Frequently Asked Questions about Miniature Geared Motors
Many manufacturers are concerned about the common problems of miniature geared motors. Today, we will reveal the common problems of miniature geared motors for you. The function of the micro gear motor is to reduce the speed of the original micro motor and increase its torque. When using R&D products, various small problems may arise. Let us summarize the common problems of micro-geared motors.
Some customers responded that why the service life and parameters of the micro gear motor are different? Various improper methods of using miniature geared motors will greatly shorten the service life of the motor.
1. Frequent startup;
2. Impact loading;
3. Instantaneous reversal of the reverse direction;
4. Long-term continuous operation;
5. Use more than the allowable load of the protruding suspension and exceed the allowable thrust load;
6. Forced rotation of the output shaft;
7. Braking, reverse current, pwm pulse drive and other braking;
8. Exceed the operating temperature range, relative humidity range or special environment;
9. Use voltages other than standard rated specifications;
These factors will shorten the service life of the miniature geared motor and should be avoided as much as possible.
In addition, there is a heating problem of the micro DC geared motor. Heating of micro gear motors (including all motor types) is a very normal phenomenon under normal conditions. The various DC geared motors we see have iron cores and winding coils. If the winding has resistance, energization will cause losses. The magnitude of the loss is proportional to the square of the resistance and current. This is what we often call copper loss. If the current is not a standard DC or sine wave, there are also harmonic losses; the iron core has a hysteretic eddy current effect, which also causes losses in an alternating magnetic field. Its size is related to material, current, frequency and voltage and is called iron damage. Copper damage and iron damage will manifest in the form of heating, affecting the efficiency of the micromotor. Micromotors generally pursue positioning accuracy and torque output, with relatively low efficiency, generally large currents, high harmonic components, and current alternating frequencies that vary with rotational speed. Therefore, micromotors generally have heating conditions, which are more serious than ordinary AC micromotors.
The simple explanation is that, according to physical theory, micromotors convert electrical energy into mechanical energy. So, what is the reasonable range of heating for this miniature geared motor?
The degree of heating of a miniature DC geared motor mainly depends on its internal insulation level. The internal insulation performance is damaged at high temperature (above 130 degrees). Therefore, as long as the inside does not exceed 130 degrees, the micro gear motor will not damage the ring, and the surface temperature will be lower than 90 degrees. Therefore, its surface temperature is normal at 70-80 degrees. The simple temperature measurement method is useful for the spot thermometer, and it can also be roughly judged: touch it for more than 1-2 seconds (the skin is thin and do not use the hand), no more than 60 degrees; you can only touch it with your hand, about 70-80 degrees; drops of water Rapid vaporization, above 90 degrees.
Many customers are concerned that micro geared motors will have adverse effects. In fact, they ignore it. As long as it is not too hot, it will not affect the micromotor and application products. If the fever is severe, it will affect its dynamic response. It is worth noting that some application products do not allow micromotors to overheat, such as medical devices and high-precision test equipment.