How to choose a planetary reducer
First, choose the speed ratio of the planetary reducer:
When selecting a planetary reducer, first determine the reduction ratio. After determining the reduction ratio, multiply the rated torque of the servo motor you selected by the reduction ratio. The value obtained is in principle smaller than the rated output torque of the similar reducer provided by the product sample. At the same time, we must also consider the overload capacity of the drive motor and the maximum working torque required in practice. The maximum working torque required is less than 2 times the rated output torque.
Second, choose the size and size of the planetary reducer:
After satisfying the above conditions, please select the reducer with the smallest volume, and the reducer with a small volume is relatively low cost. If you don't have enough space for the motor reducer to be connected in a straight line, you can also choose a corner reducer that turns the torque 90 degrees.
Third, the choice of the accuracy of the choice of planetary reducer (return clearance):
Next, consider the return clearance of the planetary reducer. The smaller the backlash, the higher the accuracy and the higher the cost. The user has to choose a gearbox that meets the accuracy requirements of the series.
Fourth, the problem of considering the service life of the planetary reducer:
Also consider lateral/radial forces and average life. The reducer with large lateral/radial force is highly reliable in installation and use, and it is not easy to cause problems. The actual life can be calculated according to the software given by the manufacturer. Usually the average life is much longer than the life of the servo motor.
5. Other precautions for purchasing planetary reducer:
After satisfying the above specifications, you can select the gearbox with the mounting dimensions, shaft diameter and input flange that fits your motor according to the product catalog. Finally, you also need to consider the weight of the motor you are equipped with. A reducer is only allowed to be matched with a motor that is less than a certain weight. The motor is too heavy, and the output flange of the reducer may be damaged by running for a long time.
In the family of reducers, planetary reducers are widely used in servo, stepping, DC and other transmission systems because of their small size, high transmission efficiency, wide deceleration range and high precision. Under the premise of ensuring precision transmission, it is mainly used to reduce the speed increase torque and reduce the load/motor moment of inertia ratio.
Several key technical parameters to measure the performance of the line reducer are: reduction ratio, average life, rated output torque, return clearance, full load efficiency, noise, lateral/radial force and operating temperature.
Reduction ratio: The ratio of the output speed to the input speed.
Number of stages: The sun gear and the planet wheels around it form an independent gear train. For example, there is only one wheel train in the reducer. We call it “first classâ€. In order to obtain a large reduction ratio, a multi-stage transmission is required, and the reduction ratio is from 3 to 512.
Average life: refers to the continuous working time of the reducer under the rated load and the highest input speed.
Rated output torque: refers to the allowable output torque for long-term operation under rated load. The maximum output torque is twice this value.
Return clearance: The output is fixed, the input rotates clockwise and counterclockwise, so that the output produces ±2% of the rated torque. The input end of the reducer has a slight angular displacement. This angular displacement is the return clearance. The unit is "arc".
Lubrication method: The planetary reducer does not require lubrication during the entire use.
Full load efficiency: refers to the transmission efficiency of the reducer under the maximum load. It is a key indicator for measuring the speed reducer. The reducer with high load efficiency has less heat and good overall performance.
Noise: The unit is decibel (dB) A. This value is measured at an input speed of 3000 rpm without load and one meter distance from the reducer.
Working temperature: refers to the temperature that the reducer can allow under continuous working and periodic working conditions.
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