Patent Number: 046648682
Section: description

DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below in conjunction with FIGS. 7 and 8, wherein reference numeral 1 denotes a toroidal coil. A bridge portion R off the straight portion of the coil is elongated in the radial direction, and coil support frames 5a, 5b containing the toroidal coil 1 also have shapes along the portion R that is off the straight portion of the toroidal coil 1. Reference numeral 11 denotes a reinforcing member that is welded to wedge-like coupling portions 5c of the coil support frames 5a, 5b, which is formed by grinding a thick plate, or by forging. The reinforcing member 11 is located at the portion R off the straight portions of coil support frames 5a, 5b that is, the portions of the frames bridging the opposite ends of the straight portions to the curved portions thereof; and has such a structure that the wedge-like coupling portions 5c are stretched in the radial direction. The reinforcing member 11 further has opposing keyways 11a, 11b in the oppositing surfaces of adjacent reinforcing members; for coupling the coil support frames 5a, 5b, and spaces 11c behind wall portions of the reinforcing members for fastening the coil support frames 5a, 5b. The keyway 11a is wide, the keyway 11b is narrow, and the pair of these keyways constitute a stepped keyway. Reference numeral 12 denotes a key inserted in the key grooves 11a, 11b to couple the coil support frames 5a, 5b together, and is formed in a stepped shaped. Reference numeral 13 denotes bolts which are screwed into the wall portions of reinforcing member 11 and into the spaces 11c to rigidly fasten the coil support frames 5a, 5b together. The operation of the toroidal coil apparatus according to the present invention will be described herebelow. A plurality of toroidal coils 1 are positioned in a radial manner directly on the rack 7, the wedge surfaces of wedge-like coupling portions 5c of coil support frames 5a, 5b are intimately wedged together, and a force is applied from the back side of the coils by hydraulic jacks, such that the centripetal force is correctly received via the wedge surfaces. Under this condition, the key 12 is inserted in the keyways 11a, 11b to couple the neighboring coil support frames 5a, 5b together. This eliminates slippage between the coil support frames 5a, 5b. The neighboring coil support frames 5a, 5b are then rigidly secured by bolts 13. The above-mentioned operation is effected successively in the torus direction to firmly support the toroidal coils 1. With the thus constructed toroidal apparatus, the wedgelike coupling portions 5c of the coil support frames 5a, 5b establish a construction that extends in the radial direction due to the reinforcing members 11. Further, owing to the bonding force and fastening force by the keys 12 and bolts 13, the straight portions of coils are more firmly secured than those of the conventional art and, further, the same effect is obtained as when inversion preventing beams are provided in the vicinity of portions off the straight portion of the coil. Accordingly, the inverting force F.sub.Q can be strikingly reduced. Since the inverting force F.sub.Q is reduced, the stress can also be reduced in the vicinities of straight portions of the coils. Although the above embodiment has described the case in which the reinforcing members 11 are arranged between the coil support frames 5a, the reinforcing members 11 can also be arranged in the upper portion or the lower portion of the coil support frames 5a to obtain the same effects. According to the present invention as described in the foregoing, reinforcing members having keyways and spaces are provided at portions off the straight portions of the coil support frames to couple and fasten the coil support frames, wherein keys are inserted in the keyways to couple the coil support frames, and the coil support frames are rigidly secured by bolts. It is therefore possible to decrease the stress that results from the inverting force.