# Modul Praktikum Mesin Listrik

Modul
Praktikum Mesin Listrik
Oleh:
Hery Teguh Setiawan
Jurusan Teknik Elektro
Fkultas Teknik
Universitas Tidar
2020
Daftar percobaan.
1. DC Generator of a Permanent Magnet
2. Field-winding DC Shunt Generator
3. Rotary Field Three-phase Generator
4. Rotatory Armature Type Three-phase AC Generator
5. Series Motor using Field Coil
6. DC Compound Motor
7. Spilt-Phase Motor
DC Generator of a Permanent Magnet
1. Purpose
Observe how an AC electromotive force generated by armature gets rectified by a
commutator and find out the relationship between induced electromotive force and polarity
through hands-on exercises.
2. Components
② DC Amperemeter/Voltmeter Module (CPE-ER1500-15) : 1set
③ Yoke Frame Module(CPE-ER1500-17) : 1set
④Drive Motor Module(CPE-ER1500-18) : 1set
⑤ 2-pole rotator (AM2) : 1set
⑥ circle permanent magnet (AM8) : 2set
⑦ Large Permanent Magnetic Force (AM9) : 2set
⑧ Brush & Holder H(AMH) : 1set
⑪ Rotator Rack (AMJ) : 1set
⑫ magnetic pole rack(AMK) : 2set
⑬ fixing bolt(AML) : 3set
⑭ operation belt(AMN) : 1set
⑮ 8mm spanner(AMM) : 1set
⑯ Oscilloscope(Option) : 1set
3. Precautions
① DC Voltmeter and Amperemeter Module(CPE-ER1500-15)’s measuring socket should
be selected depending on the power and polarity of the induced electromotive force.
② Make sure not to touch or let connection cord get stuck in the operation belt while the
drive motor is working.
③ Ensure brush holder set is solidly set in its position to avoid any friction noise between
commutators.
4. Components of practice circuit
① Module Composition and circuit diagram
Figure 4-6 Permanent magnet AC Generator Connection Diagram
② Circuit Diagram
Figure 4-7 AC Voltage Generating circuit by permanent magnet
5. Procedures
① Understand the given problems and objectives to select appropriate components.
② Set up Drive Motor, Yoke Frame, AC Voltmeter/Amperemeter, DC/AC Load
Module(CPE-ER1500-10) in a practice board rack as shown in the Figure 4-6.
③ Set up a rotator rack (AMJ) in the middle hall of yoke frame and fix magnetic pole rack
(AMK) in between P1 and P5 using a spanner.
④ Firstly, Set up 2 pole rotator (AM2) in rotator rack (AMJ) and put in a permanent
magnet in magnetic pole rack (AM9). On top of it, fix large permanent magnetic
pole by tightening a fixing bolt. N pole and S pole of permanent circle magnet should
be placed in P1 and P5 respectively
⑤ Put in brush & holder H (AMH) into the slip ring of 2 pole armature
and check the
connection status between AC slip ring and brush and fix it.
⑥ Connect Load(bulb) and AC voltmeter/amperemeter from the connected output socket
of brush referring to the figure 4-6 and 4-7.
⑦ While not connecting the operation belt (AMN), try to rotate the 2-poles armature with
hand (Place fingers at the side of bobbin and turn). Check if AC galvanometer and
gradation of amperemeter moves and light bulb lights up.
(Use DC voltmeter : 5V, AC Voltmeter : 100mA,
Blub: 3V)
Induced Current = Approx. [A]
Induced Voltage = Approx. [V] ?
Also, Connect Oscilloscope to the A2 B2 sockets of yoke frame and observe the
output ripples produced. (Oscilloscope should be set at DC 1[Vp-p]/50[ms] Range.
⑧ Exchange the polarity of DC voltmeter and amperemeter’s input sockets (COM ↔ 5V,
COM ↔ 100mA) and quickly rotate the two-pole armature in a clockwise direction.
Check if gradation of DC voltmeter and amperemeter moves and bulb lights
up.Observe the ripples produced and compare the changes with that of⑦.
⑨ Set DC Voltmeter and Amperemeter to its default and connect drive motor and 2-pole
armature to pulley by using an drive belt.
