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DC Motors

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A direct current (DC) motor is an electrical machine that transforms electrical energy into mechanical energy by creating a magnetic field powered by a direct current. Read More…

DC Motors Direct current (DC) motors have current flowing in only one direction. DC motors provide adjustable speed and torque and contain a rotor and permanent magnetic field stator.
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Leading Manufacturers

Mankato, MN  |  612-746-7624

At Electric Motor solutions, our goal is to provide the best motors and equipment to meet the needs of your application. Products include linear actuators, electric motors, speed reducers, custom motors, vacuum cleaner motors, AC motors, and more.

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Electric Motor Solutions $$$

Stratham, NH  |  844-338-8114

We manufacture motors, motion control and rotating products for OEMs. The electric motors obtainable through us include AC motors, AC/DC motors, brushless DC motors, stepper motors.

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ElectroCraft, Inc. $$$

Monroe, WI  |  608-325-9161

Since our inception in 1932, Carter Motor manufactures AC universal motors, small motors, DC universal motors, DC permanent magnet motors, DC shunt wound motors and gearmotors, and many others. All of our products are designed and assembled here in the USA. Our team is here to help you determine the best motor to fit your application and to ensure the process is efficient and stress-free. We are ISO 9001:2015 certified.

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Carter Motor Company $$$

Greenville, OH  |  937-548-2525

Ramco Electric Motors produces special electric motors used in military, industrial, and aerospace applications. Supplying OEMs with quality motor products, we build complete motors to custom designs and offer types such as DC brush-type motors, AC induction motors, fractional horse power motors, DC brushless motors, AC motors and motor assemblies. Call today! ISO9001:2000, AS9100:2004 certified.

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Ramco Electric Motors, Inc. $$$

Preston, CT  |  860-889-8476

Piela Electric, Inc.! Specialists in electric motor and pump service, repair, and replacement. You'll never be just a number with us. We blend technical excellence with the personal attention you expect. Serving our customers is our number one priority at Piela Electric, Inc. We make every effort to get you back on-line efficiently by our pick up and delivery policy and we guarantee all of our work for one year.

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Piela Electric, Inc. $$$

Titusville, FL  |  321-268-5500

Rex Engineering manufactures gear motors, AC motors and DC motors. We also specialize in sub-fractional HP motors and design all products to your custom specifications. We are focused on providing excellent customer service, quality workmanship, competitive pricing, and constant design improvements for more reliable and versatile products. Contact us today for more information.

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Rex Engineering Corp. $$$

Taunton, MA  |  650 524 8822

Maxon Precision Motors, Inc., manufactures small, high-quality, precision DC brush and brushless motors used in medical, semiconductor, test and measurement, robotics, and manufacturing applications, among others. These advanced motors range in size from 4 to 90 mm and are available up to 500 watts. maxon also offers an extensive selection of gearheads, encoders, tachometers, and control electronics to complement its family of motors.

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Maxon Precision Motors, Inc. $$$
placeholder image Electric Motor Solutions ElectroCraft, Inc. Carter Motor Company Ramco Electric Motors, Inc. Piela Electric, Inc. Rex Engineering Corp. Maxon Precision Motors, Inc.

What is a DC Motor?

A direct current (DC) motor is an electrical machine that transforms electrical energy into mechanical energy by creating a magnetic field powered by a direct current.

When the DC motor is powered, a magnetic field is created in the stator. The magnetic field attracts and repels magnets on the rotor, which results in the rotor's rotation.

DC Motor Diagram

For the rotor's continuous rotation, the commutator attached to brushes connected to the power source supplies current to the wire winding of the direct current motor.

DC motors are preferred for industrial machinery because of their ability to control their speed with higher precision.

How DC Motors Function

DC motors work based on the idea that mechanical force is produced when a current-carrying conductor is placed in a magnetic field. The direction of this result can be determined using the left-hand rule.

Using a variable supply voltage or changing the strength of the current in the motor's windings, we can control the contained speed over a wide range.

For bigger areas of use, alternating current (AC) is changed into DC because a DC motor's torque and speed characteristics are superior to an AC motor.

Types of DC Motors

DC motors can be differentiated by the connections between the field winding and the armature. This field winding can be connected parallel to the armature or inserted in a series manner.

In some cases, the connection is both. The DC motors can also be differentiated by how the rotor is powered, as they can be brushed or brushless.

Brushed DC Motor

In brushed DC motors, the current is applied by brushes, and the magnetic field is produced by the current sent through the commutator and brushes connected to the rotor.

The brushes are made of carbon, which can be separately excited or self-excited. The contained stator is the enclosure that contains the part of the motor and the magnetic field.

Brushed DC Motor

The winding of the coil on the rotor can be in a series or parallel to form either a shunt wound DC motor or a series wound DC motor. The commutator is the electrical switch that reverses the current between the rotor and the external power source.

This method applies electrical current to the windings and produces a steady, rotating torque by reversing the direction of the current.

Brushless DC Motor

This type of motor contains a permanent magnet rotor and a coil wound stator. Because of this DC motor design, there is no need for brushes.

The advantage of a brushless DC motor is the removal of tear and wear of the brushes since very little heat will result from the rotating magnet.

Brushless DC Motor

Brushless DC motors are more expensive because of their efficiency.

Separately Excited DC Motor

In this type of DC motor, the contained motor has separate electrical supplies for the armature winding and field winding, which are electrically separate from each other.

The functions of the armature current and the field current do not interfere with each other, but the input power is their total sum.

Separately Excited DC Motor

Permanent Magnet DC Motor

This DC motor contains an armature winding but does not contain a field winding. Instead, it has a permanent magnet mounted on the stator core's inner surface to produce the magnetic field.

The armature is regular, and it consists of a commutator and brushes. The permanent magnet DC motor is smaller in size and is less expensive. In their operation, they use rare earth magnets such as samarium cobalt.

Permanent Magnet DC Motor

Applications and Uses of DC Motors

DC motors are used in diesel-electric locomotives. The electrical energy converted by a generator in the diesel-electric locomotive from rotational energy is supplied to DC motors connected to the wheels on the engine.

In use in cranes, it is ideal for the motor to have the ability to hold a full zero speed where mechanical brakes may not be needed. In electric vehicles, brushed DC motors retract and position electrically powered windows.

DC motors are used in pumps because they have variable speed control, high starting torque, good transient response, and a simple control system.

DC Motors Informational Video


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