Application Catalog
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| 16 - Analysis of a Hybrid Stepper Motor<TR> |
Overview
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One type of hybrid stepper motor has a cylindrical magnet, magnetized in
the axial direction, that is sandwiched in the rotor, which has serrated
teeth to create salient poles.
Analyzing a hybrid stepper motor requires a large model due to its complex
shape and 3D flux distribution.
The important properties for positioning control are the detent torque,
the alignment torque when the stator coil is not excited, the stiffness
torque and the static torque.
This example presents how to use a magnetic field analysis to obtain the
detent torque and stiffness torque of a hybrid stepper motor. |
Detent Torque
The detent torque is shown in Fig.1, and the flux distribution in the cross-section
at the rotation position of 0.45 (deg) is shown in Fig.2. A closer view
to show the flux distribution in the gap is shown in Fig.3.
These results reveal that the flux in both rotor and stator are saturated
even with no excitation. The flux leakage around the tips of the teeth,
due to saturation, can be expected to have a large effect on the detent
torque. |
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Stiffness Torque
Fig.4 shows the stiffness torque with one-phase excited, and Fig.5 shows
the stiffness torque with two-phase excited. The flux distribution in the
gap of the cross-section with one-phase excited is shown in Fig.6, and
the flux distribution in the gap of the cut plane with two-phase excited
is shown in Fig.7.
As for the detent torque, the flux around the teeth is saturated. The flux
leakage caused by the saturation can be expected to also have a large effect
on the stiffness torque. |
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(reference:
Y.Kawase,T.Ymaguchi,T.Matsuda,H.Domeki,and M.Kobori:
"Torque Characteristics Analysis of Hybrid Stepping Motor Using 3-D
Finite Element Method",
IEEJ Trans. IA, Vol.123(2003), No.4) |
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Updated: 2011-02-28
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