Linear motor, driving and control system thereof and manufacturing method thereof

Claim 2

A linear motor comprising: a first member; and a second member; wherein said first member includes a core having first portions opposed to each other through a first gap and a core having second portions opposed to each other through a second gap, wherein the magnetic polarity of said first portions, and the magnetic polarity of said second portions are different, said core having first portions and said core having second portions are arranged alternately, said second member is arranged in said first gap and said second gap, and said core having first portions and said core having second portions include a common coil.

Claim 3

A linear motor according to claim 1 , wherein said first member is made of an iron core and a winding, and said second member is made of a permanent magnet, a magnetic material and a winding of a single type or a combination of a plurality of types of materials.

Claim 4

A linear motor according to claim 1 , wherein said first member is made of an iron core, a permanent magnet and a winding, and said second member is made of a permanent magnet, a magnetic material, a winding of a single type or a combination of a plurality of types of materials.

Claim 5

A linear motor according to claim 2 , wherein said permanent magnet and said ferromagnetic material of said second member are arranged in skewed fashion.

Claim 6

A linear motor according to claim 1 , wherein said linear motor wherein said first member is wound with a single excitation winding and the direction of the current flow is switched alternately by a drive circuit.

Claim 7

A linear motor according to claim 1 , wherein two windings are wound in opposite directions on the same iron core of said first member, and the current in the same direction is supplied to the alternate windings by a drive circuit.

Claim 8

A linear motor according to claim 1 , wherein a plurality of first members are arranged, and assuming that said pole pitch is given as P, the pitch between the magnetic pole teeth of adjacent ones of said first members is expressed as (k·P+P/M) {k: 0, 1, 2, . . . , and M: 2, 3, 4, . . . . }, where k is the number freely selectable within the range in which adjacent first members can be arranged, and M is the number of phases of said motor.

Claim 9

A linear motor according to claim 1 , wherein a plurality of first members are arranged, and assuming that a multiplicity of first members represent one phase and the pole pitch is given as P, the pitch between the magnetic pole teeth of adjacent ones of said first members of the same phase is expressed as (k·P) {k: 0, 1, 2, . . . , }, and the pitch of the magnetic pole teeth of adjacent ones of said first members of different phases is expressed as (k·P+P/M) {k: 0, 1, 2, . . . , and M: 2, 3, 4, . . . }, where k is the number freely selectable within the range in which adjacent first members can be arranged, and M is the number of phases of said motor.

Claim 10

A linear motor according to claim 1 , comprising a support mechanism for supporting said second member moving relatively in a gap of said first member.

Claim 11

A linear motor according to claim 1 , comprising an armature formed of a magnetic material having two poles, a coil wound on said armature and a mover movable relatively to said armature by acting on a magnetic field generated by said armature, said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover, and a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover, wherein the magnetic pole teeth in said first stage of said first magnetic pole tooth train and the magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover, wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover, and wherein said mover is arranged between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 12

A linear motor according to claim 10 , wherein a plurality of armature units each including said armature, said coil and said first and second magnetic pole tooth trains are arranged, and assuming that the pole pitch is given as P, the pitch of the magnetic pole tooth trains of adjacent ones of said armature units is expressed as (k·P+P/M) {k: 0, 1, 2, . . . , and M: 2, 3, 4, . . . }, where k is the number freely selectable within the range in which adjacent armature units can be arranged, and M is the number of phases of said motor.

Claim 13

A linear motor according to claim 10 , wherein a plurality of armature units each including said armature, said coil and said first and second magnetic pole tooth trains are arranged, and assuming that a multiplicity of armature units represent one phase and the pole pitch is given as P, the pitch of the magnetic pole tooth trains of adjacent ones of said armature units of the same phase is expressed as (k·P) {k: 0, 1, 2, . . . }, and the pitch of the magnetic pole tooth trains of adjacent ones of said armature units of different phases is expressed as (k·P+P/M) {k: 0, 1, 2, . . . , and M: 2, 3, 4, . . . }, where k is the number freely selectable within the range in which adjacent armature units can be arranged, and M is the number of phases of said motor.

