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Installation and Configuration
Ndrive HL User’s Manual
2-12
www.aerotech.com
2.4.3.3. Hall-Effect
Phasing
For an AC brushless motor with an unknown phase/hall sequence, one of two simple
tests can be performed on the motor to determine the proper connections to the Ndrive
HL.
Be sure to first configure the axis parameters before
running the A3200\Programs\Samples\MsetDebug.Pgm.
See the “Getting Started” section in the Nview help for
configuration information.
The first of which, is by actively driving the motor under program control. The
A3200\Programs\Samples\MsetDebug.Pgm may be used for this purpose, as well as for
motor lead phasing. The hall signal wiring must be swapped until they generate the
sequence as defined in the Nview help, which the test program will display. After the hall
sequence is correct, the program can then correctly determine if a commutation offset is
required. The test program will indicate the required value of the CfgMotOffsetAng axis
parameter to correctly phase the motor.
The second method is a non-powered method, whereby the motor is disconnected from
the controller and connected in the test configuration as defined in Figure 2-10. This will
identify the hall signals (and motor leads) A, B and C. The equipment needed for the
non-powered test is a two-channel oscilloscope and three resistors (typically 10 K ohm,
1/2 watt) wired in a Wye configuration.
Before performing the test in Figure 2-10, ensure that the
motor leads are completely disconnected from the
amplifier.
The tests outlined below do not require that the amplifier
be powered since Figure 2-10 illustrates the generated
output voltage of the amplifier relative to the input Hall
sequences.
Connect the ends of the three resistors to motor terminals A, B, C. Use one channel of
the oscilloscope to monitor motor terminal A with respect to the Wye neutral (i.e., the
point where all three resistors are connected together). Turn the shaft of the motor CW
and note the generated voltage. This voltage represents the phase A to neutral Counter
EMF (CEMF). With the second oscilloscope probe, determine the Hall switch that is in
phase with this voltage. Similarly, phase B and C should be aligned with the other two
Hall switches. This will identify each motor and hall lead set, which are in-phase with
each other. Any motor and hall lead set may be phase A. The relative phasing between
this set and the other two sets will then determine which is phase B and phase C.
Refer to Figure 2-10 and note the generated output voltages of the amplifier relative to
the Hall sequences applied to
HALL A, HALL B, and HALL C
connections at
connector J207. For proper operation, the CEMF generated motor phase voltages should
be aligned to the amplifier’s generated output voltage with the Hall effect reference
sequence shown in Figure 2-10.
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