Abstract
In recent years, magnetic-barrier rotor has been put forward for brushless doubly-fed generator (BDFG) application owing to its desirable performance, such as high power density and strong magnetic coupling ability. However, it also causes significant losses induced by harmonics and high temperature problem. Hence, it is a major challenge to evaluate Bref_DFG temperature rise fast and accurately. So far, aiming at magnetic-barrier rotor, there has been no accurate thermal network model established achieving this goal. In addition, wingding end encapsulating technology has been used for a few years and its heat dissipation potential is determined by the materials. Therefore, the application of novel material in winding encapsulating structure is desirable to improve the heat dissipation potential. In this paper, an equivalent thermal network model, thermal resistance models of magnetic-barrier rotor, and a winding encapsulating structure with novel materials are further established for thermal analysis. Subsequently, temperature distributions for BDFG components are also calculated by finite element method, while the results are compared with those by analytical method. The BDFG prototype is manufactured with experimental tests performed. The correctness of the equivalent thermal network models proposed in this paper is verified by the test results.
Highlights
IN recent years, brushless doubly-fed generators (BDFG) have attracted extensive attention for wind power generation system due to their attractive characteristics such as high reliability, low operating and maintenance cost, small capacity converter and power factor adjustable[1]-[4].rich harmonics can be found in the magnetic field of BDFG
In order to solve the problems mentioned above, in this paper, a novel equivalent thermal network model of BDFG, thermal resistance calculation models of magnetic-barrier rotor and winding encapsulating structure adopting new mixed materials used for enhancing heat dissipation potential are proposed for the thermal calculation for the first time
As the thermal resistance models for frame, stator tooth and yoke, shaft, end cover and winding of BDFG are identical with conventional induction motor, this paper only presents the thermal resistance models for pouring mixture and novel magnetic-barrier rotor
Summary
IN recent years, brushless doubly-fed generators (BDFG) have attracted extensive attention for wind power generation system due to their attractive characteristics such as high reliability, low operating and maintenance cost, small capacity converter and power factor adjustable[1]-[4]. It is notable that thermal network method effectively overcomes the disadvantages of the above methods and has widely used in the thermal calculation of permanent magnet motors [11], [12] and induction motors [13], [14] It has rarely been used for BDFG so far due to its complicated rotor structure which makes the heat transfer relation between nodes more complex. In order to solve the problems mentioned above, in this paper, a novel equivalent thermal network model of BDFG, thermal resistance calculation models of magnetic-barrier rotor and winding encapsulating structure adopting new mixed materials used for enhancing heat dissipation potential are proposed for the thermal calculation for the first time. 11kW 500r/min 400mm 285mm 284mm 72 225mm 380V 17A 25A 4 2 F DMD insulation paper 0.15mm 4900m3/h 100Pa
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