⑩ Exchange bulb into 6[V] before running the drive motor and convert measuring sockets
of DC voltmeter/amperemeter into 10V/1A. Oscilloscope should be set at DC 5[Vpp]/10[ms].
⑪ Put the rotation direction of a drive motor at CCW and turn ON the module while
keeping the speed controller at its minimum speed. Slowly turn it in a clockwise
direction to increase the rotation speed and observe the ripples and output values
generated. Record it in 4-3.
Table 4-3 When the direction of 2-pole electromagnet is Anticlockwise
Direction
Drive Motor’s Rotation per
No.
minute[rpm]
induced
electromotive force
ℯ
ripple
(Rotation speed of 2-pole
armature)
Voltage
Output
Current
1
600
[V]
[A]
2
1000
[V]
[A]
3
1300
[V]
[A]
4
1600
[V]
[A]
⑫ When the practice above is done, minimize the speed of drive motor and turn it OFF.
Exchange socket polarities of DC voltmeter and amperemeter and keep the rotation
direction of drive motor at CW and repeat⑪. Record the observation in the table 4-4.
Table 4-4 When the direction of two-pole armature is Clockwise
Direction
induced
Drive Motor’s Rotation per
electromotive force
minute[rpm]
Output
ℯ
Ripple
(Rotation speed of 2-pole
armature)
Voltage
Current
1
600
[V]
[A]
2
1000
[V]
[A]
3
1300
[V]
[A]
4
1600
[V]
[A]
⑬ When the practice is over turn off all the switches and remove connected cables.
Also dispart all the components and keep them safely in a designated place.
6. Assessment Questions
① Is induced electromotive force caused by 2-pole armature, an AC or DC?
② In DC generator, state the need for commutator and its mechanism.
③ In a generator, what’s the relationship between the rotation direction of armature and
its polarity?
④ If the rotation direction of armature is set in one specific direction, what happens to the
polarity of induced electromotive force when N-pole and S-pole of a permanent magnet
changes?
Field-winding DC Shunt Generator
1. Purpose
Understand the circuit composition of a field creation of generator that uses DC
Self-excited Shunt generator instead of a permanent magnet and find out the changes and
impacts caused through hands-on experiences
2. Components
① Field Resistor Module(CPE-ER1500-8) : 1set
② DC/AC machine load Module(CPE-ER1500-10) : 1set
③ Power Supply Module(CPE-ER1500-13) : 1set
④ DC Voltmeter/Amperemeter Module(CPE-ER1500-15) : 1set
⑤ Yoke Frame Module(CPE-ER1500-17) : 1set
⑥ Drive Motor Module(CPE-ER1500-18) : 1set
⑦ DC Machine Graphic Board(CPE-ER1500-2) : 1set
⑧ 2-pole rotator(AM2) : 1set
⑨ large field-winding magnetic pole(AMA) : 2set
⑩ field-winding/700(AME) : 2set
⑪ brush & holder H(AMH) : 1set
⑭ rotator rack(AMJ) : 1set
⑮ magnetic pole rack(AMK) : 2set
⑯ fixing bolt(AML) : 3set
⑰ operation belt(AMN) : 1set
⑱ 8mm spanner(AMM) : 1set
⑲ Oscilloscope(Option) : 1set
3. Precautions
① Protect field-winding and electromagnetic armature winding coil from external damages.
② Keep field resistor that controls field current at its maximum value before starting the
experiment.
③
Go through the precautions in exercise 4-3 before starting the experiment.
4. Components of practice circuit
① Module Composition and circuit diagram
Figure 4-8 Connection Diagram of DC Shunt Generator
② Circuit Diagram
Figure 4-9 DC Shunt Generator Circuit
5. Procedures
① Understand the given problems and objectives to select appropriate components.
②
Set
up
Power
Supplier,
Field
Resistor,
DC/AC
machine
unit,
DC
Voltmeter/Amperemeter, Drive Motor, Yoke Frame Module on the practice board rack as
shown in the figure 4-8.
③ Place Rotator Rack (AMJ) in the middle hall of Yoke Frame and use hands to put P1 and P5
into the magnetic pole rack (AMK) and fix it firm by using a spanner provided.
