PMDC

 

The PMDC machine block implements a permanent magnet excited DC motor.

 

Figure 1  PMDC Motor

 

Dialog Box

Figure 2  PMDC dialog box

 

Electrical Parameter

Parameter Name

Signal

Description

Voltage Constant

Back electromotive force (BEMF) constant. In DC Motor it is same as Torque constant. You can find the value of Voltage Constant or the Torque Constant in the datasheet.

Pole Pair Number

 

The number of pole pairs. It means how many pairs of ‘Field Pole’ in Figure1 there are. In Figure1, the value of Pairs of Poles is ‘1’.

Armature Resistance

The armature resistance between the armature terminal A+ and A-. You can find the value of Armature Resistance in the datasheet. [Ohms]

Armature Inductance

The armature inductance between the armature terminal A+ and A-. You can find the value of Armature Inductance in the datasheet. [H]

Armature Initial Current

Initial value of armature current. Set this value to ‘0’ if you don`t know it.

 

Mechanical Parameter

Parameter Name

Signal

Description

Exclude Rotor /

Include Rotor

 

 

Select the type of Motor between ‘’Exclude Rotor’ and ‘Include Rotor’. The more detail explanation of two types is in the Mechanical Part of the Equation of PMDC.

Rotor Inertia

 

 

Inertia of rotor. This parameter don`t need on the Rotor Speed Type. You can find the inertia of rotor in the datasheet. [kg*m^2]

Friction Gain

 

Viscous friction gain between motor and load. When you apply the friction between the motor and the load in your dynamic model, you have to set this value to ‘0’. [Nms]

Friction Offset

 

Viscous friction Offset between motor and load (B

Rotor Initial Speed

 

 

Initial value of rotor speed. Set this value to ‘0’ if you don`t know it. [rad/s]