Claim 14

A linear motor according to claim 10 , wherein the pitch of the magnetic pole tooth trains of said armature unit including said armature, said coil and said first and second magnetic pole tooth trains assumes a value identical to or different from the pitch of the magnetic poles of said mover.

Claim 15

A linear motor according to claim 1 , wherein the pitch of the magnetic poles of said first member and the pitch of the magnetic poles of said second member have the same value.

Claim 16

A linear motor according to claim 1 , wherein the relative position in the direction perpendicular to the direction of relative movement of said first member is held by the interaction between the first member and the second member.

Claim 17

A linear motor according to claim 15 , wherein the first member is made of an iron core and a winding, and the second member is made of a permanent magnet, a magnetic material and a winding of a single type of material or a combination of a plurality of types of materials.

Claim 18

A linear motor according to claim 15 , wherein the first member is made of an iron core, a permanent magnet and a winding, and the second member is made of a permanent magnet, a magnetic material, a winding of a single type of material or a combination of a plurality of types of materials.

Claim 19

A linear motor according to claim 15 , wherein the permanent magnet or the ferromagnetic material of the second member is arranged in skewed fashion.

Claim 20

A linear motor comprising: a first member; and a second member; wherein said first member includes a core having first portions opposed to each other through a first gap and a core having second portions opposed to each other through a second gap, wherein the magnetic polarity of said first portions, and the magnetic polarity of said second portions are different, said core having first portions and said core having second portions are arranged alternately, said second member is arranged in said first gap and said second gap, and said core having first portions and said core having second portions include a common coil, wherein a pitch of magnetic poles of said first member and a pitch of magnetic poles of said second member assume different values.

Claim 21

A linear motor comprising: a first member; and a second member; wherein said first member includes a core having first portions opposed to each other through a first gap and a core having second portions opposed to each other through a second gap, wherein the magnetic polarity of said first portions, and the magnetic polarity of said second portions are different, said core having first portions and said core having second portions are arranged alternately, said second member is arranged in said first gap and said second gap, and said core having first portions and said core having second portions include a common coil, wherein a pitch of magnetic poles of said first member and a pitch of magnetic poles of said second member assume different values.

Claim 22

A linear motor comprising a first member formed of a magnetic material, a coil wound on said first member and a second member acting on a magnetic field generated by said first member, said second member being fixedly supported, said first member being movable relatively, said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said first member and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said first member, and a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said first member and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said first member; wherein said magnetic pole teeth in said first stage of said first magnetic pole tooth train and said magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said first member, wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said first member, and wherein said second member is arranged between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 23

A linear motor comprising a first member formed of a magnetic material, a coil wound on said first member and a second member acting on a magnetic field generated by said first member, said second member being fixedly supported, said first member being movable relatively, said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said first member and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said first member, and a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said first member and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said first member; wherein said magnetic pole teeth in said first stage of said first magnetic pole tooth train and said magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said first member, wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said first member, and wherein said second member is arranged between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 24

A linear motor driving system comprising a closed loop control system including: a linear motor includes an armature of magnetic material having two poles; a coil wound on said armature; a mover movable relatively to said armature; a sensor for detecting the relative displacement of said mover to said armature; a control unit for feeding back the signal from said sensor; and said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; wherein the magnetic pole teeth in said first stage of said first magnetic pole tooth train and the magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; and wherein said mover is arranged between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 25

A linear motor driving system comprising a closed loop control system including: a linear motor includes an armature of magnetic material having two poles; a coil wound on said armature; a mover movable relatively to said armature; a sensor for detecting the relative displacement of said mover to said armature; a control unit for feeding back the signal from said sensor; and said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; wherein the magnetic pole teeth in said first stage of said first magnetic pole tooth train and the magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; and wherein said mover is arranged between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 26

A linear motor driving system comprising an open loop control system including: a linear motor includes an armature of magnetic material having two poles; a coil wound on said armature; a mover movable relatively to said armature; and said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; wherein the magnetic pole teeth in said first stage of said first magnetic pole tooth train and the magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; and wherein said mover is arrange between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 27

