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Condensed Table of Contents - Second Year
Motor Terminology - AC Wattmeter
Split-Phase Motor
Split-Phase Induction Motor Characteristics
Split-Phase Motor Starting Characteristics
Split-Phase, Capacitor-Start Motor
Starting the Split-Phase, Capacitor-Start Motor
Capacitor-Start Motor Performance
Series DC Motor - DC Shunt Motor. Part I
DC Shunt Motor, Part II - DC Shunt Stall Torque
Back EMF for a DC Motor
No load Resistance Test of a DC Shunt Motor
Opposition Test Method
Dynamic Breaking of a DC Shunt Motor
The Repulsion-Start, Induction-Run Motor
Repulsion-Start, Induction-Run Motor
The Squirrel Cage Induction Motor
Y-Delta Operation of a Squirrel Cage Motor
Unbalanced Operation of an Induction Motor
Voltage Effects on a Three Phase Motor
Dynamic Braking of An Induction Motor
Regenerative Braking of An Induction Motor
Polyphase Motor Power Factor
Universal Motor - Universal Motor Performance
Capacitor-Run Motor - Cap-Run Performance
The DC Shunt Generator - Series DC Generator
Saturation - DC Motor - Compound Generator
Parallel Operation of a Shunt Generator
Parallel Operation of a Series Generator
Parallel Operation of a Compound Generator
Synchronous Motor - Synchronous Phase Slip
Field Excitation on Synchronous Motors
Power Factor and the Synchronous Motors
Wound-Round Induction Motor - Controller
No Load Locked Rotor Test Wound Rotor Motor
Alternator - Alternator Variable Speed Drive
Alternator Regulation - Alternator Loading
Alternator Synchro. - Synchronous Impedance
Motor Generator Speed - Phase Converter
Self-Synchronizing - Frequency Conversion
Electronic Power Control - Shunt Motor Starter
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P135 Split Phase, Motor
Designed to teach the principles of
resistance split phase inductive start motors. The main winding, staring winding
and speed-sensitive switch are all brought out to color coded binding posts.
Horsepower 1/4 and 115 volts, 60hz. Full load amps 4, and full load speed 1725.
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P136 Capacitor Start Motor
Designed to teach the principles of capacitor
start motors. The main winding, starting winding and speed-sensitive switch are
all brought out to color coded binding posts, as is the capacitor. Horsepower 1/4
and 115 volts, 60 hz. Full load amps 4, and full load speed 1725.
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P131 DC Machine
May be used to teach principles of DC
motors and generators. The machine is compound wound enabling shunt, series and
compound modes of operation. Armature, shunt field and series field terminal are
brought out to color coded binding posts for ease of connection. A shunt field
rheostat is also provided with its terminals brought out to binding posts. Rated
as: Horsepower 1/3 nominal input voltage 125 DC, nominal full load amps 2.6,
nominal speed (RPM) 1750. Generator: maximum rated output 100 watts DC, nominal
output voltage 125 VDC, full load amps, 0.8A, nominal speed 1750.
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P602 Eddy Current Prony Brake
It is essential to mechanically load a motor to determine experimentally its
load characteristics. P602 Magnetic Prony Brake is designed to couple readily
with any LEK-PAK motor. Unlike in mechanical prony brakes, there is no direct mechanical
coupling between the pointer and the shaft under load. A given torque can be
maintained continuously. The unit provides up to 30 Ibs. in torque in each
direction and is adjusted with the control knob.
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Single Phase/DC Motors (Group
B)
P331 AC/DC Power Supply
P135 Split Phase Motor
P136 Capacitor Start Motor
P131 DC Motor/Generator
Hand Tachometer
P602 Magnetic Prony Brake
Group B Complete:
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P133 Three Phase Squirrel Cage
Motor
May be used to teach the principles of
polyphase squirrel-cage motors and as a prime mover for driving generators,
alternators, etc. It can operate Delta or WYE. The three stator coils are
brought out to color coded binding posts. Horsepower 1/4, 3 phase, 208 volts, 60
hz. Full load amps 1.4 and full load speed, 1725.
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P134 Wound Rotor/Synchronous
Motor
May be used to teach the principles of
polyphase wound rotor induction motors and as a prime mover for driving
generators, alternators, etc. Also it can be operated as induction generator, or
power selsyn. Synchronous Machine may be used to teach principles of polyphase
synchronous motors and alternators. The machine is DC excited on the rotor and
has self-starting characteristics in the synchronous motor mode of operation.
The three stator coils and the rotor terminals are brought out to color coded binding
posts. Rated as: Horsepower 1/3, input voltage 3, phase, 208v, frequency 60 Hz,
1.7 full load amps, 1710 rpm. Rotor Excitation - 24 VDC for synchronous
operation.
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Three Phase Motors (Group C)
P210 Three Phase AC/DC Power Supply
P133 Three Phase Induction Motor
P134 Wound Rotor/Synch. Motor
Hand Tachometer
P602 Magnetic Prony Brake
Group C Complete:
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P137 Capacitor Run Motor
Used to teach the principles of permanent
capacitor split-phase motors. The main winding, auxiliary winding and capacitor
terminals are all brought out to color-coded binding posts. Horsepower is 1/4
and nominal input voltage is 115, 60 hz. Full load amps is 3 and full load speed
is 1700.
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P138 Universal Motor
Designed to teach the principles of
universal motors and it serves as a variable speed prime mover operable both on
AC and DC voltages. It is equipped with two binding posts for the armature and
four for the fields. The full field is used for AC operation and a portion of it
is used for DC operation. Horsepower is 1/4 and the input voltage (AC or DC) is
100 volts (60 hz).
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Specialized Motors (Group D)
P137 Capacitor Run Motor
P138 Universal Motor
Group D Complete:
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P205 Three Phase Wattmeter
Incorporates two 5" single phase wattmeters
to measure up to 300 watts at 2 amps per wattmeter. The two wattmeter method is
used to calculate three phase power at all normal power factors. To use the
meter panel, it is merely necessary to connect a three wire, three phase input
and to take the the output from the appropriate binding posts. Phasing Switches
are provided to correct for line imbalances. Can be used with any three phase
source up to 240VAC. Wattmeter current coils are magnetic circuit breaker and diode
protected.
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P210 Three Phase & DC Power
Supply
Provides five sep rate power sources:
a) 120/208V 15A protected 3 phase, 4 wire
b) 0-120/208V, 5A variable protected, 3 phase, 4 wire
c) 120VDC, 2 Amp DC, protected
d) 0-120VDC, 8 Amp, Variable DC, protected
e) 24VDC, 2 Amp, Filtered, protected
All AC and High voltage DC outputs
can be read on the switched voltmeter. Dual Electro-Lock key switch protected.
Required input is 208/120vac, 3 phase 4 wire, 60 hz. Special 50 hz version
available with power transformer to convert higher voltages of 50hz three phase
to 208/120vac.
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Additional Lek Pak Vol. 1 Manual
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Additional Lek Pak Vol. 2 Manual
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