2700-4001_22 IMA Manual
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Last Revision: 12/14/2021
Figure 5.6: Back EMF Voltage vs Electrical Angle
From a manufacturing viewpoint the utilization of a fixed current vector provides the simplest means for aligning a
feedback device. Some manufacturers however will reference a motor’s back emf when discussing commutation
angles. This is due to the ability to quantify via measurement the alignment of a feedback device. With that in mind;
when measuring the back emf phase to phase of the winding the following can be verified on an IMA.
Figure 5.7: Back EMF Voltage Phase to Phase vs Electrical Angle
The quadrature output of the encoder will be such that the rising edge of the A channel leads the rising edge of the
B channel with positive rotation as defined in the graph above.
