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The paper presents the energy saving potential of induction machines by using variable rotor flux instead of commonly used constant flux. The efficiency optimized rotor flux depends on the actual load and speed of the motor. At low load it has to be decreased with reference to a pre-calculated lookup table. This table can be included in a field oriented speed control structure as reference value of...
To reduce energy consumption, we developed a technique that varies the number of magnetic poles in a permanent magnet (PM) motor. We propose a PM motor that can change the number of magnetic poles and produce two types of torque. When the motor operates with 8 poles, it produces a PM torque at low speeds. When the motor changes to 4 poles, it produces both PM torque and reluctance torque at high speeds...
This paper describes the phenomena of propagation of common mode high-frequency currents (HF) in the metallic parts of AC machines supplied by pulse width modulation (PWM) inverters. A detailed analysis based on finite elements modeling is proposed to identify the privileged paths of these HF currents and parameters that rule this phenomenon.
In this paper, the performance improvement of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) is presented. By using SMC, 3D shaped core is easily constructed. The teeth of the stator core extended in order to enlarge the pole surface area in the same outer dimension of the motor. In this presentation, the motor performance of the motor using the core made by...
Model predictive control (MPC) is a newly developed control algorithm which can realize the optimal by the state predict and optimal control with lest control errors and smallest control cost. MPC is widely applied in process control systems. In this paper, the MPC algorithm is realized in motor control system instead of the traditional PI regulators. The proposed MPC controller is generic and can...
The paper presents results of a research on the sensorless drive with PMSM supplied through the sinusoidal filter. The back electromotive force based observer is used to the shaft position estimation. Used in the study, the observer's correction function, contains multi integrators in the path, which improves the position estimation. Otherwise than in a typical implementation of the position observer,...
This paper presents a sensorless and stable control method for a five-phase permanent magnet synchronous motor (PMSM). At first, a model of a five-phase PMSM is presented. After that a stability study has been performed by the analysis of the eigenvalues of the state transition matrix of the linearized PMSM model about an operating point. The results show that the machine speed response is unstable...
Electric motors are key components in all electric drivetrains, particularly battery electric vehicles (BEVs). Consequently, the control strategies of those electric motors play an important role in the development of high performance BEV powertrains. Therefore, this article presents the control design, analysis and comparison of different motor control strategies. In this paper, the most popular...
Often, the components of a pumping system are not selected from the perspective of the total system, as the individual components are selected using different programs. In this paper, a selection tool that optimizes the energy conversion efficiency of a pumping system according to actual process requirements is introduced. The tool requires only the catalog data of the components. Its application...
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