④ Place Field winding/700 turns into large field-winding magnetic pole rack (AMK) and fix P1
and P5 by using fixing bolt into it. (Refer to 4-10)
(a) Strcuture of
frameboard diagram
(c) Motor Drive and AC machine yoke
Figure 4-10 Assembly Drawing of DC Shunt Generator by Field-winding
⑤ Place 2-pole armature into rotator rack (AMJ) of Yoke frame. (Refer to figure 4-10)
⑥ Put in the plugs of DC Machine Graphic Board (CPE-ER1500-2) into the sockets on a
yoke frame as shown in 4-10 a) (Field coil will automatically be connected to T1 and T2
sockets of board.)
⑦ Connect Motor Pulley of Drive Motor and pulley of 2-pole rotator through Operation Belt
(AMN).
⑧ Connect Brush & Holder H (AMH) to commutator of 2-pole rotator and fix it firm using a
fixing bolt. (If brush doesn’t fit well due to the axis of rotator, pull one side of connecting
wire to make some space and try to fit it again)
⑨ Use A,B connection cord to connect T3 and T7 sockets of DC Machine Board.
⑩ Connect the circuits as shown in Figure 4-9 for DC shunt generator (refer to Figure 4-8)
⑪ Keep the following instructions before turning ON the Drive Motor.
- Speed controller VR of drive motor should be at MIN.
- Rotation Direction of drive motor should be at CCW
- VR of Field Resistor should be at the maximum resistant value.
- Lamp socket(L2) of Load Unit should be connected with 6[V] Blub.
- Measuring socket of DC Voltmeter should be set at 10[V] and 1[A].
- Oscilloscope should be connected to T6 and T9 sockets of DC Graphic Board,
Measuring Range should be set at DC 5[Vp-p]/5[ms].
⑫ Connect AC 12[V] OUTPUT socket of Power Supply to the third socket. Connect 5th and
6th socket to each other. It will make DC OUTPUT socket to provide DC 16[V] to fieldwinding circuits.
⑬ Turn ON the Power Supply. Here, PL lamp will turn off and the gradation of DC Voltmeter
will point at 15~16[V].
⑭ Turn ON the Drive Motor. Check if PL lam is turned off and put VR of Speed Controller
at Clockwise and slowly turn it to fit it at the middle. Here, slowly control VR to keep the
speed meter at 1500[rpm].
⑮ DC Generator will not generate yet. The reason is that the field is not being maintained.(Due
to residual magnetism, socket voltage might occur.)
⑯ Slowly turn Field Resistor clockwise to check increase in a field current and also note the
changes in the induced electromotive force E. Explain the relationship between field current
and induced electromotive force E.
⑰ Drastically decrease the speed of drive motor, change rotation direction from CCW → CW
and increase the speed up to 1500[rpm]. Is there any change in the output polarity of
induced electromotive force compared to the previous one?
⑱ From Practice Steps ⑰, what happens if T1 and T2 connection cords of DC Machine
Graphic Board (CPE-ER1500-2) are exchanged – the direction of current on field coil is
reversed, what happens to the polarity of induced electromotive force?
⑲ If field current is set at “0” does the socket of generator show voltage? If so, explain why.
⑳ Once the practice is over, turn OFF all the switch and remove connected cords. Discard
all the components and put them safely in designated areas.
6. Assessment Questions
① Explain the related factors of induced electromotive force of AC excited shunt generator and
their relationships in formula.
② What would be an way to change the output polarity of DC shunt generator?
Rotary Field Three-phase Generator
1. Purpose
Learn about the structure of an excitation DC power three-phase generator.
