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Why does the capacitor affect the speed of the motor?
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I recently watched This video about an air purifier made from an old oscillating fan and at 5:20, he explains that the motor's speed has decreased over the years because the capacitor "isn't as good as it used to be". So he replaced it.
Why does a clapped-out capacitor reduce the speed of an AC motor like that? An alternative perspective on the question: Why is the capacitor there?
motor
asked 1 hour ago
Wilson
1112
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up vote
2
down vote
favorite
I recently watched This video about an air purifier made from an old oscillating fan and at 5:20, he explains that the motor's speed has decreased over the years because the capacitor "isn't as good as it used to be". So he replaced it.
Why does a clapped-out capacitor reduce the speed of an AC motor like that? An alternative perspective on the question: Why is the capacitor there?
motor
asked 1 hour ago
Wilson
1112
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Basically, I have no idea about electrical engineering.
– Wilson
1 hour ago
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I recently watched This video about an air purifier made from an old oscillating fan and at 5:20, he explains that the motor's speed has decreased over the years because the capacitor "isn't as good as it used to be". So he replaced it.
Why does a clapped-out capacitor reduce the speed of an AC motor like that? An alternative perspective on the question: Why is the capacitor there?
motor
asked 1 hour ago
Wilson
1112
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I recently watched This video about an air purifier made from an old oscillating fan and at 5:20, he explains that the motor's speed has decreased over the years because the capacitor "isn't as good as it used to be". So he replaced it.
Why does a clapped-out capacitor reduce the speed of an AC motor like that? An alternative perspective on the question: Why is the capacitor there?
motor
motor
asked 1 hour ago
Wilson
1112
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Wilson
1112
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Wilson
1112
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Wilson
1112
asked 1 hour ago
Wilson
1112
1112
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Basically, I have no idea about electrical engineering.
– Wilson
1 hour ago
add a comment |Â
Basically, I have no idea about electrical engineering.
– Wilson
1 hour ago
Basically, I have no idea about electrical engineering.
– Wilson
1 hour ago
Basically, I have no idea about electrical engineering.
– Wilson
1 hour ago
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
2
down vote
As old oil-filled capacitors dry out, the capacitance goes down and the can't pass as much AC current.
This type of motor is called "capacitor run induction motor". In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings.
answered 1 hour ago
Dave Tweed♦
112k9135243
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
As old oil-filled capacitors dry out, the capacitance goes down and the can't pass as much AC current.
This type of motor is called "capacitor run induction motor". In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings.
answered 1 hour ago
Dave Tweed♦
112k9135243
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
add a comment |Â
up vote
2
down vote
As old oil-filled capacitors dry out, the capacitance goes down and the can't pass as much AC current.
This type of motor is called "capacitor run induction motor". In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings.
answered 1 hour ago
Dave Tweed♦
112k9135243
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
add a comment |Â
up vote
2
down vote
up vote
2
down vote
As old oil-filled capacitors dry out, the capacitance goes down and the can't pass as much AC current.
This type of motor is called "capacitor run induction motor". In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings.
answered 1 hour ago
Dave Tweed♦
112k9135243
As old oil-filled capacitors dry out, the capacitance goes down and the can't pass as much AC current.
This type of motor is called "capacitor run induction motor". In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings.
answered 1 hour ago
Dave Tweed♦
112k9135243
answered 1 hour ago
Dave Tweed♦
112k9135243
answered 1 hour ago
Dave Tweed♦
112k9135243
answered 1 hour ago
Dave Tweed♦
112k9135243
112k9135243
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
add a comment |Â
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
Am I correct in assuming that it is a 3 phase motor design but one of the phases have been replaced by a capacitor? Or am I totally off?
– Harry Svensson
54 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
@HarrySvensson: No, it's just two windings and two phases. The second winding is just to create a preferred direction of rotation -- a motor with just a single winding rotates equally well in either direction.
– Dave Tweed♦
44 mins ago
add a comment |Â
Wilson is a new contributor. Be nice, and check out our Code of Conduct.
Wilson is a new contributor. Be nice, and check out our Code of Conduct.
Wilson is a new contributor. Be nice, and check out our Code of Conduct.
Wilson is a new contributor. Be nice, and check out our Code of Conduct.
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Basically, I have no idea about electrical engineering.
– Wilson
1 hour ago