Abstract: To achieve the foregoing object, a tubular linear motor of the present invention includes a core that has a tubular yoke and a plurality of teeth which are annular and provided at intervals in an axial direction on an outer periphery of the yoke; a winding mounted in a slot between the teeth; and a field magnet that is tubular, into which the core is movably inserted in the axial direction, and having N poles and S poles alternately arranged in the axial direction. An axial width Wi of a yoke-side inner peripheral edge of the teeth is larger than an axial width of an outer peripheral edge of the teeth.

Abstract: To achieve the above object, a cylindrical linear motor of the present invention includes a cylindrical linear motor includes: a core having a cylindrical yoke, and a plurality of teeth that are annular and are provided at intervals in an axial direction on an outer periphery of the yoke; a winding mounted in slots between the teeth; and a field which is cylindrical and in which the core is inwardly inserted movably in the axial direction to arrange N poles and S poles alternately in the axial direction, wherein the field has permanent magnets of a main magnetic pole radially magnetized and permanent magnets of a sub magnetic pole axially magnetized that are alternately arranged in a Halbach array in the axial direction, an axial length of the permanent magnet of the main magnetic pole is longer than an axial length of the permanent magnet of the sub magnetic pole, and the permanent magnet of the sub magnetic pole has a coercive force higher than that of the permanent magnet of the main magnetic pole.

Abstract: A tubular linear motor according to the present invention includes a core having a plurality of teeth having a tubular shape and provided on an outer periphery at equal intervals in an axial direction, winding wires of three phases of U-phase, V-phase, and W-phase mounted in slots between the teeth and of the core, and a field magnet having a tubular shape, in which the core is inserted inward so as to be movable in the axial direction, and a north magnetic pole and a south magnetic pole are alternately disposed on the inner periphery side in the axial direction, the field magnet has a yoke between the magnetic poles and in the axial direction, and the tubular linear motor has a two-pole 6n slot structure in which 6n slots are facing two poles, provided that n is an integer of 1 or more.

Abstract: To achieve the above object, a cylindrical linear motor of the present invention includes a cylindrical linear motor includes: a core having a cylindrical yoke, and a plurality of teeth that are annular and are provided at intervals in an axial direction on an outer periphery of the yoke; a winding mounted in slots between the teeth; and a field which is cylindrical and in which the core is inwardly inserted movably in the axial direction to arrange N poles and S poles alternately in the axial direction, wherein the field has permanent magnets of a main magnetic pole radially magnetized and permanent magnets of a sub magnetic pole axially magnetized that are alternately arranged in a Halbach array in the axial direction, an axial length of the permanent magnet of the main magnetic pole is longer than an axial length of the permanent magnet of the sub magnetic pole, and the permanent magnet of the sub magnetic pole has a coercive force higher than that of the permanent magnet of the main magnetic pole.

Abstract: To achieve the foregoing object, a tubular linear motor of the present invention includes a core that has a tubular yoke and a plurality of teeth which are annular and provided at intervals in an axial direction on an outer periphery of the yoke; a winding mounted in a slot between the teeth; and a field magnet that is tubular, into which the core is movably inserted in the axial direction, and having N poles and S poles alternately arranged in the axial direction. An axial width W of a yoke-side inner peripheral edge of the teeth is larger than an axial width of an outer peripheral edge of the teeth.

Abstract: A cutting tool 1 includes a cutting edge equipped with a helically curved groove 2 at a side outer periphery in the longitudinal direction, and a coolant passage pipe 3 extended internally and communicatively connected with ejection holes 4 of coolant arranged inside the groove 2 by way of a coolant passage pipe 31 branched from the coolant passage pipe 3 extended around a rotation center axis along the longitudinal direction or along the helically curved groove.

Abstract: A cutting tool 1 has cutting edges 2 formed by a plurality of side surfaces on both sides 21, 22 raised at a side portion along a longitudinal direction, and the cutting tool 1 in which a coolant passage pipe 30 is extended around a rotation center axis 5, and coolant passage pipes 31 branched from the extended coolant passage pipe 30 are projected along a direction of a raised side surface 21 on a rotating direction side of the raised side surfaces on both sides 21, 22.

