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The thermal demagnetization of the magnet by the eddy-current loss at high rotational speeds often becomes one of the major problems in the PM machines [1].
Brushless excitation generator is highly reliable and easily maintained.[1] In this paper, an integrated brushless excitated method (IBEM) is proposed in this paper. It can realize brushless excitation for the generator whose excitation windings are placed on the rotor. A brush excitation Tangential/ Radial Hybrid Excitation Synchronous Generator (T/R-HESG) is improved as brushless excitation generator...
This paper discusses the design procedure of a super high speed permanent magnet synchronous machine. A 3kW radial PMSM designed for operation up to 150,000 r/min is proposed in the paper. Thanks to the super high speed, the designed motor can achieve high energy density at 2.5 kW/kg(housing weight included) and efficiency is over 97%. The super high speed brings challenges both on electrical design...
The stability improvement of induction-generator-based wind turbine systems under power system fault conditions has been studied. Two types of generators are considered, namely rotor short-circuited induction generators and dynamic slip-controlled wound rotor induction generators. The factors affecting the stability are analysed. The characteristics of the induction-generator-based wind turbines are...
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