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Stator Design
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
The stator is usually the outer body (or the inner body in some applications) of an electric motor to house the stator windings on a laminated steel core for creating a rotating magnetic field. The stator core is made up of a stack of prepunched insulated steel laminations assembled into a motor housing that is made of aluminum or cast iron. The thickness of the laminations and the type of electrical steel, as two of the key factors in the stator design, are chosen to minimize the eddy current and hysteresis losses. To receive stator windings, the inner surface of the stator is made up of a number of deep slots or grooves, distributed either uniformly or nonuniformly on the circumference of the stator. The arrangement of the windings within the stator slots depends on the number of motor poles, the number of phases, and the number of slots. In practice, there are several types of windings commonly adapted by motor manufacturers, such as concentric winding, lap winding, spit winding, and wave winding. The two common winding configurations used for three-phase motors are ∆ and Y.
Hydroelectric Power Generation
Published in Leonard L. Grigsby, and Distribution: The Electric Power Engineering Handbook, 2018
Steven R. Brockschink, James H. Gurney, Douglas B. Seely
The stator core is composed of stacked steel laminations attached to the stator frame. The stator winding may consist of single-turn or multiturn coils or half-turn bars, connected in series to form a three phase circuit. Double layer windings, consisting of two coils per slot, are most common. One or more circuits are connected in parallel to form a complete phase winding. The stator winding is normally connected in wye configuration, with the neutral grounded through one of a number of alternative methods that depend on the amount of phase-to-ground fault current that is permitted to flow (IEEE, C62.92.2, C37.101). Generator output voltages range from approximately 480 VAC to 22 kVAC line-to-line, depending on the MVA rating of the unit. Temperature detectors are installed between coils in a number of stator slots.
Minimum Excitation Limiter
Published in Donald Reimert, Protective Relaying for Power Generation Systems, 2017
The stator core is constructed of thin sheets of magnetic steel stacked perpendicular to the axis of the rotor. Each sheet is insulated from its neighbor. This laminated construction drastically reducing eddy currents and core heating caused by the eddy currents. Laminations are only effective in eddy current reduction when alternating flux is applied parallel to the laminations. The end-core leakage flux exits the stator parallel to the rotor and perpendicular to the stator laminations. Losses for flux perpendicular to the laminations can be 100 times greater than for flux applied parallel to the plane of the lamination.2 The high losses confined to the small end-core region can cause rapid temperature rise and damage within minutes. Visible signs of damage would include blueing of metal structures in the end-core region and charring of stator winding insulation at the point where it emerges from the stator.
Comparative Assessment of Converter Topologies for Switched Reluctance Motor Drives
Published in IETE Journal of Research, 2021
Damarla Indira, Mahendran Venmathi
Switched reluctance motor (SRM) drives have become more prominent for adjustable speed drive applications such as hybrid electric vehicles (HEVs), aircraft, process control industries, electric power steering, starter generation system, wind power generation and servo drive [1–7]. SRMs are used in various applications due to their rugged construction, wide speed range, excellent fault tolerance, four quadrant operations, low production cost and high starting torque [8–11]. SRM drives are superior to other traditional machines since they show high efficiency, absence of permanent magnets, lack of rotor windings and brushes. Nevertheless, they also suffer from some drawbacks compared to permanent magnet machines such as high torque ripple and acoustic noise, which affects the overall performance of the drive. The SRM is a singly excited doubly salient pole variable reluctance machine. The stator is made up of magnetic steel laminations with a slotted structure and it carries the concentric winding. The rotor with salient poles and laminated construction doesn’t carry any winding and magnets. The cross-sectional view of the 3-phase 6/4 SRM is shown in Figure 1.
Design and optimisation of slotted stator tooth switched reluctance motor for torque enhancement for electric vehicle applications
Published in International Journal of Ambient Energy, 2022
Mahesh A. Patel, Kamran Asad, Zeel Patel, Mohit Tiwari, Purv Prajapati, Hitesh Panchal, M. Suresh, Ralli Sangno, Mohammd Israr
Due to its rotor structure, as shown in Figure 1, the SRM structure is very basic. The stator consists of copper windings and its arrangement does not have a permanent magnet. Windings are supplied on the stator poles supplied by electronic power switches, in which the opposite poles provide the same series of windings. The research SRM consists of 8 stator and 6 rotor poles (8/6 configuration). For the stator and rotor cores, the steel material is used. The stator and rotor architectures are highly non-linear and discreet in their process of torque output.