Actuator, method of manufacturing the actuator and circuit breaker provided with the actuator
First Claim
1. An actuator comprising:
- a fixed iron core unit including first, second, third, and fourth iron cores, the first iron core having a closed core portion and groovelike channels between the closed core portion, and a pair of projecting portions extending inward from opposite sides of the closed core portion along an x-axis direction of a Cartesian coordinate system defined by x-, y- and z-axes of the closed core portion, the second iron core having a closed core portion, and the third and fourth iron cores individually having split core portions, in which the closed core portions of the first and second iron cores are placed, face-to-face, at a fixed distance from each other along a y-axis direction of the Cartesian coordinate system so that the first and second iron cores overlap each other as viewed along the y-axis direction, the third and fourth iron cores are placed face-to-face with each other, along the x-axis direction, between the first and second iron cores so that the split core portions of the third and fourth iron cores together constitute a central closed core portion which overlaps the closed core portions of the first and second iron cores as viewed along the y-axis direction, and the closed core portions of the first and second iron cores and the central closed core portion formed by the split core portions of the third and fourth iron cores together form and surround an armature accommodating space;
an armature unit including an armature made of a magnetic material and first and second rod members attached to the armature; and
a coil including a bobbin and a winding wound around the bobbin, the bobbin having projections extending along a z-axis direction of the Cartesian coordinate system, wherein the coil is fitted in the groove like channels in the first iron core, preventing the coil from being displaced along the x- and z-axis directions, the projections of the bobbin are sandwiched between the first and second iron cores, from opposite sides along the y-axis direction, preventing the coil from being displaced along the y-axis, and the armature of the armature unit is accommodated in the armature accommodating space and supported movably along the z-axis direction by the first and second rod members which are fitted in bearings in the fixed iron core unit.
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Accused Products
Abstract
In an actuator, coils are kept from being displaced along a y-axis direction as projections of coil bobbins are sandwiched between first and second iron cores along the y-axis direction. Also, the coils are kept from being displaced excessively along x- and z-axis directions due to shocks, for instance, because they are fitted in groovelike channels fitted in the first and second iron cores. Since two bearings are sandwiched and fixed between third and fourth iron cores along the x-axis direction, the bearings can be easily set on a common axis with high accuracy. It is therefore possible to prevent displacement of the coils during operation of the actuator. Slidable support plates ensure smooth movements of an armature and thereby provide improved reliability, even when the distance between the support plates and the first to fourth iron cores is reduced.
28 Citations
17 Claims
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1. An actuator comprising:
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a fixed iron core unit including first, second, third, and fourth iron cores, the first iron core having a closed core portion and groovelike channels between the closed core portion, and a pair of projecting portions extending inward from opposite sides of the closed core portion along an x-axis direction of a Cartesian coordinate system defined by x-, y- and z-axes of the closed core portion, the second iron core having a closed core portion, and the third and fourth iron cores individually having split core portions, in which the closed core portions of the first and second iron cores are placed, face-to-face, at a fixed distance from each other along a y-axis direction of the Cartesian coordinate system so that the first and second iron cores overlap each other as viewed along the y-axis direction, the third and fourth iron cores are placed face-to-face with each other, along the x-axis direction, between the first and second iron cores so that the split core portions of the third and fourth iron cores together constitute a central closed core portion which overlaps the closed core portions of the first and second iron cores as viewed along the y-axis direction, and the closed core portions of the first and second iron cores and the central closed core portion formed by the split core portions of the third and fourth iron cores together form and surround an armature accommodating space;
an armature unit including an armature made of a magnetic material and first and second rod members attached to the armature; and
a coil including a bobbin and a winding wound around the bobbin, the bobbin having projections extending along a z-axis direction of the Cartesian coordinate system, wherein the coil is fitted in the groove like channels in the first iron core, preventing the coil from being displaced along the x- and z-axis directions, the projections of the bobbin are sandwiched between the first and second iron cores, from opposite sides along the y-axis direction, preventing the coil from being displaced along the y-axis, and the armature of the armature unit is accommodated in the armature accommodating space and supported movably along the z-axis direction by the first and second rod members which are fitted in bearings in the fixed iron core unit. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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2. An actuator comprising:
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a fixed iron core unit including first, second, third, and fourth iron cores, the first and second iron cores individually having closed core portions, and the third and fourth iron cores individually having split core portions, the third and fourth iron cores being placed face-to-face with each other along an x-axis direction of a Cartesian coordinate system defined by x-, y- and z-axes of the closed core portions, between the first and second iron cores so that the split core portions of the third and fourth iron cores together constitute a central closed core portion which overlaps the closed core portions of the first and second iron cores, as viewed along an y-axis direction of the Cartesian coordinate system, and the closed core portions of the first and second iron cores and the central closed core portion formed by the split core portions of the third and fourth iron cores together form and surround an armature accommodating space;
an armature unit including an armature made of a magnetic material and first and second rod members attached to the armature; and
bearings sandwiched between the split core portions of the third and fourth iron cores from opposite sides along the x-axis direction and held between the third and fourth iron cores, wherein the armature of the armature unit is accommodated in the armature accommodating space and supported movably along a z-axis direction of the Cartesian coordinate system by the first and second rod members, which are fitted in the bearings, and the armature is moved from a first position to a second position, and, vice versa, along the z-axis direction in response to excitation of a coil. - View Dependent Claims (3, 4, 5)
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Specification