2. Components
① Field Resistor Module(CPE-ER1500-8) : 1set
② DC/AC machine load Module(CPE-ER1500-10) : 1set
③ three-phase load Module(CPE-ER1500-11) : 1set
④ Power Supply Module(CPE-ER1500-13) : 1set
⑤ AC voltage/Amperemeter Module(CPE-ER1500-14) : 1set
⑥ Yoke Frame Module(CPE-ER1500-17) : 1set
⑦ Drive Motor Module(CPE-ER1500-18) : 1set
⑧ three-phase Machine Graphic board(CPE-ER1500-1) : 1ea
⑨ 2-pole rotator(AM2) : 1ea
⑩ large field-winding magnetic pole(AMA) : 3ea
⑪ field-winding/300turns(AMD) : 3ea
⑫ brush & holder G(AMG)) : 1set
⑭ rotator rack(AMJ) : 1ea
⑮ magnetic pole rack(AMK) : 3ea
⑯ fixing bolt(AML) : 4ea
⑰ operation belt(AMN) : 1ea
⑱ 8mm spanner(AMM) : 1ea
3. Precautions
① AC excitation voltage should not be more than DC 9V. If excitation voltage is too high, it
may damage the bulb.
② In order to keep induced electromotive force of a generator less than 6[V], Speed of a Drive
Motor should be kept less than 1500[rpm].
4. Components of practice circuit
① Module Composition and circuit diagram
Figure 4-21 rotary field three-phase AC Generator Connection Diagram
② rotatory field three-phase generator field circuit
Figure 4-22 Three-phase generator Assembly Drawing
5. Procedures
① Understand the given problems and objectives to select appropriate components.
② Set up 6 type module in a practice rack as shown in the Figure 4-21
③ Proceed step ③~④ of exercise 4-9 (Refer to figure 4-22)
④ Place 2-pole rotator into rotator rack (AMJ) of Yoke frame and put three-phase Machine
Graphic board (CPE-ER1500-1) plus into field-winding socket. (Three-phase Armature coil
will automatically be connected to T1~T12 sockets)
⑤ In order to operate 2-pole rotator automatically, Motor Pulley of Drive Motor’s rotator should
be connected to operation belt (AMN).
⑥ Brush & Holder G of Slip Ring in 2-pole rotator should be set horizontally. Fix it with a fixing
bolt (AML).
⑦ Connect circuits referring to Figure 4-21 and 4-22. (i.e. DC Voltage of rotatory field circuit
is provided to 2-pole rotator (rotatory field) and create exiting current and make A phase B
phase C phase’s output sockets to be connected with bulb (6.3V) of DC/AC machine load
Module.
⑧ Keep the resistance value of Field Resistor Module(CPE-ER1500-8) at its maximum and
run Drive Motor Module(CPE-ER1500-18). At this point, keep the rotation speed a
1200[rpm] and turn VR in a clockwise to create exiting current and voltage to light up the
lamp. Control rotation speed of field resistor and current of field coil and observe induced
electromatic force. (Make the output voltage does not exceed 6[V])
⑨ Turn OFF the exiting power and stop Drive Motor and exchange the load module with
three-phase load and △ connect as shown in the diagram 4-23.
Figure 4-23 Three-phase generator load and △ Connection
⑩ Connect Lamp Socket L1, L2, L3 (△connection) of three-phase load module (CPEER1500-11) to a loading 6.3V bulb (AMP). Turn ON the Power Supplier and Drive Motor
and turn Field Resistor in a clockwise direction so that the field current is at its maximum.
Here, slowly increase the speed of drive motor and observe the relationship with induced
electromotive force.
⑪ Turn OFF the Power Supply and Drive Motor and keep Field Resistor
to its maximum
level.
⑫ This time, connect three-phase load with Y-connected generator output as shown in Figure 424.
Figure 4-24 Three-phase generator Y connection / Load △ Connection
⑬ As proceeding Practice Step ⑩, control the speed of Drive Motor to set V1 at 3[V]. At
this point, what would be the value of V2?
․ V1 = [V]
․ V2 = [V] How many times is V2 bigger than V1?
․ = times
⑭ Turn Off the exiting power and stop the Drive Motor. Connect the circuits as shown in
the Figure 4-25.
Figure 4-25 Three-phase generator and load Y connection
⑮ As proceeding Practice Step ⑩, control the speed of Drive Motor to set V1 at 3[V]
․ V1 = [V]
․ V2 = [V] How many times is V2 bigger than V1?
․ = times
⑯ When Y-connected three-phase generator’s load connection is done as shown in Figure 4-24,
Is there any difference in the brightness of a bulb between △ connection and Y connection as
Figure 4-25? Explain the reason.
