wholesale spur gear motor noise problem
The deceleration system is an important part of electromechanical products. The advantages of micro geared motors provide the highest level of dynamic response and torque density, so the development trend of the drag system is to replace the traditional hydraulic, DC, step and AC with AC deceleration drive. Variable frequency drive to bring system performance to a whole new level, including shorter cycle times, higher productivity, better reliability and longer life. In order to achieve better performance of the micro geared motor, it is necessary to understand some of the characteristics of the micro geared motor, so what are the common problems in the use of the miniature geared motor.
First, noise, instability
When using a micro geared motor on some machines, the noise is too large, and the motor drives the load to run unstable. When this problem occurs, the first reaction of many users is that the quality of the micro gear motor is not good because sometimes it is replaced by Stepper motors or variable frequency motors are used to drag the load, but the noise and instability are much smaller. On the surface, it is indeed the reason of the miniature geared motor, but after we carefully analyze the working principle of the miniature geared motor, we will find that this conclusion is completely wrong.
The AC deceleration system includes: a deceleration drive, a micro gear motor and a feedback sensor (generally a micro gear motor with an optical encoder). All of these components operate in a control closed-loop system: the drive receives parameter information from the outside, and then delivers a certain current to the motor, which is converted into torque-driven load by the motor. The load acts or accelerates and decelerates according to its own characteristics. The sensor measures the load. The position of the drive device compares the set information value with the actual position value, and then the actual position value and the set information value are kept consistent by changing the motor current. When the load suddenly changes to cause a speed change, the digitizer knows this. After the speed changes, it will react to the deceleration drive immediately. The drive will change the current value supplied to the micro gear motor to meet the load change and return to the set speed. The AC deceleration system is a very high-response full-closed system. The time lag response between load fluctuation and speed correction is very fast. At this time, the real response to the system response is the transmission time of the mechanical connection device.
It’s easier to find the root cause of the problem, and then it’s easier to solve it:
(1) increase the mechanical rigidity and reduce the inertia of the system, reducing the response time of the mechanical transmission part;
(2) Reduce the response speed of the deceleration system and reduce the control bandwidth of the deceleration system, such as reducing the gain parameter value of the deceleration system.
Of course, the above is only one of the causes of noise and instability. For different reasons, there are different solutions, such as noise caused by mechanical resonance, resonance suppression, low-pass filtering, etc. in the deceleration, in short, noise And the cause of instability is basically not caused by the micro geared motor itself.
