Challenge

Project 1

PWM controlled fan load with DC motor

Objective;

To Model a fan type load in simulink and to control its speed by using the PWM Method

This works to model a DC motor driven by an input signal that approximates a pulse-width modulated signal
these signals are fed to the motor using an H bridge circuit
We assume that the change of operating speed of the fan is through stepwise modulation through a fan regulator
PWM, H bridge, DC Motor

BLOCKS ARE USED IN MODEL:

SIMULATION MODEL;

SCOPE (OUTPUT);

The speed of the fan is varied according to the input voltage using PWM technique.
By changing or modulating the timing of these pulses the speed of the motor can be controlled.
When the motor is on, the H-Bridge block connects the motor terminals to the power supply.
When the motor is off, the H-Bridge block acts as a freewheeling diode to maintain the motor current.

Pulse width Modulation;

Pulse width Modulation (PWM) is a method of reducing the average power delivered by an electrical signal,by effeciency it into discrete parts
The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate.

Model Description;

The DC motor block uses manufactuer datasheet parameter,which specify the motor as delivering 10w mechanical power at 2500rpm and no load speed as 4000rpm when run from a 12v dc supply
H bridge block represents a motor drive.

COMPONENT USED IN MODEL;

PULSE GENERATOR;

Pulse type determine the Computational technique used
TIme-based is recommended for use with a variable step solver,while sample -based is recommended for for use with a fixed step solver or within a dicrete portion of a model using a variable step solver

IDEAL ROTATIONAL MOTION SENSOR;

This block measure angular velocity or angle in mechanical rotational network
the sensor is ideal since it does not for inertia,friction,delays,energy consumption.

DC MOTOR;

The block assumes that no electromagnetic energy is lost ,and hence the back-emf and torque constants have the same numerical value when in SI units
parameter can be set to some small non-zero value

Ship work like this
in your own course.