Linear motor
First Claim
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1. A linear motor comprising:
- a stator; and
an armature that faces the stator in a first direction with a gap therebetween, whereinthe stator has an elongated shape extending in a longitudinal direction that is orthogonal to the first direction in which the stator faces the armature, and includes a plurality of salient poles that extend in a width direction that is orthogonal to both the first direction and the longitudinal direction, the plurality of salient poles are arranged along the longitudinal direction of the stator and protrude toward the armature, andthe armature includesan armature core including a tooth that protrudes toward the stator,an armature winding wound around the tooth,a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, anda magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles,wherein the magnetic-field sensor is disposed beyond an outer side of the plurality of permanent magnets in the width direction, andwherein the magnetic-field sensor has a surface that overlaps in a direction parallel to the first direction with an upper surface of a salient pole of the plurality of salient poles when the magnetic-field sensor is aligned with the salient pole in the longitudinal direction.
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Abstract
A linear motor includes a stator and an armature that faces the stator with a gap therebetween. The stator has an elongated shape extending so as to cross a direction in which the stator faces the armature, and includes a plurality of salient poles that are arranged along a longitudinal direction of the stator and protrude toward the armature. The armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles.
7 Citations
14 Claims
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1. A linear motor comprising:
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a stator; and an armature that faces the stator in a first direction with a gap therebetween, wherein the stator has an elongated shape extending in a longitudinal direction that is orthogonal to the first direction in which the stator faces the armature, and includes a plurality of salient poles that extend in a width direction that is orthogonal to both the first direction and the longitudinal direction, the plurality of salient poles are arranged along the longitudinal direction of the stator and protrude toward the armature, and the armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles, wherein the magnetic-field sensor is disposed beyond an outer side of the plurality of permanent magnets in the width direction, and wherein the magnetic-field sensor has a surface that overlaps in a direction parallel to the first direction with an upper surface of a salient pole of the plurality of salient poles when the magnetic-field sensor is aligned with the salient pole in the longitudinal direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A linear motor comprising:
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a stator; and an armature that faces the stator in a first direction with a gap therebetween, wherein the stator has an elongated shape extending in a longitudinal direction that is orthogonal to the first direction in which the stator faces the armature, and includes a plurality of salient poles that extend in a width direction that is orthogonal to both the first direction and the longitudinal direction, the plurality of salient poles are arranged along the longitudinal direction of the stator and protrude toward the armature, and the armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles, wherein the magnetic-field sensor has a surface that overlaps in a direction parallel to the width direction with an outer side surface of a salient pole of the plurality of salient poles when the magnetic-field sensor is aligned with the salient pole in the longitudinal direction.
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11. A linear motor comprising:
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a stator; and an armature that faces the stator in a first direction with a gap therebetween, wherein the stator has an elongated shape extending in a longitudinal direction that is orthogonal to the first direction in which the stator faces the armature, and includes a plurality of salient poles that extend in a width direction that is orthogonal to both the first direction and the longitudinal direction, the plurality of salient poles are arranged along the longitudinal direction of the stator and protrude toward the armature, the armature includes an armature core including a plurality of teeth that protrude toward the stator, a plurality of armature windings that are respectively wound around the plurality of teeth and that respectively receive alternating currents of a plurality of phases, a plurality of permanent magnets disposed on end sides of the plurality of teeth so as to be arranged along the longitudinal direction of the stator, and a plurality of magnetic-field sensors that detect a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles, at least one magnetic-field sensor of the plurality of magnetic-field sensors is arranged for each of the respective phases of the alternating currents, and the at least one magnetic-field sensor is disposed beyond an outer side of the plurality of permanent magnets in the width direction. - View Dependent Claims (12, 13, 14)
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Specification
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Current AssigneeKabushiki Kaisha Yaskawa Denki
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Original AssigneeKabushiki Kaisha Yaskawa Denki
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InventorsMakino, Shogo, Ohto, Motomichi, Arinaga, Yuji
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Primary Examiner(s)LE, DANG D
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Application NumberUS14/311,351Publication NumberTime in Patent Office610 DaysField of SearchUS Class Current1/1CPC Class CodesH02K 29/08 using magnetic effect devic...H02K 41/03 Synchronous motors; Motors ...H02K 41/031 of the permanent magnet typeH02K 41/033 with armature and magnets o...
