Torque Capability

The ultimate torque is the static "breakaway torque." To determine this, the magnet carriers are assembled so the inner carrier is locked in position. Then a torque is applied by bar and weights or by a torque wrench to the outer carrier. The torque value at which the two carrier assemblies break loose from each other radially—or "decouple"—is called the "breakaway torque." The designer has to account for the driver start-up acceleration time, start-up torque, and an appropriate safety factor to apply to the breakaway torque to determine the allowable applied torque.

Table 2 gives examples of the torque capability of assemblies composed of NdFeB blocks of magnet 0.75 in wide X 0.38 in high X 1.125 in long (19 mm X 9.65 mm X 28.6 mm) with a 0.180 in (4.6 mm) thick conducting ring.

Basic Dimensioning of Magnet Blocks The magnet blocks can be made too long or too short, resulting in handling, magnet molding, or flux density problems. The ratio of the dimensions for magnet blocks for successful designs is as follows:

TABLE 2 Torque capability of magnet assemblies

Mean Diameter

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