Electric actuator
First Claim
1. An electric actuator for providing an angular reciprocating drive, comprising:
- a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles;
the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft, wherein each magnet has opposite ends and extends substantially parallel to the shaft, and the magnets are secured on the shaft by a pair of mounting members surrounding respective opposite ends of the magnets;
the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.
1 Assignment
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Accused Products
Abstract
An electric actuator for providing an angular reciprocating drive, comprising a casing, a stator housed in the casing, and an armature extending co-axially through the stator. The stator has an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles. The armature has a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft. The magnets have proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.
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Citations
21 Claims
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1. An electric actuator for providing an angular reciprocating drive, comprising:
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a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles;
the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft, wherein each magnet has opposite ends and extends substantially parallel to the shaft, and the magnets are secured on the shaft by a pair of mounting members surrounding respective opposite ends of the magnets;
the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 17)
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14. An electric actuator for providing an angular reciprocating drive, comprising:
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a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles, wherein the poles are divided into two groups each of alternating poles, and the stator includes a pair of ferromagnetic annular members located at opposite ends thereof, each member being connected to a respective group of alternating poles for magnetisation in the same polarity;
the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft;
the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive. - View Dependent Claims (15)
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16. An electric actuator for providing an angular reciprocating drive, comprising:
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a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles, the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft, the armature including a torsion spring biassing the shaft into a neutral angular position relative to the casing, across which neutral position the shaft is to oscillate, wherein the poles and the magnets are arranged in such a manner that each magnet is positioned symmetrically between a corresponding pair of poles when the shaft is in the neutral position;
the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.
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18. An electric actuator for providing an angular reciprocating drive, comprising:
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a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles, the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft, the armature including a torsion spring biassing the shaft into a neutral angular position relative to the casing, across which neutral position the shaft is to oscillate, wherein the spring has a first end engaged with a fixed member on the shaft and a second end engaged with an end cap of the casing and wherein the fixed member comprises an eccentric weight mounted fast on the shafts;
the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.
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19. An electric actuator for providing an angular reciprocating drive, comprising:
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a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles, the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft, wherein the armature includes an eccentric weight mounted fast on the shaft;
the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive. - View Dependent Claims (20)
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21. An electric actuator for providing an angular reciprocating drive, comprising:
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a casing;
a stator housed in the casing; and
an armature extending co-axially through the stator;
the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles;
the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft;
the magnets having proximal sides as between adjacent magnets of opposite polarities, the adjacent magnets each having opposite sides of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.
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Specification