⑰ When the experiment gets over, turn OFF all the switches and remove connected cords. Place
the components safely in designated areas.
6. Assessment Questions
① The magnitude of voltage between circuits changes according to the connection methods in
three-phase generator. Between Y connection and △ connection, which should be chosen
when a high voltage is needed? If it is changed to △ connection from Y connection, how
many times is voltage smaller/bigger?
② If the voltage between circuits of three-phase power is AC 380V, 3sets of bulb 220V is to be
connected. For load connection, which connection should be used – Y connection or △
connection? Draw a circuit and explain
③ Whats the advantage of using three-phase compared to using single-phase?
Rotatory Armature Type Three-phase AC Generator
1. Purpose
Find out the structure and mechanism of Rotary Armature three-phase AC and find
the difference with the previous rotary field circuits.
2. Components
① Field Resistor Module(CPE-ER1500-8) : 1set
② three-phase load Module(CPE-ER1500-11) : 1set
③ Power Supply Module(CPE-ER1500-13) : 1set
④ AC Voltmeter/Amperemeter Module(CPE-ER1500-14) : 1set
⑤ DC Voltmeter/Amperemeter Module(CPE-ER1500-15) : 1set
⑥ Yoke Frame Module(CPE-ER1500-17) : 1set
⑦ Drive Motor Module(CPE-ER1500-18) : 1set
⑧ rotary converter Graphic board(CPE-ER1500-3) : 1set
⑨ three-phase rotator (AM3) : 1ea
⑩ Field-winding rotator (AM4) : 1ea
⑪ large field-winding magnetic pole(AMA) : 2ea
⑫ field-winding/700 turns (AME) : 2ea
⑬ brush & holder G(AMG) : 1set
⑮ rotator rack(AMJ) : 1ea
⑯ magnetic pole rack(AMK) : 2ea
⑰ fixing bolt(AML) : 3ea
⑱ operation belt(AMN) : 1ea
⑲ 8mm spanner(AMM) : 1ea
⑳ Oscilloscope(Option) : 1set
3. Precautions
① When plugging the field coil sockets on a rotary converter board, hold the two ends
and set up slowly keeping the both forces equal.
② Make sure there is some space between three-phase armature and magnetic pole while
setting up.
③ Avoid touching or letting connection cord stuck in the rotating three-phase armature or
belt part.
4. Components of practice circuit
① Module Composition and circuit diagram
Figure 4-26 rotatory armature three-phase AC Generator Connection diagram
② Circuit Diagram
Figure 4-27 Rotatory armature three-phase generator circuit diagram
5. Procedures
① Understand the given problems and objectives to select appropriate components.
② Set up 7 types of Module in a practice board rack as shown in the figure 4-26.
③ Put rotator Rack (AMJ) in the middle hall of Yoke Frame, and place magnetic pole rack
(AMK) in P1 and P5. Use Spanner to fix it firm.
④ Put field Coil/700 turns (AME) into field-winding magnetic pole and place it into
magnetic pole rack (AMK)’s P1 and P5 of Yoke Frame as shown in the figure 4-28.
Figure 4-28 Rotatory armature generator set-up diagram
⑤ Equip three-phase armature into rotator rack (AMJ) of Yoke Frame.
⑥ Put Rotary Converter board plug into field-winding plugs. (Field coil will automatically
be connected to T3, T5 and T6 of the board.)
⑦ In order to connect Drive Motor and Rotator, utilize Drive Belt (AMN).
⑧ Put Brush & Holder G into the slip ring of three-phase armature. Fix it firm with fixing
bolt (AML).
⑨ Connect the circuit as shown in the Figure 4-27. Here, bulb used for three-phase load is
6.3[V] and should be connected to △ Connection circuit.
⑩ Control Field Resistor to keep exiting power V1 at 7[V] and slowly operate Drive Motor.
(Here, rotation speed of generator should not be more than 1500[rpm]. If it exceeds,
voltage V2 will be generated more than 6[v] and cause damage in the load)
⑪ Change rotation speed of Rotatory armature and observe the changes in brightness and
lighting speed. Connect Oscilloscope with three-phase load Module 5,6 and 3,4 sockets
and observe the ripples.
