Armature of linear motor
An armature of a linear motor includes a plurality of first magnetic teeth and a plurality of second magnetic teeth, each of the magnetic teeth being formed by laminating multiple tooth elements made of electromagnetic steel sheets. The first magnetic teeth are arranged side by side in a linear form while the second magnetic teeth are located one each between the successive first magnetic teeth. Each of the second magnetic teeth interconnects the two adjacent first magnetic teeth located on both sides.
1. An armature of a linear motor including a plurality of magnetic teeth wound by driving coils, said magnetic teeth comprising:
a plurality of first magnetic teeth arranged side by side in a linear form, each of the first magnetic teeth having a yoke portion and a tooth portion extending from the yoke portion toward a stator of the linear motor, each of the first magnetic teeth has an end surface and a connecting part; and
a plurality of second magnetic teeth each located between the tooth portions of each successive pair of adjacent first magnetic teeth, each of the second magnetic teeth joining the two adjacent first magnetic teeth located on both sides thereof,
wherein the end surfaces of the successive first magnetic teeth are held in face-to-face contact and the successive first magnetic teeth are joined to one another as the connecting parts of each successive pair of adjacent first magnetic teeth are connected by the second magnetic tooth located between the adjacent first magnetic teeth.
2. The armature of the linear motor according to claim 1 , wherein the end surface of the first magnetic teeth is a vertical end surface and the connecting part is projecting downward from the vertical end surface on each side of the yoke portion while each of the second magnetic teeth has a dovetail groove-shaped connecting part, and wherein the vertical end surfaces of the successive first magnetic teeth are held in face-to-face contact and the successive first magnetic teeth are joined to one another as the projecting connecting parts of each successive pair of adjacent first magnetic teeth are fitted into the dovetail groove-shaped connecting part formed in the second magnetic tooth located between the adjacent first magnetic teeth.
3. The armature of the linear motor according to claim 2 , wherein each of the first magnetic teeth has a cutout formed in each side of the yoke portion, and wherein an end of each of the second magnetic teeth in which the dovetail groove-shaped connecting part is formed is inserted into the cutout.
4. The armature of the linear motor according to claim 2 , wherein there is provided a connecting part positioner having a protruding shape at the bottom of the dovetail groove-shaped connecting part formed in each of the second magnetic teeth so that the connecting part positioner forces the projecting connecting parts of each successive pair of adjacent first magnetic teeth to inner side walls of the dovetail groove-shaped connecting part.
5. The armature of the linear motor according to claim 4 , wherein an end of each second magnetic tooth facing the stator is recessed from ends of the adjacent first magnetic teeth facing the stator.
6. The armature of the linear motor according to claim 2 , wherein a groove is formed in one vertical end surface of the yoke portion of each first magnetic tooth and a protrusion is formed on the opposite vertical end surface of the yoke portion, and wherein the protrusion formed on the yoke portion of each first magnetic tooth fits into the groove formed in the yoke portion of the adjacent first magnetic tooth.
7. The armature of the linear motor according to claim 1 , wherein driving coils are wound on one of the groups of the first magnetic teeth and of the second magnetic teeth.
8. The armature of the linear motor according to claim 1 , wherein the successive first magnetic teeth are bendably joined in a chainlike form by flexible joints.