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Intermittent periodic duty with short on-off cycles, expressed in terms of a percentage. The motor is capable of operating at the stated load for the percentage of time stated. The remainder of the time it must be stationary and not powered. The on time must not be long enough to allow the motor to overheat, and not so short as to allow the starting current to significantly affect the temperature rise. In general, for a DC permanent magnet motor with a duty cycle of S3 ×%, the rated torque is equal to the continuous torque multiplied by 1/√( ×/100).