Abstract: The present invention provides a cylinder-type linear motor capable of shortening the total motor length with respect to a predetermined stroke length and capable of being operated as a brushless DC motor without a sensor means for sensing the position of a moving part being added in the axial direction. The present invention also provides a moving part of said cylinder-type linear motor, which can improve the magnetic flux density distribution waveform near both end portions of the moving part assembly and can improve the thrust characteristic by bringing the magnetic flux density distribution waveform closer to a cosine waveform and by increasing the amplitude of cosine waveform.

Abstract: The present invention provides a cylinder-type linear motor capable of shortening the total motor length with respect to a predetermined stroke length and capable of being operated as a brushless DC motor without a sensor means for sensing the position of a moving part being added in the axial direction. The present invention also provides a moving part of said cylinder-type linear motor, which can improve the magnetic flux density distribution waveform near both end portions of the moving part assembly and can improve the thrust characteristic by bringing the magnetic flux density distribution waveform closer to a cosine waveform and by increasing the amplitude of cosine waveform.

Abstract: The present invention provides a cylinder-type linear motor capable of shortening the total motor length with respect to a predetermined stroke length and capable of being operated as a brushless DC motor without a sensor means for sensing the position of a moving part being added in the axial direction. The present invention also provides a moving part of said cylinder-type linear motor, which can improve the magnetic flux density distribution waveform near both end portions of the moving part assembly and can improve the thrust characteristic by bringing the magnetic flux density distribution waveform closer to a cosine waveform and by increasing the amplitude of cosine waveform.

Abstract: The present invention provides a cylinder-type linear motor capable of shortening the total motor length with respect to a predetermined stroke length and capable of being operated as a brushless DC motor without a sensor means for sensing the position of a moving part being added in the axial direction. The present invention also provides a moving part of said cylinder-type linear motor, which can improve the magnetic flux density distribution waveform near both end portions of the moving part assembly and can improve the thrust characteristic by bringing the magnetic flux density distribution waveform closer to a cosine waveform and by increasing the amplitude of cosine waveform.

Abstract: There is provided a cylinder-type linear motor capable of shortening the total motor length with respect to a predetermined stroke length S and capable of being operated without sensor means for sensing the position of a moving part being added in the axial direction. The cylinder-type linear motor includes a fixed part 20 having a coil assembly 28 formed by a plurality of (n number of) ring-shaped coils 22 . . . 27 arranged in the axial direction and a yoke member 21 made of a magnetic material, and a moving part 10 having a linear motion shaft 11 provided on the axis line of the fixed part 20 and a permanent magnet assembly 15 having one or more permanent magnets magnetized in the axial direction. A stroke S is equal to or smaller than (n×C?M), the axial length Y of the yoke member is set equal to or larger than (M+S+0.8×D), and the ring-shaped coils 22 . . . 27 are arranged in a predetermined phase order and the ring-shaped coils of the same phase are connected to each other to form one phase winding.

Abstract: The present invention provides a cylinder-type linear motor. The motor includes a fixed part including a coil assembly having a plurality of ring-shaped coils arranged in the axial direction to form a cylindrical space, and a yoke member made of a magnetic material, which is provided on the outer periphery side of the coil assembly and a moving part including a linear motion shaft provided on the axis line of the fixed part so as to be capable of reciprocating in the axial direction, and a permanent magnet assembly having one or more permanent magnets magnetized in the axial direction, which is provided on the linear motion shaft. The motor is characterized by when the axial length of the ring-shaped coil is taken as C, the axial length of the permanent magnet assembly as M, and the outside diameter thereof as D, a stroke S is equal to or smaller than (n×C?M), the axial length Y of the yoke member is set equal to or larger than (M+S+0.

Abstract: The present invention provides a cylinder-type linear motor. The motor includes a fixed part including a coil assembly having a plurality of ring-shaped coils arranged in the axial direction to form a cylindrical space, and a yoke member made of a magnetic material, which is provided on the outer periphery side of the coil assembly and a moving part including a linear motion shaft provided on the axis line of the fixed part so as to be capable of reciprocating in the axial direction, and a permanent magnet assembly having one or more permanent magnets magnetized in the axial direction, which is provided on the linear motion shaft. The motor is characterized by when the axial length of the ring-shaped coil is taken as C, the axial length of the permanent magnet assembly as M, and the outside diameter thereof as D, a stroke S is equal to or smaller than (n×C?M), the axial length Y of the yoke member is set equal to or larger than (M+S+0.

