Shenzhen Saidu Electronics & Technology Co.,Ltd

* On DC Gear Motor

Gear motor micro motor and gearbox assembly. Users in the selection of micro-motor, they tend to speed because the motor torque is too high or too small to meet demand at this time, selected motor gearbox is the most appropriate and direct the program.
Electronics production race gearbox DC motor of the main selection of the most common DC motor, gear box of diameter ranging from 12 to 60mm, applied voltage 1.5 V to 30 V, power 30 watts less than 1 per minute speed in to a few to 100, torque in a wide range of areas 30kg.cm below.

* DC motor speed calculation

1. Speed n = nm ÷ i (rpm) nm-motor speed, i-the total number of teeth than the gear box.
2. Torque T = Tm × i × ηg ÷ 1000 (kgcm) Tm-motor output torque (gcm), i-the total reduction ratio gearbox, ηg-gear box the total efficiency (%).
3. The overall efficiency of gear box ηg = η1 × η2 × η3 × η4 η1-efficiency first-class pair, η2-efficiency second-class pair, η3-third the efficiency of gear pair ....., pair the efficiency of each level of about 95%.
4. Input power P1 = U × I (W) U-voltage (V), I-current (A).
5. Output power P2 = T × n ÷ 97.5 (W) T-torque (kgcm), n-speed (rpm).
6. DC motor speed overall efficiency η = P2 ÷ P1 × 100 = ηm × ηg (%), ηm-micro-motor efficiency.

* DC motor structure and characteristics of

The use of micro-production of typical DC motor products, has a good electrical, mechanical properties and consistency.
         As the volume and brush, commutator constraints, DC motor speed generally 3000-12000 r / min range, the speed increase, the electrical life of the gradual lowering of the work.
         The use of precision low-noise motor, equipped with internal varistor, in order to reduce electromagnetic interference on the environment.
         Working life motor brush and commutator depends mainly on the mechanical wear and electrochemical corrosion, in the rated load torque and speed conditions, continuous operation can be 300-500 hours.

* Gearbox structure and characteristics of

DC motor speed to the speed of the load torque, the current has a direct bearing on the speed as the load increases linearly, the linear increase in current. Selection of specifications should be in the vicinity of its maximum efficiency in order to achieve an ideal operating performance, stability and characteristics of working life.
Typically, DC speed motor micro-environment and the use of the same DC, if the special needs, such as environmental temperature, overload conditions, such as current limit, we must advance.
Gear box of his working life in general over the working life DC motor, usually can be achieved from 1000 to 3000 hours.
Gear box reduction ratio of the total general in the range of 1:5 to 1:500. Specially designed to meet the 1:1000 or greater, but a large reduction ratio of the gear box does not allow "reverse", that is, not the gearbox output shaft axis as the active force, "reverse."
Gear restrictions as a result of strength, when the total transmission is high, can not afford to slow down motor may stall torque, load torque at this time can not exceed the maximum allowable short-term load torque. Gear box gear pair from the composition of multi-level. At every level from the sheet and pinion gear comprising a pair of mutually meshing gear pair. The first pinion installed on the motor output shaft. Gearbox output shaft bearings used, usually copper or iron with sintered materials made from oil-bearing