Current Sensor

R2026b

Current sensor in electrical systems

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Current Sensor 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 / Electrical / Electrical Sensors
Simscape / Electrical / Sensors & Transducers

Description

The Current Sensor block represents an ideal current sensor, that is, a device that converts current measured in any electrical branch into a physical signal proportional to the current.

Use the + and - ports to connect the sensor in series with the other blocks in the branch where you want to measure the current. Port I outputs the measurement result as a physical signal. Use a PS-Simulink Converter block to connect this port to Simulink^® blocks, such as Scope or Display.

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.

• Open Model

Shunt Motor

A model of a shunt motor. In a shunt motor, the field and armature windings are connected in parallel. Equivalent circuit parameters are armature resistance Ra = 110 Ohms, field resistance Rf = 2.46KOhms, and back emf coefficient Laf = 5.11. The back-emf is given by Laf*If*Ia*w, where If is the field current, Ia is the armature current, and w is the rotor speed in radians/s. The rotor inertia J is 2.2e-4kgm^2, and rotor damping B is 2.8e-6Nm/(radian/s).

• Open Model

Electrical Transformer

Model a transformer using fundamental magnetic library blocks. The transformer is rated 50W, 60 Hz, 120V/12V and assumed to have an efficiency of 94%, no-load magnetizing current of 1% and a leakage reactance of 2.3%. Core losses are not modeled and the core material B-H characteristic is assumed to be linear.

• Open Model

Ports

Output

I — Current, A

physical signal

Physical signal output port for the electrical current measurement.

Programmatic Use

Port: I

Conserving

+ — Positive terminal

electrical

Electrical conserving port associated with the sensor positive terminal.

Programmatic Use

Port: p

- — Negative terminal

electrical

Electrical conserving port associated with the sensor negative terminal.

Programmatic Use

Port: n

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/Electrical/Electrical Sensors/Current Sensor"

"ee_lib/Sensors & Transducers/Current Sensor"

Example: add_block("fl_lib/Electrical/Electrical Sensors/Current Sensor","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2007a