# How can you identify an electric motor without nameplate?

Contents

## How do I find my motor details without nameplate?

Use a strobe tachometer to determine motor RPM and then set up a generic motor in the database for that RPM. If loading cannot be provided by the operator use the acquired data and RPM to approximate loading. You can view the power factor for a value around 88 to 92 to approximate full load.

## How do you identify an AC motor?

Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).

## What specifications must a motor nameplate list according to NEMA?

Understanding motor’s nameplate

• Voltage.
• Frequency.
• Phase.
• Current.
• Type.
• Power factor.
• kW or Horsepower.

## What is a commutator in a motor?

The commutator assures that the current from the generator always flows in one direction. … On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.

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## How do you read a name plate on a motor?

The RPM listed on the nameplate is the shaft speed for the motor. The speed of the motor is directly related to the frequency of the line voltage and the number of poles in the motor. At 60 Hz, a 4 pole motor will rotate at approximately 1800 RPM (7200/4 poles).

## What is a motor nameplate?

The common language of the motor nameplate enables installers, operators and maintenance personnel to understand and recognize the type of motor and that motor’s requirements quickly and easily. The nameplate defines a motor’s basic mechanical design, electrical performance and dimensional parameters.

## What information is found on an electric motor nameplate?

The nameplate-defined parameters for the motor – such as power factor, efficiency, torque and current – are at rated voltage and frequency. When the motor is used at other voltages than the voltage indicated on the nameplate, its performance will be affected.

## How do you tell the difference between AC and DC motors?

Key Differences Between AC and DC Motor

AC Motor DC Motor
An electrical machine that converts AC electrical energy into mechanical energy. An electrical machine that converts DC electrical energy into Mechanical energy.