Modelica.Electrical.Machines.Sensors

Sensors for machine modelling

Information

This package contains sensors that are useful when modelling machines.

Extends from Modelica.Icons.SensorsPackage (Icon for packages containing sensors).

Package Content

Name	Description
VoltageQuasiRMSSensor	Length of space phasor -> RMS voltage
CurrentQuasiRMSSensor	Length of space phasor -> RMS current
ElectricalPowerSensor	Instantaneous power from space phasors
MechanicalPowerSensor	Mechanical power = torque x speed
RotorDisplacementAngle	Rotor lagging angle
HallSensor	Hall sensor
SinCosResolver	Sin-Cos-Resolver

Modelica.Electrical.Machines.Sensors.VoltageQuasiRMSSensor

Length of space phasor -> RMS voltage

Information

Measured three-phase instantaneous voltages are transformed to the corresponding space phasor; output is length of the space phasor divided by sqrt(2), thus giving in sinusoidal stationary state RMS voltage.

Extends from Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Connectors

Name	Description
V	[V]
plug_p
plug_n

Modelica.Electrical.Machines.Sensors.CurrentQuasiRMSSensor

Length of space phasor -> RMS current

Information

Measured three-phase instantaneous currents are transformed to the corresponding space phasor; output is length of the space phasor divided by sqrt(2), thus giving in sinusoidal stationary state RMS current.

Extends from Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Connectors

Name	Description
I	[A]
plug_p
plug_n

Modelica.Electrical.Machines.Sensors.ElectricalPowerSensor

Instantaneous power from space phasors

Information

Three-phase instantaneous voltages (plug_p - plug_nv) and currents (plug_p - plug_ni) are transformed to the corresponding space phasors,
which are used to calculate power quantities:

P = instantaneous power, thus giving in stationary state active power.
Q = giving in stationary state reactive power.

Extends from Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Connectors

Name	Description
P	[W]
Q	[var]
plug_p
plug_ni
plug_nv

Modelica.Electrical.Machines.Sensors.MechanicalPowerSensor

Mechanical power = torque x speed

Information

Calculates (mechanical) power from torque times angular speed.

Extends from Modelica.Icons.RoundSensor (Icon representing a round measurement device), Modelica.Mechanics.Rotational.Interfaces.PartialTwoFlanges (Partial model for a component with two rotational 1-dim. shaft flanges).

Parameters

Name	Description
useSupport	Use support or fixed housing

Connectors

Name	Description
flange_a	Flange of left shaft
flange_b	Flange of right shaft
P	[W]
support	Support at which the reaction torque is acting

Modelica.Electrical.Machines.Sensors.RotorDisplacementAngle

Rotor lagging angle

Information

Calculates rotor lagging angle by measuring the stator phase voltages, transforming them to the corresponding space phasor in stator-fixed coordinate system,
rotating the space phasor to the rotor-fixed coordinate system and calculating the angle of this space phasor.

The sensor's housing can be implicitly fixed (useSupport=false).
If the machine's stator also implicitly fixed (useSupport=false), the angle at the flange is equal to the angle of the machine's rotor against the stator.
Otherwise, the sensor's support has to be connected to the machine's support.

Parameters

Name	Description
m	Number of phases
p	Number of pole pairs
positiveRange	Use only positive output range, if true
threshold	Below threshold the voltage is considered as zero
useSupport	Use support or fixed housing

Connectors

Name	Description
rotorDisplacementAngle	[rad]
plug_p
plug_n
flange
support	Support at which the reaction torque is acting

Modelica.Electrical.Machines.Sensors.HallSensor

Hall sensor

Information

Simple model of a hall sensor, i.e. measuring the angle of the flange (w.r.t. the optional support), multiplying by the number of phases p to obtain the electrical angle, and adding a correction term i.e. the initial angle of the flange phi0.

Note that phi0 has to be set that way, that in shaft position phi0 the flux linkage of phase 1 is a maximum.

Extends from Modelica.Mechanics.Rotational.Interfaces.PartialElementaryOneFlangeAndSupport2 (Partial model for a component with one rotational 1-dim. shaft flange and a support used for textual modeling, i.e., for elementary models).

Parameters

Name	Description
useSupport	= true, if support flange enabled, otherwise implicitly grounded
p	Number of pole pairs
phi0	Initial mechanical angle [rad]

Connectors

Name	Description
flange	Flange of shaft
support	Support/housing of component
y	"Electrical angle" [rad]

Modelica.Electrical.Machines.Sensors.SinCosResolver

Sin-Cos-Resolver

Information

Simple model of a sin-cos-resolver, i.e. sensing the angle of the flange phi (w.r.t. the optional support) and multiplied by p, providing 4 signals:

y[1] = offset + amplitude*cos(p*(phi - phi0))
y[2] = offset - amplitude*cos(p*(phi - phi0))
y[3] = offset + amplitude*sin(p*(phi - phi0))
y[4] = offset - amplitude*sin(p*(phi - phi0))

Thus the sine and cosine signals have p periods per mechanical revolution. Adding an offset > amplitude, the loss of one track can be determined. Subtracting the negated signal from the signal, the offset is removed and a cosine and a sine with doubled amplitude are accessible. From this signal, the angle within one pole pair of a machine can be determined for field oriented control. Block SinCosEvaluation can be used.

This model can be used to export FMUs of drives to develop control strategies in other environments. When switching to a real drive, the same inputs as from the FMU can be used.

Note that phi0 has to be set that way, that in shaft position phi0 the flux linkage of phase 1 is a maximum. In order to sense the mechanical angle of the shaft p = 1 has to be set.

Parameters

Name	Description
useSupport	= true, if support flange enabled, otherwise implicitly grounded
p	Number of pole pairs
amplitude	Amplitude of signals
offset	Offset of signals
phi0	Initial mechanical angle [rad]

Connectors

Name	Description
flange	Flange of shaft
support	Support/housing of component
y[4]	Track signals

Automatically generated Thu Oct 1 16:07:41 2020.