Page 3 - Table of Contents
012-07210 A Permanent Magnet Motor i ® Table of Contents Section ...................................................................................................... Page Copyright and Warranty, Equipment Return ................................................. i i Introduction ......................
Page 4 - Copyright Notice; Copyright, Warranty, and Equipment Return; Please—; Credits
Permanent Magnet Motor 012-07210 A ii ® Copyright Notice The PASCO scientific Permanent Magnet Motormanual (012-07210A) is copyrighted and all rightsreserved. However, permission is granted to non-profiteducational institutions for reproduction of any part ofthe manual providing the reproductions ar...
Page 5 - Equipment; The Permanent Magnet Motor includes; field magnet, shaft and brush assembly; Safety precautions
1 012-07210A Permanent Magnet Motor Equipment Introduction The PASCO SE-8658A Permanent Magnet Motoroperates on AC or DC current, and it can be used togenerate alternating or direct current. Students can not only explore properties of AC and DCgenerators with this apparatus, they can also discover k...
Page 6 - Table 1. Equipment Options for Experiments 1– 3
2 Permanent Magnet Motor 012-07210A Table 1. Equipment Options for Experiments 1– 3 ➤ NOTE: Although the instructions for experiments in this manual are for mechanical setups with specific PASCO equipment, the experiments in this manual may be set up in a variety of ways,depending upon the equipment...
Page 7 - Starting the motor; Operation; Options for electrical connections; NOTE: If you are using a PASCO
3 012-07210A Permanent Magnet Motor Starting the motor • The motor is not self-starting. Immediately after you apply the power, start the motor manually bygrasping the black plastic bushing at the top of thearmature assembly between your thumb andforefinger and spinning the armature. • With the Perm...
Page 8 - Locate the part shown in the diagram below.; Initial Assembly; Gently lower the armature onto the shaft. To make; The motor may be left assembled for storage.
4 Permanent Magnet Motor 012-07210A Initial Assembly of Permanent MagnetMotor 1. Locate the part shown in the diagram below. Initial Assembly 2. Gently lower the armature onto the shaft. To make a DC motor, the split ring commutator should bedown; for an AC motor, the dual slip-ringcommutator should...
Page 9 - Operation as a DC motor; Suggested Uses; Operation of a synchronous AC motor
5 012-07210A Permanent Magnet Motor Operation as a DC motor The Permanent Magnet Motor can be used todemonstrate the operation of a DC motor ( Experiment1). Students can explore relationships between motorspeed and voltage, as well as between direction ofarmature rotation and polarity, learning key ...
Page 11 - •Permanent Magnet Motor; Purpose; Gently lower the armature onto the shaft with the; Experiment 1: Operation of the DC Motor
7 012-07210A Permanent Magnet Motor Figure 1.1 Assembly of the Permanent Magnet Motor armature brushes dual slip -ringcommutator split ringcommutator fieldmagnets shaft retaining nut EQUIPMENT NEEDED: •Permanent Magnet Motor • low voltage DC power supply, limited to 1 A • patch cords • multimeter • ...
Page 12 - Procedure—Part A; Rotate the armature and observe how the
8 Permanent Magnet Motor 012-07210A Procedure—Part A 1. Rotate the armature and observe how the segments of the split ring commutator contactthe brushes as the armature turns. 2. Remove the armature from the shaft by grasping it between your thumb and forefinger and rotating it back and forth while ...
Page 14 - touches the different sides of the split ring commutator?
10 Permanent Magnet Motor 012-07210A 7. Turn the armature over 180° and imagine that the brush attached to the + lead is contacting the other split ring of the commutator. Note the path of the wire from where it is attached to the split ring towhere it enters and exits from the coil on the right sid...
Page 15 - Procedure—Part B; Turn on the power. Adjust the output voltage to 6 volts.
11 012-07210A Permanent Magnet Motor Procedure—Part B 1. Turn on the power. Adjust the output voltage to 6 volts. 2. Use the small cylindrical ceramic magnet to check your predictions from steps 5 and 6 above. The painted face of the magnet is its North Pole (north-seeking pole). [You can verify thi...
Page 17 - Experiment 2: Operation of AC and DC Generators
13 012-07210A Permanent Magnet Motor EQUIPMENT NEEDED OPTIONAL EQUIPMENT • Permanent Magnet Motor • Voltage Sensor • multimeter or galvanometer • computer interface • patch cords • small strips of masking tape Purpose The purpose of this experiment is to detail the operation of an AC generator and a...
Page 18 - Setup; Connect the motor to the meter by one of these; Procedure; Part A: AC Generator; During the first part of this experiment, the dual
14 Permanent Magnet Motor 012-07210A Setup 1. Gently lower the armature onto the shaft with the dual slip-ring commutator pointed down. Carefully rotate the armature back and forth to separate the brushes and allow the commutator toslip down between them. If necessary, insert a pencil or similar obj...
