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Why is the air gap between the stator and rotor on a motor kept as small as it is?
Induced motor slip speed stator and slip differenceThis is a question about squirrel-cage induction machine theoryWhy does the stator field rotate at the same speed as the rotor field in a synchronous generator?Electrical Machine Design: Why do open slots are allowed in synchronous machine while they are avoided in Inductio MachineHow does line impedance of a BLDC motor relate to the RPM of its rotor?How is the shaft of a motor fixed in its position?FEMM: Calculating Torque of an Induction Motor using the Air Gap Integral and SlidingBandFrequency of stator current in induction motorsOrientation of magnetic flux in a induction motor?How can an induction motor be “self starting”
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$begingroup$
Between the stator windings and rotor is a small air gap. What would happen if this gap were larger than it is? Surely the magnetic field set up by energizing the stator windings would still cut the rotor and induce an emf across it. So what effect does this air gap have on the performance of the motor?
motor three-phase inductance induction-motor emf
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
$endgroup$
add a comment |
$begingroup$
Between the stator windings and rotor is a small air gap. What would happen if this gap were larger than it is? Surely the magnetic field set up by energizing the stator windings would still cut the rotor and induce an emf across it. So what effect does this air gap have on the performance of the motor?
motor three-phase inductance induction-motor emf
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
$endgroup$
1
$begingroup$
Note that it is not always kept small. Increasing the airgap is a way to reduce armature reaction without having to increase the amount of permanent magnet material. This allows for higher peak torque at the expense of efficiency. Depending on the application this may be an acceptable tradeoff.
$endgroup$
– Jon
9 hours ago
add a comment |
$begingroup$
Between the stator windings and rotor is a small air gap. What would happen if this gap were larger than it is? Surely the magnetic field set up by energizing the stator windings would still cut the rotor and induce an emf across it. So what effect does this air gap have on the performance of the motor?
motor three-phase inductance induction-motor emf
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
$endgroup$
Between the stator windings and rotor is a small air gap. What would happen if this gap were larger than it is? Surely the magnetic field set up by energizing the stator windings would still cut the rotor and induce an emf across it. So what effect does this air gap have on the performance of the motor?
motor three-phase inductance induction-motor emf
motor three-phase inductance induction-motor emf
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
edited 9 hours ago
Charles Cowie
23.2k1 gold badge17 silver badges42 bronze badges
23.2k1 gold badge17 silver badges42 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
asked 10 hours ago
Ph3ngPh3ng
985 bronze badges
985 bronze badges
1
$begingroup$
Note that it is not always kept small. Increasing the airgap is a way to reduce armature reaction without having to increase the amount of permanent magnet material. This allows for higher peak torque at the expense of efficiency. Depending on the application this may be an acceptable tradeoff.
$endgroup$
– Jon
9 hours ago
add a comment |
1
$begingroup$
Note that it is not always kept small. Increasing the airgap is a way to reduce armature reaction without having to increase the amount of permanent magnet material. This allows for higher peak torque at the expense of efficiency. Depending on the application this may be an acceptable tradeoff.
$endgroup$
– Jon
9 hours ago
1
1
$begingroup$
Note that it is not always kept small. Increasing the airgap is a way to reduce armature reaction without having to increase the amount of permanent magnet material. This allows for higher peak torque at the expense of efficiency. Depending on the application this may be an acceptable tradeoff.
$endgroup$
– Jon
9 hours ago
$begingroup$
Note that it is not always kept small. Increasing the airgap is a way to reduce armature reaction without having to increase the amount of permanent magnet material. This allows for higher peak torque at the expense of efficiency. Depending on the application this may be an acceptable tradeoff.
$endgroup$
– Jon
9 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Air has a much higher reluctance (the magnetic equivalent of resistance) than the magnetic materials used in the motor. The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.
Smaller air gaps also minimize leakage flux, which means more of the flux that is produced actually does something, rather than just going through the air and doing nothing to help the motor work.
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
$endgroup$
add a comment |
$begingroup$
Let's say you design a motor to operate at a given field strength. Most of the magnetic path reluctance comes from the air-gap. Therefore the larger the air-gap, the more H field and therefore length of magnetic material you need to establish the field, so the more expensive the motor is to make. The size and weight also go up as the amount of magnetic material.
Some motors seem to have quite a large air-gap. That comes down to cost as well. A small air-gap needs precision machining, which becomes prohibitively expensive for very small gaps. There's an optimum size of gap for any size and target market of motor that minimises the total magnet and machining costs.
