Abstract: A switched capacitor amplifier circuit includes an operational amplifier, a first capacitor and a second capacitor each having one end connected to a negative input terminal of the operational amplifier, a first switching circuit configured to connect the other end of the first capacitor and a signal source during a first operation, a second switching circuit configured to connect the other end of the second capacitor and the output terminal of the operational amplifier so as to connect the output terminal and the negative input terminal of the operational amplifier through the second capacitor during the second operation, and an impedance converter circuit configured to convert an output impedance of the signal source into a specified impedance, the impedance converter circuit being connected between the first switching circuit and the other end of the first capacitor.

Abstract: An electric motor includes a stator and a rotor including a permanent magnet and an electromagnetic steel sheet. The electromagnetic steel sheet includes a magnet insertion hole, a first outer peripheral surface including an inter-pole part of the rotor, a second outer peripheral surface including a magnetic pole center part of the rotor, a first slit elongated in a circumferential direction of the rotor, and a first portion formed between the first slit and the magnet insertion hole. A distance from the first outer peripheral surface to the stator is larger than a distance from the second outer peripheral surface to the stator. The electric motor satisfies ?a<?b, where ?a is a first angle formed by a first line and a second line and ?b is a second angle formed by a third line and the second line.

Abstract: A stator includes a stator core and a coil wound around the stator core. The coil includes at least one first winding and at least one second winding connected to the first winding in series. The stator satisfies (C1/S1)>(C2/S2), where S1 is a total cross-sectional area on a first side of a coil-end part of the coil, S2 is a total cross-sectional area on a second side of the coil-end part, C1 is a total cross-sectional area of the first winding on the first side, and C2 is a total cross-sectional area of the first winding on the second side.

Abstract: An electric motor includes a rotor including a first rotor end and a second rotor end, and a stator including a first stator end and a second stator end. The first rotor end is located apart from the first stator end toward the first side. The second rotor end is located apart from the second stator end toward the first side. The relationship between the distances D1 and D2 satisfies D1>D2?0, where D1 is a distance from a permanent magnet to a first end plate, and D2 is a distance from the permanent magnet to a second end plate. The thickness of each of a plurality of electrical steel sheets is not less than 0.1 mm and not more than 0.25 mm.

Abstract: A rotor includes a first permanent magnet, a second permanent magnet, and an electromagnetic steel sheet. The electromagnetic steel sheet includes a magnet insertion hole, a projection, a first end part, a second end part (211b), a third end part, and a fourth end part. The rotor satisfies an expression of t?2×w×sin(R/2)?2×t, where t is a thickness of the electromagnetic steel sheet, R is an angle formed by the third end part and the fourth end part, and w is a distance from an intersection point of a straight line including the first end part and a straight line including the third end part to an intersection point of a straight line including the third end part and a straight line including the fourth end part.

Abstract: A magnetizing method includes the steps of preparing a rotor comprising a rotor core having a magnet insertion hole and a permanent magnet provided in the magnet insertion hole, placing the rotor so as to face a tooth around which a winding is wound, rotating the rotor in a first rotating direction by a first angle ?1 from a rotational position where a center of the magnet insertion hole in a circumferential direction of the rotor core faces a middle portion between both ends of the winding in the circumferential direction and supplying electric current to the winding, and rotating the rotor in a second rotating direction opposite to the first rotating direction by a second angle ?2 from the rotational position direction and supplying electric current to the winding. The second angle ?2 is smaller than the first angle ?1.

Abstract: A stator includes four split cores arranged in the circumferential direction. Each split core includes a yoke including a pair of joint parts, and a tooth. The shape of an end of the tooth is asymmetrical. An angle ?1 formed by a side surface of the tooth and a side surface of the yoke on the inner side in the radial direction of the stator satisfies 90 degrees<?1<180 degrees.

Abstract: A permanent-magnet-embedded electric motor includes a stator core including a yoke and a plurality of teeth, a rotor core including a plurality of magnet insertion holes, and a plurality of permanent magnets respectively inserted into the magnet insertion holes, each being arranged with a lateral direction set in a radial direction of the rotor core and with a longitudinal direction set in a direction orthogonal to the radial direction. When a width of base sections of the teeth is represented as S1, a width of a distal end sections of the teeth is represented as S2, a width of the permanent magnets in the longitudinal direction is represented as R1, and a width of the magnet insertion holes in an extension direction thereof is represented as R2, relations of S1?R1<S2 and S1?R2?R1 are satisfied.

Abstract: An electric motor includes a stator and a consequent-pole-type rotor including an annular rotor core disposed on an inner side of the stator and a plurality of permanent magnets disposed inside the rotor core and arrayed in a circumferential direction of the rotor core. The rotor core includes at least one slit provided inside the rotor core and disposed on an outer side of each of the permanent magnets in a radial direction of the rotor core, and at least one slit provided on an outer circumferential surface of the rotor core and disposed between the permanent magnets adjacent to each other.

Abstract: First and second coils are disposed in a slot of a stator core. A conductor of the second coil has a lower electrical resistivity than a conductor of the first coil. The slot includes a slot opening, a slot bottom portion disposed on a radially outer side of the slot opening, and first and second side portions disposed therebetween. A first straight line connects borders of the slot bottom portion with the first and second side portions. A first region is surrounded by the first straight line and the slot bottom portion. A second region is located on a radially outer side of the slot opening and on a radially inner side of the first straight line. Areas S1 and S2 of the first and second regions, total cross-sectional areas A1 and A2 of the first coil in the first and second regions satisfy (A1/S1)>(A2/S2).