⑫ This time, change armature from three-phase armature to field-winding armature and
repeat the steps ⑩~⑪ and compare the results.
⑬ When the experiment gets over, turn OFF all the switches and remove connected cords.
Place the components safely in designated areas.
6. Assessment Questions
① From the exercise above, what affects the frequency of three-phase induced
electromotive force? Exiting current or the speed of rotatory armature?
② In the exercise, how does size of three-phase induced electromotive force affect exiting
current, its magnitude and rotation speed?
Series Motor using Field Coil
1. Purpose
Understand how to set up field coil and Armature coil of DC Series Motor and learn
characteristics and structure of DC Series Motor.
2. Equipments and accessories
① Startup resistor module(CPE-ER1500-9) : 1set
② Power supply module(CPE-ER1500-13) : 1set
③ DC power voltmeter/ammeter module(CPE-ER1500-15) : 1set
④ Yoke frame module(CPE-ER1500-17) : 1set
⑤ DC machine graphics board(CPE-ER1500-2) : 1set
⑥ Wound rotor(AM4) : 1ea
⑦ Wound field magnet with wide magnetic pole (AMA) : 2ea
⑧ Field coil/300 times(AMD) : 2ea
⑨ Brush & Holder H(AMH) : 1set
⑩ Rotor holder(AMJ) : 1ea
⑪ Magnetic pole holder(AMK) : 2ea
⑫ Bolt(AML) : 3ea
⑬ 8mm Spanner(AMM) : 1ea
3. Precautions
Ⅰ.
Since it works at no load conditions,
mechanical stress from high-speed rotation.
make
sure there
is no
Ⅱ. When installing brush and holder H on rotor commutator, make sure magnetic
pole extension lines are slightly off.
Ⅲ. Make sure not to damage the insulation sheath on would rotor. Ⅳ. Set
up appropriate measuring terminals for DC voltmeter/ammeter.
4. Components of circuit
① Module formation/ Wiring diagram
Figure 6-5 Series Motor by field coil connection diagram
② Circuit diagram
Figure 6-6 Series Motor by field coil
5. Procedure
① Understand the questions and the purpose of the exercise and choose the appropriate
materials.
② First, install four modules on the board rack as shown in the figure 6-5.
③ Insert rotor holder(AMJ) in the center hole of yoke frame and magnetic pole holder in P1
and P5.
④ Set up field coil/300 times (AMD) on wound field magnet with wide magnetic pole (AMA).
Then, assemble and tighten this with bolt(AML) this on P1 and P5 of magnetic pole
holder(AMK) of yoke frame (Refer to the figure 6-5 yoke frame module assembly)
⑤ Attach wound rotor on yoke frame rotor holder(AMJ).
⑥ Before assembling brush & holder H, plug DC machine graphics board(CPE-ER15002) into terminal hole of field coil (field coil will automatically connect to T1, T2
sockets).
⑦ Install brush and holder H on rotor commutator as shown in the figure 6-5 (magnetic pole
extensions 45° off).
⑧ Assemble series motor circuit by referring to the figures 6-5 and 6-6.
⑨ Under no error condition, put resistance value of the motor resistor to the maximum value
and turn on the power supplier.
⑩ Turn
VR
of
motor resistor to
the
clockwise
slowly reducing
the resistance value.
What is the Armature current value[A] when the motor is running?
․ Current [A]
After the motor reaches the steady level, what is the Armature current value[A]?
․ Current [A]
Which direction does the motor rotate to?
․ Direction
⑪ Observe how the motor speed changes as the resistance value on the resistor changes while
the motor is running.
⑫ Stop the motor and switch the polarity of the Armature. Then repeat steps ⑬~⑭. (In order
to reverse the direction of the current flowing in Armature coil, switch cord A and B
connected to brush & holder H(AMH).
⑬ Stop the motor and switch the T1 and T2 sockets of series field on DC machine graphics
board(CPE-ER1500-2). Then, turn on the motor again. In other words, current direction of
the field coil has been switched. What happens to the rotating direction of the motor?
