How To Calculate Torque From Rpm And Current

Torque Calculation Formula:

\[ T = \frac{(V \times I \times eff \times 60)}{(2 \times \pi \times RPM)} \]

Voltage (V):

Current (I):

Efficiency (eff):

dimensionless

RPM:

rev/min

Torque (T):

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1. What Is The Torque Calculation Formula?

The torque calculation formula estimates mechanical torque from electrical parameters and rotational speed. It provides an approximate calculation of torque based on voltage, current, efficiency, and RPM.

2. How Does The Calculator Work?

The calculator uses the torque formula:

\[ T = \frac{(V \times I \times eff \times 60)}{(2 \times \pi \times RPM)} \]

Where:

\( T \) — Torque (Nm)
\( V \) — Voltage (V)
\( I \) — Current (A)
\( eff \) — Efficiency (dimensionless)
\( RPM \) — Rotational speed (rev/min)

Explanation: The formula calculates approximate torque by considering electrical power input (V×I), efficiency factor, and converting to mechanical torque using rotational speed.

3. Importance Of Torque Calculation

Details: Accurate torque estimation is crucial for motor selection, mechanical system design, performance analysis, and ensuring proper operation of rotating machinery.

4. Using The Calculator

Tips: Enter voltage in volts, current in amperes, efficiency as a dimensionless value (0-1), and RPM in revolutions per minute. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is this calculation approximate?
A: This calculation provides an estimate as it assumes constant efficiency and doesn't account for all motor losses and non-linearities in the system.

Q2: What is a typical efficiency value for electric motors?
A: Efficiency typically ranges from 0.7 to 0.95 (70-95%) depending on motor type, size, and operating conditions.

Q3: Can this formula be used for all types of motors?
A: This formula provides a general approximation but may need adjustments for specific motor types (DC, AC, brushless, etc.) and operating conditions.

Q4: What are the limitations of this calculation?
A: The calculation assumes steady-state operation, constant efficiency, and doesn't account for starting torque, overload conditions, or temperature effects.

Q5: How accurate is this torque estimation?
A: Accuracy depends on the precision of input values, particularly the efficiency factor. For precise applications, direct torque measurement is recommended.