At each rotary stage of the stepping motor, a smooth starting operation can be ensured without any adverse inertial effect at the start or end of rotation, the stepping motor being temporarily driven at {HEAD ~ low speed} at {TAIL ~ the end} of each pulse 
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At each rotary stage of the stepping motor , a smooth starting operation can be ensured without any adverse inertial effect at the start or end of rotation , the stepping motor being temporarily driven at { HEAD ~ low speed } at { TAIL ~ the end } of each pulse
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