Abstract: A cutting tool 1 includes a cutting edge equipped with a helically curved groove 2 at a side outer periphery in the longitudinal direction, and a coolant passage pipe 3 extended internally and communicatively connected with ejection holes 4 of coolant arranged inside the groove 2 by way of a coolant passage pipe 31 branched from the coolant passage pipe 3 extended around a rotation center axis along the longitudinal direction or along the helically curved groove.

Abstract: A linear motor that displaces a tubular body and a rod relative to each other in an axial direction includes teeth arranged in the axial direction so as to project from an inner peripheral surface of the tubular body, slots formed between adjacent teeth, coils disposed in the slots, and permanent magnets provided in the rod and arranged in the axial direction. The coils are constituted by one or more first phase coils, one or more second phase coils, and one or more third phase coils. The first, second, and third phase coils are provided in the axial direction such that the first phase coil and the second phase coil are disposed at respective ends the tubular body. A total number of coil windings of the third phase coils is set to be smaller than a total number of coil windings of the first phase coils and a total number of coil windings of the second phase coils.

Abstract: A linear motor has a tubular body and a rod that penetrates the tubular body in an axial direction, and is configured to displace the tubular body and the rod relative to each other in the axial direction. The linear motor includes: 12n+1 (where n is a positive integer) teeth arranged in the axial direction so as to project from an inner peripheral surface of the tubular body; 12n slots respectively formed between adjacent teeth of the plurality of teeth; 12n coils respectively disposed in the slots; and a plurality of permanent magnets held in the rod so as to be arranged in the axial direction. The respective coils are formed by being wound around an axis of the rod in an identical direction, and the number of permanent magnets positioned in the tubular body is set to 8n.

Abstract: A linear motor includes a hollow cylindrical core, a shaft having a shape of a cylindrical tube, and a sleeve. A plurality of coils are arranged at axial intervals at the inner circumferential side of the core. A plurality of permanent magnets are arranged at axial intervals in the shaft. The shaft is axially movable inside the core. The sleeve is formed from a non-magnetic element, and disposed between the core and the shaft over the entire length of the core.

Abstract: A linear motor has a tubular body and a rod that penetrates the tubular body in an axial direction, and is configured to displace the tubular body and the rod relative to each other in the axial direction. The linear motor includes: 12n+1 (where n is a positive integer) teeth arranged in the axial direction so as to project from an inner peripheral surface of the tubular body; 12n slots respectively formed between adjacent teeth of the plurality of teeth; 12n coils respectively disposed in the slots; and a plurality of permanent magnets held in the rod so as to be arranged in the axial direction. The respective coils are formed by being wound around an axis of the rod in an identical direction, and the number of permanent magnets positioned in the tubular body is set to 8n.

Abstract: A linear motor includes: an annular yoke; a rod that penetrates the yoke in a yoke axis direction; a plurality of teeth disposed at equal intervals in the yoke axis direction so as to project from an inner peripheral surface of the yoke; slots respectively formed between adjacent teeth of the plurality of teeth, a plurality of coils respectively disposed in the slots, and permanent magnets arranged and held in the rod in the yoke axis direction. The yoke is configured so that the slots are disposed repeatedly by a reference number determined in accordance with the number of phases of an alternating current passed through the coils, and a width adjusting unit configured to adjust a tooth width is provided in an Nth tooth from a yoke end, the Nth tooth being determined by Equation (1).

Abstract: A linear motor includes a tubular yoke and a rod that penetrates the yoke in an axial direction, and is configured to displace the yoke and the rod relative to each other in the axial direction. The linear motor includes a plurality of teeth arranged in the axial direction so as to project in a radial direction from an inner peripheral surface of the yoke, slots formed between adjacent teeth of the plurality of teeth, coils disposed respectively in the slots, and a plurality of permanent magnets held in the rod so as to be arranged in the axial direction. At least one of two slots positioned on outermost sides in the axial direction is configured such that a slow width thereof is narrower than the slot width of the remaining slots.