Abstract: A motor includes a stator having a yoke having an annular shape about an axis line, and a first tooth and a second tooth extending from the yoke toward an inner or outer peripheral side, and a rotor rotatable about the axis line. The rotor has a permanent magnet on a surface facing the stator. Each of the first tooth and the second tooth includes an end portion facing the permanent magnet. The permanent magnet has a first magnetic pole and a second magnetic pole adjacent in a circumferential direction about the axis line, and a groove formed in an inter-pole portion between the first magnetic pole and the second magnetic pole. An interval L1 in the circumferential direction between the end portion of the first tooth and the end portion of the second tooth, and a width L2 of the groove satisfy 1.00<L2/L1?3.75.

Abstract: A slot includes a coil housing portion having first and second side portions and a bottom portion. A first straight line connects first and second points which are boundaries between the bottom portion and the side portions. A slot opening has third and fourth points closest to the first and second side portions. A second straight line connects the first and third points. A third straight line connects the second and fourth points. A first region is surrounded by the first straight line and the bottom portion. A second region is surrounded by the second straight line and the first side portion, and is surrounded by the third straight line and the second side portion. A third region is surrounded by the three straight lines. Areas A1, A2 and A3 of the three regions and total cross-sectional areas S1, S2, S3 of coils therein satisfy (S1/A1)>(S2/A2)>(S3/A3).

Abstract: A motor rotor includes: a shaft; a smaller-radius iron core fixedly attached to an outer peripheral surface of the shaft; a larger-radius iron core disposed spaced apart from the smaller-radius iron core in a radial direction perpendicular to an axis of the shaft, which is formed in a ring shape in cross section by a combination of a plurality of iron core blocks, and disposed to share a common axis with the smaller-radius iron core; and an insulating resin portion used to fix the smaller-radius iron core and the larger-radius iron core. The larger-radius iron core and the smaller-radius iron core are formed of their respective different materials. The material forming the larger-radius iron core has an iron loss less than an iron loss of the material forming the smaller-radius iron core.

Abstract: A rotor includes a rotor core having a magnet insertion hole and a permanent magnet provided in the magnet insertion hole. The rotor core has a slit on an outer side of the magnet insertion hole in a radial direction of the rotor core. The permanent magnet is magnetized by placing the rotor so as to face a tooth around which a winding is wound, rotating the rotor in a first rotating direction from a rotational position where a center of the magnet insertion hole in a circumferential direction of the rotor core faces a middle portion between both ends of the winding in the circumferential direction and supplying electric current to the winding, and rotating the rotor in a second rotating direction opposite to the first rotating direction from the rotational position and supplying electric current to the winding.

Abstract: A stator includes a stator core and a winding wound around the stator core in wave winding. The winding includes an assembly of a plurality of covered wires, and an outer cover film that surrounds and covers the assembly and contains thermosetting resin. Each of the covered wires includes a conductor and an insulating film surrounding and covering the conductor. Each of the covered wires has a wire width of 1.5 mm or less.

Abstract: There is provided a treatment method that is capable of reducing burden on a patient when a medical sheet is indwelled in the body of the patient. A treatment method includes an introduction of introducing a catheter, which has stored a medical sheet (e.g., a myocardial cell sheet), to a heart inside a living body, and an indwelling step of drawing the myocardial cell sheet from the catheter and indwelling the myocardial cell sheet in the heart.

Abstract: A rotary electric machine includes a rotor core that rotates about a rotation axis, a plurality of first magnets disposed in a circumferential direction of the rotor core and embedded in the rotor core, a second magnet that includes a plurality of magnetic poles disposed in the circumferential direction of the rotor core and is disposed on an end surface of the rotor core in an extending direction of the axis, the second magnet being disposed at a position in a direction orthogonal to the axis, different from positions at which the plurality of first magnets are disposed, and a stator provided on an outer side of the rotor core in the direction orthogonal to the rotation axis.

Abstract: A rotor includes an electromagnetic steel sheet and a permanent magnet. The electromagnetic steel sheet includes a magnet insertion hole, a slit, a first end part, a second end part, a third end part, a fourth end part, and a fifth end part. Expressions of L1>L2 and L3?L2 are satisfied, where L1 is a distance from the first end part to the magnet insertion hole, L2 is a distance from a first boundary between the first end part and the second end part to the magnet insertion hole, and L3 is a distance from a second boundary between the second end part and the third end part to the magnet insertion hole.

Abstract: A motor includes a stator having a yoke having an annular shape about an axis line, and a first tooth and a second tooth extending from the yoke toward an inner or outer peripheral side, and a rotor rotatable about the axis line. The rotor has a permanent magnet on a surface facing the stator. Each of the first tooth and the second tooth includes an end portion facing the permanent magnet. The permanent magnet has a first magnetic pole and a second magnetic pole adjacent in a circumferential direction about the axis line, and a groove formed in an inter-pole portion between the first magnetic pole and the second magnetic pole. An interval L1 in the circumferential direction between the end portion of the first tooth and the end portion of the second tooth, and a width L2 of the groove satisfy 1.00<L2/L1?3.75.

Abstract: A rotor core has first and second magnet insertion holes along an outer circumference, and first and second slits along an inner circumference. The first and second slits have first and second facing portions facing each other. The first facing portion has a first inner end and a first outer end. The second facing portion has a second inner end and a second outer end. An inter-slit portion is provided between the first and second facing portions and is defined by a first straight line connecting the first and second inner ends and a second straight line connecting the first and second outer ends. In a radial direction of the rotor core, a minimum distance D1 from the inner circumference to the slits, a minimum width W1 of the slits, and a length W2 of the inter-slit portion satisfy at least one of D1<W1 and D1<W2.