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When we have a project related dc gear motor, we need to figure out how to choose a dc gear motor. Firstly, we need to calculate the project design, the space it leaves for the dc gear motor, including diameter and total length. Secondly, we need to calculate the specification of the dc gear motor: 1.Working voltage: if we confirmed it is a dc power supply. 2.Speed: you do not need to know the driving motor speed. However, the output speed is the mostly important. It could be either free load speed or load speed. 3.Torque: normally we have two ways to decribe the torque of the dc gear motor, the rated torque and the stall torque. The rated torque means the torque it need to drive the object to the estimated position. The stall torque means the motor will be close to stall when the motor reach the torque. Thirdly, through the above knowledge, we can work out different proposals of a dc gear motor. This is also how we choose a dc gear motor for our customers.

For a dc gear motor, it is including two parts, the driving motor and the gearbox. Dc gear motor means the gear motor is working under direct current voltage. For the driving motor part, it could be either brushed dc motor or brushless dc gear motor. The brushed dc motor could be carbon brush or electric brush. The voltage of the dc motor determine the voltage of the dc gear motor. The size and the quantity of the wire determine the driving motor speed. For two different dc motor, even they have the same speed, they might use different wires. For the gearbox part, it could be spur gearbox, planetary gearbox and worm gearbox etc. The size of the gearbox, the gear ratios we choose, or the materials of the gears, all these factors might influence the performance of the dc gear motor. So a dc gear motor is using a gearbox to reduce the speed of the driving motor, however produce higher torque to move the object.

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.