0:02 let's learn how a speedometer works with
0:16 animation let's identify the
0:20 components dial in yellow
0:28 hairspring spindle
0:31 spindle
0:34 stationary field plate it is in
0:39 red speed cup which is in
0:42 blue magnet which is in
0:45 green now let's see how speedometer
0:48 works so first let's learn the
0:51 arrangement of components a well
0:54 balanced speed cup which is in blue is
0:57 supported by a permanent magnet which is
0:59 in green as you can see there in the
1:03 video video okay there you can see it
1:06 the spindle is linked with the speed cup
1:09 which is in blue so there it can be
1:12 clearly seen the spindle is linked with
1:16 a pointer or a needle at the dial so
1:19 here the spindle is connected with the
1:21 pointer or the needle and the dial the
1:25 magnet gets its drive from the vehicle's
1:28 transmission through a flexible coupling
1:29 so you can see the vehicle trans
1:31 transion is been indicated there and
1:33 there is a connection coming from the
1:36 vehicle transmission towards the magnet
1:39 so the magnet gets its drive from the
1:41 vehicle's transmission so the magnet
1:44 will be rotating at the same speed
1:45 coming from the vehicle transmission
1:48 that means it will rotate in the vehicle
1:51 speed therefore the speed of the
1:53 permanent magnet will be equal to the
1:57 speed of the vehicle right so that's a
2:00 permanent magnet which is in green as as
2:03 the magnet rotates it produces a
2:07 magnetic field which exerts a torque on
2:09 the speed cup which is in blue so here
2:12 you can see as the drive comes from the
2:14 vehicle transmission the magnet starts
2:18 to rotate and as it rotate it creates a
2:20 magnetical field around it and due to
2:23 this magnetic field you can see there's
2:26 a talk generated on the speed Cup and
2:29 the speed Cup starts to rotate right the
2:32 speed cup does not have a mechanical
2:33 connection with the magnet that's very
2:36 important it rotates just because of the
2:38 magnetical field and it does not have a
2:41 mechanical linkage with the magnet now
2:44 let's see the working once more as the
2:46 vehicle moves as I told the magnet
2:48 starts to rotate at the speed
2:51 proportional to the vehicle speed and
2:54 this produces a magnetic field resulting
2:57 in the rotation of the speed cup which
2:59 is in blue as the spindle is connected
3:02 to to the speed cup it also rotates
3:05 resulting in the rotation of the needle
3:09 or the pointer on its top this Needle on
3:11 the top of the spindle indicates the
3:13 vehicle speed you can see in the needle
3:17 moves and it indicates the vehicle speed
3:18 and let's see the function of the
3:20 hairspring over there the function of
3:23 the hairspring is to control and limit
3:26 the movement of the needle and also to
3:28 bring back the needle to zero as the
3:31 vehicle stops you can see the uh spring
3:33 that's the hair spring is getting
3:35 energized as the needle moves and it
3:37 controls and limits the movement which
3:40 indicates the correct speed on the dial
3:42 so this is how simply a speedometer
3:44 works I believe you understand it's
3:46 working in this animation please click
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