Abstract: It is desired to design a coreless motor in which a gap size is set to be as small as possible, and a magnet having a large energy product is used in order to increase the gap magnetic flux density since the coreless motor has no iron core so that the magnetic flux density is small in the gap part. A rotor core of the motor has a permanent magnet rotor which is formed by a compression molding means, and which is formed of a compact formed by molding a powder material, the compact comprising a bond magnetic portion mainly composed of a binder and a magnetic powder, and a soft magnetic portion mainly composed of a binder and a soft magnetic powder, the bond magnetic portion having magnetic poles having at least one surface which is mechanically bonded to the soft magnetic portion, in order to solve the inherent problems.

Abstract: It is an object of the present invention to provide a resin powder composed of an isobutylene polymer having low contents of a remaining solvent and a remaining monomer in a product. The present invention is accomplished by a method of removing a solvent while suspending the isobutylene polymer solution in water with a surfactant to obtain resin slurry, and subjecting the resin slurry to steam stripping at a temperature ranging from 150° C. to less than 180° C. to produce a resin powder without deterioration in quality, the resin powder having significantly low contents of the remaining solvent and remaining styrene in the resin.

Abstract: It is desired to design a coreless motor in which a gap size is set to be as small as possible, and a magnet having a large energy product is used in order to increase the gap magnetic flux density since the coreless motor has no iron core so that the magnetic flux density is small in the gap part. A rotor core of the motor has a permanent magnet rotor which is formed by a compression molding means, and which is formed of a compact formed by molding a powder material, the compact comprising a bond magnetic portion mainly composed of a binder and a magnetic powder, and a soft magnetic portion mainly composed of a binder and a soft magnetic powder, the bond magnetic portion having magnetic poles having at least one surface which is mechanically bonded to the soft magnetic portion, in order to solve the inherent problems.

Abstract: An electric rotating machine having a stator including a stator core formed by accumulating and fixing a plurality of stator steel sheets, and stator coils mounted onto the stator core, a rotor having a rotation shaft received within an inner peripheral side of the stator, a molded resin frame for receiving the stator therein and a pair of end brackets for rotatably holding the rotation shaft of the rotor via bearings. A respective end bracket is fixed on opposite ends of the stator by through bolts inserted into through bolt holes formed therein, and each of the end brackets having a plurality of two kinds of bolt holes. Each of the stator steel sheets forming the stator core functions as a magnetic circuit, and corner portions thereof are formed with bolt holes in a semi-circular shape with an opening portion for receiving the through bolts.

Abstract: An electric rotating machine having a stator including a stator core formed by a plurality of stator steel sheets, and stator coils mounted onto the stator core, a rotor having a rotation shaft, a frame for receiving the stator therein, and a pair of end brackets for holding the rotation shaft of the rotor via bearings rotatably. The pair of end brackets is fixed on opposite ends of the stator by through bolts inserted into through bolt holes formed therein and each of the end brackets has a plurality of two kinds of bolt holes. Each of the stator steel sheets has a substantially constant width in a radial direction over an entire periphery thereof so as to function as a magnetic circuit, and corner portions are formed with through bolt holes. The frame is a molded frame of resin having lighter specific gravity than a specific gravity of steel.

Abstract: An electric rotating machine having a stator including a stator core formed by accumulating and fixing a plurality of stator steel sheets, and stator coils mounted onto the stator core, a rotor having a rotation shaft received within an inner peripheral side of the stator, a molded resin frame for receiving the stator therein and a pair of end brackets for rotatably holding the rotation shaft of the rotor via bearings. A respective end bracket is fixed on opposite ends of the stator by through bolts inserted into through bolt holes formed therein, and each of the end brackets having a plurality of two kinds of bolt holes. Each of the stator steel sheets forming the stator core functions as a magnetic circuit, and corner portions thereof are formed with bolt holes in a semi-circular shape with an opening portion for receiving the through bolts.

Abstract: An electric rotating machine having a stator including a stator core formed by a plurality of stator steel sheets, and stator coils mounted onto the stator core, a rotor having a rotation shaft, a frame for receiving the stator therein, and a pair of end brackets for holding the rotation shaft of the rotor via bearings rotatably. The pair of end brackets is fixed on opposite ends of the stator by through bolts inserted into through bolt holes formed therein and each of the end brackets has a plurality of two kinds of bolt holes. Each of the stator steel sheets has a substantially constant width in a radial direction over an entire periphery thereof so as to function as a magnetic circuit, and corner portions are formed with through bolt holes. The frame is a molded frame of resin having lighter specific gravity than a specific gravity of steel.

Abstract: An electric rotating machine includes a stator with a stator core formed of a plurality of stator steel sheets with corner portions having through bolt holes for receiving through bolts therein, and a rotor. A frame receives the stator with end brackets being fixed on ends of the stator by through bolts inserted into the through bolt holes thereof. Each of the end brackets includes bolt holes corresponding to the through bolt holes formed on the stator steel sheets and bolt holes for at least attaching the electric rotating machine outside. The frame is molded so that axes of symmetry extending between a rotation shaft of the rotor and the through bolt holes of the stator steel sheets and axes of symmetry extending between the bolt holes for attaching the electric rotating machine outside and the through bolt holes of the stator steel sheets are shifted by a predetermined angle.

Abstract: An electric rotating machine includes a stator with a stator core formed of a plurality of stator steel sheets with corner portions having through bolt holes for receiving through bolts therein, and a rotor. A frame receives the stator with end brackets being fixed on ends of the stator by through bolts inserted into the through bolt holes thereof. Each of the end brackets includes bolt holes corresponding to the through bolt holes formed on the stator steel sheets and bolt holes for at least attaching the electric rotating machine outside. The frame is molded so that axes of symmetry extending between a rotation shaft of the rotor and the through bolt holes of the stator steel sheets and axes of symmetry extending between the bolt holes for attaching the electric rotating machine outside and the through bolt holes of the stator steel sheets are shifted by a predetermined angle.

Abstract: For providing an electric rotating machine, with which can be maintained the rotational symmetry of the stator iron or steel sheets, as well as the symmetry of the magnetic circuit, without increasing of the weight of the stator, wherein an electric rotating machine comprising: a stator having a stator core 101 being formed by fixing a laminated body of stator iron or steel sheets, and stator coils 102; a rotor 103 having a rotation shaft of; a frame 105 for receiving the stator therein; and end brackets 106 and 107 having through bolt holes 34 and outer attachment bolt holes 31, wherein the stator is fixed to the end brackets 106 and 107 by through bolts 14, and the electric rotating machine is installable onto an outside by means of outer attachment bolts, and the stator iron or steel sheet 1 is in a shape being symmetric both sides and upside down with axes B1-B4 and comprises a main body portion 11 and 15 and corner portions 12 in which are formed through bolt holes 13, the through bolt holes 13 are provi