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How do you measure RPM of a motor?

Updated: 8/9/2023
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13y ago

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The speedometer and speedometer cable tells the driver how fast the vehicle is going. What's called a Hall-Effect sensor is used. It uses the principle of magnetic inductance. When a magnetic flux passes through coils of wire, voltage is generated. To use this effect, a magnet is placed in the cars differential. The sensor then can tell when the magnet comes around by a spike in voltage. Since there is a constant amount the car moves with each differential rotation, and with the time between voltage spikes, you can easily divide to get the speed. This is why changing your cars tires will affect your speedometer. Your car assumes that car moves a certain amount with each differential rotation. If you have larger tires on, then each differential rotation (and axle rotation) your car moves further, and you'll move faster than indicated.
speedometer
speedometer.
A speedometer or Machmeter.
The instrument that is used to measure speed is called a Speedometer. This may sound obvious, but it is the correct name for the instrument. All motor vehicles by law will have this.

The speed of what? The one that measures the speed of a vehicle is called a speedometer.
The device used to measure the speed of the car is known as speedometer.
Transmission output sensor is usually used as the input sensor for the speedometer, also the braking system uses the wheel speed sensor to determine if a wheel is slowing faster(locking up).
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10y ago
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15y ago

If by 'RPM' you mean 'Revolutions Per Minute,' that would be a 'tachometer.'

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10y ago

A speedometer or Mach-meter is used to measure speed.

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13y ago

With a tachometer.

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Q: How do you measure RPM of a motor?
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