Abstract
Dynamic wireless power transfer (DWPT) technology shows a vast development prospect for EV application, with advantages of reducing the demand for battery capacity and improving the user experience. However, the need to improve output performance leads to a challenge in receiver design with limited space and allowable load on the EV side. In this paper, a design of a dual-phase non-salient pole (NSP) receiver for the EV DWPT system with bipolar transmitter is proposed, aiming at providing a solution to the contradiction between reducing the volume or cost and improving the misalignment tolerance of the receiver. The coupling principle of the proposed receiver is analyzed. The structure parameters are optimized by the finite-element simulation method. Combined with specific design indexes, it is proven by comparison with the existing dual-phase receiver that the proposed receiver is 35.4% smaller in volume and needs 47.0% shorter wires. Moreover, the significant advantage of the proposed dual-phase NSP receiver in misalignment tolerance is verified by simulations and experimental comparisons.
Highlights
Dynamic wireless power transfer (DWPT) technology is a kind of non-contact power supply method to moving receivers
Magnetic coupler, which is basically classified into long-rail type [4,5,6], coil array type [7,8] and bipolar type [9,10,11], is a key component of a DWPT system [12,13]
Of coupling compensation by two modules in Figure 3b, it is improving misalignment shown that when dAB is smaller than 400 mm, it is in a compensation state, when dAB is equal to 400 mm, it is in a critical compensation state, and when dAB is larger than 400 mm, it is in an overcompensation state
Summary
Dynamic wireless power transfer (DWPT) technology is a kind of non-contact power supply method to moving receivers. It shows a vast development prospect because it reduces the demand for battery capacity and improves the user experience [1,2,3]. Each winding is wound around the pole body and produces a magnetic pole. A pole shoe and pole body are not needed in the typical NSP structure [16]. The winding is wound around the yoke and produces a pair of opposite magnetic poles. According to the analysis of the relationship between winding deployment and magnetic pole distribution, the introduced bipolar type can be classified into SP and NSP forms.
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