Originally Posted by dnelson Pacific Scientific PowerMaxII M21NXXA* Nema 23 8-lead stepper motors can be connected as:
Unipolar (100 oz-in at rated 4.0A/phase, 0.46ohm ph resistance)
Bipolar series (142 oz-in at rated 2.8A/phase, 0.92ohm ph resistance)
or Bipolar parallel (142 oz-in at rated 5.6A/phase, 0.23 ph resistance)
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This motor have 8 coils. One coil inductance is L.
1) Serial Bipolar operations.
One phase inductance Ls=2L and phase current = I = 2.8A
We can find the storaged energy in the inductance.
W = 0.5 * L * i^2 = 0.5 * 2*L * 2.8 * 2.8 = 7.84 * L
2) Parallel Bipolar operations.
One phase inductance Lp=L/2 and phase current = 2*I = 5.6A
We can find the storaged energy in the inductance.
W = 0.5 * L * 0.5 * i^2 = 0.5 * 0.5 * L * 5.6 * 5.6 = 7.84 * L
You can see we find same results.