· Given a simple motor kit, study the model to understand the

ECET425L Lab 4: Simple Motor Kit Start

Objectives:

underlying motorandgenerator magnetic principles.

Parts List:

· Simple Motor Kit

Introduction

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.

Prelab.

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.

2. Verify that the simple motor rotates, and note how much voltage is needed to turn the motor.

3. 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.

· Given a simple motor kit, study the model to understand the

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