Tolomatic User Guide:
IMA-S Integrated Motor Rod-Style Actuator - Stainless Steel
• 23 •
5:
E L E C T R I C A L I N S T A L L A T I O N G U I D E L I N E S
The halls are configured
such that the falling edge of
the U channel coincides with
the index pulse location.
The graph at right shows
the relationship of the halls
to the phase to phase
back emf. The halls have
an offset of 30 electrical
degrees.
0
W
U
V
60
120
180
240
300
360
V
→
W
W
→
V
U
→
V
0
60
120
180
240
300
360
0
60
120
180
240
300
360
0
60
120
180
240
300
360
Figure 5-4: Hall Alignment
Resolver Feedback
The IMA-S family is also offered with resolver feedback. A resolver must be excited with a sinusoidal
Input and outputs two signals, commonly referred to as cos and sin. These signal’s magnitude and
the phase angle relative to the excitation voltage are used by the drive to determine the absolute
position (single rotational) of the motor’s armature.
These actuators are aligned
with a current vector from
phase V (+) to phase W (-). At
this location, the resolver body
is rotated until the cos signal
is null, and the sin signal is
in phase with the excitation
frequency.
Figure 5-5: Motor rotational position at 0
