Abstract
Under the adverse trend of fossil energy attenuation and air pollution, wind power effectively alleviates the global energy crisis and environmental pollution. For wind turbines, especially large offshore wind turbines, their transportation, installation, and maintenance are very inconvenient. In order to solve this problem, this paper presents an E-core stator modular machine which inserts stator gap into the unwounded teeth of the fractional-slot concentrated winding (FSCW) permanent magnet (PM) machine. The winding factor of the new stator structure machine was derived. The electromagnetic models of 12-slot/10-pole and 12-slot/14-pole modular FSCW PM machines and traditional FSCW PM machines were established using the finite element analysis (FEA) software, and the open-circuit flux density, cogging torque, load torque, loss, and efficiency were simulated and analyzed. The results showed that the modular structure of E-core stator not only simplified the transportation, installation, and maintenance of wind turbines, but also optimized the electromagnetic performance of the 12-slot/14-pole machine, i.e., improved the output torque and operation efficiency.
Highlights
High-performance permanent magnet (PM) synchronous machines have been widely used in renewable energy fields, such as wind power generation, because of its small size, high torque density, and high efficiency [1]
The results showed that the load torque and efficiency were increased the PM machine with 12-slot/14-pole was modularized
For 12-slot/10-pole machines, since the slot pitch was smaller than the pole pitch and the existence of the stator gap further reduced the slot pitch, the pitch factor of the modular stator machine was reduced compared to the integral stator counterpart
Summary
High-performance permanent magnet (PM) synchronous machines have been widely used in renewable energy fields, such as wind power generation, because of its small size, high torque density, and high efficiency [1]. The coil of concentrated winding is shorter and more efficient than that of distributed winding, which was discovered by Hiroyuki Akita [8] On this basis, a stator structure which was separated but not completely disconnected at the corresponding stator yoke of each slot was proposed. Due to the influence of manufacturing process, there is an additional gap after installation This structure can be regarded as a modular stator structure. This modular the simplify waste of the punching andmanufacturing, simplify the machine manufacturing, strength is difficult to guarantee This modular structure limits the flux andtorque. The models of E-core modular PM machine and traditional single-layer concentrated winding. The results showed that the load torque and efficiency were increased the PM machine with 12-slot/14-pole was modularized.
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