Technical requirements and application of inverter for connecting rod double disc grinding machine

Because the connecting rod double disc grinding machine is widely used in many industries such as automobile and motorcycle, bearing and magnetic data, its grinding products have high precision and high consumption efficiency, so new technical requirements are put forward for its inverter. In order to meet these requirements, it is necessary to choose a vector frequency converter with large low frequency torque, fast dynamic response speed and high stable speed accuracy.

First of all, for the inverter of the connecting rod double disc grinding machine, the low frequency torque is an important technical requirement. At low frequencies (1~10Hz), the inverter needs to be able to output 150% of the rated torque. This is because the connecting rod double disc grinding machine requires greater torque at low speed to ensure grinding quality and efficiency. In order to achieve this requirement, it is necessary to select a vector frequency converter with large torque characteristics, and it is also necessary to set and adjust the parameters of the frequency converter reasonably.

Secondly, the acceleration and deceleration time of the connecting rod double disc grinding machine is usually short, so the frequency converter is required to have rapid acceleration and deceleration performance. Acceleration time mainly depends on the performance guarantee of the inverter, while deceleration time can be achieved by applying brake resistance or brake unit. In order to meet this requirement, it is necessary to select a vector frequency converter with fast dynamic response, and it is also necessary to set and adjust the acceleration and deceleration curve of the frequency converter reasonably.

In addition, for the inverter of the connecting rod double disc grinding machine, it is also necessary to have high-precision speed stability control ability. It is necessary to select a vector frequency converter with high speed stability accuracy, and it is also necessary to set and adjust the speed control parameters of the frequency converter reasonably. In order to achieve high-precision speed control, it is also necessary to respond quickly to the change of output torque according to the change of load to keep the speed of the shaft stable.

Finally, the frequency converter used on the connecting rod double disc grinding machine needs to accept the instructions of the CNC controller. These instructions, including frequency instructions and operation instructions, are derived from the CNC controller. In practical applications, it is necessary to select appropriate channels to receive instructions according to specific requirements. The commonly used channels have two ways of analog quantity setting and multi-segment speed setting, or both ways are used at the same time to achieve more flexible control. For the analog setting mode, the voltage analog setting mode is mainly used, and the current analog setting mode can also be used. The inverter needs to be able to pick up both types of analog signals.