Motors and generators are both considered machines, and both can operate
with either ac or dc. This laboratory briefly explores a dc motor. Permanent magnet dc
motors(PMDC) aredc motors that have polesconsistingof magnets.One primary
advantage of these machines is that they do not require a dc field winding, and
they have no associated field winding copper losses,as dotheir dc shunt or induction
motor counterparts.Permanent magnet motors aretypicallythe most efficient motors
available.It is only because of the high costs of permanent magnets that more of
these motors are not used.The prevailing work horse for generating power to the ac grid
is still the ac synchronous generator.A synchronous generator, like its dc counterpart the
shunt motor, must haveits magnetic field supplied by a separate dcpower source.
Build the simple motor kit per the instructions givenin theprovidedlink.
ProcedureA. Simple, PermanentMagnet DCMotor
1.Document any troubleshooting issues you may have encountered in getting the motor to function.
- Verify that the simple motor rotates, and note how much voltage is needed to turn the motor.
- Include in your report an oscilloscope screenshot showing the collectortoemitter voltage of the BJT.
Make sure to list all supporting details.
What is the applied voltage?
What is the resulting frequency of the waveform?
What is the corresponding rotor shaft speed?
4.Explainin detailhow the simple motor worksand be sure to include the functions of the reed relay and transistor.
5.Include a photograph in your report of your completed motor.
Questionsand Discussion
1.Explain the major differences between a motor and a generator.
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