Abstract: A linear pulse motor includes a stator core manufactured easily and windings for phases disposed in the circumferential direction of the stator core and the length thereof is not lengthened in the shaft direction even when a multi-phase linear pulse motor is configured. The linear pulse motor includes a stator 1 having teeth 17 formed on an inner peripheral surface thereof in the shaft direction and a plurality of salient poles 11, 12, 13, . . . disposed at an equal pitch angle and a mover disposed movably in the shaft direction. A stator core 10 is formed by laminating stator iron plates 30 with the stator iron plates being rotated sequentially by a predetermined angle. When k is an integer larger than or equal to 1 and m is the number of phase, the stator iron plate includes k.multidot.m salient poles P1, P2, P3, . . . .

Abstract: A linear pulse motor includes a stator core manufactured easily and windings for phases disposed in the circumferential direction of the stator core and the length thereof is not lengthened in the shaft direction even when a multi-phase linear pulse motor is configured. The linear pulse motor includes a stator 1 having teeth 17 formed on an inner peripheral surface thereof in the shaft direction and a plurality of salient poles 11, 12, 13, . . . disposed at an equal pitch angle and a mover disposed movably in the shaft direction. A stator core 10 is formed by laminating stator iron plates 30 with the stator iron plates being rotated sequentially by a predetermined angle. When k is an integer larger than or equal to 1 and m is the number of phase, the stator iron plate includes k.multidot.m salient poles P1, P2, P3, . . .

Abstract: A combined linear-rotary stepping motor shares stator iron plates and mover iron cores for a linear motor portion and a rotary motor portion without lengthening the length in the shaft direction.The combined linear-rotary stepping motor includes a stator 1 having a stator iron core 10 provided with a plurality of salient poles 11, 12, 13, . . . composed of the salient poles having a plurality of first stator teeth 24 formed in inner peripheral surfaces thereof in the direction of a shaft 21 and the salient poles having a plurality of second stator teeth 25 formed in inner peripheral surfaces thereof in the circumferential direction and a mover 2 having mover iron cores 22a and 22b supported within the stator 1 movably in the shaft direction and rotatably and provided with a plurality of mover teeth 26 formed in outer peripheral surfaces thereof at an equal pitch in the shaft direction and the circumferential direction in opposing relation to the first and second stator teeth 24, 25.

Abstract: An iron core of a multi-phase linear motor which is not restricted by the shape of the motor is manufactured. A stator 1 and a mover 2 are disposed opposite to each other and are separated by an air gap. In manufacturing of the iron core of the multi-phase linear motor having a multiplicity of teeth 16 formed on surfaces of a plurality of salient poles P1, P2, . . . disposed in the stator 1 or the motor 2, the stator iron core 10 or mover iron cores 22a and 22b are formed by punching iron plates 30a, 30b, . . . forming the iron core by a punching mold 31 while selectively controlling actuation and withdrawal of movable punches 33 included in the punching mold 31 and disposed so as to be actuable and withdrawable toward and away from the salient poles so that the tips of the salient poles P1, P2, . . . form tooth tops 16a or tooth bottoms 16b of the teeth 16 at a predetermined period for each punching of the iron plates and by laminating the punched iron plates successively.

Abstract: A linear motor is operated as an m-phase linear pulse motor or a brushless DC linear motor capable of producing large driving force. The linear motor includes an even number N of salient poles 11, 12, . . . disposed at an equal pitch angle and includes a stator 1 having a plurality of permanent magnet poles disposed on inner peripheral surfaces of the salient poles to have polarities different from each other in the shaft direction and a mover 3 disposed movably in the shaft direction. The salient poles are constituted by pairs of the salient poles adjacent to each other and include m sets of salient pole groups each composed of (N/m) salient poles disposed at an angle of (720 m/N) degrees and windings W1, W2, . . .

Abstract: A linear motor includes a stator 1 having an even number N of salient poles 11, 12, . . . disposed at an equal angle pitch and a mover 3 disposed movably in a shaft direction. The salient poles are constituted by pairs of salient poles adjacent to each other and including m sets of salient pole groups composed of (N/2m) sets of salient pole pairs disposed at an angle of (720m/N) degrees. Windings W1, W2, . . . wound on (N/m)-1 or (N/m)-2 salient poles belonging to each of the salient pole groups are connected to have opposite polarities between the pair of salient poles and are connected to have the same polarity between the salient poles which do not constitute the pair of salient poles and are disposed to interpose the salient pole of the other phase therebetween to constitute phase windings for m phases. Remaining salient poles of the salient pole group are caused to detect a position and a movement direction of the mover 3 as sensor poles S.sub.A and S.sub.B.

