Patent ID: 8796895
Filing Date: 2014-08-05
Classification: B60L,H02K,Y02T

Abstract:
1. An electric vehicle comprising: a body; a plurality of wheels provided at the body; an electromotor to drive at least one wheel, the electromotor including, a stator including a cooling fluid passage to allow cooling fluid to pass therethrough, a first rotor located at an outer side of the stator, and a second rotor located at an inner side of the stator, wherein each of the first rotor and the second rotor comprises a plurality of first permanent magnets and a plurality of second magnets made of different materials from each other; a battery provided in the body; an inverter coupled between the battery and the electromotor, the inverter including a plurality of elements to convert direct current (DC) power to alternating current (AC) power; and a cooling fluid circulation circuit coupled to the cooling fluid passage, the cooling fluid circulation circuit including a radiator to transfer heat from the cooling fluid to the radiator, wherein the plurality of the first permanent magnets are neodymium magnets, and the plurality of the second permanent magnets are ferrite magnets, wherein a neodymium magnet and a ferrite magnet are alternately disposed along a circumferential direction of the first rotor and the second rotor, and wherein the plurality of second permanent magnets of the second rotor align with the plurality of first permanent magnets of the first rotor, and the plurality of first permanent magnets of the second rotor align with the plurality of second permanent magnets of the first rotor.