**Contents**show

## How is torque constant calculated?

The Torque Constant defines the torque-current relationship of a motor and is in Nm/amp. The motor and torque constants are related by the formula **Km = Kt(trap)/sqrt(R)**, where R is the phase-to-phase resistance of the winding.

## What is the unit of torque constant?

The SI units for the torque constant are newton metres per ampere (N. m/A).

## How is motor torque output measured?

A relatively simple method to estimate torque on the output shaft of an electrical motor is **to measure its electrical power input via an electrical power meter**. The meter calculates the power input by measuring the current and voltage in the line driving the motor.

## What is the holding torque?

Holding torque is **a measurement of how much rotating force is required to force a stationary stepper motor shaft out of position**. Holding torque (T) is the product of a motor’s torque constant (KT) and the current (i) applied to the stator windings.

## What is torque sensitivity?

Torque Sensitivity – **the relationship of output torque to the input current of the motor**.

## Are DC motors constant torque?

**DC motors can develop a constant torque over a wide speed range**. For a DC motor : Torque is proportional to armature current – this means controlling torque requires simply controlling the motor DC current – easily achieved with a simple DC drive.

## What is stall torque of a motor?

Stall torque is **the torque produced by a mechanical or electro-mechanical device whose output rotational speed is zero**, whereas torque can be defined as the mechanical work generated by the turning effect produced when force is applied to a rotational axis.

## Which power is mentioned on a nameplate of a motor?

8. Which power is mentioned on a name plate of a motor? Explanation: Name plate of the motor shows **rated values i.e. rated speed, rated current, rated voltage**. It also shows output power available at shaft when all other quantities are set to rated values.

## How do you read a motor torque?

**Multiply the horsepower by 5,252** using a calculator. Using the example figure, multiply 0.6434316 by 5,252 to get 3,379.3027. Divide the answer by the motor’s rated number of rpm to get the measurement of the torque in pound-feet.