A linear motor driving system comprising an open loop control system including: a linear motor includes an armature of magnetic material having two poles; a coil wound on said armature; a mover movable relatively to said armature; and said linear motor further comprising: a first magnetic pole tooth train magnetically coupled to one magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; a second magnetic pole tooth train magnetically coupled to an other magnetic pole of said armature and arranged in first and second stages in the direction substantially perpendicular to the direction of movement of said mover; wherein the magnetic pole teeth in said first stage of said first magnetic pole tooth train and the magnetic pole teeth in said first stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; wherein said magnetic pole teeth in said second stage of said first magnetic pole tooth train and said magnetic pole teeth in said second stage of said second magnetic tooth train are arranged alternately along the direction of movement of said mover; and wherein said mover is arrange between said first and second magnetic pole tooth trains in said first stage and said first and second magnetic pole tooth trains in said second stage.

Claim 28

A linear motor driving system according to claim 21 , comprising a control system including: a linear motor including said armature and said mover; a power drive unit; and a control unit including means for detecting the induced voltage of the linear motor and estimating the relative positions of the magnetic poles of said armature and said mover based on said voltage detection value.

Claim 29

A linear motor driving system according to claim 21 , comprising a control system including: a linear motor including said armature and said mover; a power drive unit; and a control unit including means for detecting the current flowing in said linear motor and estimating the relative positions of the magnetic poles of said armature and said mover based on said current detection value.

Claim 30

A linear motor comprising: a first member; and a second member; wherein said first member includes a first core having a first upper portion and a first lower portion opposed to each other through a first gap, and a second core having a second upper portion and a second lower portion opposed to each other through a second gap, wherein a magnetic polarity of said first upper portion is different from a magnetic polarity of said first lower portion, and a magnetic polarity of said second upper portion is different from a magnetic polarity of said second lower portion, said first core and said second core being arranged alternately, said second member being arranged in said first gap and said second gap, and said first core and said second core include a common coil.

Claim 31

A linear motor comprising: a first member; and a second member; wherein said first member includes a first core having a first upper portion and a first lower portion opposed to each other through a first gap, and a second core having a second upper portion and a second lower portion opposed to each other through a second gap, wherein a magnetic polarity of said first upper portion is different from a magnetic polarity of said first lower portion, and a magnetic polarity of said second upper portion is different from a magnetic polarity of said second lower portion, said first core and said second core being arranged alternately, said second member being arranged in said first gap and said second gap, and said first core and said second core include a common coil.

Claim 32

A linear motor according to claim 25 , wherein a plurality of windings are wound in opposite directions on said first and said second core of said first member, and current in a same direction is supplied to alternate windings by a drive circuit.

Claim 33

A linear motor according to claim 25 , wherein a relative position in a direction perpendicular to a direction of relative movement of said first member is held by an interaction between said first member and said second member.

Claim 34

A linear motor comprising: a first member; and a second member; wherein said first member includes a first core having a first upper portion and a first lower portion opposed to each other through a first gap, and a second core having a second upper portion and a second lower portion opposed to each other through a second gap, wherein a magnetic polarity of said first upper portion is different from a magnetic polarity of said first lower portion, and a magnetic polarity of said second upper portion is different from a magnetic polarity of said second lower portion, said first core and said second core being arranged alternately, said second member being arranged in said first gap and said second gap, and said first core and said second core include a common coil, wherein a pitch of magnetic poles of said first member and a pitch of magnetic poles of said second member assume different values.

Claim 35

A linear motor comprising: a first member; and a second member; wherein said first member includes a first core having a first upper portion and a first lower portion opposed to each other through a first gap, and a second core having a second upper portion and a second lower portion opposed to each other through a second gap, wherein a magnetic polarity of said first upper portion is different from a magnetic polarity of said first lower portion, and a magnetic polarity of said second upper portion is different from a magnetic polarity of said second lower portion, said first core and said second core being arranged alternately, said second member being arranged in said first gap and said second gap, and said first core and said second core include a common coil, wherein a pitch of magnetic poles of said first member and a pitch of magnetic poles of said second member assume different values.