# How do you measure the speed of a DC motor?

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## How do you find the speed of a DC motor?

A = number of parallel paths. Z = total no. conductors in armature. Hence, speed of a DC motor is directly proportional to emf of rotation (E) and inversely proportional to flux per pole (φ).

## Which sensor can be used for speed measuring of DC motor?

It is very easy to vary speed of DC motor using arduino. Arduino can generate PWM on its analog output pin and when it is applied to DC motor, its speed varies. So it is very simple and easy task. To measure RPM, opto-interrupt sensor MOC7811 is used.

## How do you calculate the speed of a DC generator?

Number of revolutions per second (speed in RPS) = N/60. Therefore, time for one revolution = dt = 60/N (Seconds) From eq. 1, emf generated per conductor = dΦ/dt = PΦN/60 (Volts) …..

## How do you calculate the number of poles of a motor?

The formula is n = 60 x f /p where n = synchronous speed; f = supply frequency & p = pairs of poles per phase. The actual running speed is the synchronous speed minus the slip speed.

## What is the RPM of dc motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

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## How do you calculate RPM speed?

To do this, use the formula: revolutions per minute = speed in meters per minute / circumference in meters. Following the example, the number of revolutions per minute is equal to: 1,877 / 1.89 = 993 revolutions per minute.