PG1995
Active Member
Hi,
The following windings are popular for a dc machine but I think they could also be used for ac commutator machine, i.e. universal motor. (It's not as simple to run a universal motor as a dc/universal generator[3]). I'm going to focus on dc machine.
Source: https://www.slideshare.net/khairulazharRasid/chapter4-dc-motor
Let's focus on lap winding first. I have read some conflicting points about the lap winding. I really appreciate your help and time. Thank you.
Question 1:
At some places it is said that there are two types of lap winding - simplex and duplex. Some sources say that the types are: simplex, duplex, and multiplex. Which one is true or which is considered more mainstream?
Question 2:
Likewise, some sources say the parallel path in lap winding are twice the number of poles. But other sources say that number of parallel paths are same as the number of poles in simplex and twice the number of poles in duplex winding. Which statement is correct?
Question 3:
I have some related questions about the picture below.
How many parallel current paths are there and how do you define the term 'parallel current path'? For example, the source below picture has been taken from says the following.
"A winding in which the number of parallel path between the brushes is equal to the number of poles is called simplex lap winding.
A winding in which the number of parallel path between the brushes is twice the number of poles is called duplex lap winding."
In my opinion, the parallel current paths denotes the number of parallel currents path connections for each brush. But the problem is that in the picture below, there are only two such connections for each brush.
Source: https://www.electrical4u.com/lap-winding-simplex-and-duplex-lap-winding/
Question 4:
The segment of this video from 10:07 - 11:27 explains the shift of neutral plane and armature reaction.
In the shown winding above, there are eight commutator segments and four brushes. Does the problem of armature reaction also occur in such a lap winding when a brush comes in contact with two commutator segments. For example, the left most brush is shown making a connection only with commutator segment #1. What would happen when the brush is making connection with segments, 1 and 2?
Question 5:
I understand that in the picture below, an armature surface (possibly cylindrical surface) has been projected onto a 2D plane.
i: The coil marked red is basically a single coil consisted of many turns and not just one turn. Right?
ii: Physically, commutator segment #1 would be next to segment #8. Right?
iii: You see open ends in yellow, 2, 2, 4. There are other open ends in orange, 2, 15, 15. I understand that these ends connect to each other to complete the winding but still I couldn't make sense of their interconnections.
Helpful links:
1: https://www.quora.com/What-is-an-ac-commutator-motor
2: https://www.slideshare.net/khairulazharRasid/chapter4-dc-motor
[3]https://electronics.stackexchange.com/questions/361983/universal-motor-as-dc-generator
pole pitch commutator pitch
4: **broken link removed**
5: https://www.electrical4u.com/armature-winding-pole-pitch-coil-span-commutator-pitch/
6: https://www.quora.com/What-is-number-of-parallel-paths-in-DC-machine
7: /watch?v=wex3ZenASl0
8: https://www.quora.com/How-is-number...p-and-wave-winding-found-in-a-generator-motor
9: https://www.watelectrical.com/armature-winding-types-applications/
10: https://www.electrical4u.com/lap-winding-simplex-and-duplex-lap-winding/
11: https://circuitglobe.com/difference-between-lap-and-wave-winding.html
12: https://electronicspani.com/equalizer-connections-in-lap-winding/
13: https://www.quora.com/What-is-the-use-of-an-equalizer-ring-in-a-DC-machine
14: https://www.myelectrical2015.com/2017/09/dummy-coils.html
15: https://www.quora.com/What-is-the-difference-between-simplex-and-duplex-lap-winding
16: https://www.electrical4u.com/wave-winding/
17: https://imagizer.imageshack.com/img921/2823/XS8tms.jpg , https://imagizer.imageshack.com/img922/4882/LjpI0a.jpg
18: https://imagizer.imageshack.com/img922/7969/He3trm.jpg , https://imagizer.imageshack.com/img922/9431/F2Iu0n.jpg
19: https://web.eecs.utk.edu/~tolbert/teaching/ece321/handouts/armature.pdf (very good)
The following windings are popular for a dc machine but I think they could also be used for ac commutator machine, i.e. universal motor. (It's not as simple to run a universal motor as a dc/universal generator[3]). I'm going to focus on dc machine.
