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Mechanical Model Configuration Page

In the System Explorer window configuration tree, expand the Power Electronics Add-On custom device and select Circuit Model >> 6-Ph PMSM BLDC >> Mechanical Model to display this page.  Use  Use this page to configure the PMSM BLDC Mechanical model.

This page includes the following components configurable at edit-time only:

Mechanical Model

Name

Specifies the name of the model.

Description

Specifies a description for the model.

Configuration


Symbol

Units

Default

Description

Viscous Damping

Fv

Newton*meter*second per radian

0.00190986 Nm*s/rad

Combined viscous damping of the rotor and load, proportional to the angular velocity of the machine.

Static Friction

Tf

Newton-meter

0.3665 Nm

Static friction resisting initial rotation when the machine is at rest.

Inertia

J

Kilogram-meter^2

0.0167309 Kg*m^2

Moment of inertia of the rotor and load.

Mechanical Model Section Channels

This section includes the following custom device channels. The value of an input channel can be modified dynamically at execution time.

Channel Name

Symbol

Type

Units

Default Value

Description

Mechanical Model Mode


Input


0

(Speed Controlled)

Set this channel to one of the following values:

  • 0 - Sets the mechanical model to Speed Controlled mode.

  The

  •  The mechanical parameters are ignored in this case.

  • 1 - Sets the mechanical model to Torque Controlled mode.

See the Mechanical Model

Mode

Description section for more information. 

User-Defined Speed

ωuser

Input

RPM

0 RPM

Forces the speed of the machine to the defined value.

  This

 This parameter is used in Speed Controlled mode, and ignored in Torque Controlled mode.

Load Torque

TL

Input

Nm

0 Nm

Torque applied to the shaft of the machine. This parameter is used in Torque Controlled mode, and ignored in Speed Controlled mode.

Mechanical Angle

θm

Output

Degrees

0°

Mechanical rotor position.

Info

If this signal is routed to a Waveform Channel or an Analog Output Channel, its value is expressed in Turns.  The signal ranges in value from 0 to 1, with 1 representing a full rotation.

Speed

ωm

Output

RPM

0 RPM

Rotation speed of the machine rotor in RPM.

Total Torque

Ttotal

Output

Nm

0 Nm

Mathinline
body--uriencoded--T_%7Btotal%7D = (T_%7Be1%7D + T_%7Be2%7D) - T_%7BL%7D - T_%7Bf%7D

Mechanical Model Description

...

Because the 6-Phase PMSM BLDC model implements two electromagnetically independent 3-Phase PMSM BLDC models, we calculate the Speed (ωm) and Total Torque  (Ttotal) by combining the two independent machines electromagnetic torques (Te1 and Te2).   The result is a basic mechanical model which is mechanically coupled but not electrically coupled.

...

Note that in equation 

Mathblock ref
anchormech_speed
, the value of the mechanical speed (ωm) is in radians per second, while the output of the Mechanical Speed channel will be in RPM.  The  The equation for the Electromagnetic Torque (Te) of each type of machine can be found on its specific description page under the Machine Section.

...

When the Mechanical Model Mode is set to Speed Controlled (0), the mechanical parameters (Viscous Damping, Static Friction, Inertia) are ignored.  Instead Instead, the rotor speed is directly set using the User-Defined Speed parameter, ωuser.

...