agent in the traditional incentive mode, a residual claims sharing structure containing knowledge contract is put forward.

Details

Journal of Knowledge-based Innovation in China, vol. 5 no. 1
Type: Research Article
ISSN: 1756-1418

Keywords

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Article
Publication date: 26 May 2022

Hao Lu, Shengquan Li, Bo Feng and Juan Li

This paper mainly aims to deal with the problems of uncertainties including modelling errors, unknown dynamics and disturbances caused by load mutation in control of permanent…

228

Abstract

Purpose

This paper mainly aims to deal with the problems of uncertainties including modelling errors, unknown dynamics and disturbances caused by load mutation in control of permanent magnet synchronous motor (PMSM).

Design/methodology/approach

This paper proposes an enhanced speed sensorless vector control method based on an active disturbance rejection controller (ADRC) for a PMSM. First, a state space model of the PMSM is obtained for the field orientation control strategy. Second, a sliding mode observer (SMO) based on back electromotive force (EMF) is introduced to replace the encode to estimate the rotor flux position angle and speed. Third, an infinite impulse response (IIR) filter is introduced to eliminate high frequency noise mixed in the output of the sliding mode observer. In addition, a speed control method based on an extended state observer (ESO) is proposed to estimate and compensate for the total disturbances. Finally, an experimental set-up is built to verify the effectiveness and superiority of the proposed ADRC-based control method.

Findings

The comparative experimental results show that the proposed speed sensorless control method with the IIR filter can achieve excellent robustness and speed tracking performance for PMSM system.

Research limitations/implications

An enhanced sensorless control method based on active disturbance rejection controller is designed to realize high precision control of the PMSM; the IIR filter is used to attenuate the chattering problem of traditional SMO; this method simplifies the system and saves the total cost due to the speed sensorless technology.

Practical implications

The use of sensorless can reduce costs and be more beneficial to actual industrial application.

Originality/value

The proposed enhanced speed sensorless vector control method based on an ADRC with the IIR filter enriches the control method of PMSM. It can ameliorate system robustness and achieve excellent speed tracking performance.

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