Abstract
A new speed and position controller respecting principles of near-energy optimal control for the drives with permanent magnet synchronous motor are developed as a contribution to the energy saving and environmental protection. Two various approaches to the energy saving controller design are analysed. The first approach is strictly based on energy optimal control theory and derives analytical solutions of the control problem. The second approach develops approximated solution for the drive position controller when the optimal speed trajectory is modified to correspond to the triangular and trapezoidal profile. This approach enables not only to compare energy demands of the individual control system design but also to exploit near-energy optimal controller for any controlled industrial drive
Highlights
The consumption of electric motor represents nearly half (46%) of global electricity consumption
The main contribution of this paper is mathematical analysis of energy-optimal speed and position control of the drives with a permanent magnet synchronous motor (PMSM), taking into account stator copper losses and its possible extension towards controlled drives currently used in industry
Described energy saving control algorithms for PMSM were tested by simulation
Summary
The consumption of electric motor represents nearly half (46%) of global electricity consumption. The main contribution of this paper is mathematical analysis of energy-optimal speed and position control of the drives with a permanent magnet synchronous motor (PMSM), taking into account stator copper losses and its possible extension towards controlled drives currently used in industry. To complete these tasks the efficient exploitation of the time available for prescribed manoeuvre is suggested for speed controlled drives. Due to the fact that absolute optimization of energy loss during position control isn’t the main goal of this paper, the symmetrical trapezoidal speed profile is chosen and modified to achieve lower energy expenditure for a specified manoeuvre time taking into account load torque as a function of the angular velocity.
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