A Study on the Rotor Design of Line Start Synchronous Reluctance Motor for IE4 Efficiency and Improving Power Factor

Abstract

As international regulations of motor efficiency are strengthened, the line-start synchronous reluctance motor (LS-SynRM) is being studied to improve the efficiency of the electrical motor in industrial applications. However, in industrial applications, the power factor is also an important performance index, but the LS-SynRM has poor power factor due to the saliency characteristic. In this paper, the rotor design of LS-SynRM is performed to improve the efficiency and power factor. First, the barrier design is performed to improve the efficiency and power factor using the response surface method (RSM). Second, the rotor slot design is performed according to the length of bar for synchronization. Lastly, the rib design is performed to satisfy the power factor and the mechanical reliability. The final model through the design process is analyzed using finite element analysis (FEA), and the objective performance is satisfied. To verify the FEA result, the final model is manufactured, and experiment is performed.

Line-Start Synchronous Reluctance Motor With V-Shaped Rotor Laminations

“…1(c) and (d). The total axial length of the rotor lamination is obtained using (1), and the variations of cut-off pitch and cut-off angle for a V-shape structure are expressed as shown in ( 2) and (3), respectively [17]- [19]. The subscript n represents the stack lamination number, 𝜉 𝑛 is the axial length of each n individual stack lamination shape, 𝜉 𝑣 is the axial length of the middle lamination shape, 𝑤 𝑖 is the total thickness of steel lamination insulation coating, 𝛽 𝑝 is the barrier pitch angle, ℎ 𝑏 is the barrier height, 𝑤 𝑏 is the barrier web width, 𝑏 𝑒𝑟 is the barrier end radius, 𝑏 0(1 ,2) is the barrier web length, 𝑏 𝑖(1 𝑜𝑟 2) is the barrier base length, ℎ 𝑖(1,2,3) is the iron width, 𝑙 𝑟𝑡 is the tangential bridge width, 𝑙 𝑟𝑟 is the radial bridge width, 𝑟 𝑟𝑟 is the radius of the rotor lamination, and 𝑟 𝑠ℎ is the shaft radius.…”

“…Due to the rise in responsiveness towards upcoming sustainable development, as enjoined by international energy regulations, electric motor technologies for agriculture, irrigation systems, and industrial applications are endlessly under investigation for additional enhancements as far as the performance and main costs are concerned. The three-phase squirrel-cage induction motor (SCIM) is the most used in agriculture irrigation systems and industrial applications because of its simple structure, line-start ability, robustness, and low manufacturing cost [1]- [3]. However, the threephase SCIM has finite efficiency due to secondary copper loss and, therefore, several research efforts have been made to refine its efficiency [1].…”

“…The three-phase squirrel-cage induction motor (SCIM) is the most used in agriculture irrigation systems and industrial applications because of its simple structure, line-start ability, robustness, and low manufacturing cost [1]- [3]. However, the threephase SCIM has finite efficiency due to secondary copper loss and, therefore, several research efforts have been made to refine its efficiency [1].…”

Performance Improvement of Reluctance Synchronous Motor Using Brain Emotional Learning Based Intelligent Controller

“…At this stage, a famous strategy for a reluctance nous motor (MTPA) is considered under the condition of producing a constant to the strategy of maximum torque to current, minimizing stator current is selecte target function. Based on the Lagrange theorem, it can easily be argued that th The relationship between torque current and terminal current vector, adopted from [34].…”

“…This effect can be calculated by assuming a constant angle of stator current with respect to the direct axis of the rotor and then rotating the rotor and measuring torque. Figure 1 shows the result of this experiment for a six-kilowatt reluctance synchronous machine of an axially laminated anisotropic (ALA) type using the stator of an induction machine of 36 slots [34]. Ripple peak-to-peak torque is about 10 N.m, while the torque is calculated from the nonlinear model of this machine in the angle of current of 36.4 N.m.…”