How to determine motor shaft RPM using a tachometer?

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• Thread starter

  Tweaked

• Start date

  Mar 31,

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  Calculation Shaft Speed

The method of calculating the RPM of a motor shaft with a tachometer involves simple arithmetic. When the tachometer was attached to the motor shaft's exterior, an RPM value was obtained. The formula for establishing the shaft RPM is RPMt * dt/ds, producing straightforward and effective results, which users in the conversation appreciated.

• Mar 31,

• #1

Tweaked

I needed to determine my motor shaft's speed but lacked reference materials. Hence, I had to mount the tachometer externally as the motor shaft lacked a center-drilled hole. My findings were:

Tachometer Diameter: 31.5mm
Motor Shaft Diameter: 12mm
Tachometer RPM: rpm

What’s the requisite calculation to find the RPM of the motor shaft?

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• Mar 31,

• #2

cragar

The RPM of the shaft equals rpm, right? Or are you seeking angular velocity?

• Mar 31,

• #3

Filip Larsen

Gold Member

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For contact wheel tachometers, the shaft RPM is calculated by the formula: RPMs = RPMt * dt/ds, where 's' indicates shaft and 't' denotes tachometer. The RPM at the tachometer corresponds effectively to the shaft RPM.

Calculation Method for Motor Shaft RPM

The formula used for calculating motor shaft RPM via a tachometer is:

Motor shaft RPM = (Tachometer RPM) * (Tachometer diameter / Motor shaft diameter).

Applying the provided figures yields:

Motor shaft RPM = (rpm) * (31.5mm/12mm) = calculated RPM.

Keep in mind that the accuracy of this calculation relies on the tachometer's precision and proper calibration. If either aspect is in doubt, the resulting RPM may be inaccurate. It's advisable always to incorporate a center-drilled hole for increased measurement precision.

FAQ: Understanding Motor Shaft RPM Calculation

What constitutes shaft speed calculation?

Shaft speed calculation involves determining the number of revolutions a shaft makes per minute, expressed in RPM.

Why is it essential to calculate shaft speed?

Calculating shaft speed is crucial for engineers and scientists in the creation and assessment of rotating machinery such as engines, turbines, and pumps. It aids in establishing safe and efficient operational speeds.

Key factors in shaft speed calculation?

Key factors include shaft diameter, length, power input, bearing type, and load capacity.

How is shaft speed computed?

To calculate shaft speed, the formula RPM = (60 x Frequency) / Number of Poles is used, where frequency signifies the motor's rotation speed, and the number of poles pertains to motor magnetic poles.

What units are used for measuring shaft speed?

Shaft speed is commonly measured in revolutions per minute (RPM) or rotations per minute (RPS), and in certain contexts, it may also be expressed in radians per second (rad/s) or hertz (Hz).