The structure and characteristics of DC motor
Using the typical products of DC micro motor production, good electrical, mechanical properties and consistency.
Due to the volume and the brush commutator limits, the speed of DC motor in general 3000-12000 rpm range, speed increases, the motor working life will significantly reduce.
Precision low noise motor is adopted, with internal pressure sensitive resistance, so as to reduce the electromagnetic interference to the environment.
Motor's working life mainly depends on the brushes and commutator mechanical wear and electrochemical corrosion, at rated load torque and speed conditions, it can continuously work for 300 to 500 hours.
The structure and characteristics of the gear box
The load torque DC gear motor has a direct relationship to the speed, current, speed as the load increases linearly with decreasing, increasing the current is linear. Use specifications, should try to work in the vicinity of the point of maximum efficiency, in order to obtain the ideal performance, service life and stability characteristics.
Usually, the same DC gear motor using environment and micro DC motor, if you have special needs, such as environmental temperature, overload conditions, current limiting, must explain in advance.
Gear box working life is generally more than DC motor's working life, usually can reach 1000 to 3000 hours.
The gear box of the total reduction ratio is generally in the range 1:10 to 1:500. Through the special design, can reach 1:1000 or more, but the large reduction gear box ratio does not allow "upside down", that is not an output gear box shaft as a driving shaft, forcibly overturned.
Because the gear strength limit, when the total transmission is larger, gear motor may not withstand torque, when the load torque can not exceed the maximum permissible load torque. Gear box by a multi-stage gear pairs.
Each stage includes a composed of flaky pinion gear and a pair of mutually meshed gear pair. The first small gear is installed on the output shaft of the motor. The output shaft of the gear box bearing is used, usually oily bearing made of sintered copper or ferrous material.