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Electromagnetic Principles of Switched Reluctance Machines
Published in Berker Bilgin, James Weisheng Jiang, Ali Emadi, Switched Reluctance Motor Drives, 2019
The co-energy principal is heavily used in systems storing energy. For example, in a mechanical system, energy, dW is defined as the work done when force, F acting on an object moves it a certain distance, dx in the direction of the force: dW=Fdx. Similarly, fixing the displacement and changing the force can calculate the same result. However, from the physical perspective, if there is no displacement, there is no work or energy. But, in terms of units dW′=xdF is also expressed in units of joules and it is referred as co-energy [6]. Co-energy is a non-physical quantity used in theoretical analysis of energy storing systems. It is heavily used in the analysis of non-linear systems, such as electric machines and electromechanical devices.
A novel solar photo voltaic powered drive for the SRM for irrigation purposes using a partial resonant AC link DC to a DC boost converter
Published in Automatika, 2023
R. Kalai Selvi, R. Suja Mani Malar
The torque produced is a function of the ratio of the change in “Co-Energy” denoted as δE' to the change in rotor position δθ. In the characteristics relating to the flux linkage and the current through the winding, the area under the magnetization curve is the co energy. The expression of torque can be given as Equation (1) Thus in the SRM which is a single excited system, there is only one exciting coil and the change of flux linkage is a function of θ and the current is a constant. That is λ (θ) = L(θ) * I; I is the stator current and L is the inductance of the coil. Θ is the angle between the axis of the stator pole and the axis of the rotor pole. The torque is given in (2) The mechanical work done = δEm = δE2.
Sensored and sensorless scalar-control strategy of a wind-driven BDFRG for maximum wind-power extraction
Published in Journal of Control and Decision, 2018
Mohamed G. Mousa, S. M. Allam, Essam M. Rashad
The number of poles of the reluctance rotor is governed by the summation of the pole-pairs of the two stator windings in order to get a rotor position-dependent mutual coupling between the two stator windings. The resultant mutual inductance variation with rotor position causes a change of co-energy as well as torque production (Hopfensperger & Atkinson, 2001). The electromechanical energy conversion can occur only at a particular speed (Liang et al., 1991). This speed is given by:
Design and Finite Element Analysis of a 6/4 Pole Multi-Layer Fully Pitched Switched Reluctance Motor to Reduce Torque Ripple
Published in Electric Power Components and Systems, 2023
As seen in Figure 3, co-energy, which expresses half of the electrical energy input in linear magnetic systems, is expressed with the equation given in (2) depending on the flux linkage (λ) and, current (i) [17].