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In one assembly of gyros stray field from the hysteresis-motor stators had to be controlled. In addition, the motors had to achieve adequate starting and synchronizing torques. Power input, voltage and exciting current were also specified. Wide variations in system performance stemmed from variations in the rotor's hysteresis rings. These ring laminations were punched from P6 alloy, a modified 50/50 cobalt-iron alloy. Analysis of experimental results indicated the lack of control of alloy heat treatment as the source of trouble. Modified minor-loop properties were specified as well as a recommended heat treatment. These specifications now guarantee maximum starting and synchronizing torques associated with a minimum stray field.
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L. I. Mendelsohn (1973) studied this question.
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