• DC Micro Motor
• DC Geared Motor
• DC Coreless Motor
• Planetary Gear - product K type
• Planetary Gear - product T type
• Vibration Motor
• PMDC

• Simple design
• Easy to control speed
• Easy to control torque
• Simple, cheap drive design

The design of the brushed DC motor is quite simple. A permanent magnetic field is created in the stator by either Permanent magnets or Electro-magnetic windings.
If the field is created by permanent magnets, the motor is said to be a "permanent magnet DC motor" (PMDC). If created by electromagnetic windings, the motor is often said to be a "shunt wound DC motor" (SWDC). Today, because of cost-effectiveness and reliability, the PMDC motor is the motor of choice for applications involving fractional horsepower DC motors & up to about three horsepower.

At five horsepower and greater, various forms of the shunt wound DC motor are most commonly used. This is because the electromagnetic windings are more cost effective than permanent magnets in this power range.

Opposing the stator field is the armature field, which is generated by a changing electromagnetic flux coming from windings located on the rotor. The magnetic poles of the armature field will attempt to line up with the opposite magnetic poles generated by the stator field. If we stopped the design at this point, the motor would spin until the poles were opposite one another, settle into place, and then stop. To prevent this, the section of the rotor where the electricity enters the rotor windings called the commutator is placed. The electricity is carried between the rotor and the stator by conductive graphite-copper brushes (mounted on the rotor) which contact rings on stator. When power is supplied, the motor rotates towards the pole alignment point. As the motor would get to this point the brushes jump across a gap in the stator rings. Momentum carries the motor forward over this gap. When the brushes get to the other side of the gap, they contact the stator rings again and the polarity of the voltage is reversed in this set of rings. The motor begins accelerating again this time trying to get to the opposite set of poles. The momentum has carried the motor past the original pole alignment point. This continues as the motor rotates.

In most DC motors, several sets of windings or permanent magnets are present to smooth out the motion.

Easy to control speed

Controlling the speed of a brushed DC motor is simple. The higher the armature voltage, the faster the rotation. This relationship is linear to the motor's maximum speed.
The maximum armature voltage which corresponds to a motor's rated speed (these motors are usually given a rated speed and a maximum speed, such as 1750/2000 rpm) are available in certain standard voltages, which roughly increase in conjunction with horsepower. Thus, the smallest industrial motors are rated 90 VDC and 180 VDC. Larger units are rated at 250 VDC and sometimes higher.

Specialty motors for use in mobile applications are rated 1.3 VDC. Other tiny motors may be rated 1.5VDC. Most industrial DC motors will operate reliably over a speed range of about 20:1 -- down to about 5-7% of base speed. This is much better performance than the AC motor. This is partly due to the simplicity of control, but is also partly due to the fact that most industrial DC motors are designed with variable speed operation in mind, and have added heat dissipation features which allow lower operating speeds.