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Fan speed switch: why OFF :: HIGH :: MED :: LOW?
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Many fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to shut it off. This has always slightly annoyed me, because it appears to make no logical sense to have to speed the fan up to turn it off.
Why are the speed settings from fastest to slowest? This design seems counter-intuitive, but I assume there is a good reason because the design is so common.
motor switches induction-motor fan
edited 1 hour ago
Charles Cowie
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RichF
28638
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up vote
2
down vote
favorite
Many fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to shut it off. This has always slightly annoyed me, because it appears to make no logical sense to have to speed the fan up to turn it off.
Why are the speed settings from fastest to slowest? This design seems counter-intuitive, but I assume there is a good reason because the design is so common.
motor switches induction-motor fan
edited 1 hour ago
Charles Cowie
18.5k11136
asked 2 hours ago
RichF
28638
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
Many fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to shut it off. This has always slightly annoyed me, because it appears to make no logical sense to have to speed the fan up to turn it off.
Why are the speed settings from fastest to slowest? This design seems counter-intuitive, but I assume there is a good reason because the design is so common.
motor switches induction-motor fan
edited 1 hour ago
Charles Cowie
18.5k11136
asked 2 hours ago
RichF
28638
Many fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to shut it off. This has always slightly annoyed me, because it appears to make no logical sense to have to speed the fan up to turn it off.
Why are the speed settings from fastest to slowest? This design seems counter-intuitive, but I assume there is a good reason because the design is so common.
motor switches induction-motor fan
motor switches induction-motor fan
edited 1 hour ago
Charles Cowie
18.5k11136
asked 2 hours ago
RichF
28638
edited 1 hour ago
Charles Cowie
18.5k11136
asked 2 hours ago
RichF
28638
edited 1 hour ago
Charles Cowie
18.5k11136
edited 1 hour ago
Charles Cowie
18.5k11136
edited 1 hour ago
Charles Cowie
18.5k11136
18.5k11136
asked 2 hours ago
RichF
28638
asked 2 hours ago
RichF
28638
asked 2 hours ago
RichF
28638
28638
add a comment |Â
add a comment |Â
2 Answers
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oldest
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up vote
2
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Fans of that type have induction motors with two windings with a capacitor in series with one of the windings. For every individual motor design there is a certain capacitor value that allows the motor to develop maximum torque and operate the the maximum speed. Smaller capacitor values are used to reduce the torque so that the load overcomes the motor's torque and slows the motor down.
When the motor is turned on, the motor must overcome the static friction of the bearings and get the fan moving. It must then accelerate the motor inertia. That means that using the highest torque setting is desirable for starting the motor. Once the fan is moving, the torque can be reduced for lower speed operation.
answered 1 hour ago
Charles Cowie
18.5k11136
add a comment |Â
up vote
0
down vote
Usually because the design of the switch means that resistor 1 (R1) can be used for high, then R1 + R2 for medium etc
answered 1 hour ago
Solar Mike
1,8691316
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Fans of that type have induction motors with two windings with a capacitor in series with one of the windings. For every individual motor design there is a certain capacitor value that allows the motor to develop maximum torque and operate the the maximum speed. Smaller capacitor values are used to reduce the torque so that the load overcomes the motor's torque and slows the motor down.
When the motor is turned on, the motor must overcome the static friction of the bearings and get the fan moving. It must then accelerate the motor inertia. That means that using the highest torque setting is desirable for starting the motor. Once the fan is moving, the torque can be reduced for lower speed operation.
answered 1 hour ago
Charles Cowie
18.5k11136
add a comment |Â
up vote
2
down vote
Fans of that type have induction motors with two windings with a capacitor in series with one of the windings. For every individual motor design there is a certain capacitor value that allows the motor to develop maximum torque and operate the the maximum speed. Smaller capacitor values are used to reduce the torque so that the load overcomes the motor's torque and slows the motor down.
When the motor is turned on, the motor must overcome the static friction of the bearings and get the fan moving. It must then accelerate the motor inertia. That means that using the highest torque setting is desirable for starting the motor. Once the fan is moving, the torque can be reduced for lower speed operation.
answered 1 hour ago
Charles Cowie
18.5k11136
add a comment |Â
up vote
2
down vote
up vote
2
down vote
Fans of that type have induction motors with two windings with a capacitor in series with one of the windings. For every individual motor design there is a certain capacitor value that allows the motor to develop maximum torque and operate the the maximum speed. Smaller capacitor values are used to reduce the torque so that the load overcomes the motor's torque and slows the motor down.
When the motor is turned on, the motor must overcome the static friction of the bearings and get the fan moving. It must then accelerate the motor inertia. That means that using the highest torque setting is desirable for starting the motor. Once the fan is moving, the torque can be reduced for lower speed operation.
answered 1 hour ago
Charles Cowie
18.5k11136
Fans of that type have induction motors with two windings with a capacitor in series with one of the windings. For every individual motor design there is a certain capacitor value that allows the motor to develop maximum torque and operate the the maximum speed. Smaller capacitor values are used to reduce the torque so that the load overcomes the motor's torque and slows the motor down.
When the motor is turned on, the motor must overcome the static friction of the bearings and get the fan moving. It must then accelerate the motor inertia. That means that using the highest torque setting is desirable for starting the motor. Once the fan is moving, the torque can be reduced for lower speed operation.
answered 1 hour ago
Charles Cowie
18.5k11136
answered 1 hour ago
Charles Cowie
18.5k11136
answered 1 hour ago
Charles Cowie
18.5k11136
answered 1 hour ago
Charles Cowie
18.5k11136
18.5k11136
add a comment |Â
add a comment |Â
up vote
0
down vote
Usually because the design of the switch means that resistor 1 (R1) can be used for high, then R1 + R2 for medium etc
answered 1 hour ago
Solar Mike
1,8691316
add a comment |Â
up vote
0
down vote
Usually because the design of the switch means that resistor 1 (R1) can be used for high, then R1 + R2 for medium etc
answered 1 hour ago
Solar Mike
1,8691316
add a comment |Â
up vote
0
down vote
up vote
0
down vote
Usually because the design of the switch means that resistor 1 (R1) can be used for high, then R1 + R2 for medium etc
answered 1 hour ago
Solar Mike
1,8691316
Usually because the design of the switch means that resistor 1 (R1) can be used for high, then R1 + R2 for medium etc
answered 1 hour ago
Solar Mike
1,8691316
answered 1 hour ago
Solar Mike
1,8691316
answered 1 hour ago
Solar Mike
1,8691316
answered 1 hour ago
Solar Mike
1,8691316
1,8691316
add a comment |Â
add a comment |Â
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