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Warning

The ACIM machine model and its associated Hardware Configurations have been archived.  If starting a new project, consider using the SCIM Machine Model instead.

The AC Induction Machine model implements a three-phase induction machine (asynchronous machine) with a resolver, encoder, and hall effect sensor.

ACIM Configuration Page

In the System Explorer window configuration tree, expand the Power Electronics Add-On custom device and select Circuit Model >> ACIM to display this page.  Use this page to configure the ACIM machine model. Additional information about the model can be found in the National Instruments Help page for the ACIM Constant Parameter Model VI.

This page includes the following components:

AC Induction Machine Model Settings

Name

Specifies the name of the machine model.

Description

Specifies a description for the machine model.

Motor Configuration

Symbol

Units

Default

Description

Magnetizing Inductance

Lm

Henries

0.0462

Specifies the magnetizing inductance of the motor.

Stator Leakage Inductance

Lls

Henries

0.00194

Stator winding leakage inductance.  This value must be greater than 0.

Rotor Leakage Inductance

Llr

Henries

0.00245

Rotor winding leakage inductance.  This value must be greater than 0.

Stator Resistance

Rs

Ohms

0.896

Stator winding resistance. This value must be greater than 0.

Rotor Resistance

Rr

Ohms

1.82

Rotor winding resistance. This value must be greater than 0.

Loop Time

Ts

Seconds

9E-7

Describes the timestep of the machine model.


Pole Pairs

PP


2

Number of machine pole pairs.

Mechanical Model Parameters

Symbol

Units

Default

Description

Inertia


kgm2

0.000225

Moment of inertia of the electric motor.  This value must be equal to or greater than 0.

Friction Coefficient



0

Friction coefficient of the electric motor.  This value must be equal to or greater than 0.

Temperature Correction Parameters

Symbol

Units

Default

Description

Base Temperature

Tbase

Kelvin

298.15

Base temperature for the stator resistance and the rotor resistance. This value must be greater than 0.

Stator Temperature Coefficient

ks

1/Kelvin

0.00393

Coefficient for temperature correction of the stator resistance. This value must be greater than 0.

Rotor Temperature Coefficient

kr

1/Kelvin

0.00393

Coefficient for temperature correction of the rotor resistance. This value must be greater than 0.

Input Mapping Configuration

Use the Input Mapping Configuration to route signals to the Voltage Phase A, Voltage Phase B, and Voltage Phase C inputs of the machine model.  Available routing options may vary depending on the selected Hardware Configuration.

Group

Specifies the group that will be routed to the input voltages of the machine. The available routing options are defined by the selected Hardware Configuration, however it is typical to see the following options by default:

  • Measurements - eHS circuit model measurements

Element

Specifies the index of the measurement in the group that has been selected as the input voltage of the machine.

ACIM Section Channels

This section includes the following custom device channels:

Channel Name

Type

Units

Default Value

Description

Enable

Input


0

Set this channel to one of the following values:

  • 0 - Disables the machine model.

  • 1 - Enables the machine model.

Load Torque

Input

Newton Meters

0Nm

Torque applied to the shaft of the machine.

Rotor Temperature

Input

Kelvin

298.15K

Temperature of the motor rotor. If this value is greater than 0, Temperature Correction is performed for the Stator Resistance and the Rotor Resistance.

Stator Temperature

Input

Kelvin

298.15K

Temperature of the motor stator. If this value is greater than 0,Temperature Correction is performed for the Stator Resistance and the Rotor Resistance.

Va

Output

Volts

0V

Phase A voltage of the electric motor.

Vb

Output

Volts

0V

Phase B voltage of the electric motor.

Vc

Output

Volts

0V

Phase C voltage of the electric motor.

Ia

Output

Amperes

0A

Phase A current of the electric motor.

Ib

Output

Amperes

0A

Phase B current of the electric motor.

Ic

Output

Amperes

0A

Phase C current of the electric motor.

Electromagnetic Torque

Output

Newton Meters

0Nm

Electromagnetic torque of the electric motor.

Speed

Output

RPM

0RPM

Rotor speed of the electric motor.

Position

Output

Radians

0rad

Rotor position of the electric motor.

ACIM Model Description

For a full description of the ACIM model and its parameters, please see the National Instruments Help pages at the links below:

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