The rotational speed of the cam indexer determines the efficiency of the automation system in actual production. How to control the indexer?
We know that the cam indexer itself has no driving function. It can only realize its unique rotation function under the drive of a motor. Therefore, the control of the indexer speed is to effectively control the speed of the driving motor of the indexer. control. The induction device in the automation system completes the information transmission between the indexer and the control system, and controls the fast and slow speed of the motor. The frequency converter speed regulation method is commonly used.
Regarding the adjustment of the motor speed, what is mentioned here is the maximum and minimum range of frequency changes that the motor used by the indexer is guaranteed to be within the "rated power" range. Most indexers use a speed regulator to adjust the speed of the motor. For the motor, there is always an upper limit to the speed of rotation, and the speed adjustment range in use is more low-frequency characteristics. For example, a 50Hz design motor, the speed governor reaches full torque at 0.05Hz, then the speed regulation range is 1:1000, under normal circumstances, the V/F controlled frequency converter we use runs to 0.05Hz When the torque is relatively poor, the adjustment range of 1:1000 cannot be achieved in this way.
The speed regulation method of using the inverter is to change the running frequency of the motor through the inverter, thereby changing the speed of the motor. The frequency of the motor inverter can be set freely, and different output frequencies make the motor have different speeds. This method of using the inverter to change the power frequency for speed regulation has a larger speed regulation range, better stability and smoothness, and harder mechanical characteristics. The use of the indexer is considered from the cost and practical aspects. Most motors use ordinary The geared motor, the use of frequency converter is the most ideal tool in terms of cost, simplicity of design, and realization of operational effects.
The indexer includes motors used by other devices. Below the fundamental frequency, it is a constant torque speed regulation. The speed ranges from 0 to 50 Hz, and the speed can be changed from 0 to 1440 RPM. Speed regulation above the base frequency belongs to the speed regulation of constant power. When the speed is faster, the torque of the motor is smaller. Relatively speaking, the power of the motor is smaller. Therefore, when the indexer is used for speed control, It must be adjusted according to the actual situation of the use of the motor, combined with the demand for production efficiency.
The speed and frequency of the motor used by the cam indexer are proportional. At the same time, the frequency converter of the indexer motor also has the functions of energy saving and motor protection. The inverter increases not the speed, but the torque. This is also a correct statement. Therefore, when adjusting the inverter, try to ensure that the motor is within the rated power range. If the speed is increased unilaterally, it will violate the energy saving of the inverter. The characteristics of this increase the burden on the motor and increase the wear and aging heat. Therefore, such use is not recommended. In an automated system that uses an indexer drive, the speed of the motor is generally set to be constant. Under special circumstances, the inverter of the motor will be adjusted to affect the whole body. After all, the indexer is the main component of the indexer system. One, the change of its speed will affect every station.