Source: https://www.slideshare.net/khairulazharRasid/chapter4-dc-motor
Let's focus on lap winding first. I have read some conflicting points about the lap winding. I really appreciate your help and time. Thank you.
Question 1:
At some places it is said that there are two types of lap winding - simplex and duplex. Some sources say that the types are: simplex, duplex, and multiplex. Which one is true or which is considered more mainstream?
Question 2:
Likewise, some sources say the parallel path in lap winding are twice the number of poles. But other sources say that number of parallel paths are same as the number of poles in simplex and twice the number of poles in duplex winding. Which statement is correct?
Question 3:
I have some related questions about the picture below.
How many parallel current paths are there and how do you define the term 'parallel current path'? For example, the source below picture has been taken from says the following.
"A winding in which the number of parallel path between the brushes is equal to the number of poles is called simplex lap winding.
A winding in which the number of parallel path between the brushes is twice the number of poles is called duplex lap winding."
In my opinion, the parallel current paths denotes the number of parallel currents path connections for each brush. But the problem is that in the picture below, there are only two such connections for each brush.
Source: https://www.electrical4u.com/lap-winding-simplex-and-duplex-lap-winding/
Question 4:
The segment of this video from 10:07 - 11:27 explains the shift of neutral plane and armature reaction.
In the shown winding above, there are eight commutator segments and four brushes. Does the problem of armature reaction also occur in such a lap winding when a brush comes in contact with two commutator segments. For example, the left most brush is shown making a connection only with commutator segment #1. What would happen when the brush is making connection with segments, 1 and 2?
Question 5:
I understand that in the picture below, an armature surface (possibly cylindrical surface) has been projected onto a 2D plane.
i: The coil marked red is basically a single coil consisted of many turns and not just one turn. Right?
ii: Physically, commutator segment #1 would be next to segment #8. Right?
iii: You see open ends in yellow, 2, 2, 4. There are other open ends in orange, 2, 15, 15. I understand that these ends connect to each other to complete the winding but still I couldn't make sense of their interconnections.
Helpful links:
1: https://www.quora.com/What-is-an-ac-commutator-motor
2: https://www.slideshare.net/khairulazharRasid/chapter4-dc-motor
[3]https://electronics.stackexchange.com/questions/361983/universal-motor-as-dc-generator
pole pitch commutator pitch
4: **broken link removed**
5: https://www.electrical4u.com/armature-winding-pole-pitch-coil-span-commutator-pitch/
6: https://www.quora.com/What-is-number-of-parallel-paths-in-DC-machine
7: /watch?v=wex3ZenASl0
8: https://www.quora.com/How-is-number...p-and-wave-winding-found-in-a-generator-motor
9: https://www.watelectrical.com/armature-winding-types-applications/
10: https://www.electrical4u.com/lap-winding-simplex-and-duplex-lap-winding/
11: https://circuitglobe.com/difference-between-lap-and-wave-winding.html
12: https://electronicspani.com/equalizer-connections-in-lap-winding/
13: https://www.quora.com/What-is-the-use-of-an-equalizer-ring-in-a-DC-machine
14: https://www.myelectrical2015.com/2017/09/dummy-coils.html
15: https://www.quora.com/What-is-the-difference-between-simplex-and-duplex-lap-winding
16: https://www.electrical4u.com/wave-winding/
17: https://imagizer.imageshack.com/img921/2823/XS8tms.jpg , https://imagizer.imageshack.com/img922/4882/LjpI0a.jpg
18: https://imagizer.imageshack.com/img922/7969/He3trm.jpg , https://imagizer.imageshack.com/img922/9431/F2Iu0n.jpg
19: https://web.eecs.utk.edu/~tolbert/teaching/ece321/handouts/armature.pdf (very good)
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