EB-109 Motors and Generators
Innovative Technologies in Education (ITE)
EB-109 Motors and Generators
The EB-109 is a single board comprehensive instructional module
designed to teach basic concepts of Motors and Generators to technology
students. The module can be operated as a stand-alone unit or integrated
to the newly developed EB- 2000 Computer Managed Laboratory. The
module contains experimental circuits with which the student performs
a number of conceptual experiments at various levels of difficulty.
Manual or computer driver faultfinding exercises and testing are
available when the module is interconnected to the EB 2000 system,
providing valuable experience in the training and diagnosis of faults.
Test equipment, when used, attaches to the board via 2mm jacks,
placed at various points around the circuits. Students are required
to do only a minimal amount of wiring so training time is maximised.
A comprehensive student manual is provided with each training module.
The manual correlates to the exercises to convey concepts relating
to the technologies covered, allowing focus on specific performance
objectives.
DESCRIPTION
The EB-109 module is designed so that students will spend the maximum
time on the experiments and practice drills for testing comprehension
and troubleshooting. For operation the module is plugged in a PUZ-2000..
The student can thus see the schematic and work with the components.
To facilitate the exercises, all the major signals are brought out
on board with 2mm jacks for tests and interconnections. The IC's
and the transistors are mounted on sockets, enabling an easy replacement.
The student has only to plug-in the appropriate patching cords and
shorting plugs in order to perform the recommended experiments.
The boards comes also equipped with 'black boxes" containing
components used in the fault-finding and practice modes, components
which should not be visually identified by the trainee.
OBJECTIVES
Calculate the speed of a DC motor.
Calculate the speed of an AC generator.
Determine the back-emf and the resistance of a DC motor.
Determine the back-emf constant K of a DC motor.
Use the back-emf constant K to calculate the motor speed.
Understand the effect of increasing the AC generator load on DC
motor speed and current.
Understand the effect of increasing the mechanical load on DC motor
speed and current.
Understand torque and power in a DC motor and AC generator.
Measure the speed regulation of a DC motor as its load changes.
Measure the efficiency of the DC motor AC generator combination.
Measure the input power of the DC motor and the output power of
the AC generator
Understand the speed-frequency characteristics of an AC synchronous
motor.
Understand the torque phenomena in the AC motor.
Use a DC motor as a generator.
Understand the effect of mechanical and electrical loading on the
speed of an AC synchronous motor.
Determine the efficiency and maximum power output for the DC generator.
Understand the effect of closed-loop control of speed with increasing
mechanical load.
Observe the effect of different error amplifications on the closed
loop.
Understand the effect of closed-loop voltage control with various
loads and different amplifier gains.
Understand the effect of overflow in closed-loop control.
Understand how the speed of a DC motor may be controlled by varying
the duty cycle of its power supply, this technique is also called
Pulse Width Modulation (PWM)
Detect faults in a motor -generator system.
RECOMMENDED EXPERIMENTS
1. DC Motor Speed.
2. Back EMF of a DC Motor.
3. Loading a DC Motor with an AC Generator.
4. Speed Regulation, Efficiency, Moment and Power.
5. Variable Frequency and Voltage.
6. Mechanical loading of an AC Motor and a DC Generator.
7. Closed Loop DC Motor Speed Control.
8. Closed Loop Control of AC Generator Voltage.
9. DC Motor Speed Control by a Variable Duty Cycle.
10. Troubleshooting.
REQUIRED ACCESSORIES
DL-20 - Standard set of 2mm patching cords and shorting plugs.
REQUIRED MEASURING EQUIPMENT
20MHZ DUAL TRACE OSCILLOSCOPE
DIGITAL MULTIMETER 3-1/2 DIGITS
2.2MHZ AM/FM FUNCTION GENERATOR
100MHZ COUNTER-TIMER
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