A magnetic pump having an internal magnet that is caused to rotate from outside its housing in order to cause rotation of the impeller. In a magnetic coupling structure in which an inner magnet disposed on an impeller is accommodated in a cylindrical accommodating portion of the housing,Magnetic pumps the outer circumferential surface of this accommodating portion is loosely inserted into the inner circumferential surface of a cylindrical outer magnet which is supported on its outer circumferential surface by a magnet cup body, and which rotates together with this magnet cup body, and the impeller rotates in accordance with the rotation of the outer magnet, Vacuum pumpsand a cylindrical covering member which covers the inner circumferential surface of the abovementioned outer magnet is mounted on the outer magnet. An inner magnet rotor for a magnet pump includes a yoke, magnets arranged on the yoke, a first holder, affixed to the yoke, for tightly holding the magnets at the front side of the yoke, and a second holder, affixed to the yoke for tightly holding the magnets at the rear side of the yoke. The first and second holders are lower in hardness than the magnets, and the magnets are chamfered at each of their front and rear ends to form a bevel face. Each of the first and second holders are formed with a slanting face opposed to the bevel face, the slanting face of each of the holders being at a smaller angle with respect to the axis of the rotor than the bevel face of each of the magnets before each holder is affixed to the yoke.

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2011-12-19

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