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Permanent magnet variable flux sources

Permanent magnet configurations can be designed to give variable uniform magnetic fields, variable field gradients or low frequency alternating fields. Maximum fields available are greater than 1.5 Tesla, with field gradients of greater than 100 T/m. No high current power supply or cooling is needed. The devices, which replace electromagnets in many applications, are controlled manually or by personal computer (PC) controlled stopper servo motors. They are very compact and easy to use.