DongMing Motor is a professional manufacturer of dc motor and dc motor with gearbox, designing.manufacturing and sale of micro dc motor and micro dc gear motor since 2013.
Our products contains two different parts. The first part is dc motor. The second part is gearbox.
Regarding the dc motor, it is the driving part. So the mini dc motor could be under different voltage.
The custom dc motor voltage is 3v, 6v, 12v and 24v. Other special requests for the voltage are also acceptable. Another factor of the brush dc motor is the driving motor speed. If the dc motor speed is too high, this will shorten the motor working life and add extral noise.If the minature dc motor speed is too slow, it can not produce enough torque for the gearbox.
So when choose a brushed dc motor, knowing the working voltage and driving motor speed is very important. On the other hand, while choosing a brush dc motor, the size especially the output shaft length should be clear. Because most clients request the dc motor to assemble togerther with their gearbox, too short or too long shafts would be both unacceptable.
The brushed DC electric motor generates torque directly from DC power supplied to the motor by using internal commutation, stationary magnets (permanent or electromagnets), and rotating electromagnets.
Advantages of a brushed DC motor include low initial cost, high reliability, and simple control of motor speed. Disadvantages are high maintenance and low life-span for high intensity uses. Maintenance involves regularly replacing the carbon brushes and springs which carry the electric current, as well as cleaning or replacing the commutator. These components are necessary for transferring electrical power from outside the motor to the spinning wire windings of the rotor inside the motor.
Brushes are usually made of graphite or carbon, sometimes with added dispersed copper to improve conductivity. In use, the soft brush material wears to fit the diameter of the commutator, and continues to wear. A brush holder has a spring to maintain pressure on the brush as it shortens. For brushes intended to carry more than an ampere or two, a flying lead will be molded into the brush and connected to the motor terminals. Very small brushes may rely on sliding contact with a metal brush holder to carry current into the brush, or may rely on a contact spring pressing on the end of the brush. The brushes in very small, short-lived motors, such as are used in toys, may be made of a folded strip of metal that contacts the commutator.
Another type dc motor is brushless dc motor. Typical brushless DC motors use one or more permanent magnets in the rotor and electromagnets on the motor housing for the stator. A motor controller converts DC to AC. This design is mechanically simpler than that of brushed motors because it eliminates the complication of transferring power from outside the motor to the spinning rotor. The motor controller can sense the rotor's position via Hall effect sensors or similar devices and can precisely control the timing, phase, etc., of the current in the rotor coils to optimize torque, conserve power, regulate speed, and even apply some braking. Advantages of brushless motors include long life span, little or no maintenance, and high efficiency. Disadvantages include high initial cost, and more complicated motor speed controllers.