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PMSM Variable Parameter Model Settings

Name

Specifies the name of the machine model.

Description

Specifies a description for the machine model.

Motor Type

Choose from one of the following types.  The motor configuration parameters automatically populate depending on the

selected Motor Type.

• Constant Parameter

• Variable Parameter

Mechanical Model Parameters

Inertia

kgm²

1

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

Coil Base Temperature

T_c-base

Kelvin

200

Base temperature of the motor coil. This value must be equal to or greater than 0.

Coil Temperature Coefficient

k_c

1/Kelvin

0

Coefficient for temperature correction of the motor resistance. The material of the coil determines this value.

Magnet Base Temperature

T_m-base

Kelvin

200

Base temperature of the motor magnet. This value must be equal to or greater than 0.

Magnet Temperature Coefficient

k_m

1/Kelvin

0

Coefficient for temperature correction of the magnet flux. The material of the magnet determines this value.

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.

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 externally applied to the shaft of the machine. This parameter is used only if Force Speed is disabled (0).

Force Speed

Input

0

Set this channel to one of the following values:

• 0 - Disables Forced Speed mode. The Force Speed Setpoint parameter is ignored in this case.

• 1 - Enables Forced Speed mode.  The Mechanical Model Parameters and Load Torque are ignored in this case.

Force Speed Setpoint

Input

Radians per second

0rad/s

Forces the speed of the machine to the defined value.  This parameter is used only if Force Speed is enabled (1).

Coil Temperature

Input

Kelvin

0K

Temperature of the motor coil. If this

value is greater than 0, Temperature Correction

 is performed for the resistance and magnet flux.

Magnet Temperature

Input

Kelvin

0K

Temperature of the motor magnet. If this

value is greater than 0, Temperature Correction

 is performed for the resistance and magnet flux.

BackEMF Gain

Input

0

Current Phase A

Output

Amperes

0A

Phase A current of the electric motor.

Current Phase B

Output

Amperes

0A

Phase B current of the electric motor.

Current Phase C

Output

Amperes

0A

Phase C current of the electric motor.

Direct Stator Current

Output

Amperes

0A

Direct current of the electric motor.  The value of dq current corresponds to the value of ABC current in the flux, torque (d, q) rotating reference frame.

Quadratic Stator Current

Output

Amperes

0A

Quadratic current of the electric motor.  The value of dq current corresponds to the value of ABC current in the flux, torque (d, q) rotating reference frame.

Electromagnetic Torque

Output

Newton Meters

0Nm

Electromagnetic torque that the electric motor generates while it is running.

Speed

Output

Radians per second

0rad/s

Rotor speed of the electric motor.

Position

Output

Radians

0rad

Rotor position of the electric motor.

BackEMFa

Output

Volts

0V

BackEMFb

Output

Volts

0V

BackEMFc

Output

Volts

0V

Direct Inductance

L_d

Henries

0.024H

Inductance along the d or direct axis.

Quadrature Inductance

L_q

Henries

0.028H

Inductance along the q or quadrature axis.

Loop Time

T_s

Seconds

1E-6s

Describes the timestep of the machine model.

Pole Pairs

PP

3

Number of machine pole pairs.

Flux Linkage

λ

Webers

0.1Wb

Flux linkage between the rotor and stator.  This value must be greater than 0.

Resistance

R

Ohms

1.2

Resistance in the electric motor. This value must be greater than 0.

Model File

Path to the model file on disk. The model file contains tables describing the d inductance, q inductance, and flux as a function of Direct Current and Quadratic Current. Additional formatting information and templates can be found here:

• Template CSV file for PMSM VDQ Model

• Inductance and Flux Table Description

• JSON File Structure

Table Size

100

Specifies the size of the L_d, L_q, and Flux tables in the Model File.

Loop Time

T_s

Seconds

1E-6s

Timestep of the machine model.

Delimiter

,

Specifies the type of text delimiter in the Model File.

Resistance

R

Ohms

1.2

Resistance in the electric motor. This value must be greater than 0.