Page 19 - What does Faraday’s induction law say about this situation?; To
15 012-07210A Permanent Magnet Motor 4. Label the end of the armature that connects to the upper slip ring with a small piece of tape. 5. Gently replace the armature onto the shaft. The dual slip-ring commutator should be down. Carefully rotating the armature back and forth will often separate the b...
Page 20 - taped end of the armature need to be?
16 Permanent Magnet Motor 012-07210A b) To oppose the motion during the second 90 degrees of rotation, which pole (N or S) would the taped end of the armature need to be? 9. In order to cause the armature to act as you stated in step 8 above, which direction would the induced current need to move? a...
Page 21 - Part B: DC Generator; down between the brushes.
17 012-07210A Permanent Magnet Motor Part B: DC Generator 1. Review steps 1 and 5. Then remove the armature and install it with the split ring commutator down between the brushes. 2. Connect the meter and rotate the armature slowly, at a rate of about one complete revolution in two seconds. a) How d...
Page 22 - armature rapidly and let it slow to a stop.
18 Permanent Magnet Motor 012-07210A 4. If you have a PASCO computer interface and Voltage Sensor, try this: a) Predict how a graph of voltage versus time would look if you put the dual slip rings down and spun the armature rapidly and let it slow to a stop. b) What if the split rings were down? c) ...
Page 23 - Experiment 3: Operation of an AC Synchronous Motor
19 012-07210A Permanent Magnet Motor EQUIPMENT NEEDED • Permanent Magnet Motor • multimeter • patch cords • corrugated cardboard • Digital Stroboscope or • power source that will deliver both Digital Photogate Timer DC and AC current limited to 1.0 A Purpose The purpose of this experiment is to demo...
Page 24 - Examine the armature closely and imagine current entering
20 Permanent Magnet Motor 012-07210A allow the commutator to slip down between them. If necessary, insert a pencil or similarobject down between the brushes. Use only the most delicate force to avoid bending thebrushes and necessitating adjustments or repairs. Procedure—Part A 1. Remove the armature...
Page 25 - Connect the motor to the power
21 012-07210A Permanent Magnet Motor 7. Turn the armature over 180° and imagine that the AC current is in the positive half of the waveform. Note the path of the wire from where it is attached to the slip ring to where it entersand exits from the coil on the left side of the armature. Use the right-...
Page 26 - teacher’s instructions.
22 Permanent Magnet Motor 012-07210A 3. Now set the power source to furnish to the brushes on alternating current with a sinusoidal waveform at a frequency of about 30 Hz and voltage of about 6 volts. Slowly rotate the armatureby hand through one complete revolution. a) Describe the sensation you fe...
Page 27 - armature change when you change the voltage?
23 012-07210A Permanent Magnet Motor tape. Slip the square part far enough way down the split ring commutator so you can gripthe plastic bushing to spin the armature. Position the photogate so the corners of the squareinterrupt the photogate’s beam 4 times per revolution. 8. Set the voltage to 8 vol...
Page 29 - Teacher’s Guide; Answers To Questions:; Part A; touches the alternate sides of the split ring commutator.
012-07210 A Permanent Magnet Motor 25 wire connected to the +terminal of the powersupply When you wrapyour fingers in thedirection of the flowof the electriccurrent, yourthumb pointstowards the northpole of themagnetic field. + + Draw arrows indicating the direction ofcurrent flow. Indicate which po...
Page 30 - Part B; Results of the test should agree with predictions.; Experiment 2; a) It must enter the coil from the upper brush.
Permanent Magnet Motor 012-07210 A 26 Part B 3. Results of the test should agree with predictions. 4. Clockwise, if the leads are connected exactly as shown in Figure 2 and the north pole of the field magnets are on the left. 5. a) It should rotate in the counter-clockwise direction.b) Answers will ...
Page 31 - rate; Experiment 3; Notes concerning the setup:
012-07210 A Permanent Magnet Motor 27 Part B: DC Generator 1. a) The voltage and current produced is always in the same direction (direct current) but is pul- sating, not steady. (The pulsating nature will be difficult to note with a digital meter.) As-suming as before that the negative lead of the ...
Page 32 - Opposite; a) It vibrates or pulses at the same frequency, but with less force.
Permanent Magnet Motor 012-07210 A 28 6. Opposite 7. Yes 8. a) The armature’s north pole alternates from end to end as the AC waveform alternates from posi- tive to negative. b) The slip-ring commutator connects the armature to the power source by way of the brushes and enables the current to travel...
Page 33 - Technical Support; Feedback
Technical Support Feedback If you have any comments about the product ormanual, please let us know. If you have any sugges-tions on alternate experiments or find a problem in themanual, please tell us. PASCO appreciates anycustomer feedback. Your input helps us evaluate andimprove our product. To Re...