⑭ When all the steps have been practiced, turn off all the machinaries and remove the cords.
Also, remove the equipments and accessories to the module cabinet and the appropriate
place on the table.
6. Questions
① What happens to the field current when Armature current decreases from series motor like
step ⑩?And what can you infer from this phenomenon?
② What problem would you face if series motor is run in no load condition? Explain the
reasoning.
③ How can you change the rotating direction of the series motor?
④ Explain why starting torque of series motor is big.
DC Compound Motor
1. Purpose
Learn characteristics and the structure of DC compound motor, and the way to
connect field magnet and Armature coil of DC compound motor.
2. Equipments and accessories
① Field magnet resistor module(CPE-ER1500-8) : 1set
② Starting resistor module(CPE-ER1500-9) : 1set
③ Power supply module(CPE-ER1500-13) : 1set
④ DC voltmeter/ammeter module(CPE-ER1500-15) : 1set
⑤ Yoke frame module(CPE-ER1500-17) : 1set
⑥ Compound motor graphics board(CPE-ER1500-4) : 1set
⑦ Wound rotor(AM4) : 1ea
⑧ Wide magnetic pole for field coil(AMA) : 2ea
⑨ Field coil/300 times(AMD) : 1ea
⑩ Field coil/700 times(AME) : 1ea
⑪ Brush & holder H(AMH) : 1set
⑫ Rotor holder(AMJ) : 1ea
⑬ Magnetic pole holder(AMK) : 2ea
⑭ Bolt(AML) : 3ea
⑮ 8mm Spanner(AMM) : 1ea
3. Precautions
Precautions
Ⅰ. When connecting field coil, use series would field to connect field coil/300
times and use shunt field for field coil/700 times.
Ⅱ. Control field resistor appropriately because motor will not start if the field
current is too big.
Ⅲ. Read precautions from section 6-4 before proceeding to this section.
4. Components of circuit
① Module formation/ Wiring diagram
Figure 6-9 Compound Motor Connection Diagram
② Circuit diagram
Figure 6-10 Compound Motor Practice Circuits
5. Procedure
① Understand the questions and the purpose of the exercise and choose the appropriate
materials.
② Install 5 modules on the board rack as shown in the figure 6-9.
③ Insert rotor holder(AMJ) in the center hole of yoke frame and two of the magnetic pole
holders(AMK) in P1 and P5 (Use spanner to make sure holders do not move).
④ Assemble field coil/300 times(AMD) on wide magnetic pole for field coil(AMA) and
put this on P1 of yoke frame. Assemble field coil/700 times(AME) in magnetic pole
onto P5.
⑤ Install wound rotor on the rotor holder(AMJ) of the yoke frame. Then, using
bolt(AML), tighten magnetic pole with a fixed gap so it does not move. (Refer to the
figure 6-9 yoke frame module)
⑥ Before assembling brush & holder H(AMH), put compound motor graphics board into
the field coil terminal hole (Series would field and shunt field should automatically
connect to the circuit on the board).
⑦ Put brush and holder H(AMH) on rotor commutator so that the brush forms 45° with
the extensions of magnetic poles as shown in the figure 6-9.
⑧ Refer to the figures 6-9 and 6-10 to set up compound motor circuit.
⑨ Set resistance value of field resistor to approximately 15 ~ 30[Ω]. Then, set the
resistance value of the starting resistor to the maximum value before turning on the
power supplier. Turn on the power supplier.
⑩ First make short of both terminals on starting resistor.
Measure the current and voltage.
Is = [A]
V = [V]
⑪ Turn off the power supplier and remove the wire(단락선) on the starting resistor.
Turn on the power supplier. This time, slowly decrease the resistance value of the
starting resistor to the minimum value.
⑫ Measure the current and voltage when it is at steady state.
Is = [A]
V = [V]
⑬ Increase and decrease the resistance value of field resistor and observe the rotating
speed of the motor.
⑭ Stop the motor, switch the Armature wiring of A and B, and restart the motor (Switch
the cords on compound motor graphics board on terminal T5 and T10). Why did the
rotating direction of the motor change?
