PS Subtract
R2026bCompute simple subtraction of two input physical signals
PS Subtract block
To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.
Libraries:
Simscape /
Foundation Library /
Physical Signals /
Functions
Description
The PS Subtract block subtracts one physical signal input from another and outputs the difference:
where
| I1 | Physical signal at the first input port (marked with the plus sign) |
| I2 | Physical signal at the second input port (marked with the minus sign) |
| O | Physical signal at the output port |
Physical signals at the two input ports must have commensurate units. The unit at the output port is determined by unit propagation rules. For more information, see Physical Signal Unit Propagation.
Examples
Nonlinear Inductor
An implementation of a nonlinear inductor where inductance depends on current. A tanh function defines the nonlinear flux-current relationship. The flux saturates for large currents, which can occur, for example, in iron core inductors.
Solenoid
A solenoid with a spring return. The solenoid is modeled as an inductance whose value L depends on the plunger position x. The back emf for a time-varying inductance is given by:
Ports
Input
Output
Programmatic Use: Add Block
To add the block programmatically, use the add_block function with one of these library block paths as the source.
"fl_lib/Physical Signals/Functions/PS Subtract"
Example: add_block("fl_lib/Physical Signals/Functions/PS Subtract","myModel/myBlock",MakeNameUnique="on")
For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.
