Reactor, a reactor core and a method of manufacturing the same

An object of the present invention is to provide a reactor that is low loss, low noise, small in size, and that supports high power and high ripple current. A reactor according to the present invention includes a coil mounted on a reactor core in which at least two compacts containing an insulating material are combined, The reactor core has a saturation magnetization of 1.7 T or more, a first apparent permeability (μ 5k ) of 25 or more when a magnetic field of 5 kA / m is applied, and a second when a magnetic field of 35 kA / m is applied. see KakeToru permeability (mu 35k) is at first looked KakeToru permeability (μ 5k) 70% or more, when mounted AC resistance when a current of alternating current 10kHz to said coil in a state of being mounted on the core for reactor reactor, characterized in that the value (r 1) is simple when the AC resistance value when a current of the AC to the coil alone (r 0) of 2.5 times or less (r 1 ≦ 2.5r 0). [Selection] Figure 4