MOSFET

In this lab we use a MOSFET to control the voltage across a motor.

We first connect the motor to the MOSFET and a potentiometer.

We observe that the motor does not begin to rotate until around 3.9 V

As we adjust the pot we notice that the motor reacts to the change in voltage that is occurring. It is fairly difficult to make the motor shaft rotate at approximately once per second.

PWM Chopper MOSFET 

We replace the pot with a square wave generator set at 10 Khz. We use the oscilloscope to display the waveform of the motor voltage.