# What are the factors governing selection of motor power rating?

Contents

Factors for selection of motor for electric drives: 1)Type of drive:- individual or group 2)Electrical supply:-whether it is AC or DC, 1 phase or 3 Phase 3) Nature of the load: constant or variable. 4) Speed Requirement: constant speed or variable speed operation.

## What are the factors for selection of an electric motor for any application depends?

When searching to buy an electric motor or gear motor for your application, it is important to consider requirements beyond speed, torque, power and voltage.

## What determines the power of an electric motor?

In an electric motor, the mechanical power is defined as the speed times the torque. … The synchronous speed is the speed of the stator’s magnetic field rotation, calculated as 120 times the line frequency divided by the number of poles in the motor.

## What factors do you think will affect the speed of the electric motor?

Factors Affecting Motor Performance

• Voltage of Power Supply.
• Type of Power Supply.
• Winding Specifications.
• Environmental Temperature.
• Type of Magnet.
• Flux Yoke.
• Phase.

## What makes a good motor?

There are several characteristics that you need pay attention to when selecting a motor but voltage, current, torque, and velocity (RPM) are most important. Current is what powers the motor and too much current will damage the motor. For DC motors, operating and stall current are important.

## What are the 6 parts of an electric motor?

These six components include:

• 1) The Rotor. The rotor is the moving part of your electric motor. …
• 3) The Bearings. The rotor in your electric motor is supported by bearings, which allow it to turn on its axis. …
• 4) The Windings. …
• 5) The Air Gap. …
• 6) The Commutator. …
• What Do All of These Components Have in Common?

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## What is electric motor and its principle?

The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.

## How is motor rating calculated?

Multiply the motor voltage by the full-load current. The result is in watts. Divide watts by 1,000 to give kilowatts. For example, 230 volts x 20 amps = 4,600 watts; 4,600 watts divided by 1000 = 4.6 kilowatts.

## What happens when motor load increases?

As the load is increased, the motor will slow down, and the torque will increase. Current into the motor will also increase. … The peak torque occurs at relatively high speed for efficient motors. Certain applications use less efficient induction motors which are designed to have maximum torque occur at stall speed.

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## How do you find the input power of a motor?

Calculations

1. I = V / R. where I – current, measured in amperes (A); …
2. Pin = I * V. where Pin – input power, measured in watts (W); …
3. Pout = τ * ω where Pout – output power, measured in watts (W); …
4. ω = rpm * 2π / 60. …
5. E = Pout / Pin. …
6. Pout = Pin * E. …
7. τ * ω = I * V * E.
8. τ * rpm * 2π / 60 = I * V * E.

## What is rated speed of motor?

The rated speed is the speed at which the motor will first produce its maximum designed power output, and “maximum speed,” the fastest the motor can spin while producing that same amount of power./:m] ]The reduction ratio should be applied on the RPM while your load is attached to the motor.

## How do you make an electric motor more powerful?

We can increase the turning force (or torque) that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can increase the electric current flowing through the wire, or we can make the coil so it has many “turns” (loops) of very thin wire instead of one “turn” of thick wire.

## How do you specify a motor?

Identify if the motor is single or three phase – this should be detailed on the nameplate with the voltage supplied to the motor. Identify the power rating or kilowatt kW reading. If the power is given in horsepower (hp), multiply by 0.75 to give the power in kilowatts. 