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## How do you find the KE of a motor?

The torque constant and voltage constant are determined during the design phase and are a function of the overall magnetic circuit design. They are always equal when using SI units. For example, if the motor KT = 0.1 Nm/A, then motor KE = **0.1 V/(rad/s)** assuming Nm and V/(rad/s) are the units used.

## What is KT torque constant?

The torque constant, Kt, of a motor is a very useful parameter for sizing and controlling motors showing a linear speed / torque relationship. … Without getting into theoretical detail, Kt is **simply the slope of the torque / current curve of a motor**. The units of the constant are found in torque units per amp.

## Which motor has high starting torque AC or DC?

**Series wound DC motors** are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.

## What is torque current?

Torque current is **the portion of the total current to the motor that is in phase with the output voltage**. … The Power Factor will also improve as it is an expression of the phase angle between the voltage and the current.

## How is motor resistance calculated?

Ohm’s law tells you that current through a wire – even a long wire wound around a motor solenoid – is equal to the voltage divided by the resistance. You can determine the resistance of a motor coil if you know the wire gauge, **the radius of the solenoid and the number of windings**.

## What is voltage constant?

Constant voltage refers **to the ability to fluctuate output current to maintain a set voltage**. Constant voltage can be used for applications where the workpieces do not have flat surfaces, e.g. crossed wires, and where the resistance varies significantly, and for extremely short welds (less than 1 millisecond).