Abstract: A linear motor that displaces a tubular body and a rod relative to each other in an axial direction includes teeth arranged in the axial direction so as to project from an inner peripheral surface of the tubular body, slots formed between adjacent teeth, coils disposed in the slots, and permanent magnets provided in the rod and arranged in the axial direction. The coils are constituted by one or more first phase coils, one or more second phase coils, and one or more third phase coils. The first, second, and third phase coils are provided in the axial direction such that the first phase coil and the second phase coil are disposed at respective ends the tubular body. A total number of coil windings of the third phase coils is set to be smaller than a total number of coil windings of the first phase coils and a total number of coil windings of the second phase coils.

Abstract: A rotary electric machine capable of effectively utilizing both end faces of a rotor in the rotating axis direction by suppressing magnetic saturation comprises a stator having axial parts (31) and (32) and a radial part. The axial part (31) comprises cores (311) to (314) and coils (321) to (324), and the axial part (32) comprises cores (312) to (315) and coils (322) to (325). The radial part comprises cores (332) to (337) and coils (352) to (357). The width of each of the cores (311) to (315) in the circumferential direction is twice the width of each of the cores (332) to (337) in the circumferential direction. The number of windings of each of the coils (321) to (325) is equal to the number of windings of each of the coils (352) to (357).

Abstract: A rocking actuator and a laser machining apparatus which can suppress a temperature rise of a permanent magnet in a moving-magnet actuator. Even when a steerable mirror is positioned by rapid and continuous motions, highly reliable machining can be performed without degrading machining throughput or hole position accuracy. A cooling jacket for cooling a casing and heat transfer units brought into contact with a coil and the casing are provided. Heat generated in the coil is introduced to the casing through the heat transfer bypass units. Thus, the temperature rise of the coil is suppressed. Radial grooves are provided in the permanent magnet opposed to the coil so as to prevent an eddy current from appearing therein. Groove depth is made not smaller than skin depth expressed by a function of volume resistivity and permeability of the permanent magnet and a fundamental frequency of a current applied to the coil.

Abstract: A rotary electric machine capable of effectively utilizing both end faces of a rotor in the rotating axis direction by suppressing magnetic saturation comprises a stator having axial parts (31) and (32) and a radial part. The axial part (31) comprises cores (311) to (314) and coils (321) to (324), and the axial part (32) comprises cores (312) to (315) and coils (322) to (325). The radial part comprises cores (332) to (337) and coils (352) to (357). The width of each of the cores (311) to (315) in the circumferential direction is twice the width of each of the cores (332) to (337) in the circumferential direction. The number of windings of each of the coils (321) to (325) is equal to the number of windings of each of the coils (352) to (357).

Abstract: A rocking actuator and a laser machining apparatus which can suppress a temperature rise of a permanent magnet in a moving-magnet actuator. Even when a steerable mirror is positioned by rapid and continuous motions, highly reliable machining can be performed without degrading machining throughput or hole position accuracy. A cooling jacket for cooling a casing and heat transfer units brought into contact with a coil and the casing are provided. Heat generated in the coil is introduced to the casing through the heat transfer bypass units. Thus, the temperature rise of the coil is suppressed. Radial grooves are provided in the permanent magnet opposed to the coil so as to prevent an eddy current from appearing therein. Groove depth is made not smaller than skin depth expressed by a function of volume resistivity and permeability of the permanent magnet and a fundamental frequency of a current applied to the coil.

Abstract: A maleic anhydride copolymer comprising maleic anhydride units (I), conjugated diene units (II) and aliphatic monoolefin units (III) is provided. This copolymer has a weight-average molecular weight of from 500 to 50000. The molar ratio of unit (I)/(unit (II)+unit (III)) ranges from 30/70 to 90/10 and the molar ratio of unit (II)/unit (III) ranges from 5/95 to 90/10. A hydrolyzed product of the copolymer or a water-soluble maleic acid copolymer is also provided. The hydrolyzed product is advantageously used for scale inhibitors, dispersants for calcium carbonate or admixtures for cement and conctrete.