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In case of brushless motors driven in sinusoidal mode, a field oriented vector control is
performed. The voltage command is the amplitude of the sinusoidal phase voltages. In this case,
the correspondence with the motor phase voltages in SI units i.e. [V] is:
Voltage
where Vdc – is the drive power supply voltage expressed in [V].
In case of brushless motors driven in trapezoidal mode, the voltage command is the voltage to
apply between 2 of the motor phases, according with Hall signals values. In this case, the
correspondence with the voltage applied in SI units i.e. [V] is:
This correspondence is akso available for DC brushed motors which have the voltage command
internal units as the brushless motors driven in trapezoidal mode.
6.7. Voltage measurement units
The internal voltage measurement units refer to the drive V
correspondence with the supply voltage in [V] is:
Voltage
where VdcMaxMeasurable – is the maximum measurable DC voltage expressed in [V]. You can
read this value in the "Drive Info" dialogue, which can be opened from the "Drive Setup".
Remark: the voltage measurement units occur in the scaling of the over voltage and under
voltage protections and the supply voltage measurement
6.8. Time units
The internal time units are expressed in slow loop sampling periods. The correspondence with the
time in [s] is:
where T – is the slow loop sampling period expressed in [s]. You can read this value in the
"Advanced" dialogue, which can be opened from the "Drive Setup". For example, if T =
1ms, one second = 1000 IU.
6.9. Master position units
When the master position is sent via a communication channel or via pulse & direction signals,
the master position units depend on the type of position sensor present on the master axis.
When the master position is an encoder the correspondence with the international standard (SI)
units is:
© Technosoft 2007
=
command
[
] V
Voltage
command
[
] V
VdcMaxMeas
=
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measured
[
] V
Time
[
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×
.
Vdc
1
1
×
Voltage
command
65534
Vdc
=
×
Voltage
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32767
urable
×
Voltage
65520
=
T
×
Time
[
IU
]
64
[
IU
]
[
IU
]
supply voltage. The
MOT
_
measured
[
IU
]
IPS110 Technical Reference
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