User manual

PoStep60 user manual
10
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The advantage of using series winding is that lower power drives may be used. For example a
unipolar motor rated for 4.0A/phase running in series requires only 2.0A/phase to achieve the same
torque. The disadvantage of this method is that it raises motor inductance, which in turn, slows
motor coil charging time. Since proper torque is reached only when the coil has charged to the
required level, the longer it takes to charge, the longer until full torque is achieved. This leads to
slower full torque stepping rates. Conversely, a half-winding configuration requires full nameplate
rated current, but if the drive is capable of this, the advantage is that rated torque can be achieved
twice as fast as series winding (using the same voltage, when comparing half-winding and series).
4.4.2.3 8-wire motors
can be run in paralell (type E) or serial (type D) mode. Parallel mode needs higher current, has lower
inductance and better torque, Serial mode needs lower current and has lower torque. Please read
also 6-wire motors.