Summary:...
The structure and characteristics of DC motor
Adopt mass-produced micro DC motor typical products, with good electrical and mechanical properties and consistency.
Due to the limitation of the size and the brush commutator of the geared motor, the speed of the DC motor is generally in the range of 3000-12000 rpm. When the speed increases, the working life of the motor will be significantly reduced.
The precision low-noise motor used is equipped with a varistor inside to reduce electromagnetic interference to the environment.
The working life of the
planetary gearmotor mainly depends on the mechanical wear and electrochemical corrosion of the brushes and commutators. Under the rated load torque and speed conditions, it can run continuously for 300 to 500 hours.
The structure and characteristics of the gearbox
The load torque of the DC gear motor has a direct relationship with the speed and current. The speed decreases linearly with the increase of the load, and the current increases linearly. When selecting specifications, try to work near its maximum efficiency point to obtain ideal running performance, working life and characteristic stability.
Usually, the use environment of DC gear motor is the same as that of micro DC motor. If there are special needs, such as ambient temperature, overload conditions, current limit, etc., it must be explained in advance.
The working life of the gearbox generally exceeds the working life of the DC motor, which can usually reach 1000 to 3000 hours.
The total reduction ratio of the gearbox is generally in the range of 1:10 to 1:500. After special design, it can reach 1:1000 or more, but the gearbox with a large reduction ratio is not allowed to "reverse", that is, the output shaft of the gearbox cannot be used as the driving shaft to forcibly reverse.
Due to the limitation of gear strength, when the total transmission is large, the gear motor may not be able to withstand the stall torque, and the load torque at this time cannot exceed the maximum allowable short-time load torque. The gearbox consists of multi-stage gear pairs. Each stage consists of a pair of intermeshing gear pairs consisting of a blade gear and a pinion. The first pinion is mounted on the output shaft of the electric motor. The bearing used for the output shaft of the gear box is usually an oil-impregnated bearing made of copper or iron material sintered
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