ABB XT376a-E HEIE420158R1 Thermal resistance module

Connecting both halves in series results in the drive current flowing through twice as many turns compared with using one half-winding only. For identical currents, this doubles the “amp-turn” and produces a corresponding increase in torque. In practice, the torque increase is seldom 100% due to the non-linearity of the magnetic material. Equally, the same torque will be produced at half the drive current when the windings are in series. Doubling the effective number of turns in the windings means that the inductance increases by a factor of four. This causes the torque to drop off much more rapidly as speed increases. As a result, the series mode is only useful at low speeds. The maximum shaft power obtainable in series is typically half that available in parallel using the same current setting on the drive.

Parallel 

A winding that can be connected in parallel is either an 8-lead motor or 6-lead motor. 8-lead Connecting the two half-windings of an 8-lead motor in parallel allows the current to divide itself between the two coils. It does not change the effective number of turns and therefore the inductance remains the same. At a given drive current, the torque characteristics will be the same for the two half-windings in parallel as it is for one of the windings on its ow 

Conversely, connecting the windings in series will double the total resistance and the current rating is reduced by a factor of 1.4. The provides a safe current of 3.5 amps for a 5.0 amp motor serie

Connecting the windings of an 8-lead

 motor in parallel has the same effect as halving the total resistance. For the same power dissipation in the motor, the current may now be increased by 40%. Therefore, the 5 amp motor will accept 7 amps with the winding in parallel. This provides a significant increase in the available torque. 6-lead “Parallel” in a 6-lead motor refers to the use of one half-winding only. The current rating of a stepper motor is determined by allowable temperature rise. Unless the motor manufacturer’s data states otherwise, the rating is a “unipolar” value and assumes both phases of the motor are energized simultaneously. Therefore, a current of 5 amps means that the motor will accept 5 amps flowing in each half-winding

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