Abstract: A printed circuit board is disclosed. The printed circuit board includes an insulation layer and a conductor layer having a GND pattern. The printed circuit board has a center portion, to which an element is to be mounted. The printed circuit board has a periphery portion and a slit pattern separating the periphery portion from the center portion. The GND pattern extends through the center portion and the periphery portion.

Abstract: An electric device includes: first and second electric elements, wherein electric power consumption and operation temperature limit of the first electric element is larger than the second electric element; a substrate made of a rigid flexible board; and a casing that accommodates the substrate with the first and second electric elements. The substrate includes first and second rigid portions and a flexible portion. The first and second electric elements are disposed on the first and second rigid portion, respectively. The flexible portion connects the first and second rigid portions. The thickness of the flexible portion is smaller than the first and second rigid portions. The flexible portion further includes a wiring for electrically coupling the first and second electric elements so that high speed communication is performed between the first and second electric elements.

Abstract: A printed circuit board is disclosed. The printed circuit board includes an insulation layer and a conductor layer having a GND pattern. The printed circuit board has a center portion, to which an element is to be mounted. The printed circuit board has a periphery portion and a slit pattern separating the periphery portion from the center portion. The GND pattern extends through the center portion and the periphery portion.

Abstract: An electro-hydraulic power steering apparatus in which a control device, a motor and a pump are integrated. The apparatus includes a first housing, a second housing, a control device surrounded by the first and second housings, a motor disposed on a side of the first housing and a pump disposed on a side of the second housing. The motor includes a rotor, a stator and a frame. The rotor has a first bearing supported by the first housing. The frame includes an inner circumferential face into which a stator core is press fitted and receives a second bearing of the rotor. The frame is secured to the first housing by a first clamp screw. The first housing and the second housing are secured by a second clamp screw. The first and second clamp screws are tightened from the hand of the frame.

Abstract: An electric device includes: first and second electric elements, wherein electric power consumption and operation temperature limit of the first electric element is larger than the second electric element; a substrate made of a rigid flexible board; and a casing that accommodates the substrate with the first and second electric elements. The substrate includes first and second rigid portions and a flexible portion. The first and second electric elements are disposed on the first and second rigid portion, respectively. The flexible portion connects the first and second rigid portions. The thickness of the flexible portion is smaller than the first and second rigid portions. The flexible portion further includes a wiring for electrically coupling the first and second electric elements so that high speed communication is performed between the first and second electric elements.

Abstract: A rotary electric machine is provided in which the press-fit load of a stator magnetic pole to a frame is stabilized, thus stabilizing the performance of the rotary electric machine, and that has high anti-corrosiveness and anti-rusty sealing property and is inexpensive. Particularly a rotary electric machine suitable for a motor for motor power steering apparatus is provided. In a rotary electric machine having a stator magnetic pole press-fitted and fixed on an inner circumferential surface of a cylindrical frame made of a steel plate and having a rotor arranged via a gap to an inner circumferential side of the stator magnetic pole, the frame is formed by pressing a surface-treated steel plate having a plating layer of aluminum, magnesium, silicon, and zinc for the remaining part formed on a surface of the steel plate, into a cylindrical shape.

Abstract: An electro-hydraulic power steering apparatus includes: a motor having a rotational shaft and provided with a bearing for rotatably bearing the rotational shaft; a hydraulic pump disposed at one end of the rotational shaft of the motor and driven by the motor; a first elastic body for supporting the bearing; and a second elastic body for pressing the bearing in an axial direction.

Abstract: A rotary electric machine is provided in which the press-fit load of a stator magnetic pole to a frame is stabilized, thus stabilizing the performance of the rotary electric machine, and that has high anti-corrosiveness and anti-rusty sealing property and is inexpensive. Particularly a rotary electric machine suitable for a motor for motor power steering apparatus is provided. In a rotary electric machine having a stator magnetic pole press-fitted and fixed on an inner circumferential surface of a cylindrical frame made of a steel plate and having a rotor arranged via a gap to an inner circumferential side of the stator magnetic pole, the frame is formed by pressing a surface-treated steel plate having a plating layer of aluminum, magnesium, silicon, and zinc for the remaining part formed on a surface of the steel plate, into a cylindrical shape.

Abstract: A stator core is formed into a cylindrical shape, 3n teeth are disposed at a predetermined pitch in a circumferential direction where n is a positive integer, and slots are formed between adjacent pairs of the teeth so as to open onto an inner circumferential side. A stator coil is installed as a concentrated winding in the stator core. A rotor is rotatably disposed inside the stator and 2n permanent magnets are disposed at a predetermined pitch in a circumferential direction on an outer peripheral portion of a shaft. The stator core is constructed such that a slot opening (d) and a slot pitch (p) at an inner circumferential surface of the stator core satisfy an expression 0.1?d/p?0.3.

Abstract: An electro-hydraulic power steering apparatus in which a control device, a motor and a pump are integrated. The apparatus includes a first housing, a second housing, a control device surrounded by the first and second housings, a motor disposed on a side of the first housing and a pump disposed on a side of the second housing. The motor includes a rotor, a stator and a frame. The rotor has a first bearing supported by the first housing. The frame includes an inner circumferential face into which a stator core is press fitted and receives a second bearing of the rotor. The frame is secured to the first housing by a first clamp screw. The first housing and the second housing are secured by a second clamp screw. The first and second clamp screws are tightened from the hand of the frame.

Abstract: An electro-hydraulic power steering apparatus includes: a motor having a rotational shaft and provided with a bearing for rotatably bearing the rotational shaft; a hydraulic pump disposed at one end of the rotational shaft of the motor and driven by the motor; a first elastic body for supporting the bearing; and a second elastic body for pressing the bearing in an axial direction.

Abstract: A stator core is formed into a cylindrical shape, 3n teeth are disposed at a predetermined pitch in a circumferential direction where n is a positive integer, and slots are formed between adjacent pairs of the teeth so as to open onto an inner circumferential side. A stator coil is installed as a concentrated winding in the stator core. A rotor is rotatably disposed inside the stator and 2n permanent magnets are disposed at a predetermined pitch in a circumferential direction on an outer peripheral portion of a shaft. The stator core is constructed such that a slot opening (d) and a slot pitch (p) at an inner circumferential surface of the stator core satisfy an expression 0.1≦d/p≦0.3.