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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].
In the present, unmanned aerial vehicles (UAV) has arisen more and more attention due to the high efficiency, ease and safety in completing complex missions [1][2].
By appropriately inserting ferrite magnets into the rotor of a synchronous reluctance motor (SynRM), it is realized that the operational power factors and torque outputs of this SynRM can be improved.
The third harmonic current is commonly injected into the fundamental one to improve the output torque of the multi-phase machines. It can interact with the third harmonic back-EMF, contributing to positive torque. However, the output torque may not always be improved with the third harmonic current injection under the same rms value constraint. The optimal ratio of the third harmonic current to the...
This paper investigates a new direct-drive machine, which artfully integrates a permanent-magnet brushless machine (PMBM) into a magnetic gear (MG). In order to achieve the capability of low speed operation and high torque output, the PMBM and MG share the same high-speed rotor. The key of the proposed machine is to adopt the Halbach permanent-magnet (PM) arrays and employ them to compose the PM poles...
Upon the increasing attentions on energy efficiency and hence environmental protection, the development of the electric vehicles (EVs) has been accelerating [1]. Particularly, the electronic differential (ED) system has been developed to eliminate the heavy gearbox for the curvilinear movement [2]. Yet, the traditional ED system is achieved by controlling each of the wheels independently, while fatal...
By using the powder metallurgy technology and magnetic isotropy characteristic of the soft magnetic composite (SMC) material, various kinds of the complex structure permanent magnet synchronous machines (PMSMs) can be designed and fabricated easily e.g., axial-flux machine, claw pole machine (CPM) and transverse-flux machine (TFM) [1]-[4]. With the global coil applied in the CPM and TFM, the CPM and...
Soft magnetic composite (SMC) material is a relative new soft magnetic material which has undergone the substantial development during last decades. Especially with the low-pressure pressing on the mold, the magnetic core with SMC of the machine can be fabricated easily and the manufacture cost can be reduced greatly. By using this technology, a claw pole machine (CPM) with SMC core was designed and...
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...
Recently, Mars exploring draws more and more attention due to the successful landing of Mars Rovers. It was over 64 months for the Spirit Rover working on Mars. Also, since January 25, 2004, the Opportunity Rover works over 10 years on Mars. These two Rovers work much longer than their design period of 3 months. Furthermore, another NASA Mars Rover, the Curiosity Rover, works very actively on Mars...
With the great concerns on alleviating the pollution on the environment and traffic congestions; there is a trend for developing the electric vehicles [1], [2]. For such drive system, the in-wheel machines draw the main attention due to its relative higher torque density and compact structure [1]. With the permanent magnet (PM) located on the stator teeth, the flux switching permanent magnet machine...
To meet the ever stringent operational efficiency requirements, effective reduction of the copper losses is one of the viable approaches for small-power induction motors. From the corresponding International Electrotechnical Commission (IEC) standards, though the line-start permanent magnet (PM) motors can supply relatively larger torques with higher efficiencies in the super- (IE4) or even ultra-premium...
Mechanical gearbox, which plays significant roles in vehicular transmission system, inherently suffers from the drawbacks of wear-and-tear and regular maintenance [1]. Magnetic gears are considered as the preferred gearing device for vehicular transmission system because they have the merits of silent operation, maintenance free and physical isolation. However, the gear ratio of magnetic gear is fixed...
This paper aims at comparing the performances of induction and synchronous reluctance machines considering the driving cycle. The analytical models of the two machines are proposed and validated. The geometries and the electrical controls of these machines are used to define the total energy losses during the driving cycle. The methodology of the global optimization is also presented in this paper.
Electromagnetic characteristics are critical for performance evaluation of switched reluctance machine (SRM), but it's very difficult to get them due to strong nonlinearity and coupling. In this paper, the detailed magnetization and torque characteristics of SRM are obtained by finite element method (FEM) firstly, and then an analytic method (AM) is presented to calculate the characteristics. The...
This paper firstly describes the research background of the wind turbine imitation system, indicating the needs for the wind turbine imitation in laboratories. The current development status and the significance of the wind turbine imitation based on the switched reluctance (SR) motor are introduced. Then the model of the wind turbine and SR motor is expounded, from which the control theory and methods...
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