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Common Specifications for DC Electric Motors

At Romanoff Industries, we are your source for various types of electric motors designed for different investor applications. There are some commonly used specifications that apply with the design of the DC electrical motor. These include:

Horsepower Rating

This rating refers to the nominal work performed by the motor. It may be expressed in watts or horsepower. This rating may also be expressed as a combination of speed and torque. It is also necessary to know if the motor will operate at different load points because overloading or under-loading the motor is not helpful for the motor’s service life

Nominal Voltage

When it comes to DC electric motors, knowing the nominal voltage of the drive motor is important. In addition, it is also important to know if the motor is meant to function beyond the nominal voltage range for any length of time.

Duty cycle

During the operation of a DC motor with a permanent magnet, the current flowing through the windings causes the generation of heat which tends to increase the motor’s temperature. Once the motor arrives at its continuous running load point, within a relatively short period of time the temperature in the motor should stabilize. Using a higher horsepower rated motor instead may be necessary if the temperature does not become stable.

Rated speed

The speed with which the motor is to run for a particular application is something the designer of the motor should know. It is also important to know if the speed of its operation is to change either by increasing or decreasing the load on the motor or by using a speed control to modify the voltage sent to the motor.

Inrush Current

The motor draws upon this current at startup, regardless of whether or not it is under load. The inrush current immediately drops when the speed of the motor increases. However, in some cases, the extremely high current may significantly damage any electronics attached to the motor in addition to motor components. In this scenario, using a current limiter can prevent such damage.

Stall Torque

The stall torque is the maximum quantity of torque produced by a motor when the shaft is not rotating. Please note: If a motor experiences stall conditions for more than just a few seconds, irreparable damage to the motor is the likely result.

Give us a call today at 800.366.8778 or email sales1@romanoffindustries.com to learn about our selection of electric motors and other electrical equipment, such as transformers and gear reducers.