Voltage drive

An ideal voltage source driven by a control signal.

  • signal
  • electrical
  • Gradara equations
  • 3 ports
BlockVoltage driveKindvoltageLibraryElectrical

Description

An ideal voltage source whose voltage equals its input signal. It behaves the same as Controlled voltage, with the input on the left.

Example

Motor speed control

Speed referencePI controllerVoltage driveDC motorInertia & loadSpeed sensorGround
In Gradara, select a Voltage drive block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:StepPI controllerDC motorInertia & loadSpeed sensorGround

Ports

Inputs 1

  • inusignal · V

    Commanded voltage p.v − n.v, in volts.

Conserving terminals 2

  • +pelectrical

    Positive terminal.

  • −nelectrical

    Negative terminal.

Equations

Modelica
p.v − n.v = u
p.i + n.i = 0

Implementation

The block’s Modelica model
v = u;

Assumptions and limitations

  • No internal resistance or current limit. The voltage follows the input instantly.

Tips

  • Typical use: a controller output driving DC motor.

Used in

These larger examples use it too. Open them from Examples in the app.

  • Motor speed control
  • 480 VAC → 24 VDC flyback
  • Servo position control

See also

Select a block in Gradara and press F1 to open its page offline.