Zbigniew Krzemiński, Arkadiusz Lewicki and Mirosław Włas
To develop general forms of multiscalar models of the induction motor and to present properties of the sensorless control systems based on such models.
Abstract
Purpose
To develop general forms of multiscalar models of the induction motor and to present properties of the sensorless control systems based on such models.
Design/methodology/approach
Previously presented multiscalar model of the induction motor based on a stator current and rotor flux vector is generalized as a model of type 1. New model of type 2 is defined for stator current and the vector which is directly controlled by a voltage vector. The above models are applied in a sensorless control system with speed observer. Dynamical properties of the sensorless control systems are investigated by simulations and experiments.
Findings
Application of the multiscalar model of type 2 results in higher exactness of sensorless control system than application of the multiscalar model of type 1. Controlled variables are more smooth in transients.
Research limitations/implications
This is not an analytical proof of stability of the control systems.
Practical implications
Provides very useful information for development of sensorless control systems for the induction motor.
Originality/value
This paper extends the known method of nonlinear control of the induction motor to the general form. It is possible to choose the sensorless control system of better properties than those used so far.
Details
Keywords
Stanisław Burdziej, Rafał Haffer, Anna Moszyńska and Arkadiusz Karwacki
Previous research has demonstrated that the experience of fair treatment (organizational justice) motivates workers to accept their leaders’ decisions, even when these decisions…
Abstract
Purpose
Previous research has demonstrated that the experience of fair treatment (organizational justice) motivates workers to accept their leaders’ decisions, even when these decisions are viewed as unfavorable. We aim at extending these findings by testing for mediating effects of the perceived impact of the COVID-19 pandemic on the organization as a particular example of a hindering external condition. We expected that employees’ perception of management response to the pandemic would partly mediate the effect of organizational fairness on employee compliance.
Design/methodology/approach
In Study 1 we surveyed a nationally representative (N = 1,001) sample of employees. In Study 2 we used a representative sample (N = 250) of those workers who were laid off during the pandemic.
Findings
We show that an organization’s perceived ability to adapt to the pandemic partly mediated the relationship between organizational justice and acceptance of management decisions. Employees who were treated fairly were more ready to accept management decisions and viewed their organization as better prepared for hindering external conditions such as COVID-19. Their perceptions of organization’s ability to adapt partly mediated the effect of organizational justice on decision acceptance.
Originality/value
Our study is among the first to identify a link between organizational fairness and organizational adaptation. We show that employees perceive fair organizations as better prepared for external shocks.