Abstract: Provided is an AlN single crystal substrate having a three-layer structure composed of one AlN single crystal as a whole and is classifiable into the first layer, the second layer, and the third layer in this order in the thickness direction in terms of defect density, wherein the second layer has a defect density of 10 times or more the defect density of each of the first layer and the third layer.

Abstract: An AlN monocrystal plate disclosed herein may include: a first surface in a thickness direction; and a second surface opposing the first surface. A metal component containing region may be disposed substantially parallel to the first surface in an intermediate portion between the first surface and the second surface. In the metal component containing region, a plurality of metal components may be introduced and distributed. A type of the metal components may be Ga.

Abstract: A permanent magnet type rotor comprises an inner member 2 having an outer ring portion 21; an approximately annular outer member 1 having soft magnetism and an inner circumference contacting with an outer circumference of the outer ring portion; and plural permanent magnets 3 disposed at equal intervals on the outer circumference of the outer member toward the circumferential direction. At least one of the inner member 2 and the outer member 1 is made from a sintered material, and the inner member 2 and the outer member 1 are mutually sintered and bonded. Thickness and weight of a dynamotor itself can be reduced and high output and high efficiency can be achieved.

Abstract: A permanent magnet type rotor comprises an inner member 2 having an outer ring portion 21; an approximately annular outer member 1 having soft magnetism and an inner circumference contacting with an outer circumference of the outer ring portion; and plural permanent magnets 3 disposed at equal intervals on the outer circumference of the outer member toward the circumferential direction. At least one of the inner member 2 and the outer member 1 is made from a sintered material, and the inner member 2 and the outer member 1 are mutually sintered and bonded. Thickness and weight of a dynamotor itself can be reduced and high output and high efficiency can be achieved.

Abstract: The invention provides a hybrid vehicle drive apparatus in which a stator of a motor used under a high temperature environment can be simply and securely fixed to a motor housing. An AC motor is connected to a crank shaft between an internal combustion engine and a transmission, the AC motor is provided with a motor housing connected to each of the internal combustion engine and transmission, a stator constituted by a plurality of stator pieces arranged to form a ring shape, each of the stator pieces constituted by stator core teeth, a stator hold ring opening portion corresponds to an outer peripheral shape of the stator and is press-fitted to the opening portion, and the stator hold ring is fixed to the motor housing. A coefficient of thermal expansion of the stator substantially coincides with a coefficient of thermal expansion of the stator hold ring.