Abstract: It is an object of the present invention to provide a linear pulse motor capable of being configured even if the number of salient poles of a stator is odd and having increased ampere-conductors of a winding and large driving force. The linear pulse motor includes a stator having a plurality of salient poles 11, 12, . . . 15 disposed at equal pitch angle and having an inner peripheral surface on which teeth 16 are formed in the direction of a shaft 16, and a mover 2 disposed movably in the shaft direction. A stator core 10 includes stator iron plates 30 laminated while rotated successively by the equal pitch angle of the salient poles. When k is an integer equal to or larger than 1, m is the number of phases, and n is equal to or smaller than m/2 and nearest to m/2, the stator iron plates 30 has km salient poles P1, P2, . . . P5.

Abstract: A linear pulse motor of the present invention comprises a stator core 10 having salient poles with teeth in the axial direction on the inner peripheral surface, stator windings W2 and W4 wound around each salient pole, and a mover which can move freely in the axial direction in the stator. The mover includes magnetic pole blocks 22 and 34 having teeth in the axial direction on the outer peripheral surface thereof and a permanent magnet 40 magnetized to a predetermined polarity. The aforesaid two magnetic pole blocks are arranged in an opposed relationship with respect to each salient pole via a circumferential gap. The magnetic pole block is magnetized to different polarity from each other by the permanent magnet disposed in the mover core. When the tooth tops of one magnetic pole block are opposed to the tooth tops of the salient pole, the tooth tops of the other magnetic pole block are opposed to the tooth bottoms of the salient pole.

Abstract: It is an object of the present invention to provide a linear pulse motor which can increase the number of ampere conductors and attain a multi-phase configuration with a uniform magnetic circuit without increasing the length in the axial direction. The linear pulse motor includes a stator composed of two stator cores having 2.multidot.k.multidot.m salient poles disposed radially in an inner peripheral surface, a permanent magnet held between the stator cores and having a thickness such that a distance between centers of small stator teeth is (N+0.5) times of a tooth pitch and stator windings wound to bestride two salient poles of the stator cores, and a mover including a cylindrical core. Small teeth in the form of ring are disposed in the mover or the stator at equal pitch in the axial direction and small teeth disposed in the axial direction are formed of laminated stator iron plates or mover iron plates each rotated by {(360.multidot.n)/(2.multidot.k.multidot.m)} degrees.

Abstract: A three-phase hybrid type stepping motor includes a stator having 12 salient poles 1.sub.1, 1.sub.2, 1.sub.3, . . . , 1.sub.11, 1.sub.12. The stator salient poles having the number a of stator teeth 3 and those having the number (a+1) of stator teeth are disposed alternately and a pitch .tau..sub.s1 of the number a of stator teeth and a pitch .tau..sub.s2 of the number (a+1) of stator teeth satisfy the relation of .tau..sub.s1 .gtoreq..tau..sub.s2. A pitch angle formed by central lines of the salient poles and the stator teeth disposed in the salient poles is an equal pitch of 30 degrees and the number Z.sub.R of rotor teeth being given by Z.sub.R =12n.+-.2 or Z.sub.R =12n.+-.4 (where the numbers a and n are integers equal to or larger than 1). The three-phase stepping motor has excellent characteristics in vibration, resolution and high-speed operation as compared with a two-phase stepping motor and its driving circuit can be made simple and low-cost in manufacturing.

Abstract: A four-phase hybrid type stepping motor is disclosed, which comprises a rotor and eight stator poles each formed on a plane facing to an outer side surface of the rotor with a plurality of stator teeth, wherein a pitch between a center of the stator teeth of the first one of the eight stator poles and a center of the stator teeth of the fourth stator pole, a pitch between the center of the stator teeth of the fourth stator pole and a center of the stator teeth of the seventh stator pole and a pitch between the center of the stator teeth of the seventh stator pole and a center of the stator teeth of the second stator pole are common and equal to .tau..sub.c defined as follows: ##EQU1## where Z.sub.R is the number of the rotor teeth and N is an integer close to 3.multidot.Z.sub.R /8.