Note that although this is saying the same sort of thing as Hearth's answer, it comes from a different direction.
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
$endgroup$
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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votes
active
oldest
votes
$begingroup$
Air has a much higher reluctance (the magnetic equivalent of resistance) than the magnetic materials used in the motor. The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.
Smaller air gaps also minimize leakage flux, which means more of the flux that is produced actually does something, rather than just going through the air and doing nothing to help the motor work.
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
$endgroup$
add a comment |
$begingroup$
Air has a much higher reluctance (the magnetic equivalent of resistance) than the magnetic materials used in the motor. The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.
Smaller air gaps also minimize leakage flux, which means more of the flux that is produced actually does something, rather than just going through the air and doing nothing to help the motor work.
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
$endgroup$
add a comment |
$begingroup$
Air has a much higher reluctance (the magnetic equivalent of resistance) than the magnetic materials used in the motor. The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.
Smaller air gaps also minimize leakage flux, which means more of the flux that is produced actually does something, rather than just going through the air and doing nothing to help the motor work.
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
$endgroup$
Air has a much higher reluctance (the magnetic equivalent of resistance) than the magnetic materials used in the motor. The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.
Smaller air gaps also minimize leakage flux, which means more of the flux that is produced actually does something, rather than just going through the air and doing nothing to help the motor work.
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
answered 10 hours ago
HearthHearth
6,7151 gold badge15 silver badges49 bronze badges
6,7151 gold badge15 silver badges49 bronze badges
add a comment |
add a comment |
$begingroup$
Let's say you design a motor to operate at a given field strength. Most of the magnetic path reluctance comes from the air-gap. Therefore the larger the air-gap, the more H field and therefore length of magnetic material you need to establish the field, so the more expensive the motor is to make. The size and weight also go up as the amount of magnetic material.
Some motors seem to have quite a large air-gap. That comes down to cost as well. A small air-gap needs precision machining, which becomes prohibitively expensive for very small gaps. There's an optimum size of gap for any size and target market of motor that minimises the total magnet and machining costs.
Note that although this is saying the same sort of thing as Hearth's answer, it comes from a different direction.
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
$endgroup$
add a comment |
$begingroup$
Let's say you design a motor to operate at a given field strength. Most of the magnetic path reluctance comes from the air-gap. Therefore the larger the air-gap, the more H field and therefore length of magnetic material you need to establish the field, so the more expensive the motor is to make. The size and weight also go up as the amount of magnetic material.
Some motors seem to have quite a large air-gap. That comes down to cost as well. A small air-gap needs precision machining, which becomes prohibitively expensive for very small gaps. There's an optimum size of gap for any size and target market of motor that minimises the total magnet and machining costs.
Note that although this is saying the same sort of thing as Hearth's answer, it comes from a different direction.
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
$endgroup$
add a comment |
$begingroup$
Let's say you design a motor to operate at a given field strength. Most of the magnetic path reluctance comes from the air-gap. Therefore the larger the air-gap, the more H field and therefore length of magnetic material you need to establish the field, so the more expensive the motor is to make. The size and weight also go up as the amount of magnetic material.
Some motors seem to have quite a large air-gap. That comes down to cost as well. A small air-gap needs precision machining, which becomes prohibitively expensive for very small gaps. There's an optimum size of gap for any size and target market of motor that minimises the total magnet and machining costs.
Note that although this is saying the same sort of thing as Hearth's answer, it comes from a different direction.
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
$endgroup$
Let's say you design a motor to operate at a given field strength. Most of the magnetic path reluctance comes from the air-gap. Therefore the larger the air-gap, the more H field and therefore length of magnetic material you need to establish the field, so the more expensive the motor is to make. The size and weight also go up as the amount of magnetic material.
Some motors seem to have quite a large air-gap. That comes down to cost as well. A small air-gap needs precision machining, which becomes prohibitively expensive for very small gaps. There's an optimum size of gap for any size and target market of motor that minimises the total magnet and machining costs.
Note that although this is saying the same sort of thing as Hearth's answer, it comes from a different direction.
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
answered 8 hours ago
Neil_UKNeil_UK
83.1k2 gold badges85 silver badges191 bronze badges
83.1k2 gold badges85 silver badges191 bronze badges
add a comment |
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$begingroup$
Note that it is not always kept small. Increasing the airgap is a way to reduce armature reaction without having to increase the amount of permanent magnet material. This allows for higher peak torque at the expense of efficiency. Depending on the application this may be an acceptable tradeoff.
$endgroup$
– Jon
9 hours ago