Brushed DC Motors

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Brush DC Motors

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Brush DC motors are mechanically commutated motors that are good for high speed applications where responsiveness and small package size is needed. Brush DC motors are easy to drive and cost effective when long life is not required.

Why a Brushed DC Motor?

The brushed DC motor is the classic motor that is used in applications like motorized toys, appliances, and computer peripherals. This type of motor is inexpensive, efficient, and especially useful for providing high speed and power in a relatively small package.

How Does the Brushed DC Work?

This type of DC motor has a split ring device called a commutator around the middle. When DC power is applied, the electromagnetic energy pushes the armature away, causing rotation. When the armature becomes aligned horizontally, the commutator contacts with an electrical “brush”, reversing the polarity and causing it to rotate the other way. This happens again on the other side, resulting in continuous motion.

 

Why Is this Motor “Brushed”?

Electrical contacts on each side of the motor are necessary to reverse the polarity and get the commutator to keep the motor constantly spinning. These contacts are not actually brushes. This type of DC motor is referred to as brushed because early designs of this motor used copper brushes as the contacts. Although in today’s motors the commutator is indeed brushed against the contacts, actual brushes are not used.

Is There a Type of DC Motor Other than Brushed?

If you prefer, you can use a brushless motor for your motor application needs. The advantage to a brushless over the brushed type is that there are no contacts and no commutator, so you don’t have to worry about sparking, noise, or the contacts wearing out like you do if you go with the brushed version. The disadvantage of the brushless motor is that it tends to be considerably more expensive than a brushed motor. Consider, for example, if you are mass-producing a robot toy for children. You’ll probably want a brushed DC motor that allows you to make many units cheaply rather than paying more for brushless motors that will probably outlive the toy itself given the normal wear and tear an average child will put on it.

How Can You Find the Right Brush DC Motor for You?

This part is easy. There are many different types of brush motor and NMB has virtually all of them for you. There are flat, or rectangular, motors for feeding and loading, and round ones that are mainly used for spindles. You can also select a brush motor according to rated load/rotation speed, that is, according to your required torque/speed characteristics. Just use the convenient charts provided in the sections below along with the convenient search bar on this page to find the brush motor that’s perfect for your application, whatever it may be.

Brush DC Motors Engineering

  1. Brush DC Motors Outline
  2. Selection of Brush DC Motors
    1. Selecting by Shape – Rectangular
    2. Selecting by Shape – Round
    3. Selecting by Spindle
    4. Selecting by Feeding, Loading
    5. Selecting by Rated Load / Rotation Speed