2013年8月14日星期三

permanent magnet sucker working point selection

Because a wide range of lifting the workpiece, therefore, magnetic chuck working electrode surface and the surface of the air gap distance is changing, the magnetic circuit is a dynamic magnetic circuit. NdFeB magnet recovery curve and operating point of the permanent magnet schematic work status change is in the recovery curve (AD) on the changes. When the permanent magnet sucker in the open state, the permanent magnet magnetic name tags demagnetization operating point to point A on the curve represents; when polar permanent magnet sucker work completely seamless engagement with the workpiece, its operating point is point D, this time, the permanent magnet All the magnetic flux through the workpiece. Chuck near the workpiece surface the permanent process, the operating state of the permanent magnet along the arrow from A to D; turn, magnetic chuck away from the workpiece, the working status of the permanent magnet along the arrow from D to A. Since these two curves is very close, can be approximated by a straight line AD to replace. OA is the work suspension magnets of the permanent magnet load line. Useful response to (Erec) is a permanent magnet useful in the operating point of the magnetic flux density B and the field strength H of the product withdrawal (Erec = B * H).
Hatched area EFGC area. E point and the operating point of the permanent magnet, should be designed to point E near the midpoint of AD response curve, so that A is a useful starting point back to the maximum.

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