⑮ When all the steps have been performed, turn off all the switches and remove the
connecting cords. Also, remove the equipments and accessories to the module cabinet
and the appropriate place on the table.
6. Questions
① Explain how to wire shunt field and series field using compound motor and why it
should be done this way.
② Explain 3 factors that affect speed N of DC motor.
③ Explain briefly the characteristics and the types of compound motor.
Spilt-Phase Motor
1. Purpose
Understand the structure of Spilt-Phase Motor and by learning how to operate singlephase induction motor, understand how to run spilt-phase motor and condenser
2. Equipments and accessories
① Power Supplier Module(CPE-ER1500-13) : 1set
② AC Voltmeter/Amperemeter Module(CPE-ER1500-14) : 1set
③ Yoke Frame Module(CPE-ER1500-17) : 1set
④ Spilt-Phase Motor Graphic Board(CPE-ER1500-7) : 1set
⑤ Cage Rotor(AM5) : 1ea
⑥ Field-winding large magnet pole(AMA) : 2ea
⑦ Field-winding narrow magnet pole(AMB) : 2ea
⑧ Field-winding/300turns(AMD) : 2ea
⑨ Field-winding/1700turns(AMF) : 2ea
⑩ Rotator Rack(AMJ) : 1ea
⑪ Magnetic Pole Rack(AMK) : 4ea
⑫ Fixing Bolt(AML) : 4ea
⑬ 8mm Spanner(AMM) : 1ea
3. Precaution
Precaution
Ⅰ. Single-phase induction motor does not have maneuver torque so it
should use maneuver coil or main coil to make 2-Phase or connect condensor to
maneuver coil in series to create rotatory magnetic field and maneuver torque
Ⅱ. Condensor's maneuver motor has a large maneuver torque while Spilt-Phase
Motor has a weak one.
Ⅲ. Make sure not to exchange maneuver coil and main coil when setting
up field coil.
4. Practice Circuits Composition
① Module Composition Connection Diagram
Figure 6-24 Spilt-Phase Motor Connection Diagram
② Circuit Diagram
Figure 6-25 Spilt-Phase Motor Practice Circuits
5. Procedure
① Understand the given problem and objective. Select equipments and accessories.
② Set up 3 Module and Spilt-Phase Motor Graphic Board on a practice board rack as shown
in Figure 6-24.
③ Set up field coil, magnetic pole and rotators in a yoke frame as shown in Figure 6-26.
Here, the distance between rotator and magnetic pole should be minimized.
Figure 6-26 Spilt-Phase Motor Assembly Drawing
④ Place Spilt-Phase Motor Graphic Board on socket hall of field coil.
⑤ Set up practice circuits as shown in Figure 6-24 and 6-25. Check the connection status of
each module and turn ON the Power supplier. Provide AC 50[V].
⑥ To test spilt-phase starting system, short-circuit between T5 and T6 of Spilt-phase motor
graphic board. (As mentioned previously, spilt-phase starting system as a weak maneuver
torque, so turn it little manually.)
⑦ About 75% of previous speed opens maneuver winding circuit by centrifugal force switch.
⑧ This time, to test condensor starting system, connect T5, T6 to condensor C1 2.5 [ ㎌ ]
and run it. Compared to the procedure ⑥, does it work well?
⑨ Exchange condensor C1 2.5[㎌] with C2 4.5[㎌] and run it. Does it work well? Which one
works better?
⑩ This time, stop the drive motor and remove Spilt-Phase Motor Graphic Board and
exchange the polarity of maneuver coil. Connect the circuits for rotating direction
exchange experiment as shown in the Figure 6-27.This means that maneuver coil polarity
A, B are exchanged as shown in Figure 6-25.
Figure 6-27 Spilt-Phase Motor Rotation Direction Control
⑪ Check circuit's connection status and connecting cords are not stuck with each other and
turn ON the Power SupplierDid the rotation direction change?
⑫ Upon completion of the experiment, turn OFF all the switches and removed connected
cords. Discard the components and safely keep them in designated areas.
6. Assessment Questions
① State spilt-phase induction motor's operation methods and its differences
② Explain how to change the rotation direction of spilt-phase motor.
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